Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jmatprotec.2022.117813

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Elsevier BV  

DOI： 10.1016/j.procir.2022.09.109

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Elsevier BV  

DOI： 10.1016/j.procir.2022.09.184

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

<title>Abstract</title>The feasibility of joining laser metal deposited Ti6Al4V sheets using laser beam welding was investigated in this article. The additive manufactured sheets were joined using a 3 kW CW YLS-2000-TR ytterbium laser system. The mechanical properties and microstructure of the welded additive manufactured parts (AM welds) were compared with those of the wrought sheets welded using the same laser process. The welds were characterized and compared in terms of bead geometry, microhardness, tensile strength, fractography, and microstructure. The differences in characteristics are majorly found in the width of the bead and tensile strength. The bead width of AM welds appear wider than the wrought welds, and the wrought welds exhibited higher tensile strength and ductility than the AM welds.

DOI： 10.1038/s41598-022-08122-2

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Other Link： https://www.nature.com/articles/s41598-022-08122-2

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Electrical Machining Engineers  

DOI： 10.2526/ijem.27.22

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s00170-021-08380-w

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Other Link： https://link.springer.com/article/10.1007/s00170-021-08380-w/fulltext.html

Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Japan Society of Mechanical Engineers  

DOI： 10.1299/jsmelem.2021.10.111-080

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI  

Titanium and its alloys, particularly Ti6Al4V, which is widely utilized in the marine and aerospace industries, have played a vital role in different manufacturing industries. An efficient and cost-effective way of joining this metal is by laser welding. The effect of laser power and welding speed on the tensile, microhardness, and microstructure of Ti6Al4V alloy is investigated in this paper. Results show that the microhardness is highest at the fusion zone and reduces towards the base metal. The microstructure at the fusion zone shows a transformed needle-like lamellar alpha phase, with a martensitic alpha' phase observed within the heat affected zone. Results of tensile tests show an improved tensile strength compared to the base metal.

DOI： 10.3390/jcs5090246

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.cirp.2021.04.063

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2526/ijem.26.54

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

DOI： 10.1299/jamdsm.2021jamdsm0052

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DOI： 10.1007/s40684-020-00243-1

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Other Link： https://link.springer.com/article/10.1007/s40684-020-00243-1/fulltext.html

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Elsevier BV  

DOI： 10.1016/j.procir.2020.02.282

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Elsevier BV  

DOI： 10.1016/j.procir.2020.02.280

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In micro machining of monocrystalline diamond by pulsed laser, unique processing characteristics appeared only under a few ten picosecond pulse duration and a certain overlap rate of laser shot. Cracks mostly propagate in parallel direction to top surface of workpiece, although the laser beam axis is perpendicular to the surface. This processed area can keep diamond structure, and its surface roughness is smaller than R-a = 0.2 mu M. New laser micro machining method to keep diamond structure and small surface roughness is proposed. This method can contribute to reduce the polishing process in micro machining of diamond. (C) 2019 Published by Elsevier Ltd on behalf of CIRP.

DOI： 10.1016/j.cirp.2019.04.119

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Electrical Machining Engineers  

<p>Zirconia has been widely applied for cutting tools and biomaterials, since it has superior mechanical properties such as high fracture toughness, bending strength and biocompatibility in ceramics. In order to maintain its surface functions for long-term, further improvement of wear resistance for zirconia has been required. In this study, improvement of wear resistance for zirconia is proposed by large-area electron beam (EB) irradiation. Experimental results show that mean width in roughness curve of zirconia surface increases with increasing the energy density of EB, although the maximum height in surface roughness is almost same as the ground surface. In friction and wear test, coefficient of friction reduces with increasing the energy deinsity of EB since ball material smoothly slides on the EB irradiated zirconia surface. Furthermore, it is made clear that wear resistance of zirconia significantly improves by the EB irradiation under appropriate energy density.</p>

DOI： 10.2526/ijem.24.27

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jmatprotec.2017.11.024

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

DOI： 10.1299/jamdsm.2018jamdsm0100

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Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Electrical Machining Engineers  

DOI： 10.2526/ijem.23.38

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

In large-area electron beam (EB) irradiation method developed recently, high energy density of EB can be obtained without focusing the beam. Therefore, the wide area of material surface can be melted instantly, and high efficient surface finishing is possible. Moreover, surface functions such as corrosion resistance and water repellency of the metal molds were improved by the large-area EB irradiation, since thin resolidified layer was formed on the metal surface. It is expected that thick modified layer is effective to maintain their surface functions for long-term. Therefore, control and prediction of the modified layer thickness are important in order to obtain appropriate modified layer thickness on metals with different material properties. In this study, variations of modified layer thickness on metals with different material property are experimentally investigated. Furthermore, electron behavior during large-area EB irradiation is simulated by using an electron track analysis, and prediction of the modified layer thickness is tried with temperature distributions by using an unsteady heat conduction analysis. Experimental results show that the modified layer thickness increases with increasing energy density. The thickness with high relative permeability is larger than that with low one. Analytical results of the modified layer thickness in unsteady heat conduction analysis show quantitative agreement with experimental ones. Furthermore, the modified layer thickness on the metals with different thermal property and density is also discussed. Then, the modified layer thickness of metals with different material property can be predicted by using our unsteady heat conduction analysis model. (C) 2018 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.procir.2017.12.043

