{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/73107"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/73107","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Design and manufacturing of PDMS micro structures with dynamic inclination angle","abstract":"State-of-the art microfabrication techniques enable new understanding of surface phenomena such as liquid wetting and dry adhesion. This understanding led to a surge of design and fabrication of novel non- and directional wetting, self-cleaning, anti-biofouling and energy efficient surface textures. This work focuses on designing new dynamic surfaces that can change their micro and nanoscale texture due to in-plane mechanical strain. The studied textured surfaces have vertical 1D nanostructures, such as carbon nanotubes, integrated on flexible carrier films with inclined angle-tunable microstructures. An example of hierarchical geometry is proposed and fabricated using a double-molding technique. Finite Element Analysis shows that the nanostructure angle can be tuned from –45 to +40 degrees while the space among their periodicity changes by 320% due to in-plane tensile film strain. Two types of molds are designed and fabricated: inclined wavy surface features fabricated with stereolithography with periodicity of 250 microns and kinematically coupled alignment grooves; tilted SU8 microstructures with periodicity of 50 microns made by inclined photolithography. Both molds were used to cast films of 100 micron thickness from polydimethyl siloxane (PDMS); and releasing the film was achieved using a sacrificial mold coating of 300 nm thick PMMA. With PDMS thin films bearing arrays of nanostructures with tunable angles, these surfaces can change surface roughness by external stimuli; for instance, by applied mechanical strain, further change a wide range of optical, wetting, adhesive and other surface properties. In other words, the strategy here is not only with reversible surface properties but also can be triggered by a wide range of stimuli.","abstract_html":"State-of-the art microfabrication techniques enable new understanding of surface phenomena such as liquid wetting and dry adhesion. This understanding led to a surge of design and fabrication of novel non- and directional wetting, self-cleaning, anti-biofouling and energy efficient surface textures. This work focuses on designing new dynamic surfaces that can change their micro and nanoscale texture due to in-plane mechanical strain. The studied textured surfaces have vertical 1D nanostructures, such as carbon nanotubes, integrated on flexible carrier films with inclined angle-tunable microstructures. An example of hierarchical geometry is proposed and fabricated using a double-molding technique. Finite Element Analysis shows that the nanostructure angle can be tuned from –45 to +40 degrees while the space among their periodicity changes by 320% due to in-plane tensile film strain. Two types of molds are designed and fabricated: inclined wavy surface features fabricated with stereolithography with periodicity of 250 microns and kinematically coupled alignment grooves; tilted SU8 microstructures with periodicity of 50 microns made by inclined photolithography. Both molds were used to cast films of 100 micron thickness from polydimethyl siloxane (PDMS); and releasing the film was achieved using a sacrificial mold coating of 300 nm thick PMMA. With PDMS thin films bearing arrays of nanostructures with tunable angles, these surfaces can change surface roughness by external stimuli; for instance, by applied mechanical strain, further change a wide range of optical, wetting, adhesive and other surface properties. In other words, the strategy here is not only with reversible surface properties but also can be triggered by a wide range of stimuli.","abstract_has_math":false,"creators":["Chen, Ping-Ju"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Tawfick, Sameh"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-01-21T19:59:34Z","date_published":"2015-01-21T19:59:34Z","updated_at":"2026-07-22T22:26:07Z","subjects":["Dynamic Surfaces","Anisotropy","Asymmetry wavy surfaces","polydimethyl siloxane (PDMS)","wetting"],"languages":["en"],"rights":["Copyright 2014 Pingju Chen"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/73107","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tawfick, Sameh"]},{"key":"dc:creator","label":"Author","values":["Chen, Ping-Ju"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-01-21T19:59:34Z","2017-01-22T10:15:40Z","2014-12","2015-01-21"]},{"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":["Dynamic Surfaces","Anisotropy","Asymmetry wavy surfaces","polydimethyl siloxane (PDMS)","wetting"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2014 Pingju Chen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/73107"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["State-of-the art microfabrication techniques enable new understanding of surface phenomena such as liquid wetting and dry adhesion. 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Two types of molds are designed and fabricated: inclined wavy surface features fabricated with stereolithography with periodicity of 250 microns and kinematically coupled alignment grooves; tilted SU8 microstructures with periodicity of 50 microns made by inclined photolithography. Both molds were used to cast films of 100 micron thickness from polydimethyl siloxane (PDMS); and releasing the film was achieved using a sacrificial mold coating of 300 nm thick PMMA. With PDMS thin films bearing arrays of nanostructures with tunable angles, these surfaces can change surface roughness by external stimuli; for instance, by applied mechanical strain, further change a wide range of optical, wetting, adhesive and other surface properties. 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Two types of molds are designed and fabricated: inclined wavy surface features fabricated with stereolithography with periodicity of 250 microns and kinematically coupled alignment grooves; tilted SU8 microstructures with periodicity of 50 microns made by inclined photolithography. Both molds were used to cast films of 100 micron thickness from polydimethyl siloxane (PDMS); and releasing the film was achieved using a sacrificial mold coating of 300 nm thick PMMA. With PDMS thin films bearing arrays of nanostructures with tunable angles, these surfaces can change surface roughness by external stimuli; for instance, by applied mechanical strain, further change a wide range of optical, wetting, adhesive and other surface properties. 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