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A Brownian dynamic simulation to verify the effective hard-sphere model criterion for the formation of charged colloidal crystals
Authors
孙祉伟
徐升华
顾凌云
Publication date
15 December 2011
Publisher
Abstract
在对胶体晶体的研究中,带电粒子胶体晶体的形成机理比硬球胶体晶体更加复杂,对其形成条件目前还缺少有效的判断依据.有效硬球模型判据提出以有效直径作为判断参数.为了验证该判据的有效性,利用布朗动力学模拟研究了不同有效直径下带电粒子胶体晶体的特性.为了更加定量地研究单因素对带电胶体晶体形成的影响,取有效直径为2.8至0.8,并对一定的有效直径,研究了粒子几何直径和排斥力不同情况下的结晶行为.在布朗动力学模拟过程中,采用径向分布函数和键序参数方法检测体系的结构变化,并分析所形成的晶体结构.结果表明,在判断带电粒子胶体体系能否形成有序结构方面,有效硬球模型判据有一定的合理性.但是,并不能将有效直径作为唯一的判别参数,而是需要综合其他参数的影响,这显示出该判据的片面性
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 12/02/2018