{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/32077"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/32077","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Storage and transport of energy in nanostructures","abstract":"Nanostructures typically exhibit thermo-physical properties that are different from their bulk counterparts. The size dependence of thermo physical properties is attributed to changing energy and mass transport phenomenon with varying length scales. This size dependence can be profitably leveraged to build cheap and efficient energy storage and harvesting systems when the materials are highly abundant. In this thesis, we study two different materials which exhibit favorable properties at lower length scales. In the first case, we study the dependence of particle size on energy storage and Carbon dioxide absorption capability of Calcium oxide particles. We theoretically establish in this work that the CaO nanoparticles achieve higher and faster reaction conversions than the micrometer sized particles. We identify the parameters which contribute to the superior performance of CaO nanoparticles and thereby provide design recommendations to sustain the enhanced performance. In the second case, Silicon, another abundant material, in the form of a nanowire has been experimentally examined as a candidate material for thermoelectric applications to harvest waste heat. We designed and fabricated a device to gauge the thermoelectric figure of merit of nano-structured materials by simultaneous characterization of thermal, electrical and seebeck properties. Using the fabricated device, the silicon nanowires are shown to have a tenfold reduction in thermal conductivity from its bulk value thereby establishing silicon nanowires as a promising thermoelectric material.","abstract_html":"Nanostructures typically exhibit thermo-physical properties that are different from their bulk counterparts. The size dependence of thermo physical properties is attributed to changing energy and mass transport phenomenon with varying length scales. This size dependence can be profitably leveraged to build cheap and efficient energy storage and harvesting systems when the materials are highly abundant. In this thesis, we study two different materials which exhibit favorable properties at lower length scales. In the first case, we study the dependence of particle size on energy storage and Carbon dioxide absorption capability of Calcium oxide particles. We theoretically establish in this work that the CaO nanoparticles achieve higher and faster reaction conversions than the micrometer sized particles. We identify the parameters which contribute to the superior performance of CaO nanoparticles and thereby provide design recommendations to sustain the enhanced performance. In the second case, Silicon, another abundant material, in the form of a nanowire has been experimentally examined as a candidate material for thermoelectric applications to harvest waste heat. We designed and fabricated a device to gauge the thermoelectric figure of merit of nano-structured materials by simultaneous characterization of thermal, electrical and seebeck properties. Using the fabricated device, the silicon nanowires are shown to have a tenfold reduction in thermal conductivity from its bulk value thereby establishing silicon nanowires as a promising thermoelectric material.","abstract_has_math":false,"creators":["Valavala, Krishna Vasanth"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Sinha, Sanjiv"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-06-27T21:31:53Z","date_published":"2012-06-27T21:31:53Z","updated_at":"2026-07-22T22:25:30Z","subjects":["Carbonation","nanoparticle","Calcium Oxide","Carbon dioxide","absorption","sequestration","random pore model","shrinking core model","silicon","single nanowire","thermoelectrics","thermal conductivity","measurement"],"languages":["en"],"rights":["Copyright 2012 Krishna Vasanth Valavala"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/32077","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sinha, Sanjiv"]},{"key":"dc:creator","label":"Author","values":["Valavala, Krishna Vasanth"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-06-27T21:31:53Z","2014-06-28T10:00:29Z","2012-05"]},{"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":["Carbonation","nanoparticle","Calcium Oxide","Carbon dioxide","absorption","sequestration","random pore model","shrinking core model","silicon","single nanowire","thermoelectrics","thermal conductivity","measurement"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2012 Krishna Vasanth Valavala"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/32077"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Nanostructures typically exhibit thermo-physical properties that are different from their bulk counterparts. The size dependence of thermo physical properties is attributed to changing energy and mass transport phenomenon with varying length scales. This size dependence can be profitably leveraged to build cheap and efficient energy storage and harvesting systems when the materials are highly abundant. In this thesis, we study two different materials which exhibit favorable properties at lower length scales. In the first case, we study the dependence of particle size on energy storage and Carbon dioxide absorption capability of Calcium oxide particles. We theoretically establish in this