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Fragmentation and film growth in supersonic nanoaggregate aerosol deposition

Journal Article · · AIChE Journal
DOI:https://doi.org/10.1002/aic.16874· OSTI ID:1820656
 [1];  [2];  [3];  [2];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States); Intel Corporation, Hillsboro, OR (United States); University of Minnesota
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States); ETH Zurich (Switzerland)

Aerosol deposition with gas phase-synthesized chain-like nanoaggregates can yield dense coatings from the impaction of particles on a substrate; however, dense coating formation is not well understood. Here, we study coating consolidation at the single nanoaggregate level. Flame spray pyrolysis-made tin oxide nanoaggregates are mobility (size) filtered, accelerated through a de Laval nozzle, and impacted on alumina substrates. TEM images obtained from low velocity collection and supersonic deposition are compared via quantitative image analysis, which reveals that upon supersonic impact nanoaggregates fragment into smaller aggregates. Furthermore, this suggests that fragmentation is a key step in producing coatings denser than the depositing nanoaggregates themselves. We supplement experiments with detailed particle trajectory calculations, which show that the impact energies per atom during nanoaggregate deposition are below 0.2 eV/molecule. These results suggest that fragmentation can only occur at locations where nanoaggregates bonded by van der Waals and capillary interactions.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States); Colorado School of Mines, Golden, CO (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001094
OSTI ID:
1820656
Journal Information:
AIChE Journal, Journal Name: AIChE Journal Journal Issue: 4 Vol. 66; ISSN 0001-1541
Publisher:
American Institute of Chemical EngineersCopyright Statement
Country of Publication:
United States
Language:
English

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