{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/69746"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/69746","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Measurement of Diffusiophoresis in Liquids via a Ternary Diffusion Formulation","abstract":"The phenomenon of diffusiophoresis causes a flux of micron and sub-micron sized particles as the result of the movement of some solute in solution. This phenomenon is quantified for a system of charged polystyrene latex-electrolyte-water.","abstract_html":"The phenomenon of diffusiophoresis causes a flux of micron and sub-micron sized particles as the result of the movement of some solute in solution. This phenomenon is quantified for a system of charged polystyrene latex-electrolyte-water.","abstract_has_math":false,"creators":["Lechnick, William Jay"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-15T19:54:19Z","date_published":"2014-12-15T19:54:19Z","updated_at":"2026-07-22T22:26:01Z","subjects":["Engineering, Chemical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8502214"],"render_values":[{"text":"(UMI)AAI8502214","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/69746","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Lechnick, William Jay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T19:54:19Z","10000-01-01","1984"]},{"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":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/69746","(UMI)AAI8502214"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The phenomenon of diffusiophoresis causes a flux of micron and sub-micron sized particles as the result of the movement of some solute in solution. This phenomenon is quantified for a system of charged polystyrene latex-electrolyte-water.","Diffusiophoresis is modeled as a ternary diffusion effect with the polystyrene cross-term diffusion coefficient (D(,12)) being related to this effect. The ternary diffusion formulation is derived from irreversible thermodynamics. Ternary diffusion coefficients are obtained by means of a modified, high cell constant diaphragm cell.","A pattern search method based on the minimization of residuals is developed for determining ternary diffusion coefficients from diaphragm cell raw data when the cross term diffusivities are large relative to the main term diffusivities. The need for a pattern search method which directly calculates residuals arises because previous methods, which approximate the residuals, are unable to adequately handle systems with dominant cross-term diffusivities.","Studies of various concentrations of polystyrene latex in the presence of 1.25 x 10('-3) M 1:1, 2:1, and 2:2 electrolytes demonstrated that the diffusiophoretic velocity is independent of particle concentration. These studies also demonstrated, via experiment, the existence of two distinct diffusiophoretic effects, diffusion potential and chemiphoresis, as previously predicted by theory. Chemiphoresis is shown to always cause the particle to move toward areas of higher electrolyte concentration and to be the same magnitude for all electrolytes of a particular type while the direction and magnitude of diffusion potential depends upon the charge of the particle and the diffusion characteristics of the ions making up the electrolyte. Simple analytical theories accurately predict the magnitude of the diffusion potential for electrolyte concentrations above 1 x 10('-3) M but overestimate the actual values for electrolyte concentrations below 1 x 10('-3) M. These studies also demonstrated that the chemiphoretic effect is accurately predicted by a previous numerical solution of the Navier-Stokes equation.","Made available in DSpace on 2014-12-15T19:54:19Z (GMT). No. of bitstreams: 1 8502214.pdf: 7930366 bytes, checksum: 226aa2638d465e1405484eac785adb14 (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 69912 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","286 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."]},{"key":"dc:title","label":"Title","values":["Measurement of Diffusiophoresis in Liquids via a Ternary Diffusion Formulation"]}]}],"canonical_facts":{"dc:creator":["Lechnick, William Jay"],"dc:date":["2014-12-15T19:54:19Z","10000-01-01","1984"],"dc:description":["The phenomenon of diffusiophoresis causes a flux of micron and sub-micron sized particles as the result of the movement of some solute in solution. This phenomenon is quantified for a system of charged polystyrene latex-electrolyte-water.","Diffusiophoresis is modeled as a ternary diffusion effect with the polystyrene cross-term diffusion coefficient (D(,12)) being related to this effect. The ternary diffusion formulation is derived from irreversible thermodynamics. Ternary diffusion coefficients are obtained by means of a modified, high cell constant diaphragm cell.","A pattern search method based on the minimization of residuals is developed for determining ternary diffusion coefficients from diaphragm cell raw data when the cross term diffusivities are large relative to the main term diffusivities. The need for a pattern search method which directly calculates residuals arises because previous methods, which approximate the residuals, are unable to adequately handle systems with dominant cross-term diffusivities.","Studies of various concentrations of polystyrene latex in the presence of 1.25 x 10('-3) M 1:1, 2:1, and 2:2 electrolytes demonstrated that the diffusiophoretic velocity is independent of particle concentration. These studies also demonstrated, via experiment, the existence of two distinct diffusiophoretic effects, diffusion potential and chemiphoresis, as previously predicted by theory. Chemiphoresis is shown to always cause the particle to move toward areas of higher electrolyte concentration and to be the same magnitude for all electrolytes of a particular type while the direction and magnitude of diffusion potential depends upon the charge of the particle and the diffusion characteristics of the ions making up the electrolyte. Simple analytical theories accurately predict the magnitude of the diffusion potential for electrolyte concentrations above 1 x 10('-3) M but overestimate the actual values for electrolyte concentrations below 1 x 10('-3) M. These studies also demonstrated that the chemiphoretic effect is accurately predicted by a previous numerical solution of the Navier-Stokes equation.","Made available in DSpace on 2014-12-15T19:54:19Z (GMT). No. of bitstreams: 1 8502214.pdf: 7930366 bytes, checksum: 226aa2638d465e1405484eac785adb14 (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 69912 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","286 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."],"dc:identifier":["http://hdl.handle.net/2142/69746","(UMI)AAI8502214"],"dc:subject":["Engineering, Chemical"],"dc:title":["Measurement of Diffusiophoresis in Liquids via a Ternary Diffusion Formulation"],"dc:type":["text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:01Z"}