Average cluster sizes and cluster size distributions of superfine nickel particles in light media  

作　　者：李敬生 杜飞虎 王娟 

机构地区：[1]School of Chemistry and Chemical Engineering,Jiangsu University

出　　处：《Journal of Central South University》2009年第3期399-404,共6页中南大学学报（英文版）

基　　金：Projects(50474037, 50874087) supported by the National Natural Science Foundation of China;Project (BK2006078) supported by the Natural Scientific Funds of Jiangsu Province,China

摘　　要：Effects of shear rates on average cluster sizes (ACSs) and cluster size distributions (CSDs) in uni- and bi-systems of partly charged superfine nickel particles were investigated by Brownian dynamics, and clustering properties in these systems were compared with those in non-polar systems. The results show that the ACSs in bi-polar systems are larger than those in the non-polar systems. In uni-polar systems the behavior of clustering property differs: at the lower ionic concentration (10%), repulsive force is not strong enough to break clusters, but may greatly weaken them. The clusters are eventually cracked into smaller ones only when concentration of uni-polar charged particles is large enough. In this work, the ionic concentration is 20%. The relationship between ACS and shear rates follows power law in a exponent range of 0.176-0.276. This range is in a good agreement with the range of experimental data, but it is biased towards the lower limit slightly.Effects of shear rates on average cluster sizes （ACSs） and cluster size distributions （CSDs） in uni-and bi-systems of partly charged superfine nickel particles were investigated by Brownian dynamics, and clustering properties in these systems were compared with those in non-polar systems. The results show that the ACSs in bi-polar systems are larger than those in the non-polar systems. In uni-polar systems the behavior of clustering property differs： at the lower ionic concentration （10%）, repulsive force is not strong enough to break clusters, but may greatly weaken them. The clusters are eventually cracked into smaller ones only when concentration of uni-polar charged particles is large enough. In this work, the ionic concentration is 20%. The relationship between ACS and shear rates follows power law in a exponent range of 0.176-0.276. This range is in a good agreement with the range of experimental data, but it is biased towards the lower limit slightly.

关 键 词：ionic concentration average cluster sizes cluster size distribution power law 

分 类 号：O614.813[理学—无机化学]