{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/69758"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/69758","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"High Pressure Studies of Triphenylmethane Dye Molecules (Photosensitization, Adsorption, Isomerism, Semiconductors, Surfaces)","abstract":"High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the methyl derivative of the dye (crystal violet, CV) on oriented ZnO(0001) semiconductor surfaces. Secondly, optical absorption measurements have been made on the hydrogen, methyl and ethyl derivatives both in solution (to 10 kbar) and dissolved in plastic media (to 150 kbar) to study the effect of pressure on the rotational isomerism of these dye molecules dispersed in the various media.","abstract_html":"High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the methyl derivative of the dye (crystal violet, CV) on oriented ZnO(0001) semiconductor surfaces. Secondly, optical absorption measurements have been made on the hydrogen, methyl and ethyl derivatives both in solution (to 10 kbar) and dissolved in plastic media (to 150 kbar) to study the effect of pressure on the rotational isomerism of these dye molecules dispersed in the various media.","abstract_has_math":false,"creators":["Clark, Frederick Tyson"],"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":"2014-12-15T19:54:24Z","date_published":"2014-12-15T19:54:24Z","updated_at":"2026-07-22T22:26:01Z","subjects":["Engineering, Chemical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8600154"],"render_values":[{"text":"(UMI)AAI8600154","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/69758","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Clark, Frederick Tyson"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T19:54:24Z","10000-01-01","1985"]},{"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/2142/69758","(UMI)AAI8600154"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the methyl derivative of the dye (crystal violet, CV) on oriented ZnO(0001) semiconductor surfaces. Secondly, optical absorption measurements have been made on the hydrogen, methyl and ethyl derivatives both in solution (to 10 kbar) and dissolved in plastic media (to 150 kbar) to study the effect of pressure on the rotational isomerism of these dye molecules dispersed in the various media.","In the photocurrent measurements, similar magnitudes in the red shift with pressure of peaks corresponding to the A and B isomers and the dimer of CV both in the adsorbed and liquid phases are observed, confirming the charge transfer mechanism for the photosensitization process. In addition, the volume change of the system on isomerization and dimerization of the CV monomer in solution and the volume change of the system on adsorption of each species to the ZnO surface are calculated. The results are interpreted to indicate the mode of attachment.","In the optical absorption measurements, three media are used to study the effect of environment on the A and B isomers and on the isomerization process: atactic-PMMA, PC and a buffered aqueous solution. The polymer films are studied in a diamond anvil cell to 150 kbar while the aqueous solution is studied in the liquid state cell to 10 kbar. In these studies, the isomerization process appears to be a sensitive probe of the local structures of these media.","Made available in DSpace on 2014-12-15T19:54:24Z (GMT). No. of bitstreams: 1 8600154.pdf: 3391063 bytes, checksum: 8431360d71a3cda3c62658bcc0d2468c (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 69924 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","122 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."]},{"key":"dc:title","label":"Title","values":["High Pressure Studies of Triphenylmethane Dye Molecules (Photosensitization, Adsorption, Isomerism, Semiconductors, Surfaces)"]}]}],"canonical_facts":{"dc:creator":["Clark, Frederick Tyson"],"dc:date":["2014-12-15T19:54:24Z","10000-01-01","1985"],"dc:description":["High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the methyl derivative of the dye (crystal violet, CV) on oriented ZnO(0001) semiconductor surfaces. Secondly, optical absorption measurements have been made on the hydrogen, methyl and ethyl derivatives both in solution (to 10 kbar) and dissolved in plastic media (to 150 kbar) to study the effect of pressure on the rotational isomerism of these dye molecules dispersed in the various media.","In the photocurrent measurements, similar magnitudes in the red shift with pressure of peaks corresponding to the A and B isomers and the dimer of CV both in the adsorbed and liquid phases are observed, confirming the charge transfer mechanism for the photosensitization process. In addition, the volume change of the system on isomerization and dimerization of the CV monomer in solution and the volume change of the system on adsorption of each species to the ZnO surface are calculated. The results are interpreted to indicate the mode of attachment.","In the optical absorption measurements, three media are used to study the effect of environment on the A and B isomers and on the isomerization process: atactic-PMMA, PC and a buffered aqueous solution. The polymer films are studied in a diamond anvil cell to 150 kbar while the aqueous solution is studied in the liquid state cell to 10 kbar. In these studies, the isomerization process appears to be a sensitive probe of the local structures of these media.","Made available in DSpace on 2014-12-15T19:54:24Z (GMT). No. of bitstreams: 1 8600154.pdf: 3391063 bytes, checksum: 8431360d71a3cda3c62658bcc0d2468c (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 69924 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","122 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."],"dc:identifier":["http://hdl.handle.net/2142/69758","(UMI)AAI8600154"],"dc:subject":["Engineering, Chemical"],"dc:title":["High Pressure Studies of Triphenylmethane Dye Molecules (Photosensitization, Adsorption, Isomerism, Semiconductors, Surfaces)"],"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"}