work that the CaO nanoparticles achieve higher and faster reaction conversions than the micrometer sized particles. We identify the parameters which contribute to the superior performance of CaO nanoparticles and thereby provide design recommendations to sustain the enhanced performance. In the second case, Silicon, another abundant material, in the form of a nanowire has been experimentally examined as a candidate material for thermoelectric applications to harvest waste heat. We designed and fabricated a device to gauge the thermoelectric figure of merit of nano-structured materials by simultaneous characterization of thermal, electrical and seebeck properties. Using the fabricated device, the silicon nanowires are shown to have a tenfold reduction in thermal conductivity from its bulk value thereby establishing silicon nanowires as a promising thermoelectric material.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-25T19:01:03Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Valavala_Krishna Vasanth.pdf: 2948327 bytes, checksum: de968c4fd6099b458f310404e7555f94 (MD5) Valavala_Krishna.pdf: 2948327 bytes, checksum: de968c4fd6099b458f310404e7555f94 (MD5)","Made available in DSpace on 2012-06-27T21:31:53Z (GMT). No. of bitstreams: 2 Valavala_Krishna.pdf: 2948373 bytes, checksum: dfdfa2070c1acc7aeb945ff2abf69768 (MD5) license.txt: 4066 bytes, checksum: 7e63e0fa7839da3d32775bc2c0d1e2f4 (MD5)","Item marked as restricted to the 'Administrator' Group (id=1) by William Ingram (wingram2@illinois.edu) on 2012-06-27T21:32:50Z Item is restricted until 2014-06-27T21:32:23Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:29Z Item was in collections: Graduate Theses and Dissertations at Illinois (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 2 Valavala_Krishna.pdf: 2948373 bytes, checksum: dfdfa2070c1acc7aeb945ff2abf69768 (MD5) license.txt: 4066 bytes, checksum: 7e63e0fa7839da3d32775bc2c0d1e2f4 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:29Z"]},{"key":"dc:title","label":"Title","values":["Storage and transport of energy in nanostructures"]}]}],"canonical_facts":{"dc:contributor":["Sinha, Sanjiv"],"dc:creator":["Valavala, Krishna Vasanth"],"dc:date":["2012-06-27T21:31:53Z","2014-06-28T10:00:29Z","2012-05"],"dc:description":["Nanostructures typically exhibit thermo-physical properties that are different from their bulk counterparts. The size dependence of thermo physical properties is attributed to changing energy and mass transport phenomenon with varying length scales. This size dependence can be profitably leveraged to build cheap and efficient energy storage and harvesting systems when the materials are highly abundant. In this thesis, we study two different materials which exhibit favorable properties at lower length scales. In the first case, we study the dependence of particle size on energy storage and Carbon dioxide absorption capability of Calcium oxide particles. We theoretically establish in this work that the CaO nanoparticles achieve higher and faster reaction conversions than the micrometer sized particles. We identify the parameters which contribute to the superior performance of CaO nanoparticles and thereby provide design recommendations to sustain the enhanced performance. In the second case, Silicon, another abundant material, in the form of a nanowire has been experimentally examined as a candidate material for thermoelectric applications to harvest waste heat. We designed and fabricated a device to gauge the thermoelectric figure of merit of nano-structured materials by simultaneous characterization of thermal, electrical and seebeck properties. Using the fabricated device, the silicon nanowires are shown to have a tenfold reduction in thermal conductivity from its bulk value thereby establishing silicon nanowires as a promising thermoelectric material.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-25T19:01:03Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Valavala_Krishna Vasanth.pdf: 2948327 bytes, checksum: de968c4fd6099b458f310404e7555f94 (MD5) Valavala_Krishna.pdf: 2948327 bytes, checksum: de968c4fd6099b458f310404e7555f94 (MD5)","Made available in DSpace on 2012-06-27T21:31:53Z (GMT). No. of bitstreams: 2 Valavala_Krishna.pdf: 2948373 bytes, checksum: dfdfa2070c1acc7aeb945ff2abf69768 (MD5) license.txt: 4066 bytes, checksum: 7e63e0fa7839da3d32775bc2c0d1e2f4 (MD5)","Item marked as restricted to the 'Administrator' Group (id=1) by William Ingram (wingram2@illinois.edu) on 2012-06-27T21:32:50Z Item is restricted until 2014-06-27T21:32:23Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:29Z Item was in collections: Graduate Theses and Dissertations at Illinois (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 2 Valavala_Krishna.pdf: 2948373 bytes, checksum: dfdfa2070c1acc7aeb945ff2abf69768 (MD5) license.txt: 4066 bytes, checksum: 7e63e0fa7839da3d32775bc2c0d1e2f4 (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:29Z"],"dc:identifier":["http://hdl.handle.net/2142/32077"],"dc:language":["en"],"dc:rights":["Copyright 2012 Krishna Vasanth Valavala"],"dc:subject":["Carbonation","nanoparticle","Calcium Oxide","Carbon dioxide","absorption","sequestration","random pore model","shrinking core model","silicon","single nanowire","thermoelectrics","thermal conductivity","measurement"],"dc:title":["Storage and transport of energy in nanostructures"],"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":"2026-07-22T22:25:30Z"}