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Fuji Technology Press  

In recent years, one common cure for losses in joint function caused by osteoarthritis or rheumatoid arthritis is replacement with an artificial joint. For this reason, it is necessary to add osteoconductivity to artificial joint component surfaces that make contact with bone, thereby reducing the period of time necessary to fixate the bone tissue and the artificial joint component. With the intent of efficiently machining the joint shape by electrical discharge machining (EDM) and simultaneously formation of a surface with osteoconductivity, this study discusses the possibility of adding osteoconductivity to a titanium EDMed surface.

DOI： 10.20965/ijat.2017.p0869

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

In large-area electron beam (EB) irradiation method, uniformly high energy density can be obtained without focusing the beam. Large-area EB can be used for melting and evaporating metal surface instantly. It was clarified that high efficient surface finishing of metal mold steels, ceramics and cemented carbides was possible by the large-area EB irradiation. Furthermore, the tip of convex shape was often rounded after large-area EB irradiation with remarkable material removal at the tip. This phenomenon is probably caused due to the heat accumulation and electrons concentration at the tip. However, electrons behavior near the workpiece surface during large-area EB irradiation has not yet been clarified. In this study, electron track analysis was conducted in order to clarify electrons behavior during large-area EB irradiation. At first, analytical model of the large-area EB irradiation apparatus was built. Then, the EB diameter on the workpiece surface was experimentally measured with different energy density in order to evaluate the accuracy of our analytical model. The calculated results of EB diameter were in good agreement with the experimental ones. In addition, the electrons concentration phenomenon at the tip of convex shape was clarified by calculating energy density distribution on the surface obtained with electron track analysis. The analytical results indicated that the energy density increased from edge to tip of convex shape, while the energy density was constant in the case of planar shape. Experimented results also showed that removal thickness increases with high relative permeability. These results were similar tendency to the energy density distribution. Therefore, electrons concentration on the tip could be simulated by the electron track analysis.

DOI： 10.4028/www.scientific.net/kem.749.118

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

In laser processing of silver nanowire transparent conductive film covered with an acrylic resin layer, effects of pulse duration on electrical insulation and surface quality were experimentally investigated by using nanosecond pulsed laser. The minimum laser fluence to achieve the stable electrical insulation by removal of silver nanowire became small with decreasing the pulse duration, but shorter pulse duration showed drastic change of removal trace area of silver nanowires at the boundary region of laser fluence to change conductive state to insulation one. In contrast, longer pulse duration around 200 ns indicated almost constant small removal trace area of silver nanowires, and wide processing window to perform the stable electrical insulation with small removal trace area of silver nanowires can be expected by using a proper long pulse duration in nanosecond pulsed laser processing. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmatprotec.2016.10.004

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

In large-area electron beam (EB) irradiation method, corner tip of workpiece is generally rounded since removal of material at the tip is done preferentially. Investigation of the shape change is necessary to clarify rounding phenomenon with irradiation of EB. In this study, the shape changes of corner tips were experimentally investigated by Scanning Electron Microscope (SEM) observation of the cross sections. Then, electron track analysis in the EB irradiation was conducted to clarify an electron concentration at the tip. Unsteady heat conduction analysis at the tip was also done with considering the EB concentration at the tip and an electron penetration effect into the surface. The shape changes were estimated by simulation of temperature distribution at the tips. Experimental results show that the curvature radius increases with shot number of EB. The estimated shape changes show quantitatively good agreement with the experimental ones. These results indicate that the rounding phenomenon at the tips by large area EB irradiation can be predicted by our electron track and unsteady heat conduction analysis model. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.ijmachtools.2016.08.002

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER HEIDELBERG  

A new method of periodic nanostructure formation on a polyethylene terephthalate (PET) surface has been developed, employing a femtosecond laser with a wavelength of 1045 nm. To generate structured films, the PET was placed in contact with a silicon (Si) wafer, followed by irradiation with the laser focused on the Si wafer, passing through the PET film. In order to evaluate the surface morphology, atomic force microscopy analysis was conducted on both treated and untreated PET surfaces. From the results, nanostructures with a period of 600 nm and height of 100 nm were formed on the PET film surface by laser treatment. A cell cultivation test was carried out on PET films with and without periodic nanostructures, showing that for nanostructured films, the cells (MG-63) were spread along the periodic grooves; in contrast, random cell spreading was observed for cultures grown on the untreated PET film.

