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The Equilibrium Properties and Microstructure of Mixtures of Colloidal Particles with Long-Range, Soft Repulsions.
MedLine Citation:
PMID:  9929420     Owner:  NLM     Status:  Publisher    
Osmotic pressure and elastic moduli of bimodal suspensions of particles experiencing long-range, soft repulsions were measured. At fixed osmotic pressure, the total suspension volume fraction, φ, varies linearly as the mixing ratio φl/φ is increased from 0 to 1. Here φl is the volume fraction of large particles based on total suspension volume. This result suggests the suspensions studied here are phase separated into domains containing primarily small and primarily large particles and is not expected for hard sphere suspensions where, at fixed osmotic pressure, φ passes through a maximum as φl/φ is increased. Elastic moduli are well described by a model based on a composite microstructure where the domains of pure large and small particles must have the same osmotic pressure which fixes the local particle volume fraction and hence the elastic modulus in each phase. The existence of phase separation is supported by electron micrographs taken on samples prepared by rapidly drying suspensions with volume fractions near 0.6. Copyright 1999 Academic Press.
Hunt; Zukoski
Publication Detail:
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  210     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  1999 Feb 
Date Detail:
Created Date:  1999-02-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  332-342     Citation Subset:  -    
Department of Chemical Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801
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