Influence of interfacial rheology on drainage from curved surfaces

被引:62
作者
Bhamla, M. Saad [1 ]
Giacomin, Caroline E. [2 ]
Balemans, Caroline [3 ]
Fuller, Gerald G. [1 ]
机构
[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA
[2] McGill Univ, Dept Chem Engn, Montreal, PQ, Canada
[3] Eindhoven Univ Technol, Dept Mech Engn, NL-5600 MB Eindhoven, Netherlands
关键词
AIR-WATER-INTERFACE; STRESS RHEOMETER; TEAR FILM; INSOLUBLE SURFACTANTS; DROPLET COALESCENCE; LIQUID-FILMS; SOAP FILMS; MONOLAYERS; STABILITY; VISCOSITY;
D O I
10.1039/c3sm52934g
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
Thin lubrication flows accompanying drainage from curved surfaces surround us (e.g., the drainage of the tear film on our eyes). These draining aqueous layers are normally covered with surface-active molecules that render the free surface viscoelastic. The non-Newtonian character of these surfaces fundamentally alters the dynamics of drainage. We show that increased film stability during drainage can occur as a consequence of enhanced surface rheology. Increasing the surfactant layer viscosity decreases the rate of drainage; however, this retarding influence is most pronounced when the insoluble surfactant layer has significant elasticity. We also present a simple theoretical model that offers qualitative support to our experimental findings.
引用
收藏
页码:6917 / 6925
页数:9
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