DOI： 10.1007/s00339-016-9716-4

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Electrical Machining Engineers  

Recently, many surfacing processes, such as coating have been widely applied to the industrial products in order to improve the surface functions. One of the practical surfacing processes is a sputter deposition, in which the sputtered target material is deposited on the substrate surface. This method can be used not only for metals but also for insulators and plastics materials as substrate surface. In this study, the possibility of sputter deposition by using a large-area electron beam was discussed. If the target material deposits on the substrate surface simultaneously with the surface melting and resolidification of substrate material by large-area EB, the adhesion between the deposited film and the substrate surface would be strong. Alloy tool steel SKD11 was used as a substrate material, and pure metal tube made of nickel or titanium were used as a target material. Then, the substrate surface after EB irradiation was analyzed and the surface characteristics were investigated.

DOI： 10.2526/ijem.21.7

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Titanium (Ti) is an important biomaterial. We have used femtosecond laser irradiation to form periodic nanostructures on Ti plate for control of the cell spreading. In this study, periodic nanostructures with periodicities of 200, 300 and 600 nm were formed on a Ti plates using a femtosecond laser with wavelengths of 258, 388 and 775 nm, respectively. Cell spreading on the Ti plate for periodic nanostructures with periodicity of 200 nm lacked a definite direction, whereas cell spreadings on the Ti plate for periodic nanostructures with periodicities of 300 and 600 nm occurred along the grooves.

DOI： 10.1007/s00339-016-9626-5

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Pure Titanium (Ti) and Ti alloys are the most used biomaterials. However, they have problem for bioactivity because metals have no biofunction. Therefore, adding new function to Ti and Ti alloys are necessary. One method to add new function is the creation of periodic structures on the biomaterial surfaces, which can control cell spreading. Femtosecond laser is one of the useful tools for creating periodic nanostructures, which can be created on metals and semiconductors by self-organizing in the laser focusing spot. In our previous study, the nanostructures could be formed on the Ti plate by using the femtosecond laser with fundamental wavelength of 775 nm. The periodicities of the nanostructures on the Ti plate was approximately 590 nm, which was shorter than the laser wavelength. Cells tests indicated that cell spreading clearly occurs along the grooves of the nanostructures. However, the influence of the periods of the nanostructure on cell spreading has not yet been investigated. It is expected that the periods can be varied by changing laser parameters, such as pulse widths, laser wavelengths, laser fluences, and number of shots. In this study, the periodic nanostructures are created on the Ti plate surface by using the femtosecond laser with fundamental wavelength of 790 nm. Then, influence of the pulse width and number of shots on the periods is investigated. In the experiments, laser beam is focused and scanned on the Ti plate surfaces. The laser irradiated areas are analysed by using a scanning electron microscope (SEM).

DOI： 10.1016/j.procir.2016.02.188

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Processing characteristics of transparent conductive film containing silver nanowires by ns pulsed fiber lasers with various pulse duration were experimentally investigated in the view-points of insulating state and surface quality. The laser fluence achieving the insulation state became smaller with decreasing the pulse duration. Appearance of removed trace area of silver nanowires was varied by the pulse duration, and the removal area ratio of removed trace area to the whole one was evaluated to discuss the surface quality. Small removal area ratio and good insulation state could be performed at a wide processing window at long pulse duration of 200ns. (C) 2016 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.procir.2016.02.189

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The applications of hierarchical micro/nano-structures, which possess properties of two-scale roughness, have been studied in various fields. In this study, hierarchical periodic micro/nano-structures were fabricated on nitinol, an equiatomic Ni-Ti alloy, using a femtosecond laser for the surface modification of intravascular stents. By controlling the laser licence, two types of surfaces were developed: periodic nano- and micro/nanostructures. Evaluation of water contact angles indicated that the nano-surface was hydrophilic and the micro/ nano-surface was hydrophobic. Endothelial cells aligned along the nano-structures on both surfaces, whereas platelets failed to adhere to the micro/nano-surface. Decorrelation between the responses of the two cell types and the results of water contact angle analysis were a result of the pinning effect. This is the first study to show the applicability of hierarchical periodic micro/nano-structures for surface modification of nitinol. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.msec.2015.07.028

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Although titanium (Ti) is a common biomaterial, controlling cell spreading by forming periodic structures using a femtosecond laser should improve its biocompatibility. Herein we investigate the influence of periodic nanostructures formed on the surface of a Ti plate on cell spreading. Nanostructures with a periodicity of 590 nm are formed using a femtosecond laser with a wavelength of 775 nm. Cell spreading on the plate without period structures lacks a definite direction, whereas cell spreading on the Ti plate with periodic structures occurs along the grooves, suggesting that forming periodic structures via a femtosecond laser can control cell spreading.

