【摘要】 运用ＭｏｎｔｅＣａｒｌｏ方法模拟了粒子在重力场中扩散控制的沉降过程，获得了不同粒径下的沉降图样，并用分维进行了分析。结果表明，随着粒子半径的增大，沉降图样堆积得越来越紧密，当粒径小于４３０ｎｍ时，分维数随粒径的增大迅速增大；大于４３０ｎｍ时，分维数增长缓慢，最后趋近于２。更多还原

【Abstract】 MonteCarlo method is used to simulate the diffusioncontrolled deposition of colloid particles under gravity The effects of the particle sizes are studied by the deposit patterns, and their differences are characterized by their density functions and fractal dimensions (D) For small particles (x<430nm), the deposit morphologies are loose and irregular, and the fractal dimensions increased rapidly with the particle size For large particles (x>430nm), the deposit morphologies become much more compact, and their fractal dimensions approach to the closest deposition (D=2)更多还原