Faculty Profiles - HAYAKAWA Satoshi

MISC - HAYAKAWA Satoshi

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Apatite induction on titania due to combined chemical and thermal treatments of titanium

S Hayakawa, K Shibata, K Tsuru, A Osaka

BIOCERAMICS 14 218-2 71 - 74 2002

Language：English Publisher：TRANS TECH PUBLICATIONS LTD

We examined the effects of the thermal treatment temperature and Ta(V) species on in vitro apatite forming-ability of titania due to chemical treatment of titanium substrates. The formation of peroxo Ta(V) species (Ta(V)O-2) in the H2O2 solution at 60degreesC effectively promoted not only the decomposition and the elimination of the peroxo and hydroperoxide groups, such as Ti-OOH and Ta-OOH in the titania gel but also the decomposition of H2O2 Compared with the formation of peroxo Ti(rV) species (Ti(IV)O-2), resulting in enhanced ability of apatite deposition in spite of thermal treatment at the lower temperature such as 100degreesC. The combined chemical and thermal treatments were applicable for providing both pieces of Ti and Ti mesh with bioactivity.

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Chitosan-organosiloxane hybrids for biomedical applications

YAMADA A

Abstract of the 3^<rd> Asian international Symposium on Biomaterials and Drug Delivery Systems, 2002 2002

Surface Characterization and Platelet Adhesion of Alginic Acid Layers on Glass Substrates

T. Yoshioka, K. Tsuru, S. Hayakawa, A. Osaka

Proc. 3rd Asian Internatl. Symposium on Biomaterials and Drug Delivery Systems 2002

Crystallization of Anatase from Amorphous Titania in Hot Water and In Vitro Biomineralzation

Jin-Ming WU, Satoshi HAYAKAWA, Kanji TSURU, Akiyoshi OSAKA

J.Ceram.Soc.Japan 110 ( 1278 ) 78 - 80 2002

Lab Tour : Department of Bioscience & Biotechnology, Faculty of Engineering, Okayama University

19 ( 6 ) 51 - 53 2001.12

Sol-Gel Derived Porous Gelatin-Siloxane Hybrids

K. Tsuru L. Ren, S. Hayakawa, A. Osaka

Internatl. Symposia on Materials Science for the 21st Century, Vol. B, Soc. Mater. Sci. Japan 2001

有機無機複合体の高機能性材料への応用

都留寛治, 早川聡, 尾坂明義

ケミカル・エンジニヤリング 46,No.10,25頁-31頁 ( 10 ) 769 - 775 2001

多孔質シリカゲルでのアパタイト形成

久保正明, 都留寛治, 早川聡, 尾坂明義

化学工業，特集：セラミックス生体材料の展望 52巻5号,372〜378 ( 5 ) 372 - 378 2001

In Vitro Apatite Formation on Titanium Treated with a Hydrogen Peroxide Solution

Koichi Shibata, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka

Proceedings of 18th International Korea-Japan Seminar on Ceramics 2001

Synthesis of PDMS Based Porous Materials for Biomedical Applications

T. Yabuta E, P. Bescher J, D. Mackenzie, K. Tsuru, S. Hayakawa, A. Osaka

11th Internatl. Workshop on Glasses, Ceramics, Hybrids and Nanocomposites from Gels 2001

金属チタン表面の高生体活性化

川邊康宏, 都留寛治, 早川聡, 尾坂明義

化学工業，特集：セラミックス生体材料の展望 52巻5号,349〜353 ( 5 ) 349 - 353 2001

In Vitro Evaluation of the Osteoblast Response to Sol-Gel Derived Gelatin-Siloxane Hybrids

L. Ren, K. Tsuru, S. Hayakawa, A. Osaka

11th Internatl. Workshop on Glasses, Ceramics, Hybrids and Nanocomposites from Gels 2001

