Auto-stratification in drying colloidal dispersions: A diffusive model

被引：80
作者：
Trueman, R. E. [1 ]
Domingues, E. Lago [2 ]
Emmett, S. N. [2 ]
Murray, M. W. [2 ]
Routh, A. F. [1 ]
机构：
[1] Univ Cambridge, Dept Chem Engn & Biotechnol, Cambridge CB2 3RA, England
[2] AkzoNobel, Slough SL2 5DS, Berks, England
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2012年 / 377卷
基金：
英国工程与自然科学研究理事会;
关键词：
Stratification; Diffusion; Colloidal hydrodynamics; FILM FORMATION; LATEX DISPERSIONS; SEGREGATION; AUTOSTRATIFICATION; MORPHOLOGY; WATER;
D O I：
10.1016/j.jcis.2012.03.045
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The mechanism by which the particles in a drying film come into close packing during solvent evaporation has an important role to play in the final film morphology. During drying the particles can develop non-uniform concentrations across the vertical height of the film, depending on their diffusion rate. By applying the principles of classical diffusion mechanics to a hard sphere system, a theory for this novel method of stratification during drying of a two component film has been derived. The model is dependent on the particle Peclet numbers and when one is above unity and the other below, maximum stratification is observed. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码：207 / 212
页数：6
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