Adsorption of Janus particles to curved interfaces(Poster session 2, New Frontiers in Colloidal Physics : A Bridge between Micro- and Macroscopic Concepts in Soft Matter)

Abstract

球状のJanus粒子の球状の液・液界面への吸着について理論的な解析を行った.粒子の平衡での接触角が粒子表面のジオメトリ,それぞれの部分の濡れ性,そして界面の曲率によって決定されることを示す.一様な表面の粒子の場合とは対照的に,Janus粒子はある条件を満たす場合に自発曲率を持つことが分かった.

Particles which have two distinct parts are called "Janus particles" in the name of the dual-faced Janus god. By providing two different chemical and/or physical properties to a single particle, one can produce various kinds of Janus particles which are useful in many modern technologies. Here we focus on the Janus particles which are analogous to surfactant molecules having both hydrophilic and hydrophobic parts. Such amphiphilic particles were obtained by Casagrande et al. from glass spherical particles. They studied the adsorption of the Janus particles at oil/water interfaces, and showed that they behave differently from ordinary solid particles.