Elasticity and clustering in concentrated depletion gels

S. Ramakrishnan, Y. L. Chen, K. S. Schweizer, C. F. Zukoski

Research output: Contribution to journalArticlepeer-review

Abstract

The volume fraction dependence of the collective structure and elastic moduli of concentrated nanoparticle-polymer depletion gels was investigated using X-ray scattering and rheology. The nonequilibrium gel structure under investigation consisted of locally densified nonfractal clusters and narrow random interfaces. An ultrasmall angle x-ray scattering (USAXS) of nanoparticle collective structure factor was performed over reduced polymer concentrations. An elastic moduli at 1 Hz as a function of volume fraction for fixed reduced polymer concentration was also observed. The results show that the elastic moduli display a power law dependence on volume fraction with effective exponents which decrease with increasing depletion attraction strength.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume70
Issue number4
DOIs
StatePublished - Jan 1 2004

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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