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oai:www.ideals.illinois.edu:2142/11616 2023-07-10 col_2142_11615 col_2142_5131 col_2142_9 com_2142_9130 com_2142_8903 com_2142_5130 com_2142_8

Higdon, Jonathan J.L. Schweizer, Kenneth S. Kong, Hyun Joon Schroeder, Charles M. Bybee, Michael Dean 2009-04-27T20:27:34Z 2009-04-27T20:27:34Z 2009-04 The microstructure, dynamics, and rheology of colloidal suspensions with short-range depletion attraction and long-range electrostatic repulsion are studied using equilibrium predictions and a new algorithm for dynamic simulations. A focus is made on those combinations of attraction and repulsion that lead to the formation of gels. The effects of varying the strength of attraction (0–50kT), range of attraction (0.05–0.18a), strength of repulsion (0–54kT), and volume fraction (0.1–0.4) are investigated, where k is Boltzmann’s constant, T is the temperature, and a is the colloid radius. Hard-sphere thermodynamic perturbation theory is employed to predict equilibrium behavior. A new algorithm called Fast Lubrication Dynamics (FLD) is developed as part of this work and enables dynamic simulations including the effects of many-body hydrodynamic interactions, Brownian motion, and interparticle interactions at a speed more than 100 times faster than Stokesian Dynamics (SD) while retaining much of the relevant physics of SD. In addition, FLD is found to be nearly as fast as Brownian Dynamics (BD) due to the larger time steps allowed by FLD. The results of FLD simulations are compared with those of BD simulations as well as experimental results. not peer reviewed Submitted by Michael Bybee (bybee@illinois.edu) on 2009-04-27T20:08:00Z No. of bitstreams: 1 Dissertation.pdf: 10400637 bytes, checksum: ddf1b7fe0d3a943dd5f444c8dbff946d (MD5) Approved for entry into archive by Sarah Shreeves(sshreeve@illinois.edu) on 2009-04-27T20:27:34Z (GMT) No. of bitstreams: 1 Dissertation.pdf: 10400637 bytes, checksum: ddf1b7fe0d3a943dd5f444c8dbff946d (MD5) Made available in DSpace on 2009-04-27T20:27:34Z (GMT). No. of bitstreams: 1 Dissertation.pdf: 10400637 bytes, checksum: ddf1b7fe0d3a943dd5f444c8dbff946d (MD5) Previous issue date: 2009-04 Department of Energy, DE-FG02-97ER25308 unpublished Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemical and Biomolecular Engineering in the Graduate College of the University of Illinois at Urbana-Champaign, 2009 http://hdl.handle.net/2142/11616 en colloidal suspension colloidal gel numerical simulation hydrodynamic interaction Hydrodynamic Simulations of Colloidal Gels: Microstructure, Dynamics, and Rheology Dissertation / Thesis text Chemical and Biomolecular Engineering Chemical and Biomolecular Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.