DOI： 10.1007/s00340-015-6082-4

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan (IEE Japan)  

DOI： 10.1541/ieejfms.135.587

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPAN LASER PROCESSING SOC  

Titanium dioxide (TiO2) film has photocatalytic properties and good biocompatibility. To expand the film application, formation of oxygen deficiencies in the film was one of the useful methods. Electrical resistance of the film can be decreased due to oxygen deficiencies formation. The local heating process in vacuum is a useful method to create the oxygen deficiencies in local area of the film. Electrical resistance might be locally decreased by local heating with a CW fiber laser. In our experiment, the films were irradiated with the laser in vacuum. Control of temperature on the film was very important for reducing the electrical resistance. Therefore, temperature monitoring of the laser focusing spot area on the film was performed. Temperature of the laser focusing spot area was increased as the laser intensity was increased. Then, the electrical resistance of the laser focusing spot area was decreased as the laser intensity was increased. Thus, electrical resistance of the laser focusing spot area was decreased as temperature of the laser focusing spot area was increased. These results indicated that electrical resistance of the laser focusing spot area was controlled by changing temperature on the laser focusing spot area.

DOI： 10.2961/jlmn.2014.03.0004

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A rewriting process was developed for reduced electrical resistance lines on a titanium dioxide (TiO2) film with femtosecond and CW fiber lasers. In this process, lines are written on TiO2 film by femtosecond laser irradiation, where the lines have a lower electrical resistance than the surrounding film. By heating with a CW fiber laser in air, the low electrical resistance lines are erased and their electrical resistances increase. When the erased areas on the TiO2 film are irradiated with the femtosecond laser, the lower electrical resistance lines can be rewritten on the film surface. (C) 2014 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apsusc.2014.06.062

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：OPTICAL SOC AMER  

Titanium dioxide (TiO2) film is an important biomaterial used to improve the biocompatibility of titanium (Ti). We have used a film coating method with an aerosol beam and femtosecond laser irradiation to form periodic structures on biomaterials for control of the cell spreading. The control of cell spreading on biomaterials is important for the development of advanced biomaterials. In this study, nanostructures with periods of 130 and 230 nm were formed on a film using a femtosecond laser with wavelengths of 388 and 775 nm, respectively. The nanostructure period on the film was 30% of the laser wavelengths. Periods produced with wavelengths of 388 and 775 nm were calculated using a surface plasmon polariton (SPP) model and the experimental results for both wavelengths were in the range of the calculated periods, which suggests that the mechanism for the formation of the periodic nanostructures on the film with a femtosecond laser was due to the excitation of SPPs. (C)2014 Optical Society of America

DOI： 10.1364/OE.22.014696

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Titanium (Ti) is widely used in biomaterials because of its excellent anti-corrosion properties and high strength. However, Ti has no biological function, so its bioactivity must be improved. Coating a titanium dioxide (TiO2) film on a Ti plate surface has been shown to improve the biocompatibility of Ti plates. If periodic nanostructures were formed on the film surface, the direction of cell spreading might be controlled by the direction of the grooves. Controlling cell spreading on biomaterials would contribute to the creation of advanced biomaterials. In this paper, a TiO2 film was formed on a Ti plate with an aerosol beam composed of sub micron-sized TiO2 particles and helium gas. Periodic nanostructures, lying perpendicular to the laser electric field polarization vector, were formed on the film by scanning the femtosecond laser focusing spot. The period and height of the periodic nanostructures were about 230 nm and 150 nm, respectively. In a cell test, cell spreading was observed along the grooves of the periodic nanostructures; in contrast, cell spreading did not show a definite direction on TiO2 a film without periodic nanostructures. These results suggest that the direction of cell spreading on the film can be controlled by periodic nanostructure formation generated using a femtosecond laser. (C) 2013 Elsevier B. V. All rights reserved.

DOI： 10.1016/j.apsusc.2013.10.090

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Titanium dioxide (TiO2) is a functional ceramic with unique photoconductive and photocatalytic properties. In our previous study, a TiO2 film was formed by aerosol beam irradiation. The films were darkened by femtosecond laser irradiation in air. Then electrical resistance of the darkened area on the film decreased. The heating process is also a useful method to vary the TiO2 film property. Local heating can be performed by using a continuous wave (CW) fiber laser. In this study, the film was irradiated with a commercial CW fiber laser in vacuum. Laser irradiated area on the film was also darkened after CW fiber laser irradiation. The electrical resistance of the darkened area on the films was decreased as laser fluence was increased. Electrical resistance of the darkened area after CW fiber laser irradiation in vacuum was much smaller than that after femtosecond laser irradiation.

DOI： 10.1007/s00339-012-7182-1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Titanium dioxide (TiO2) films were irradiated with a femtosecond laser to alter their photoconductive properties. The laser wavelength and pulse duration were 775 nm and 150 fs, respectively. The TiO2 films irradiated with the femtosecond laser were darkened without changing the topography of the TiO2 film surface. The electrical resistances of the films as a function of time were measured under visible-light illumination. The transient electrical resistances decreased as time was increased after turning on the light. There were two stages in the reduction process of the electrical resistance.

