Gravitational stability of suspensions of attractive colloidal particles

被引：48
|
作者：
Kim, Chanjoong [1 ]
Liu, Yaqian
Kuehnle, Angelika
Hess, Stephan
Viereck, Sonja
Danner, Thomas
Mahadevan, L.
Weitz, David A.
机构：
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Harvard Univ, DEAS, Cambridge, MA 02138 USA
[3] BASF AG, D-67056 Ludwigshafen, Germany
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 02期
关键词：
D O I：
10.1103/PhysRevLett.99.028303
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Colloidal suspensions are susceptible to gravitationally induced phase separation. This can be mitigated by the formation of a particle network caused by depletion attraction. The effectiveness of this network in supporting the buoyant weight of the suspension can be characterized by its compressional modulus. We measure the compressional modulus for emulsion networks induced by depletion attraction and present a model that quantitatively predicts their gravitational stability. We also determine the relationship between the strength of the depletion attraction and the magnitude of the compressional modulus.
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页数：4
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