Continuous synthesis of spherical colloidal amorphous and its application for ultraviolet ray screening materials

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01633
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26030:Composite materials and interfaces-related
• Research Institution: Yokohama National University
• Principal Investigator: Kanai Toshimitsu 横浜国立大学, 大学院工学研究院, 教授 (10442948)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: コロイドアモルファス / マイクロ流体デバイス / 紫外線遮蔽剤

Outline of Final Research Achievements

We demonstrated that monodisperse spherical particles consisting of silica particles could be continuously synthesized by reacting monodisperse sodium silicate solution droplets, which generated in a microfluidic device, with ethanol. In addition, monodisperse elastomer particles including monodisperse PMMA particles could be prepared by microfluidic technique. The particles showed a broad reflection peak at approximately 400 nm, and hence, they had potential for application as ultraviolet ray screening materials.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、従来の紫外線吸収ではなく、コロイド結晶やコロイドアモルファスといったコロイド粒子の周期配列に基づく紫外線の反射や散乱による、フリーラジカルが発生しない安心・安全な紫外線遮蔽方法の可能性を示した。またマイクロ流体デバイスを用いてシリカ粒子が集積した球状粒子を短時間で効率よく連続的に合成できることを見出し、マイクロ化学プロセスの有用性を示した。