Strain hardening of fractal colloidal gels

被引：127

作者：

Gisler, T

Ball, R

Weitz, DA

机构：

[1] Univ Penn, Dept Phys, Philadelphia, PA 19104 USA

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.82.1064

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on experiments on the rheology of gels formed by diffusion-limited aggregation of neutrally buoyant colloidal particles. These gels form very weak solids, with the elastic modulus, G'(omega), larger than the loss modulus, G "(omega), and with both G'(omega) and G "(omega) exhibiting only a very weak frequency dependence. Upon small but finite strains gamma < 0.45 the elastic modulus increases roughly exponentially with gamma(2). We explain the observed strain hardening with the highly nonlinear elastic response of the rigid backbone of the gel to elongational deformation.

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页码：1064 / 1067

页数：4

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