DOI： 10.1007/s00339-012-7185-y

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Sumart Processing Society for Minerals, Environment and Energy  

DOI： 10.7791/jhts.37.311

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPAN LASER PROCESSING SOC  

Rewriting process of lower electrical resistance lines on a titanium dioxide (TiO2) film was developed. In this process, lower electrical resistance lines were written on a TiO2 film without producing their surface topography changes by femtosecond laser irradiation. By heating with an electrical furnace under air, the electrical resistance of these lines was come back to the higher resistance with no topography changes. This result indicated that the lines could be erased by the heating method under air. When the erasing-treated area was irradiated with a femtosecond laser, the lower electrical resistance lines could be rewritten with no topography changes of the film surface. DOI: 10.2961/jlmn.2011.02.0012

DOI： 10.2961/jlmn.2011.02.0012

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Laser Society of Japan  

DOI： 10.2184/lsj.39.347

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CERAMIC SOC  

Various types of microstructures are formed on material surfaces by femtosecond laser irradiation. The formation conditions depend on the laser irradiation conditions, the materials, and so on. In this study, microstructures formed on stainless steel by femtosecond laser irradiation were investigated. The laser fluence and the number of irradiated laser pulses were changed to explore the microstructure formation conditions. Different types of periodic structures were found to be formed depending on the laser fluence and the number of irradiated laser pulses.

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Bulk metallic glasses (BMGs) are the subject of important research in materials science and processing. Ti-based BMGs are expected to be utilized as new biomaterials because they have high strength, low Young's modulus and excellent corrosion resistance. Bioactivity might depend on developing a microstructure on the surface of the BMG A femtosecond laser is a good tool for forming a surface microstructure. Ti-Zr-Cu-Pd bulk alloys were irradiated with femtosecond lasers. After the irradiation, the BMGs were treated using a hydrothermal electrochemical method. The results of soaking BMGs in simulated body fluid suggest that the BMGs with a surface microstructure have better bioactivity than the BMGs without.

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Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：Japan Society for Precision Engineering  

DOI： 10.2493/jjspe.81.726

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DOI： 10.1299/jsmelem.2015.8._1102-1_

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DOI： 10.4028/www.scientific.net/MSF.783-786.1377

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CiNii Article

CiNii Books

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Titanium dioxide (TiO2) has a variety of functions, but cannot be activated by visible-light illumination. It is importance to extend the activity of TiO2 into the visible-light, which comprises the larger portion of the room light. Therefore, the visible-light activated TiO 2 is required. We developed it with the femtosecond laser irradiation. The TiO2 films irradiated with femtosecond laser were darkened without changing topography of the TiO2 film surface. In the visible-light photocataltic function measurements, the TiO2 films were evaluated with the acetaldehyde decomposition test. The concentration of acetaldehyde was decreased to over time. This result indicated that visible-light activated photocatalyst function of TiO2 films were generated by femtosecond laser irradiation. © 2013 Copyright SPIE.

DOI： 10.1117/12.2005724

Scopus

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Language：English   Publisher：SPIE-INT SOC OPTICAL ENGINEERING  

Periodic nanostructures formation on Titanium dioxide (TiO2) film by scanning of femtosecond laser beam spot at fundamental and second harmonic wave is reported. Titanium (Ti) is one of the most widely used for biomaterials, because of its excellent anti-corrosion and high mechanical properties. However, Ti implant is typically artificial materials and has no biofunction. Hence, it is necessary for improving the bioactivity of Ti. Recently, coating of TiO2 film on Ti plate surface is useful methods to improve biocompatibility of Ti plate. Then, if periodic nanostructures were formed on the film surface, cell spreading might be controlled at one direction. We propose periodic nanostructures formation on TiO2 film by femtosecond laser irradiation. Cell spread could be controlled along the grooves of periodic nanostructures. In the experiments, the film was formed on Ti plate with an aerosol beam. A commercial femtosecond Ti : sapphire laser system was employed in our experiments. Periodic nanostructures, lying perpendicular to the laser electric field polarization vector, were formed on the film at fundamental and second harmonic wave. Periodic nanostructures were also produced on Ti plate with femtosecond laser. The period of periodic nanostructures on the film was much shorter than that on Ti plate. By cell test, there was a region of cell spreading along the grooves of periodic nanostructures on the film formed with femtosecond laser at fundamental wave. On bare film surface, cell spreading was observed at all direction. These results suggest that direction of cell spread could be controlled by periodic nanostructures formation on the film.

DOI： 10.1117/12.2005706

Web of Science

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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The surface of Ti-based bulk metallic glass (BMG) was irradiated by the femto-second laser and microgrooves were formed on the surface. The titanate nanomesh layers were fabricated on the micro-grooved BMG surface by hydrothermal-electrochemical (H-E) treatment changing the conditions of the concentration of electrolyte solution (0 and 5 M) and applying current density (0-200 mA/cm 2). The bone-inducing capacity of the samples with different H-E treatment was confirmed by soaking them in a simulated body fluid for 12 days. The H-E treatment in higher concentration 5 M NaOH aq. and applying higher current density above 0.5 mA/cm 2 exhibited excellent bioactivity inducing large hydroxyapatite crystallites. © 2011 Materials Research Society.

