Microchemistry Based on Single Colloidal and Aerosol Particles

基于激光捕获-微光谱学的新技术在溶液中单个微米大小的胶体粒子和空气中单个气溶胶水滴的研究中得到了发展。特别是，我们已经开发了温度和湿度控制的激光捕获空气中的单个气溶胶水滴。我们还通过实验证实了光诱导气溶胶液滴在空气中的形成，并阐明了其机理。此外，我们还成功地基于单个气溶胶液滴的拉曼散射光的低语廊模式共振确定了单个气溶胶液滴在纳米级的大小。我们还发现，阳离子染料在单个阳离子交换树脂微颗粒中的颗粒内扩散是由树脂/水界面产生的Donnan电膜电位决定的，这是第一次观察到单个离子交换微颗粒。

Novel techniques based on laser trapping - microspectroscopy on single micrometer-sized colloidal particles in solution as well as single aerosol water droplets in air have been developed. In particular, we have developed temperature- and moisture-controlled laser trapping of single aerosol water droplets in air. We also confirmed experimentally photoinduced aerosol droplet formation in air and its mechanistic aspects were elucidated. Furthermore, we succeeeded in determining the sizes of single aerosol droplets in a nanometer level based on whipering gallery mode resonances of Raman scattering light in single aerosol droplets. We also showed that the intraparticle diffusion of a cation dye in single cation-exchange resin microparticles was determined by the Donnan electric membrane potential generated at the resin/water interface, which was the first observation for single ion-exchange microparticles.