剪应力下弱作用势胶体颗粒聚团的特点  

Characteristics of Colloidal Aggregates with Weakly Bound Potentiai under Shear

作　　者：李敬生[1] P.MarkRodger 

机构地区：[1]西安建筑科技大学冶金系,西安710055

出　　处：《物理化学学报》1997年第1期20-27,共8页Acta Physico-Chimica Sinica

摘　　要：探讨了不同剪应力下，具有Lennard－Jones势的胶体颗粒聚团的结构特性，包括簇团的大小分布，径向分布函数，分形维数和原子配位数．研究表明，在弱作用力下，胶体簇团的分布随剪应力的增加而趋向小簇团一边；径向分布函数曲线随剪应力的增加而降低，且在近程距离内降低得最多；分形维数随剪应力的增加表现为先增加后减小的趋势，其值随模拟条件的不同而在1.9－2.4之间变动．剪应力“场”对分形维数的大小没有太大的影响，但在较大的剪应力下，簇团被明显拉长，且其主轴对X轴（剪应力方向）产生偏离。PLesearch on characteristics of colloidal aggregates with Lennard-Jones potential under shear has been carried out. The features included cluster size distribution, radial distribution function, fractal dimension and coordination numbers. It revealed that cluster size distribution approached to smaller size, radial distribution function and coordination number reduced graduately with increasing shear rates. When shear rates increased, fractal dimension ranging 1.9-2.4 increased first then decreased slightly. Shear did not change fractal dimension obviously, however(clusters were stretched at X (shear rate) direction and deviated from the X direction at high shear rates.

关 键 词：胶体 聚团 计算机模拟 剪应力 L-J势 

分 类 号：O648.11[理学—物理化学]