2021 Fiscal Year Final Research Report
Development and its application of ultrasonic scattering techniques that enables simultaneous analysis of particle size distribution, elastic moduli, and surface properties
| Project/Area Number |
19H02776
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 超音波 / 微粒子 |
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| Outline of Final Research Achievements |
Mixtures of microparticles and liquids are ubiquitous and used in various applications, such as cosmetics, paints, and electrode materials for batteries. It is desirable for particulates to be uniformly dispersed in a liquid and remain stable over a long period of time, but so far, optically turbid samples or concentrated samples often required considerable dilution. We have developed a technique to analyze nanopartciles and/or micron-sized particle by using ultrasound which has been utilized in fetal echodiagnosis. Furthermore, we have realized the non-diluted analysis of not only the size of such nano- and micron-sized particles, but also their rigidity and surface charge in liquid. Furthermore, even more advanced analysis of the state of particles localized around a large oil droplet, namely Pickering emulsions, has also been realized.
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| Free Research Field |
微粒子分散系の構造・物性解析
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| Academic Significance and Societal Importance of the Research Achievements |
微粒子の構造や物性の基礎的な解析法は、ほぼ確立されているが、比較的希薄で、かつ光の波長程度の構造体に限定されてきた。粒子の集合体はナノからミクロンにも及ぶことがあり、基礎学術的な理解に加えて、産業界で分散性の制御や安定性の確認を行うためには、定量的かつ無希釈で解析できる従来の限界を克服した手法の開発が必要不可欠である。その点で、本研究で開発した超音波散乱法は、ナノからマイクロメートル領域の構造体に対し、粒子の大きさはもちろん、硬さや表面特性を評価することを可能にしており、今後様々な微粒子分散系の特性解析において有用な技術になると期待される。
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