Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acs.langmuir.5c02004

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

Abstract

The structural integrity of microparticle-based films is maintained through interpenetration of the superficial polymer chains of the microparticles that physically crosslink neighboring microparticles. This structural feature is fundamentally different from those of conventional polymers prepared by solvent casting or bulk polymerization. To understand the mechanical properties of such microparticle-based films, it is necessary to investigate the behavior of their constituent particles. However, methods are still being developed to evaluate microscale structural changes in microparticle-based films during the stretching process leading to film fracture. In this study, we propose a method that combines a stretching stage with optical microscopy to investigate the changes in particle morphology and its positional relationship with surrounding particles during uniaxial tensile tests on microparticle-based films. In a film consisting of cross-linked poly(methyl acrylate) microparticles, the deformation of the particles deviated from affine deformation due to the cross-linked structure. However, the deformation of a group of several (local) particles was confirmed to be location-dependent and larger than that of each particle forming the film. The method established here can be used to contribute to the design of tough microparticle-based films.

DOI： 10.1038/s41428-025-01076-y

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Other Link： https://www.nature.com/articles/s41428-025-01076-y

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

<jats:p>By virtue of their unique properties, polymer nano/microparticles constitute important building blocks for the construction of functional nanomaterials.</jats:p>

DOI： 10.1039/d5cc00543d

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

<jats:title>Abstract</jats:title><jats:p>In the previous study (<jats:italic>Green Chem</jats:italic>., <jats:bold>2023</jats:bold>, <jats:italic>25</jats:italic>, 3418), highly stretchable and mechanically tough poly(methyl acrylate) (pMA) microparticle‐based elastomers can be formed by drying a microparticle‐containing aqueous dispersion. This discovery has the potential to overcome the mechanical weakness of industrially produced aqueous latex films. However, in 3D‐arranged particle films, structural complexity, such as the existence of defects, makes it difficult to clearly understand the relationship between the particle film structure and its mechanical properties. In this study, 2D‐ordered pMA particle monolayers at the air/water interface of a Langmuir trough are prepared. Under high compression at the air/water interface, the microparticles contact their neighboring particles, and the resulting monolayers can be successfully transferred onto a solid substrate. The compression of the monolayer films is linked to an increase in the elastic modulus of the monolayer film on the solid substrate as evident from the local Young's modulus mapping using atomic force microscopy. Thus, pMA particle films with different mechanical properties can be created using a Langmuir trough.</jats:p>

DOI： 10.1002/marc.202400604

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

DOI： 10.1021/acsami.4c16013

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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

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