{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19389"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19389","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The electrostatic polarization mechanism of the electrorheological response","abstract":"The electrorheological (ER) response is the dramatic and reversible change in the rheological properties of a suspension due to the application of an external electric field. Many applications of this technology in stress transfer devices are possible, but development of these devices is currently limited by a lack of understanding of the fundamental mechanisms. In this dissertation, the mechanisms controlling ER response are investigated.","abstract_html":"The electrorheological (ER) response is the dramatic and reversible change in the rheological properties of a suspension due to the application of an external electric field. Many applications of this technology in stress transfer devices are possible, but development of these devices is currently limited by a lack of understanding of the fundamental mechanisms. In this dissertation, the mechanisms controlling ER response are investigated.","abstract_has_math":false,"creators":["Klingenberg, Daniel Joseph"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["Zukoski, Charles F."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:06:03Z","date_published":"2011-05-07T12:06:03Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Engineering, Chemical"],"languages":["eng"],"rights":["Copyright 1991 Klingenberg, Daniel Joseph"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124444","(UMI)AAI9124444"],"render_values":[{"text":"AAI9124444","href":null,"code":true},{"text":"(UMI)AAI9124444","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19389","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Zukoski, Charles F."]},{"key":"dc:creator","label":"Author","values":["Klingenberg, Daniel Joseph"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:06:03Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Chemical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Klingenberg, Daniel Joseph"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124444","(UMI)AAI9124444","http://hdl.handle.net/2142/19389"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The electrorheological (ER) response is the dramatic and reversible change in the rheological properties of a suspension due to the application of an external electric field. Many applications of this technology in stress transfer devices are possible, but development of these devices is currently limited by a lack of understanding of the fundamental mechanisms. In this dissertation, the mechanisms controlling ER response are investigated.","ER suspensions were modelled as monodisperse suspensions of hard, dielectric spheres in a Newtonian continuous phase. A molecular dynamics-like simulation technique was developed to study the behavior of this model system. Simulation of structure formation in stagnant suspensions reproduced the dominant features observed experimentally, and indicated that the response time is a sensitive function of the concentration of the disperse phase. It was shown that for concentrated suspensions and for electric field strengths $\\sim$1 kV/mm, the response time is on the order of milliseconds.","Simulation of sheared ER suspensions predicted a dynamic yield stress that saturated above a critical volume fraction. This was shown to result from a transition in the suspension structure from fibers at small concentrations to dense clusters at large concentrations. Experiments performed on a model ER suspension confirmed the prediction of a plateau in the yield stress at large concentrations.","Incorporation of multipole and multibody electrostatic interactions between spheres demonstrated the sensitivity of the ER response to the dielectric properties of the phases. The ER response was also found to be sensitive to the details of the short-range repulsive forces. Optimization of these properties makes possible large values for the dynamic yield stress in ER suspensions--$\\sim$1 kPa at 1 kV/mm.","Made available in DSpace on 2011-05-07T12:06:03Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124444.pdf: 8750340 bytes, checksum: d892a74a745a8229228a9823241b6670 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:36:37Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:51-05:00 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"]},{"key":"dc:title","label":"Title","values":["The electrostatic polarization mechanism of the electrorheological response"]}]}],"canonical_facts":{"dc:contributor":["Zukoski, Charles F."],"dc:creator":["Klingenberg, Daniel Joseph"],"dc:date":["2011-05-07T12:06:03Z","10000-01-01","1991"],"dc:description":["The electrorheological (ER) response is the dramatic and reversible change in the rheological properties of a suspension due to the application of an external electric field. Many applications of this technology in stress transfer devices are possible, but development of these devices is currently limited by a lack of understanding of the fundamental mechanisms. In this dissertation, the mechanisms controlling ER response are investigated.","ER suspensions were modelled as monodisperse suspensions of hard, dielectric spheres in a Newtonian continuous phase. A molecular dynamics-like simulation technique was developed to study the behavior of this model system. Simulation of structure formation in stagnant suspensions reproduced the dominant features observed experimentally, and indicated that the response time is a sensitive function of the concentration of the disperse phase. It was shown that for concentrated suspensions and for electric field strengths $\\sim$1 kV/mm, the response time is on the order of milliseconds.","Simulation of sheared ER suspensions predicted a dynamic yield stress that saturated above a critical volume fraction. This was shown to result from a transition in the suspension structure from fibers at small concentrations to dense clusters at large concentrations. Experiments performed on a model ER suspension confirmed the prediction of a plateau in the yield stress at large concentrations.","Incorporation of multipole and multibody electrostatic interactions between spheres demonstrated the sensitivity of the ER response to the dielectric properties of the phases. The ER response was also found to be sensitive to the details of the short-range repulsive forces. Optimization of these properties makes possible large values for the dynamic yield stress in ER suspensions--$\\sim$1 kPa at 1 kV/mm.","Made available in DSpace on 2011-05-07T12:06:03Z (GMT). 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