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Chin. Phys. B, 2016, Vol. 25(7): 076801    DOI: 10.1088/1674-1056/25/7/076801
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Ling Luo(罗凌)1,2, Fanlong Meng(孟凡龙)3, Junying Zhang(张俊英)1, Masao Doi2
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
Abstract  

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.

Keywords:  soft matter solution      skin formation      Onsager principle      solute based Lagrangian scheme  
Received:  11 March 2016      Revised:  21 April 2016      Published:  05 July 2016
PACS:  68.03.Fg (Evaporation and condensation of liquids)  
  68.35.Fx (Diffusion; interface formation)  
  83.10.Tv (Structural and phase changes)  
Fund: 

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

Corresponding Authors:  Masao Doi     E-mail:  masao.doi@buaa.edu.cn

Cite this article: 

Ling Luo(罗凌), Fanlong Meng(孟凡龙), Junying Zhang(张俊英), Masao Doi Skin formation in drying a film of soft matter solutions: Application of solute based Lagrangian scheme 2016 Chin. Phys. B 25 076801

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