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Universal aging features in the restructuring of fractal colloidal gels.
MedLine Citation:
PMID:  11017262     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We use multispeckle dynamic light scattering to measure the dynamic structure factor, f(q,tau), of gels formed by aggregation of colloids. Although the gel is an elastic solid, f(q,tau) nearly completely decays on long time scales, with an unusual form, f(q, tau) approximately exp{-(tau/tau(f))(mu)}, with mu approximately 1.5 and with tau(f) proportional variant q(-1). A model for restructuring of the gel with aging correctly accounts for this behavior. Aging leads to a dramatic increase in tau(f); however, all data can be scaled on a single master curve, with tau(f) asymptotically growing linearly with age. This behavior is strikingly similar to that predicted for aging in disordered glassy systems, offering convincing proof of the universality of these concepts.
Authors:
L Cipelletti; S Manley; R C Ball; D A Weitz
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physical review letters     Volume:  84     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2005-02-28     Completed Date:  2005-05-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2275-8     Citation Subset:  -    
Affiliation:
Department of Physics and DEAS, Harvard University, Cambridge, Massachussets 02138, USA.
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