DOI： 10.1557/opl.2011.673

Scopus

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Event date： 2022.11.24 - 2022.11.25

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2022.10.7 - 2022.10.8

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Event date： 2022.3.15 - 2022.3.17

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Event date： 2022.3.15 - 2022.3.17

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Event date： 2021.9.21 - 2021.9.27

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Event date： 2021.3.5

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Venue：オンライン開催  

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Event date： 2021.3.4

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Venue：オンライン開催  

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Event date： 2021.3.4

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Venue：オンライン開催  

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Event date： 2020.11.19 - 2020.11.20

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Venue：オンライン開催  

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Event date： 2020.11.19 - 2020.11.20

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催  

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Event date： 2020.10.16

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Venue：オンライン開催  

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Event date： 2020.9.4 - 2020.9.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催  

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Event date： 2020.3.5

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Venue：広島大学東広島キャンパス工学部，広島県  

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Event date： 2020.3.5

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Venue：広島大学東広島キャンパス工学部，広島県  

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Event date： 2019.12.14

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：佐世保工業高等専門学校，長崎県  

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Event date： 2019.11.21 - 2019.11.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢大学サテライトプラザ，石川県  

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Event date： 2019.11.21 - 2019.11.22

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Venue：金沢大学サテライトプラザ，石川県  

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Event date： 2019.11.2 - 2019.11.4

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Venue：九州大学 伊都キャンパス  

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Event date： 2019.10.4 - 2019.10.6

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Venue：熊本大学 黒髪南地区，熊本県  

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Event date： 2019.5.24

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Venue：大阪産業創造館，大阪府  

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Event date： 2019.5.24

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Venue：大阪産業創造館，大阪府  

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Event date： 2019.3.20 - 2019.3.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京電機大学 千住キャンパス，東京都  

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Event date： 2019.3.13 - 2019.3.15

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京電機大学 千住キャンパス，東京都  

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Event date： 2019.3.13 - 2019.3.15

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京電機大学 千住キャンパス，東京都  

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Event date： 2018.12.17

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Venue：Tobata Campus, Kyushu Institute of Technology  

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Event date： 2018.11.29 - 2018.11.30

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Venue：大阪大学会館，大阪府  

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Event date： 2018.11.29 - 2018.11.30

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Venue：大阪大学会館，大阪府  

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Event date： 2018.11.29 - 2018.11.30

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Venue：大阪大学会館，大阪府  

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Event date： 2018.10.27

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Venue：高松センタービル，香川県  

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Event date： 2018.10.27

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Venue：高松センタービル，香川県  

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Event date： 2018.10.13 - 2018.10.14

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Venue：兵庫県立大学 姫路環境人間キャンパス，兵庫県  

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Event date： 2018.10.13 - 2018.10.14

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Venue：兵庫県立大学 姫路環境人間キャンパス，兵庫県  

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Event date： 2018.9.5 - 2018.9.7

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Venue：函館アリーナ，北海道  

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Event date： 2018.9.5 - 2018.9.7

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Venue：函館アリーナ，北海道  

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Event date： 2018.3.30

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Venue：大阪大学 中之島センター，大阪府  

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Event date： 2018.3.15 - 2018.3.17

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Venue：中央大学後楽園キャンパス，東京都  

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Event date： 2018.3.15 - 2018.3.17

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Venue：中央大学後楽園キャンパス，東京都  

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Event date： 2018.3.15 - 2018.3.17

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Venue：中央大学後楽園キャンパス，東京都  

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Event date： 2018.3.7

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Venue：徳島大学 理工学部，徳島県  

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Event date： 2018.3.7

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Venue：徳島大学 理工学部，徳島県  

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Event date： 2018.3.6

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Venue：徳島大学 理工学部，徳島県  

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Event date： 2018.3.6

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Venue：徳島大学 理工学部，徳島県  

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Event date： 2018.3.6

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Venue：徳島大学 理工学部，徳島県  

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Event date： 2018.1

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Venue：京都市勧業館みやこめっせ，京都府  

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Event date： 2017.11.29 - 2017.12.1

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Venue：山梨県立図書館イベントスペース，山梨県  

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Event date： 2017.11.25

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Venue：米子コンベンションセンター，鳥取県  

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Event date： 2017.11.25

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Venue：米子コンベンションセンター，鳥取県  

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Event date： 2017.11.25

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Venue：米子コンベンションセンター，鳥取県  

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Event date： 2017.11.13 - 2017.11.17

Language：English   Presentation type：Oral presentation (general)  

Venue：International Conference Center Hiroshima in Peace Memorial Park, Hiroshima  

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Event date： 2017.9.20 - 2017.9.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学豊中キャンパス，大阪府  

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Event date： 2017.9.20 - 2017.9.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学豊中キャンパス，大阪府  

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Event date： 2017.9.20 - 2017.9.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学豊中キャンパス，大阪府  

