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论文类型：期刊论文

发表时间：2008-10-01

发表刊物：COMPUTATIONAL MATERIALS SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：43

期号：4

页面范围：796-801

ISSN号：0927-0256

关键字：Computer simulation; Stokesian dynamics; Colloidal particle monolayer; Non-equilibrium simulation

摘要：A theoretical study of the non-equilibrium behaviour of colloidal particle monolayers under the influence of the displacement of a single, optically trapped colloidal particle is presented. Two different types of monolayer (i.e., one relatively rigid and the other relatively soft) confined to a liquid-liquid interface are investigated using the Stokesian dynamics simulation technique. An effective dipole-dipole interaction is assumed to act between the colloidal particles and viscous drag forces acting on the particles are taken into account. The calculations reveal periodic oscillations of the net force on the trapped particle for the soft monolayer and highly non-linear, non-monotonic variations for the rigid monolayer. The highly non-linear variations of the net force for the rigid monolayer are concomitant with rapid, cooperative particle rearrangements and large oscillations in the global orientational order parameter of the monolayer. These findings, combined with the results of optical-tweezer experiments, should be useful for the rheology of liquid interfaces and the investigation of Pickering emulsions. (c) 2008 Elsevier B.V. All rights reserved.