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Formation of a core-shell droplet in a thermo-responsive ionic liquid/water mixture by using optical tweezers
Maho Tanaka1, Yasuyuki Tsuboi1, Ken-Ichi Yuyama1
1Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, 3-3-138 Sugimoto Sumiyoshi-ku, Osaka-shi, 558-8585, Japan. k-yuyama@omu.ac.jp.
Abstract:
Many chemical and biological processes involve phase separation; however, controlling this is challenging. Here, we demonstrate local phase separation using optical tweezers in a thermo-responsive ionic liquid/water solution. Upon near-infrared laser irradiation, a single droplet is formed at the focal spot. The droplet has a core consisting of highly concentrated ionic liquid. The mechanism of the core-shell droplet formation is discussed in view of the spatial distribution of optical and thermal potentials.
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