{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/89066"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/89066","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples","abstract":"Microporosity (<50μm) in hydroxyapatite (HA) scaffolds is known to improve bone ingrowth. The mechanism for the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples that were either 50% or 60% porous with 5μm, 12μm, 20μm or 50μm pores were fabricated. The samples were characterized by imaging the microstructure, analyzing the composition, measuring the pore size, pore fraction, sample thickness and quantifying the defects inside and outside of the samples. Capillary rise tests were conducted on the samples and fluid height curves were obtained as a function of time. A model was implemented to determine the equilibrium heights and calculate the capillary forces. For 50% porous samples, 5μm samples had the highest equilibrium height and capillary pressure, followed by 12μm, 20μm or 50μm samples. The 60% porous 5μm samples had a faster initial rise, but a lower equilibrium height and capillary pressure than the 50% porous 5μm samples. The 60% porous 50μm samples also had a faster initial rise, a lower equilibrium height and capillary pressure than the 50% porous 50μm samples.","abstract_html":"Microporosity (&lt;50μm) in hydroxyapatite (HA) scaffolds is known to improve bone ingrowth. The mechanism for the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples that were either 50% or 60% porous with 5μm, 12μm, 20μm or 50μm pores were fabricated. The samples were characterized by imaging the microstructure, analyzing the composition, measuring the pore size, pore fraction, sample thickness and quantifying the defects inside and outside of the samples. Capillary rise tests were conducted on the samples and fluid height curves were obtained as a function of time. A model was implemented to determine the equilibrium heights and calculate the capillary forces. For 50% porous samples, 5μm samples had the highest equilibrium height and capillary pressure, followed by 12μm, 20μm or 50μm samples. The 60% porous 5μm samples had a faster initial rise, but a lower equilibrium height and capillary pressure than the 50% porous 5μm samples. The 60% porous 50μm samples also had a faster initial rise, a lower equilibrium height and capillary pressure than the 50% porous 50μm samples.","abstract_has_math":false,"creators":["Chen, Szu-Yin"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Johnson Wagoner, Amy"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-02T19:34:32Z","date_published":"2016-03-02T19:34:32Z","updated_at":"2026-07-22T22:26:32Z","subjects":["bone scaffold","hydroxyapatite","Microporosity","capillary pressure","equilibrium height"],"languages":["en"],"rights":["Copyright 2015 Szu-Yin Chen"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/89066","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Johnson Wagoner, Amy"]},{"key":"dc:creator","label":"Author","values":["Chen, Szu-Yin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-03-02T19:34:32Z","2015-12-08","2015-12"]},{"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":["bone scaffold","hydroxyapatite","Microporosity","capillary pressure","equilibrium height"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Szu-Yin Chen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/89066"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Microporosity (<50μm) in hydroxyapatite (HA) scaffolds is known to improve bone ingrowth. The mechanism for the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples that were either 50% or 60% porous with 5μm, 12μm, 20μm or 50μm pores were fabricated. The samples were characterized by imaging the microstructure, analyzing the composition, measuring the pore size, pore fraction, sample thickness and quantifying the defects inside and outside of the samples. Capillary rise tests were conducted on the samples and fluid height curves were obtained as a function of time. A model was implemented to determine the equilibrium heights and calculate the capillary forces. For 50% porous samples, 5μm samples had the highest equilibrium height and capillary pressure, followed by 12μm, 20μm or 50μm samples. The 60% porous 5μm samples had a faster initial rise, but a lower equilibrium height and capillary pressure than the 50% porous 5μm samples. The 60% porous 50μm samples also had a faster initial rise, a lower equilibrium height and capillary pressure than the 50% porous 50μm samples.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Szu-Yin Chen, accepted the attached license on 2015-12-07 at 23:17.","The student, Szu-Yin Chen, submitted this Thesis for approval on 2015-12-07 at 23:39.","This Thesis was approved for publication on 2015-12-08 at 16:51.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8961 on 2016-03-02 at 12:51:48","Made available in DSpace on 2016-03-02T19:34:32Z (GMT). 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Rectangular shaped HA samples that were either 50% or 60% porous with 5μm, 12μm, 20μm or 50μm pores were fabricated. The samples were characterized by imaging the microstructure, analyzing the composition, measuring the pore size, pore fraction, sample thickness and quantifying the defects inside and outside of the samples. Capillary rise tests were conducted on the samples and fluid height curves were obtained as a function of time. A model was implemented to determine the equilibrium heights and calculate the capillary forces. For 50% porous samples, 5μm samples had the highest equilibrium height and capillary pressure, followed by 12μm, 20μm or 50μm samples. The 60% porous 5μm samples had a faster initial rise, but a lower equilibrium height and capillary pressure than the 50% porous 5μm samples. The 60% porous 50μm samples also had a faster initial rise, a lower equilibrium height and capillary pressure than the 50% porous 50μm samples.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Szu-Yin Chen, accepted the attached license on 2015-12-07 at 23:17.","The student, Szu-Yin Chen, submitted this Thesis for approval on 2015-12-07 at 23:39.","This Thesis was approved for publication on 2015-12-08 at 16:51.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8961 on 2016-03-02 at 12:51:48","Made available in DSpace on 2016-03-02T19:34:32Z (GMT). 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