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)

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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.

@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 = {10.1103/PhysRevLett.96.185502}, journal = {Physical Review Letters}, keywords = {colloids, dinsmore, elasticity, gel, journalclub, weitz}, number = {18}, posted-at = {2008-04-23 20:02:24}, priority = {2}, publisher = {APS}, title = {Microscopic Structure and Elasticity of Weakly Aggregated Colloidal Gels}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000096000018185502000001\&idtype=cvips\&gifs=yes}, volume = {96}, year = {2006} }

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TY - JOUR ID - citeulike:1676566 L3 - citeulike-article-id:1676566 TI - Microscopic Structure and Elasticity of Weakly Aggregated Colloidal Gels JF - Physical Review Letters VL - 96 IS - 18 PB - APS 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. KW - colloids KW - dinsmore KW - elasticity KW - gel KW - journalclub KW - weitz AU - Dinsmore, AD AU - Prasad, V AU - Wong, IY AU - Weitz, DA PY - 2006/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000096000018185502000001&idtype=cvips&gifs=yes ER -

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