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Zukoski, Charles F. Hug, John Eric 2011-05-07T12:29:33Z 2011-05-07T12:29:33Z 10000-01-01 1995 Rheological properties and microstructures of concentrated charge-stabilized suspensions confined to gap sizes on the order of a few particle diameters are investigated by molecular dynamics computer simulations. Suspensions of uniform spheres at volume fractions ranging from 0.28 to 0.53 covering the crystalline phase are studied. The suspensions are modeled as spheres interacting via a repulsive short-ranged electrostatic potential. Stress versus shear rate behavior is examined as a function of particle volume fraction, gap size, and shear history. Microstructures for systems at equilibrium and under shear are investigated by direct observation of particle configurations and by scattering patterns generated from structure factor calculations. The observed shear behavior and microstructures compare favorably with experimental shear studies of bulk colloidal suspensions. The shear response and stresses marking rheological transitions scale on the equilibrium modulus in a universal manner. Small changes in gap size result in significant differences in the equilibrium properties which in turn can affect the observed rheological response. Gap size also plays an important role at shear rates where catastrophic shear thinning and shear thickening occur. Qualitative differences in shear behavior between experiments and simulations are observed at high shear rates suggesting that particle interactions dominate the shear behavior at low shear rates and hydrodynamics becomes important at high shear rates. Made available in DSpace on 2011-05-07T12:29:33Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9522120.pdf: 8478649 bytes, checksum: 3325e69c9bbc262a2dc540fed5c8a751 (MD5) Previous issue date: 1995 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:41:43Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:18:05-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9522120 (UMI)AAI9522120 http://hdl.handle.net/2142/20124 eng Copyright 1995 Hug, John Eric Engineering, Chemical Engineering, Materials Science Shear behavior and microstructures of confined colloidal suspensions text Chemical and Biomolecular Engineering Chemical Engineering Engineering, Materials Science University of Illinois at Urbana-Champaign Dissertation Ph.D.