PMID- 30290118 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20181211 LR - 20201001 IS - 1530-6992 (Electronic) IS - 1530-6984 (Linking) VI - 18 IP - 11 DP - 2018 Nov 14 TI - Woven Kevlar Fiber/Polydimethylsiloxane/Reduced Graphene Oxide Composite-Based Personal Thermal Management with Freestanding Cu-Ni Core-Shell Nanowires. PG - 6731-6739 LID - 10.1021/acs.nanolett.8b02408 [doi] AB - Thermotherapy is a widespread technique that provides relief for muscle spasms and joint injuries. A great deal of energy is used to heat the surrounding environment, and heat emitted by the human body is wasted on our surroundings. Herein, a woven Kevlar fiber (WKF)-based personal thermal management device was fabricated by directly growing vertical copper-nickel (Cu-Ni) nanowires (NWs) on the WKF surface using a hydrothermal method. The treated WKF was combined with reduced graphene oxide (rGO) dispersed in polydimethylsiloxane (PDMS) to form composites using vacuum-assisted resin transfer molding (VARTM). This WKF-based personal thermal management system contained a conductive network of metallic NWs and rGO that promoted effective Joule heating and reflected back the infrared (IR) radiation emitted by the human body. It thus behaved as a type of thermal insulation. The Cu-Ni NWs were synthesized with a tunable Ni layer on Cu core NWs to enhance the oxidation resistance of the Cu NWs. The combined effect of the NW networks and rGO enabled a surface temperature of 70 degrees C to be attained on application of 1.5 V to the composites. The Cu(3)Ni(1)-WKF/PDMS provided 43% more thermal insulation and higher IR reflectance than bare WKF/PDMS. The absorbed impact energy and tensile strength was highest for the Cu(1)Ni(3)- and rGO-integrated WKF/PDMS samples. Those Cu-Ni NWs having higher Ni contents displayed better mechanical properties and those with higher Cu contents showed higher Joule heating performance and IR reflectivity at a given rGO loading. The composite shows sufficient breathability and very high durability. The high flexibility of the composites and their ability to generate sufficient heat during various human motions ensures their suitability for wearable applications. FAU - Hazarika, Ankita AU - Hazarika A AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. FAU - Deka, Biplab K AU - Deka BK AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. FAU - Kim, DoYoung AU - Kim D AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. FAU - Jeong, Hoon Eui AU - Jeong HE AUID- ORCID: 0000-0002-1413-3774 AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. FAU - Park, Young-Bin AU - Park YB AUID- ORCID: 0000-0001-5936-7155 AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. FAU - Park, Hyung Wook AU - Park HW AUID- ORCID: 0000-0002-7751-1402 AD - Department of Mechanical Engineering , Ulsan National Institute of Science and Technology , 50 UNIST-gil , Ulsan , Republic of Korea , 44919. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20181011 PL - United States TA - Nano Lett JT - Nano letters JID - 101088070 OTO - NOTNLM OT - Cu-Ni nanowires OT - Kevlar OT - Thermal management OT - mechanical properties OT - reduced graphene oxide OT - wearable heater EDAT- 2018/10/06 06:00 MHDA- 2018/10/06 06:01 CRDT- 2018/10/06 06:00 PHST- 2018/10/06 06:00 [pubmed] PHST- 2018/10/06 06:01 [medline] PHST- 2018/10/06 06:00 [entrez] AID - 10.1021/acs.nanolett.8b02408 [doi] PST - ppublish SO - Nano Lett. 2018 Nov 14;18(11):6731-6739. doi: 10.1021/acs.nanolett.8b02408. Epub 2018 Oct 11.