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Effect of Impurity on Critical Conditions of Colloidal Cluster Nucleation in Colloidal System
Yuan-xiang Deng,Chang-ming Xiao*
Author NameAffiliationE-mail
Yuan-xiang Deng School of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, China  
Chang-ming Xiao* Department of Physics, Hunan Normal University, Changsha 410081, China cmxiao@hunnu.edu.cn 
Abstract:
Due to depletion interactions, a few of colloidal spheres will be packed into cluster or clusters, even a phase transition may take place if the volume fraction of system is large enough. In a binary colloidal system, if the mole fraction of one component is very small, then it can be taken as the impurity of the other component. In this work, the effect of impurity on critical conditions of colloidal cluster nucleation was studied by Carnahan-Starling state equation and the principle of entropy maximum. The results show that, even the mole fraction of small-spheres is very small, the critical volume fraction is obvious smaller than that of one component system, so the influence on critical volume fraction from impurity is very huge and cannot be ignored. In addition, it is also found that, the larger the volume fraction of the system is, the larger cluster density can be packed, however, the critical size of nucleating cluster is almost independent of the density of the cluster.
Key words:  Cluster sphere, Cluster density, Cluster nucleation
FundProject:
杂质对硬球系统团簇成核临界条件的影响
邓元祥,肖长明*
摘要:
通过CS状态方程及熵极大原理在多元胶体系统研究了杂质对硬球系统团簇成核临界条件的影响. 极少量元素或杂质的小胶球对系统成核的临界条件的影响也是不可忽略的: 成核的临界体积分量显著地降低;此外,研究还发现杂质对成核的临界尺寸影响较少.
关键词:  团簇胶球,团簇密度,团簇成核
DOI:10.1063/1674-0068/27/05/559-562
分类号: