Skin formation in drying a film of soft matter solutions：Application of solute based Lagrangian scheme  

作　　者：罗凌 孟凡龙 张俊英 Masao Doi 

机构地区：[1]School of Physics and Nuclear Energy Engineering Beihang University, Beijing 100191, China [2]Center of Soft Matter Physics and its Applications Beihang University, Beijing 100191, China [3]Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom

出　　处：《Chinese Physics B》2016年第7期356-360,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science of China(Grant Nos.21434001,51561145002,and 11421110001)

摘　　要：When a film of soft matter solutions is being dried, a skin layer often forms at its surface, which is a gel-like elastic phase made of concentrated soft matter solutions. We study the dynamics of this process by using the solute based Lagrangian scheme which was proposed by us recently. In this scheme, the process of the gelation（i.e., the change from sol to gel） can be naturally incorporated in the diffusion equation. Effects of the elasticity of the skin phase, the evaporation rate of the solvents, and the initial concentration of the solutions are discussed. Moreover, the condition for the skin formation is provided.When a film of soft matter solutions is being dried, a skin layer often forms at its surface, which is a gel-like elastic phase made of concentrated soft matter solutions. We study the dynamics of this process by using the solute based Lagrangian scheme which was proposed by us recently. In this scheme, the process of the gelation（i.e., the change from sol to gel） can be naturally incorporated in the diffusion equation. Effects of the elasticity of the skin phase, the evaporation rate of the solvents, and the initial concentration of the solutions are discussed. Moreover, the condition for the skin formation is provided.

关 键 词：soft matter solution skin formation Onsager principle solute based Lagrangian scheme 

分 类 号：TB383.2[一般工业技术—材料科学与工程]