{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83369"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83369","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)","abstract":"\"Hence, NOM aggregation was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different mechanisms of NOM aggregation. Calcium ions connect NOM molecules by co-complexation, forming linearly-shaped NOM aggregates. On the other hand, simulation results with magnesium and sodium are more consistent with a \"\"salting-out\"\", wherein the ions may promote more compact and spherically-shaped NOM clusters.\"","abstract_html":""Hence, NOM aggregation was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different mechanisms of NOM aggregation. Calcium ions connect NOM molecules by co-complexation, forming linearly-shaped NOM aggregates. On the other hand, simulation results with magnesium and sodium are more consistent with a ""salting-out"", wherein the ions may promote more compact and spherically-shaped NOM clusters."","abstract_has_math":false,"creators":["Ahn, Won-Young"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civl and Environmental Engineering","degree_department":null,"school":null,"contributors":["Clark, Mark M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:04:33Z","date_published":"2015-09-25T21:04:33Z","updated_at":"2026-07-22T22:26:21Z","subjects":["Environmental Sciences"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3314716"],"render_values":[{"text":"(MiAaPQ)AAI3314716","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83369","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Clark, Mark M."]},{"key":"dc:creator","label":"Author","values":["Ahn, Won-Young"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T21:04:33Z","10000-01-01","2008"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civl and Environmental 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":["Environmental Sciences"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/83369","(MiAaPQ)AAI3314716"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"Hence, NOM aggregation was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different mechanisms of NOM aggregation. Calcium ions connect NOM molecules by co-complexation, forming linearly-shaped NOM aggregates. On the other hand, simulation results with magnesium and sodium are more consistent with a \"\"salting-out\"\", wherein the ions may promote more compact and spherically-shaped NOM clusters.\"","Made available in DSpace on 2015-09-25T21:04:33Z (GMT). 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These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different mechanisms of NOM aggregation. Calcium ions connect NOM molecules by co-complexation, forming linearly-shaped NOM aggregates. On the other hand, simulation results with magnesium and sodium are more consistent with a \"\"salting-out\"\", wherein the ions may promote more compact and spherically-shaped NOM clusters.\"","Made available in DSpace on 2015-09-25T21:04:33Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3314716.pdf: 1964087 bytes, checksum: f02f307533ee694a6fd2638a7baf04a4 (MD5) Previous issue date: 2008","Embargo set by: Seth Robbins for item 84650 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","135 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008."],"dc:identifier":["http://hdl.handle.net/2142/83369","(MiAaPQ)AAI3314716"],"dc:language":["eng"],"dc:subject":["Environmental Sciences"],"dc:title":["Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)"],"dc:type":["text"],"thesis:degree_discipline":["Civl and Environmental Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:21Z"}