Unusual strain-dependent thermal conductivity modulation of silver nanoflower-polyurethane fibers

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dc.contributor.authorAgha Aamir Jan-
dc.contributor.authorDaewoo Suh-
dc.contributor.authorSeonghyun Bae-
dc.contributor.authorSeunghyun Baik-
dc.date.available2019-01-03T05:31:35Z-
dc.date.created2018-10-15-
dc.date.issued2018-10-
dc.identifier.issn2040-3364-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/5119-
dc.description.abstractThermal management of stretchable and wearable electronic devices is an important issue in enhancing performance, reliability, and human thermal comfort. Here, we constructed a unique experimental setup which investigated the strain-dependent thermal conductivity. The thermal conductivity of flower-shaped silver nanoparticle (silver nanoflower)-polyurethane (Ag-PU) composite fibers was systematically investigated as a function of strain. The strain-dependent temperature distribution of the Joule-heated fiber was measured using an infrared camera, and the thermal conductivity was obtained from the 1-dimensional Fourier's conduction model. There was a monotonic decrease in both lattice and electronic thermal conductivity with stretching at 25 °C. However, there was an initial increase in lattice and total thermal conductivity in the low strain region (<10%), when the fiber was stretched at 45 °C, although the electronic thermal conductivity decreased monotonically. The softening of the polymer at increased temperatures enhanced Poisson's ratio. Resultantly, the fiber cross-sectional area and radial-direction inter-particle distance between silver nanoflowers decreased. This could increase the thermal transport in conductive fibers by modulating the interfaces between silver nanoflowers and polyurethane. A further stretching decreased the lattice thermal conductivity due to the significantly increased axial distance between silver nanoflowers and the decreased filler fraction. The weft-knitted fabric also demonstrated an increased thermal conductance in the low strain region (≤30%) at 45 °C. © 2018 The Royal Society of Chemistry-
dc.languageENG-
dc.publisherROYAL SOC CHEMISTRY-
dc.titleUnusual strain-dependent thermal conductivity modulation of silver nanoflower-polyurethane fibers-
dc.typeArticle-
dc.type.rimsA-
dc.identifier.wosid000450934400038-
dc.identifier.scopusid2-s2.0-85054263165-
dc.contributor.affiliatedAuthorSeunghyun Baik-
dc.identifier.bibliographicCitationNANOSCALE, v.10, no.37, pp.17799 - 17806-
dc.embargo.liftdate9999-12-31-
dc.embargo.terms9999-12-31-
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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