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Event date： 2017.9.20 - 2017.9.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学豊中キャンパス，大阪府  

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Event date： 2017.7.28

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Venue：岡山大学創立五十周年記念館 2階 大会議室  

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Event date： 2017.6.5 - 2017.6.8

Language：English   Presentation type：Oral presentation (general)  

Venue：富山国際会議場（Toyama International Conference Center）  

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Event date： 2017.3.13 - 2017.3.15

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：慶應義塾大学，東京都  

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Event date： 2017.3.6 - 2017.3.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学，広島県  

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Event date： 2017.3.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学，広島県  

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Event date： 2017.1.7 - 2017.1.9

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Venue：徳島大学 常三島キャンパス，徳島県  

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Event date： 2017.1.7 - 2017.1.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京医科歯科大学生体材料工学研究所，東京都  

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Event date： 2016.12.24

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：近畿大学，広島県  

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Event date： 2016.12.12 - 2016.12.13

Language：Japanese   Presentation type：Poster presentation  

Venue：岡山大学，岡山県  

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Event date： 2016.12.12 - 2016.12.13

Language：Japanese   Presentation type：Poster presentation  

Venue：岡山大学，岡山県  

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Event date： 2016.12.12 - 2016.12.13

Language：Japanese   Presentation type：Poster presentation  

Venue：岡山大学，岡山県  

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Event date： 2016.11.26

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Venue：大島商船高専，山口県  

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Event date： 2016.11.26

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Venue：大島商船高専，山口県  

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Event date： 2016.11.26

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Venue：大島商船高専，山口県  

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Event date： 2016.10.22 - 2016.10.23

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Venue：名古屋大学，愛媛県  

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Event date： 2016.10.22 - 2016.10.23

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Venue：名古屋大学，愛媛県  

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Event date： 2016.10.16 - 2016.10.20

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：San Diego, CA, USA  

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Event date： 2016.10.16 - 2016.10.20

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Venue：San Diego, CA, USA  

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Event date： 2016.9.6 - 2016.9.8

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Venue：茨城大学，茨城県  

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Event date： 2016.6.9 - 2016.6.10

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2016.5.30 - 2016.6.3

Language：English   Presentation type：Poster presentation  

Venue：East Midlands Conference Centre, Beeston Lane, Nottingham, UK  

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Event date： 2016.5.17 - 2016.5.19

Language：English   Presentation type：Poster presentation  

Venue：Pacifico Yokohama, Yokohama, Japan  

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Event date： 2016.5.17 - 2016.5.19

Language：English   Presentation type：Poster presentation  

Venue：Pacifico Yokohama, Yokohama, Japan  

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Event date： 2016.5.17 - 2016.5.19

Language：English   Presentation type：Oral presentation (general)  

Venue：Pacifico Yokohama, Yokohama, Japan  

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Event date： 2016.4.19 - 2016.4.22

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Venue：Tokyo University, Tokyo, Japan  

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Event date： 2016.3.15 - 2016.3.17

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2016.3.9

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Venue：愛媛大学工学部，愛媛県  

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Event date： 2016.3.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学工学部，愛媛県  

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Event date： 2016.3.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学工学部，愛媛県  

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Event date： 2016.3.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学工学部，愛媛県  

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Event date： 2016.1.19 - 2016.1.20

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：三菱電機株式会社 名古屋製作所 ＦＡコミュニケーションセンター，愛知  

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Event date： 2016

Language：English   Presentation type：Oral presentation (invited, special)  

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Event date： 2016

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2015.11.28

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Venue：高知工科大学，高知  

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Event date： 2015.11.28

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：高知工科大学，高知  

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Event date： 2015.11.1 - 2015.11.6

Language：English   Presentation type：Poster presentation  

Venue：Hyatt Regency Austin, Austin, Texas, USA  

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Event date： 2015.10.18 - 2015.10.22

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto Reserch Park, Kyoto  

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Event date： 2015.10.18 - 2015.10.22

Language：English   Presentation type：Oral presentation (general)  

Venue：Atlanta, GA USA  

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Event date： 2015.9.4 - 2015.9.6

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Venue：東北大学, 仙台, 宮城  

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Event date： 2015.9.4 - 2015.9.6

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Venue：東北大学, 仙台, 宮城  

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Event date： 2015.9

Language：Japanese  

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Event date： 2015.7.17

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2015.5.26 - 2015.5.29

Language：English   Presentation type：Poster presentation  

Venue：Kokura, Fukuoka  

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Event date： 2015.3.16

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：産業技術総合研究所 つくば中央第5事業所，茨城県  

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Event date： 2015.3.2

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：早稲田大学 小野記念講堂，東京都  

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Event date： 2015.3.2

Language：Japanese   Presentation type：Poster presentation  

Venue：早稲田大学 小野記念講堂，東京都  

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Event date： 2015.1.13 - 2015.1.14

