Using atomic layer deposited tungsten to increase thermal conductivity of a packed bed
- Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550 (United States)
- Department of Mechanical Engineering, University of Colorado, UCB 427, Boulder, Colorado 80309-0427 (United States)
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.
- OSTI ID:
- 22398906
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effective thermal conductivity of a packed bed of hollow zirconia microspheres, under vacuum and under 100 kPa of argon
A Preliminary Study of the Effect of Shifts in Packing Fraction on k-effective in Pebble-Bed Reactors