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Title: Using atomic layer deposited tungsten to increase thermal conductivity of a packed bed

This study investigated the effective thermal conductivity (k{sub eff}) of packed-beds that contained porous particles with nanoscale tungsten (W) films of different thicknesses formed by atomic layer deposition (ALD). A continuous film on the particles is vital towards increasing k{sub eff} of the packed beds. For example, the k{sub eff} of an alumina packed bed was increased by three times after an ∼8-nm continuous W film with 20 cycles of W ALD, whereas k{sub eff} was decreased on a polymer packed bed with discontinuous, evenly dispersed W-islands due to nanoparticle scattering of phonons. For catalysts, understanding the thermal properties of these packed beds is essential for developing thermally conductive supports as alternatives to structured supports.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Department of Chemical and Biological Engineering, University of Colorado, UCB 596, Boulder, Colorado 80309-0596 (United States)
  2. Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550 (United States)
  3. Department of Mechanical Engineering, University of Colorado, UCB 427, Boulder, Colorado 80309-0427 (United States)
Publication Date:
OSTI Identifier:
22398906
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM OXIDES; CATALYSTS; DEPOSITION; LAYERS; NANOSTRUCTURES; PACKED BEDS; PHONONS; POLYMERS; POROUS MATERIALS; SCATTERING; THERMAL CONDUCTIVITY; THICKNESS; THIN FILMS; TUNGSTEN