Microscopic Structure and Elasticity of Weakly Aggregated Colloidal Gels

by: AD Dinsmore, V Prasad, IY Wong, DA Weitz

Physical Review Letters, Vol. 96, No. 18. (2006)

View FullText article

Scitation (AIP), APS Permanent Link, DOI

Reviews [Write a review of this article]

There are no reviews of this article

Find related articles from these CiteULike users

weeks, dchen, ianwong

Find related articles with these CiteULike tags

colloidal-gel, colloids, confocal, depletion, dinsmore, elasticity, gel, journalclub, journal-club, pmma, weitz

摘要

We directly probe the microscopic structure, connectivity, and elasticity of colloidal gels using confocal microscopy. We show that the gel is a random network of one-dimensional chains of particles. By measuring thermal fluctuations, we determine the effective spring constant between pairs of particles as a function of separation; this is in agreement with the theory for fractal chains. Long-range attractions between particles lead to freely rotating bonds, and the gel is stabilized by multiple connections among the chains. By contrast, short-range attractions lead to bonds that resist bending, with dramatically suppressed formation of loops of particles.

@article{citeulike:1676566, abstract = {We directly probe the microscopic structure, connectivity, and elasticity of colloidal gels using confocal microscopy. We show that the gel is a random network of one-dimensional chains of particles. By measuring thermal fluctuations, we determine the effective spring constant between pairs of particles as a function of separation; this is in agreement with the theory for fractal chains. Long-range attractions between particles lead to freely rotating bonds, and the gel is stabilized by multiple connections among the chains. By contrast, short-range attractions lead to bonds that resist bending, with dramatically suppressed formation of loops of particles.}, author = {Dinsmore, A. D. and Prasad, V. and Wong, I. Y. and Weitz, D. A. }, citeulike-article-id = {1676566}, doi = {http://dx.doi.org/10.1103/PhysRevLett.96.185502}, journal = {Physical Review Letters}, keywords = {colloidal-gel, colloids, confocal, depletion, elasticity, journal-club, pmma}, number = {18}, posted-at = {2007-09-19 17:42:42}, priority = {0}, publisher = {APS}, title = {Microscopic Structure and Elasticity of Weakly Aggregated Colloidal Gels}, url = {http://dx.doi.org/10.1103/PhysRevLett.96.185502}, volume = {96}, year = {2006} }

RIS record

TY - JOUR ID - citeulike:1676566 L3 - citeulike-article-id:1676566 N2 - We directly probe the microscopic structure, connectivity, and elasticity of colloidal gels using confocal microscopy. We show that the gel is a random network of one-dimensional chains of particles. By measuring thermal fluctuations, we determine the effective spring constant between pairs of particles as a function of separation; this is in agreement with the theory for fractal chains. Long-range attractions between particles lead to freely rotating bonds, and the gel is stabilized by multiple connections among the chains. By contrast, short-range attractions lead to bonds that resist bending, with dramatically suppressed formation of loops of particles. IS - 18 JF - Physical Review Letters TI - Microscopic Structure and Elasticity of Weakly Aggregated Colloidal Gels PB - APS VL - 96 KW - colloidal-gel KW - colloids KW - confocal KW - depletion KW - elasticity KW - journal-club KW - pmma AU - Dinsmore, AD AU - Prasad, V AU - Wong, IY AU - Weitz, DA PY - 2006/// UR - http://dx.doi.org/10.1103/PhysRevLett.96.185502 ER -

RIS BibTeX