Elasticity and clustering in concentrated depletion gels

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

doi:10.1103/PhysRevE.70.040401

Elasticity and clustering in concentrated depletion gels

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

Research output: Contribution to journal › Article › peer-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 language	English (US)
Number of pages	1
Journal	Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume	70
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevE.70.040401
State	Published - Jan 1 2004

ASJC Scopus subject areas

Statistical and Nonlinear Physics
Statistics and Probability
Condensed Matter Physics

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AB - 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.

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Elasticity and clustering in concentrated depletion gels

Abstract

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