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

Nanoscale
Agha Aamir JanSeunghyun Baik

Abstract

Thermal 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 fiber...Continue Reading

References

Jan 26, 2008·Nature Materials·G Jeffrey Snyder, Eric S Toberer
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Nov 30, 2010·Nature Nanotechnology·Kyoung-Yong ChunSeunghyun Baik
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Citations

Jan 18, 2019·Physical Chemistry Chemical Physics : PCCP·Daewoo SuhSeunghyun Baik

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Methods Mentioned

BETA
scanning electron microscopy
differential scanning calorimetry
X-ray

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