Bioactivity and Structure of Alkali Borosilicate Glasses

K. Tsuru, S. Hayakawa, C, Ohtsuki A. Osaka

Proc. XIX Internatl. Congress on Glass, Society of Glass Technology 2001

Structure of Divalent Metal Oxyfluorosilicate Glass

S. Hayakawa, A. Osaka

Proc. XIX Internatl. Congress on Glass, Society of Glass Technology 2001

Effects of Metal Ions in Simulated Body Fluids on Biomimetic Reactions of Materials

K. Tsuru, N. Azuma, M. Kubo, S. Hayakawa, A. Osaka

Internatl. Symposia on Materials Science for the 21st Century, Vol. B, Soc. Mater. Sci. Japan 2001

Improvement of Biocompatibility of Silicone Elastomer by Surface Modification

Shirosaki Yuki, Tsuru Kanji, Hayakawa Satoshi, Osaka Akiyoshi, Takashima Seisuke

Memoirs of the Faculty of Engineering, Okayama University 36 ( 1 ) 117 - 121 2001

In vitro apatite deposition and biodegradation of porous gelatin-silicate hybrids derived from sol-gel process

Lei Ren, Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka

Materials Research Society Symposium - Proceedings 628 2000.1

Ca(II) containing porous hybrids of gelatin and 3-(glycidoxypropyl) trimethoxysilane (GPSM) were prepared with sol-gel processing and freeze-drying techniques. The freezing temperature could control porosity and pore size of the hybrids. The biodegradation rate of the hybrids in a Tris buffer solution decreased with an increase in GPSM content. The bone-like apatite layer could form on the Ca(II) containing porous gelatin-silicate hybrids when they were soaked in a stimulated body fluid (SBF), hence they were applicable to be the bioactive scaffolds for bone tissue engineering.

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Biomimetic Deposition of Calcium Phosphated in a Simulated Body Fluid

HAYAKAWA S, OSAKA A

J. Non-Cryst. Solids 263/264 409 - 415 2000

Mechanism of apatite formation on a sodium silicate glass in a simulated body fluid

S Hayakawa, K Tsuru, C Ohtsuki, A Osaka

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 82 ( 8 ) 2155 - 2160 1999.8

Language：English Publisher：WILEY-BLACKWELL

Si-29 and P-31 magic-angle-spinning nuclear magnetic resonance (MAS-NMR) spectra were used to analyze 20Na(2)O . 80SiO(2) glass particles before and after soaking in a simulated body fluid (SBF; Kokubo solution, pH 7.4) for various periods (up to 14 d), The structure of the bulk glass and the glass surface, as well as the chemical states of the calcium phosphates adsorbed on the glass surface, were examined. The bulk glass before soaking in the SBF showed two Si-29 MAS-NMR resonances, at -100 and -110 ppm, which were attributable to Si(OSi)(3)ONa and Si(OSi)(4) units, respectively. A new -105 ppm peak, which was due to Si(OSi)(3)OH units, appeared after soaking in the SBF and grew as the soaking period increased, Thus, in the SBF, the glass network was degraded and hydrolyzed; that is, dissolution of the Na+ ions from the glass network and the formation of Si-O- groups occurred, After soaking for 1 d, a P-31 MAS-NMR IR resonance peak of orthophosphate (PO43-) ions that were deposited on the glass surface appeared at similar to 3.0 ppm and grew as the soaking period increased. The chemical shift shows that the local structural environment of phosphorus atoms and ions was very similar to that of hydroxyapatite or rabbit cortical bone. Inductively coupled plasma atomic emission spectroscopic analysis confirmed the adsorption of calcium phosphates on the glasses and the close relationship between the dissolution of the Naf ions and the precipitation of the calcium phosphates. It was concluded that the layer of hydrated silica gel, which was composed of Si(OSi)(3)O- units, provided the negatively charged sites that induced or promoted the precipitation of calcium phosphates, which led to apatite nucleation and crystallization.

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Biomimetic Deposition of Calcium Phosphates on Oxides Soaked in a Simulated Body Fluid

S. Hayakawa, A. Osaka

Proc. 15th Univ. Conf. Glass Sci., ed. R. K. Brow, Univ. Missouri-Rolla, Paper M12 1999

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