具有粘弹性气液界面的固体表面上薄停滞膜的稳定性。

Stability of thin stagnant film on a solid surface with a viscoelastic air-liquid interface.

作者信息

Narsimhan Ganesan, Wang Zebin

机构信息

Biochemical and Food Process Engineering, Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA.

出版信息

J Colloid Interface Sci. 2005 Nov 1;291(1):296-302. doi: 10.1016/j.jcis.2005.04.093. Epub 2005 May 31.

DOI:10.1016/j.jcis.2005.04.093

PMID:15927194

Abstract

Linear stability analysis for a film on a solid surface with a viscoelastic air-liquid interface is presented. The interfacial dilatational and shear viscoelastic properties were described by Maxwell models. Dilatational and shear interfacial elasticity and viscosity were shown to improve film stability. When the interfacial rheological properties are extremely large or small, the maximum perturbation growth coefficient is shown to reduce to those for immobile and mobile interfaces respectively. Calculated values of maximum growth coefficient for thin film stabilized by 0.5% beta-lactoglobulin approached those of mobile films for thick (>2000 nm) and those for immobile films for thin (<100 nm) films respectively with the values lying between the two limits for intermediate film thicknesses.

摘要

本文给出了具有粘弹性气液界面的固体表面上液膜的线性稳定性分析。界面扩张和剪切粘弹性特性由麦克斯韦模型描述。结果表明，扩张和剪切界面弹性及粘度可提高液膜稳定性。当界面流变特性极大或极小时，最大扰动生长系数分别降至固定界面和移动界面的情况。由0.5%β-乳球蛋白稳定的薄膜的最大生长系数计算值，对于厚膜（>2000 nm）接近移动薄膜，对于薄膜（<100 nm）接近固定薄膜，而对于中间膜厚度，其值介于两者之间。