Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (1): 180-182. Previous Articles    

Original Articles

沉降对不同粒径聚苯乙烯胶乳球异向聚集的影响

戴国亮;董向群;乔润龙;孙祉伟;胡文瑞   

  1. 中国科学院力学研究所国家微重力实验室
  • 出版日期:2002-01-15 发布日期:2002-01-15

Influence of sedimentation on perikinetic coagulation of different size of polystyrene spheres

DAI GUOLIANG;DONG XIANGQUN;QIAO RUNLONG;SUN ZHIWEI;HU WENRUI   

  • Online:2002-01-15 Published:2002-01-15

R. Folkersma et al. had reported that the perikinetic coagulation rate of 2 μm polystyrene(PS) spheres increased remarkably under microgravity conditions. Otherwise, Z. W. Sun et al. had provided their evidence showing that it was only appreciably faster under microgravity than under normal gravity. In order to test the influence of sedimentation on different size of PS spheres, on the basis of Sun's experiments, we have studied the coagulation rates of 1 μm, 2 μm, 3 μm and the mixture of 1 μm and 2 μm PS spheres. Turbidity versus time was employed to monitor the salt-induced coagulation process of PS dispersions. 0.5 mol.L^-^1 MgCl~2 was used to induce fast aggregation. The results show that there is no difference in perikinetic coagulation rate under normal gravity and microgravity for 1 μm, 2 μm, 3 μm and 1 μm+2 μm PS. The authors assumed the surface properties of PS spheres and experimental method might account for the different results.

Key words: SETTLING, MICROGRAVITY, ACCUMULATE, POLYSTYRENE, LATEX

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