Length-Scale-Dependent Relaxation in Colloidal Gels

by: Emanuela Del Gado, Walter Kob

Physical Review Letters, Vol. 98, No. 2. (2007)

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Abstract

We use molecular dynamics computer simulations to investigate the relaxation dynamics of a simple model for a colloidal gel at a low volume fraction. We find that due to the presence of the open spanning network this dynamics shows at low temperature a nontrivial dependence on the wave vector which is very different from the one observed in dense glass-forming liquids. At high wave vectors the relaxation is due to the fast cooperative motion of the branches of the gel network, whereas at low wave vectors the overall rearrangements of the heterogeneous structure produce the relaxation process.

@article{citeulike:2563522, abstract = {We use molecular dynamics computer simulations to investigate the relaxation dynamics of a simple model for a colloidal gel at a low volume fraction. We find that due to the presence of the open spanning network this dynamics shows at low temperature a nontrivial dependence on the wave vector which is very different from the one observed in dense glass-forming liquids. At high wave vectors the relaxation is due to the fast cooperative motion of the branches of the gel network, whereas at low wave vectors the overall rearrangements of the heterogeneous structure produce the relaxation process.}, author = {Del Gado, Emanuela and Kob, Walter }, citeulike-article-id = {2563522}, doi = {10.1103/PhysRevLett.98.028303}, journal = {Physical Review Letters}, keywords = {2007, colloids, gel, relaxation, simulation}, number = {2}, posted-at = {2008-03-19 17:20:02}, priority = {2}, publisher = {APS}, title = {Length-Scale-Dependent Relaxation in Colloidal Gels}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000098000002028303000001\&idtype=cvips\&gifs=yes}, volume = {98}, year = {2007} }

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TY - JOUR ID - citeulike:2563522 TI - Length-Scale-Dependent Relaxation in Colloidal Gels JF - Physical Review Letters VL - 98 IS - 2 PB - APS N2 - We use molecular dynamics computer simulations to investigate the relaxation dynamics of a simple model for a colloidal gel at a low volume fraction. We find that due to the presence of the open spanning network this dynamics shows at low temperature a nontrivial dependence on the wave vector which is very different from the one observed in dense glass-forming liquids. At high wave vectors the relaxation is due to the fast cooperative motion of the branches of the gel network, whereas at low wave vectors the overall rearrangements of the heterogeneous structure produce the relaxation process. KW - 2007 KW - colloids KW - gel KW - relaxation KW - simulation AU - Del Gado, Emanuela AU - Kob, Walter PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000098000002028303000001&idtype=cvips&gifs=yes ER -

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