表面粘度、扩散及层间摩擦力：模拟剪切作用下的两亲性双层膜
Surface viscosity, diffusion, and intermonolayer friction: simulating sheared amphiphilic bilayers.
作者信息
Shkulipa S A, den Otter W K, Briels W J
机构信息
Computational Dispersion Rheology, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands.
出版信息
Biophys J. 2005 Aug;89(2):823-9. doi: 10.1529/biophysj.105.062653. Epub 2005 May 13.
Abstract
The flow properties of an amphiphilic bilayer are studied in molecular dynamics simulations, by exposing a coarse grained model bilayer to two shear flows directed along the bilayer surface. The first field, with a vorticity perpendicular to the bilayer, induces a regular shear deformation, allowing a direct calculation of the surface viscosity. In experiments this property is measured indirectly, by relating it to the diffusion coefficient of a tracer particle through the Saffman-Einstein expression. The current calculations provide an independent test of this relation. The second flow field, with a vorticity parallel to the bilayer, causes the two constituent monolayers to slide past one another, yielding the interlayer friction coefficient.
摘要
通过将一个粗粒度模型双层膜暴露于沿双层膜表面定向的两种剪切流中，在分子动力学模拟中研究了两亲性双层膜的流动特性。第一个场的涡度垂直于双层膜，会引起规则的剪切变形，从而可以直接计算表面粘度。在实验中，通过将该特性与示踪粒子通过萨夫曼-爱因斯坦表达式的扩散系数相关联来间接测量此特性。当前的计算为这种关系提供了独立的检验。第二个流场的涡度平行于双层膜，导致两个组成单层相互滑动，从而得出层间摩擦系数。
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