{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/31910"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/31910","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Highly sensitive strain gauge based entirely on elastomers via molding process","abstract":"This thesis is mainly about the research on highly sensitive strain gauges based entirely on elastomers and partially about the molding process which is used to fabricate the strain gauge and pattern poly-dimethylsiloxane (PDMS). In this thesis, I demonstrate the design, fabrication and characterization of high gauge factor (GF), all-elastomer strain gauge systems, with Young’s modulus of 224 kPa, which lies within the range of the human epidermis. The devices combine carbon black doped-PDMS resistors, carbon nanotube doped-PDMS conductors and an insulating PDMS matrix/substrate to yield, in mechanically optimized geometrical layouts, desired characteristics. Measurement of strains in human skin using sensor sheets of this type, physically laminated onto the wrist, illustrates a representative implementation. Strains measured in this mode on the wrist are between 11.2% and 22.6%. Such sheets can be readily laminated on and form conformal contact to the human skin, with only modest mechanical constraints on natural motions. Moreover, the devices remain attached even under full-range bending of the joint, with minimal effects of mechanical constraint or mass loading. The approach I used to pattern the conductive PDMS is molding and scrapping. Molding process can not only be used to pattern conductive PDMS but also regular PDMS. For example, skin-like PDMS sheet with an array of hollows will be discussed later in the thesis.","abstract_html":"This thesis is mainly about the research on highly sensitive strain gauges based entirely on elastomers and partially about the molding process which is used to fabricate the strain gauge and pattern poly-dimethylsiloxane (PDMS). In this thesis, I demonstrate the design, fabrication and characterization of high gauge factor (GF), all-elastomer strain gauge systems, with Young’s modulus of 224 kPa, which lies within the range of the human epidermis. The devices combine carbon black doped-PDMS resistors, carbon nanotube doped-PDMS conductors and an insulating PDMS matrix/substrate to yield, in mechanically optimized geometrical layouts, desired characteristics. Measurement of strains in human skin using sensor sheets of this type, physically laminated onto the wrist, illustrates a representative implementation. Strains measured in this mode on the wrist are between 11.2% and 22.6%. Such sheets can be readily laminated on and form conformal contact to the human skin, with only modest mechanical constraints on natural motions. Moreover, the devices remain attached even under full-range bending of the joint, with minimal effects of mechanical constraint or mass loading. The approach I used to pattern the conductive PDMS is molding and scrapping. Molding process can not only be used to pattern conductive PDMS but also regular PDMS. For example, skin-like PDMS sheet with an array of hollows will be discussed later in the thesis.","abstract_has_math":false,"creators":["Lu, Chi"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Rogers, John A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-06-27T21:00:31Z","date_published":"2012-06-27T21:00:31Z","updated_at":"2026-07-22T22:25:30Z","subjects":["Strain Gauges","Hignly Sensitive","Elastomer","Molding Process"],"languages":["en"],"rights":["Copy Right 2012 Chi Lu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/31910","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rogers, John A."]},{"key":"dc:creator","label":"Author","values":["Lu, Chi"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-06-27T21:00:31Z","2014-06-28T10:00:22Z","2012-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & Engr"]},{"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":["Strain Gauges","Hignly Sensitive","Elastomer","Molding Process"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copy Right 2012 Chi Lu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/31910"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis is mainly about the research on highly sensitive strain gauges based entirely on elastomers and partially about the molding process which is used to fabricate the strain gauge and pattern poly-dimethylsiloxane (PDMS). In this thesis, I demonstrate the design, fabrication and characterization of high gauge factor (GF), all-elastomer strain gauge systems, with Young’s modulus of 224 kPa, which lies within the range of the human epidermis. The devices combine carbon black doped-PDMS resistors, carbon nanotube doped-PDMS conductors and an insulating PDMS matrix/substrate to yield, in mechanically optimized geometrical layouts, desired characteristics. Measurement of strains in human skin using sensor sheets of this type, physically laminated onto the wrist, illustrates a representative implementation. Strains measured in this mode on the wrist are between 11.2% and 22.6%. Such sheets can be readily laminated on and form conformal contact to the human skin, with only modest mechanical constraints on natural motions. Moreover, the devices remain attached even under full-range bending of the joint, with minimal effects of mechanical constraint or mass loading. The approach I used to pattern the conductive PDMS is molding and scrapping. Molding process can not only be used to pattern conductive PDMS but also regular PDMS. For example, skin-like PDMS sheet with an array of hollows will be discussed later in the thesis.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-24T22:13:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 MasterThesis_ChiLu.docx: 2360331 bytes, checksum: bbd89e6dadd146fbba7554dbe98634bc (MD5) Lu_Chi.pdf: 1268649 bytes, checksum: c148ea5f97a2a74741261679caadde90 (MD5)","Made available in DSpace on 2012-06-27T21:00:31Z (GMT). No. of bitstreams: 3 Lu_Chi.pdf: 1268901 bytes, checksum: 7b4a0f84cb901d3a3ef257b6596bd860 (MD5) MasterThesis_ChiLu.docx: 2361261 bytes, checksum: 9b4ff5ca5b5fbda1ce8e73e6d7bedc38 (MD5) license.txt: 4054 bytes, checksum: 1046dc9eea460eeba0cfc7d9440f1895 (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-06-27T21:02:02Z Item is restricted until 2014-06-27T21:02:02Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:22Z Item was in collections: Dissertations and Theses - Materials Science and Engineering (ID: 649) Graduate Theses and Dissertations at Illinois (ID: 204) Dissertations and Theses - Materials Science and Engineering (ID: 649) No. of bitstreams: 3 Lu_Chi.pdf: 1268901 bytes, checksum: 7b4a0f84cb901d3a3ef257b6596bd860 (MD5) MasterThesis_ChiLu.docx: 2361261 bytes, checksum: 9b4ff5ca5b5fbda1ce8e73e6d7bedc38 (MD5) license.txt: 4054 bytes, checksum: 1046dc9eea460eeba0cfc7d9440f1895 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:22Z"]},{"key":"dc:title","label":"Title","values":["Highly sensitive strain gauge based entirely on elastomers via molding process"]}]}],"canonical_facts":{"dc:contributor":["Rogers, John A."],"dc:creator":["Lu, Chi"],"dc:date":["2012-06-27T21:00:31Z","2014-06-28T10:00:22Z","2012-05"],"dc:description":["This thesis is mainly about the research on highly sensitive strain gauges based entirely on elastomers and partially about the molding process which is used to fabricate the strain gauge and pattern poly-dimethylsiloxane (PDMS). In this thesis, I demonstrate the design, fabrication and characterization of high gauge factor (GF), all-elastomer strain gauge systems, with Young’s modulus of 224 kPa, which lies within the range of the human epidermis. The devices combine carbon black doped-PDMS resistors, carbon nanotube doped-PDMS conductors and an insulating PDMS matrix/substrate to yield, in mechanically optimized geometrical layouts, desired characteristics. Measurement of strains in human skin using sensor sheets of this type, physically laminated onto the wrist, illustrates a representative implementation. Strains measured in this mode on the wrist are between 11.2% and 22.6%. Such sheets can be readily laminated on and form conformal contact to the human skin, with only modest mechanical constraints on natural motions. Moreover, the devices remain attached even under full-range bending of the joint, with minimal effects of mechanical constraint or mass loading. The approach I used to pattern the conductive PDMS is molding and scrapping. Molding process can not only be used to pattern conductive PDMS but also regular PDMS. For example, skin-like PDMS sheet with an array of hollows will be discussed later in the thesis.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-24T22:13:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 MasterThesis_ChiLu.docx: 2360331 bytes, checksum: bbd89e6dadd146fbba7554dbe98634bc (MD5) Lu_Chi.pdf: 1268649 bytes, checksum: c148ea5f97a2a74741261679caadde90 (MD5)","Made available in DSpace on 2012-06-27T21:00:31Z (GMT). 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