{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101233"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101233","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Surface mechanics of polyacrylamide hydrogels following wear","abstract":"In this work, the changes in elasticity of synthetic hydrogel surfaces following deliberate abrasive surface wear are measured. These polyacrylamide hydrogels – cross-linked polymers consisting of 92% water by mass – undergo surface wear, and their surface elastic properties before and after wear are measured. Quasi-static nanoindentations are performed on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are recoverable, and after several days of resting underwater, the hydrogel’s surface stiffness characteristics return to similar values as before any wear is applied. From this, it can be deduced that wear removes a soft, swollen surface layer and reveals a stiffer bulk. Surfaces can undergo further wear and re-swell successfully with every repetition of the experiment. This research in surface mechanics of hydrogels after applied surface wear is applicable to load-bearing hydrogel surfaces in the human body.","abstract_html":"In this work, the changes in elasticity of synthetic hydrogel surfaces following deliberate abrasive surface wear are measured. These polyacrylamide hydrogels – cross-linked polymers consisting of 92% water by mass – undergo surface wear, and their surface elastic properties before and after wear are measured. Quasi-static nanoindentations are performed on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are recoverable, and after several days of resting underwater, the hydrogel’s surface stiffness characteristics return to similar values as before any wear is applied. From this, it can be deduced that wear removes a soft, swollen surface layer and reveals a stiffer bulk. Surfaces can undergo further wear and re-swell successfully with every repetition of the experiment. This research in surface mechanics of hydrogels after applied surface wear is applicable to load-bearing hydrogel surfaces in the human body.","abstract_has_math":false,"creators":["Atten, Michael Thomas"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Dunn, Alison C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-04T20:41:58Z","date_published":"2018-09-04T20:41:58Z","updated_at":"2026-07-22T22:24:38Z","subjects":["Polyacrylamide hydrogels","wear","surface mechanics","longitudinal wear","stiffness","regenerating surfaces","AFM","nanoindentation"],"languages":["en"],"rights":["Copyright 2018 Michael Atten"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101233","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dunn, Alison C."]},{"key":"dc:creator","label":"Author","values":["Atten, Michael Thomas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-04T20:41:58Z","2020-09-05T09:15:23Z","2018-04-26","2018-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["Polyacrylamide hydrogels","wear","surface mechanics","longitudinal wear","stiffness","regenerating surfaces","AFM","nanoindentation"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Michael Atten"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101233"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this work, the changes in elasticity of synthetic hydrogel surfaces following deliberate abrasive surface wear are measured. These polyacrylamide hydrogels – cross-linked polymers consisting of 92% water by mass – undergo surface wear, and their surface elastic properties before and after wear are measured. Quasi-static nanoindentations are performed on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are recoverable, and after several days of resting underwater, the hydrogel’s surface stiffness characteristics return to similar values as before any wear is applied. From this, it can be deduced that wear removes a soft, swollen surface layer and reveals a stiffer bulk. Surfaces can undergo further wear and re-swell successfully with every repetition of the experiment. This research in surface mechanics of hydrogels after applied surface wear is applicable to load-bearing hydrogel surfaces in the human body.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Michael Atten, accepted the attached license on 2018-04-25 at 22:57.","The student, Michael Atten, submitted this Thesis for approval on 2018-04-25 at 23:07.","This Thesis was approved for publication on 2018-04-26 at 11:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12512 on 2018-08-31 at 17:21:38","Made available in DSpace on 2018-09-04T20:41:58Z (GMT). No. of bitstreams: 2 ATTEN-THESIS-2018.pdf: 1173252 bytes, checksum: 10440be418b728b56da0b44547b501f0 (MD5) LICENSE.txt: 4210 bytes, checksum: de9600da321fc9978993dbf479941584 (MD5) Previous issue date: 2018-04-26","Embargo set by: Seth Robbins for item 107318 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107318 on 2020-09-05T09:15:23Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Surface mechanics of polyacrylamide hydrogels following wear"]}]}],"canonical_facts":{"dc:contributor":["Dunn, Alison C."],"dc:creator":["Atten, Michael Thomas"],"dc:date":["2018-09-04T20:41:58Z","2020-09-05T09:15:23Z","2018-04-26","2018-05"],"dc:description":["In this work, the changes in elasticity of synthetic hydrogel surfaces following deliberate abrasive surface wear are measured. These polyacrylamide hydrogels – cross-linked polymers consisting of 92% water by mass – undergo surface wear, and their surface elastic properties before and after wear are measured. Quasi-static nanoindentations are performed on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are recoverable, and after several days of resting underwater, the hydrogel’s surface stiffness characteristics return to similar values as before any wear is applied. From this, it can be deduced that wear removes a soft, swollen surface layer and reveals a stiffer bulk. Surfaces can undergo further wear and re-swell successfully with every repetition of the experiment. This research in surface mechanics of hydrogels after applied surface wear is applicable to load-bearing hydrogel surfaces in the human body.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Michael Atten, accepted the attached license on 2018-04-25 at 22:57.","The student, Michael Atten, submitted this Thesis for approval on 2018-04-25 at 23:07.","This Thesis was approved for publication on 2018-04-26 at 11:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12512 on 2018-08-31 at 17:21:38","Made available in DSpace on 2018-09-04T20:41:58Z (GMT). No. of bitstreams: 2 ATTEN-THESIS-2018.pdf: 1173252 bytes, checksum: 10440be418b728b56da0b44547b501f0 (MD5) LICENSE.txt: 4210 bytes, checksum: de9600da321fc9978993dbf479941584 (MD5) Previous issue date: 2018-04-26","Embargo set by: Seth Robbins for item 107318 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107318 on 2020-09-05T09:15:23Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101233"],"dc:language":["en"],"dc:rights":["Copyright 2018 Michael Atten"],"dc:subject":["Polyacrylamide hydrogels","wear","surface mechanics","longitudinal wear","stiffness","regenerating surfaces","AFM","nanoindentation"],"dc:title":["Surface mechanics of polyacrylamide hydrogels following wear"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:38Z"}