2026-09-25T13:56:38Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/31910 2023-07-10 col_2142_13836 col_2142_5131 com_2142_13835 com_2142_234 com_2142_5130

Rogers, John A. Lu, Chi 2012-06-27T21:00:31Z 2014-06-28T10:00:22Z 2012-05 2012-06-27T21:00:31Z 2012-05 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 Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-24T22:13:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: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 http://hdl.handle.net/2142/31910 en Copy Right 2012 Chi Lu Strain Gauges Hignly Sensitive Elastomer Molding Process Highly sensitive strain gauge based entirely on elastomers via molding process text Materials Science & Engineerng 1919 Materials Science & Engr 0130 University of Illinois at Urbana-Champaign Thesis M.S. MS: MatSE BS/MS program - UIUC 10KS5012MS