THE ROLE OF SURFACE-ROUGHNESS AND CONTACT DEFORMATION ON THE HYDRODYNAMIC DETACHMENT OF PARTICLES FROM SURFACES

被引:75
作者
DAS, SK
SCHECHTER, RS
SHARMA, MM
机构
[1] UNIV TEXAS,DEPT PETR ENGN,AUSTIN,TX 78712
[2] UNIV TEXAS,DEPT CHEM ENGN,AUSTIN,TX 78712
关键词
D O I
10.1006/jcis.1994.1144
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effects of elastic deformation and surface roughness on the hydrodynamic detachment of colloidal particles from surfaces have been studied. Experimental results for glass and polystyrene particles on glass and mica substrates are reported. A theoretical model is developed using a Green's function formulation to ex plain the origin of the restraining torque acting on the particle Two limiting situations are analyzed: (a) rigid sphere on a deformable substrate and, (b) deformable sphere on a rigid substrate. It is concluded that surface roughness is a necessary condition to account for the observed critical hydrodynamic force. The magnitude of this critical force has been found to depend on three competing factors: particle roughness, roughness of the substrate, and the extent of contact deformation. (C) 1994 Academic Press, Inc.
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页码:63 / 77
页数:15
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