Elucidation of Role of Line Tension on Domain Formation in Gibbs Adsorbed Films at Liquid/Liquid Interfaces

研究软界面（如液/液界面）的结构和性质是有价值的，例如，为了了解乳液、囊泡和生物膜等更复杂的分子组织系统的结构和功能之间的相关性。在这项研究中，我们的目的是通过界面张力和同步加速器x射线反射率测量，从域线张力的角度阐明软界面上域色散的稳定性。结果表明：稳定性主要受四个因素的相互作用支配；(1)畴线张力，(2)畴边界上的偶极相互作用，(3)畴间相互作用，(4)畴周围溶质和溶剂分子混合的熵。此外，如果在软界面处自发形成多层，我们认为多层的厚度应该是不均匀的。

The study on the structure and property of soft interfaces such as liquid/liquid interfaces is valuable, for example, in order to understand the correlation between the structure and function of more complicated molecular organized systems including emulsion, vesicle, and biological membranes. In this study, we aim at elucidating the stability of domain dispersion at soft interfaces from the viewpoint of domain line tension by interfacial tension and synchrotron X-ray reflectivity measurements. It was concluded that the the stability is governed by interplay among mainly four factors ; (1) domain line tension, (2) dipole interaction on the domain boundary, (3) interaction between domains, and (4) entropy of mixing of solute and solvent molecules around the domain. Furthermore, in case of spontaneous multilayer formation at soft interfaces, we claimed that the multilayer should be heterogeneous in thickness.