Cited Article: Thompson, P. A general boundary condition for liquid flow at solid surfaces
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Number of Citing Articles: 1 new records this week (1 in this e-mail)
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Title:
Boundary Conditions at the Liquid-Liquid Interface in the Presence of Surfactants
Authors:
Hu, YX; Zhang, XR; Wang, WC
Author Full Names:
Hu, Yangxu; Zhang, Xianren; Wang, Wenchuan
Source:
LANGMUIR 26 (13): 10693-10702 JUL 6 2010
Language:
English
Document Type:
Article
KeyWords Plus:
MOLECULAR-DYNAMICS; SOLID-SURFACES; RHEOLOGICAL MEASUREMENTS; MONTE-CARLO; SHEAR-FLOW; SLIP; MICROSCOPY; ADSORPTION; GRAPHITE
Abstract:
In this work, we studied the flow boundary conditions for the interface between two immiscible liquids under the condition of low shear rates in the presence or absence of surfactants. Our simulation results indicate that the boundary conditions are substantially changed by the presence of surfactants. Similar to the liquid solid boundary, several boundary conditions at immiscible liquid liquid interfaces, including slip, no-slip, and locking boundary conditions, are observed depending on the interfacial surfactant concentration. The slip boundary condition is achieved only at zero or lower surfactant concentration. The locking boundary condition is observed when the surfactant concentration is large enough to form a fully developed monolayer whereas the no-slip condition occurs for systems with in values of surfactant concentration. The slip, no-slip, and locking boundary conditions yield the positive, zero, and negative slip lengths, respectively. We also investigated the !
dependence of boundary slip on shear rate at different interfacial surfactant concentrations. Compared to the systems without surfactants, the increase in slip with shear rate slows down because of the presence of surfactants, and consequently, the linear dependence of slip length changes to a nonlinear dependence. Simulation results also indicate that the shear rate also affects the surfactant distribution. In particular, when the surfactant concentration is high enough to form a fully developed monolayer, the higher shear rate would make the monolayer rupture.
Reprint Address:
Zhang, XR, Beijing Univ Chem Technol, Minist Educ, Key Lab Nanomat, Div Mol & Mat Simulat, Beijing 100029, Peoples R China.
Research Institution addresses:
[Hu, Yangxu; Zhang, Xianren; Wang, Wenchuan] Beijing Univ Chem Technol, Minist Educ, Key Lab Nanomat, Div Mol & Mat Simulat, Beijing 100029, Peoples R China
E-mail Address:
zhangxr@mail.buct.edu.cn
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Cited Reference Count:
30
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
ISSN:
0743-7463
DOI:
10.1021/la101025h
IDS Number:
616VX
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