HYDRODYNAMIC THICKENING OF DEPLETION LAYERS IN COLLOIDAL SOLUTIONS

被引：47

作者：

AUSSERRE, D

EDWARDS, J

LECOURTIER, J

HERVET, H

RONDELEZ, F

机构：

[1] COLL FRANCE, PHYS MAT CONDENSEE LAB, F-75231 PARIS 05, FRANCE

[2] UNIV PIERRE & MARIE, INST CURIE, PHYS & CHIM SECT, F-75231 PARIS 05, FRANCE

[3] UNIV PARIS 06, STRUCT & REACT INTERFACES LAB, F-75231 PARIS 05, FRANCE

[4] INST FRANCAIS PETR, F-92506 RUEIL-MALMAISON, FRANCE

来源：

EUROPHYSICS LETTERS | 1991年 / 14卷 / 01期

关键词：

LAMINAR FLOWS (INC COUETTE FLOW); FLUID SURFACES AND INTERFACES WITH FLUIDS (INC SURFACE TENSION; CAPILLARITY; WE; TTING AND RELATED PHENOMENA);

D O I：

10.1209/0295-5075/14/1/006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a new surface phenomenon in flowing colloidal suspensions of anisotropic particles. It is characterized by a decrease in the probability of presence of the solute particles near the cell walls when the solution is submitted to Poiseuille flows exceeding a minimum shear rate. The effect has been detected on dilute aqueous solutions of xanthan, a wormlike polysaccharide chain, by using the optical evanescent-wave-induced fluorescence method. The results obtained at various shear rates are in quantitative agreement with a simple model based on the chain dynamics near the repulsive wall, and taking into account the increased molecular tumbling rate induced by the shearing flow.

引用

页码：33 / 38

页数：6

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