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Title: Effects of geometry and composition of soft polymer films embedded with nanoparticles on rates for optothermal heat dissipation

Abstract

Embedding soft matter with nanoparticles (NPs) can provide electromagnetic tunability at sub-micron scales for growing number of uses in healthcare, sustainable energy, and chemical processing. But use of NP-embedded soft material in temperature-sensitive applications has been constrained by difficulty in validating prediction of rates for energy dissipation across thermally insulating to conducting behavior. This work improved embedment of monodisperse NP to stably decrease inter-NP spacings in polydimethylsiloxane (PDMS) to nano-scales. Lumped-parameter and finite element analyses were refined to apportion effects of structure and composition of NP-embedded soft polymer to rates for conductive, convective, and radiative heat dissipation. These advances allowed rational selection of PDMS size and NP composition to optimize measured rates of internal (conductive) and external (convective and radiative) heat dissipation. Stably reducing distance between monodisperse NP to nano-scale intervals increased overall heat dissipation rate by up to 29%. Refined fabrication of NP-embedded polymer enabled tunability of dynamic thermal response, the ratio of internal to external dissipation rate, by a factor of 3.1 to achieve a value of 0.091, the largest reported to date. Heat dissipation rates simulated a priori were consistent with 130 μm resolution thermal images across 2- to 15-fold changes in NP-PDMS geometry and composition. Nusseltmore » number was observed to increase with the fourth root of Rayleigh number across thermally insulative and conductive regimes, further validating the approach. These developments support model-informed design of soft media embedded with nano-scale spaced NP to optimize heat dissipation rates for evolving temperature-sensitive diagnostic and therapeutic modalities as well as emerging uses in flexible bioelectronics, cell and tissue culture, and solar-thermal heating.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [3];  [1]
  1. Univ. of Arkansas, Fayetteville, AR (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Arkansas, Fayetteville, AR (United States)
  3. Univ. of Arkansas, Fayetteville, AR (United States); Army Research Lab., Adelphi, MD (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
1457666
Report Number(s):
NREL/JA-5900-71827
Journal ID: ISSN 2040-3364; NANOHL
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 10; Journal Issue: 24; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; nanoparticles; polymer films; soft matter; heat dissipation

Citation Formats

Roper, D. Keith, Berry, Keith R., Dunklin, Jeremy R., Chambers, Caitlyn, Bejugam, Vinith, Forcherio, Gregory T., and Lanier, Megan. Effects of geometry and composition of soft polymer films embedded with nanoparticles on rates for optothermal heat dissipation. United States: N. p., 2018. Web. doi:10.1039/C8NR00977E.
Roper, D. Keith, Berry, Keith R., Dunklin, Jeremy R., Chambers, Caitlyn, Bejugam, Vinith, Forcherio, Gregory T., & Lanier, Megan. Effects of geometry and composition of soft polymer films embedded with nanoparticles on rates for optothermal heat dissipation. United States. doi:10.1039/C8NR00977E.
Roper, D. Keith, Berry, Keith R., Dunklin, Jeremy R., Chambers, Caitlyn, Bejugam, Vinith, Forcherio, Gregory T., and Lanier, Megan. Tue . "Effects of geometry and composition of soft polymer films embedded with nanoparticles on rates for optothermal heat dissipation". United States. doi:10.1039/C8NR00977E.
@article{osti_1457666,
title = {Effects of geometry and composition of soft polymer films embedded with nanoparticles on rates for optothermal heat dissipation},
author = {Roper, D. Keith and Berry, Keith R. and Dunklin, Jeremy R. and Chambers, Caitlyn and Bejugam, Vinith and Forcherio, Gregory T. and Lanier, Megan},
abstractNote = {Embedding soft matter with nanoparticles (NPs) can provide electromagnetic tunability at sub-micron scales for growing number of uses in healthcare, sustainable energy, and chemical processing. But use of NP-embedded soft material in temperature-sensitive applications has been constrained by difficulty in validating prediction of rates for energy dissipation across thermally insulating to conducting behavior. This work improved embedment of monodisperse NP to stably decrease inter-NP spacings in polydimethylsiloxane (PDMS) to nano-scales. Lumped-parameter and finite element analyses were refined to apportion effects of structure and composition of NP-embedded soft polymer to rates for conductive, convective, and radiative heat dissipation. These advances allowed rational selection of PDMS size and NP composition to optimize measured rates of internal (conductive) and external (convective and radiative) heat dissipation. Stably reducing distance between monodisperse NP to nano-scale intervals increased overall heat dissipation rate by up to 29%. Refined fabrication of NP-embedded polymer enabled tunability of dynamic thermal response, the ratio of internal to external dissipation rate, by a factor of 3.1 to achieve a value of 0.091, the largest reported to date. Heat dissipation rates simulated a priori were consistent with 130 μm resolution thermal images across 2- to 15-fold changes in NP-PDMS geometry and composition. Nusselt number was observed to increase with the fourth root of Rayleigh number across thermally insulative and conductive regimes, further validating the approach. These developments support model-informed design of soft media embedded with nano-scale spaced NP to optimize heat dissipation rates for evolving temperature-sensitive diagnostic and therapeutic modalities as well as emerging uses in flexible bioelectronics, cell and tissue culture, and solar-thermal heating.},
doi = {10.1039/C8NR00977E},
journal = {Nanoscale},
number = 24,
volume = 10,
place = {United States},
year = {Tue Jun 12 00:00:00 EDT 2018},
month = {Tue Jun 12 00:00:00 EDT 2018}
}

Journal Article:
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This content will become publicly available on June 12, 2019
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