Language：Japanese   Presentation type：Poster presentation  

Venue：産業技術総合研究所 臨海副都心センター，東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.11 - 2015.1.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東海大学 高輪校舎．東京都  

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Event date： 2015.1.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京工業大学応用セラミックス研究所，神奈川県  

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Event date： 2015.1.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京工業大学応用セラミックス研究所，神奈川県  

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Event date： 2014.12.3

Language：English   Presentation type：Poster presentation  

Venue：Tokyo, Japan  

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Event date： 2014.10.28

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：尼崎リサーチ・インキュベーションセンター，兵庫県  

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Event date： 2014.10.22

Language：English   Presentation type：Poster presentation  

Venue：San Diego, USA  

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Event date： 2014.10.22

Language：English   Presentation type：Oral presentation (general)  

Venue：San Diego, USA  

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Event date： 2014.10.22

Language：English   Presentation type：Poster presentation  

Venue：San Diego, USA  

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Event date： 2014.10.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Matsue, Japan  

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Event date： 2014.9.19

Language：English   Presentation type：Oral presentation (general)  

Venue：北海道大学，北海道  

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Event date： 2014.9.17

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学，北海道  

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Event date： 2014.6.18

Language：English   Presentation type：Oral presentation (general)  

Venue：Vilnius, Lithuania, Japan  

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Event date： 2014.6.13

Language：English   Presentation type：Oral presentation (general)  

Venue：Montecatini Terme, Italy  

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Event date： 2014.5.27

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：大阪大学，大阪府  

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Event date： 2014.4.24

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京ビッグサイト，東京都  

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Event date： 2014.3.26

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宮崎県婦人会館 会議室「ほうおう」，宮崎県  

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Event date： 2014.3.19

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大学，神奈川県  

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Event date： 2014.3.19

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大学，神奈川県  

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Event date： 2014.3.19

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大学，神奈川県  

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Event date： 2014.3.19

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大学，神奈川県  

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Event date： 2014.3.7

Language：Japanese   Presentation type：Poster presentation  

Venue：東京医科歯科大学 M&Dタワー，東京都  

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Event date： 2014.3.4

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：トルンプ株式会社，神奈川県  

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Event date： 2014.2.4

Language：English   Presentation type：Poster presentation  

Venue：San Francisco, USA  

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Event date： 2014.1.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場，福岡県  

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Event date： 2014.1.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北九州国際会議場，福岡県  

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Event date： 2014.1.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学接合科学研究所，大阪府  

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Event date： 2013.12.14

Language：English   Presentation type：Poster presentation  

Venue：Nagoya, Aichi, Japan  

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Event date： 2013.12.14

Language：English   Presentation type：Poster presentation  

Venue：Nagoya, Aichi, Japan  

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Event date： 2013.12.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪大学接合科学研究所，大阪府  

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Event date： 2013.12.4

Language：Japanese   Presentation type：Poster presentation  

Venue：東京大学 生産技術研究所，東京都  

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Event date： 2013.12.4

Language：Japanese   Presentation type：Poster presentation  

Venue：東京大学 生産技術研究所，東京都  

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Event date： 2013.12.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Las Vegas, USA  

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Event date： 2013.9.17

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学．京都府  

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Event date： 2013.9.16

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：同志社大学．京都府  

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Event date： 2013.9.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山理科大学（25号館，創立50周年記念館），岡山県  

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Event date： 2013.7.25

Language：English   Presentation type：Oral presentation (general)  

Venue：Nigata, Japan  

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Event date： 2013.5.7

Language：Japanese   Presentation type：Poster presentation  

Venue：関西大学 100周年記念会館，大阪府  

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Event date： 2013.5.7

Language：Japanese   Presentation type：Poster presentation  

Venue：関西大学 100周年記念会館，大阪府  

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Event date： 2013.4.17

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：学術総合センター，東京都  

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Event date： 2013.3.29

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神奈川工科大学，神奈川県  

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Event date： 2013.2.5

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

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Event date： 2013.1.30

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路商工会議所，兵庫県  

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Event date： 2013.1.30

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路商工会議所，兵庫県  

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Event date： 2013.1.30

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路商工会議所，兵庫県  

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Event date： 2013.1.28

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路商工会議所，兵庫県  

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Event date： 2012.11.6

Language：English   Presentation type：Poster presentation  

Venue：Toyohashi, Aichi, Japan  

ISAEM-2012 (The 5th International Symposium on Designing,Processing and Properties of Advanced Engineering Materials) and AMDI-3 (The 3rd International Symposium on Advanced Materials Development and Integration of Novel Structural Metallic and Inorganic Materials)

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Event date： 2012.9.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学，愛媛県  

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Event date： 2012.9.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学，愛媛県  

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Event date： 2012.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Anaheim, CA, USA  

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Event date： 2012.9

Language：English   Presentation type：Poster presentation  

Venue：Kurashiki, Japan  

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Event date： 2012.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Washington DC, USA  

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Event date： 2012.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Washington DC, USA  

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