Predicting plasma conditions necessary for synthesis of γ-Al2O3nanocrystals

Austin J. Cendejas; He Sun; Sophia E. Hayes; Uwe Kortshagen; Elijah Thimsen

doi:10.1039/d1nr02488d

Predicting plasma conditions necessary for synthesis of γ-Al₂O₃nanocrystals

Austin J. Cendejas, He Sun, Sophia E. Hayes, Uwe Kortshagen, Elijah Thimsen

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Nonthermal plasma (NTP) offers a unique synthesis environment capable of producing nanocrystals of high melting point materials at relatively low gas temperatures. Despite the rapidly growing material library accessible through NTP synthesis, designing processes for new materials is predominantly empirically driven. Here, we report on the synthesis of both amorphous alumina and γ-Al2O3 nanocrystals and present a simple particle heating model that is suitable for predicting the plasma power necessary for crystallization. The heating model only requires the composition, temperature, and pressure of the background gas along with the reactor geometry to calculate the temperature of particles suspended in the plasma as a function of applied power. Complete crystallization of the nanoparticle population was observed when applied power was greater than the threshold where the calculated particle temperature is equal to the crystallization temperature of amorphous alumina.

Original language	English (US)
Pages (from-to)	11387-11395
Number of pages	9
Journal	Nanoscale
Volume	13
Issue number	26
DOIs	https://doi.org/10.1039/d1nr02488d
State	Published - Jul 14 2021

Bibliographical note

Funding Information:
The authors acknowledge financial support from the Army Research Office MURI grant W911NF-18-1-0240. This work was performed in part at the Institute of Materials Science and Engineering at Washington University in Saint Louis, and the authors acknowledge financial support for the use of instruments and staff assistance. This study made use of the National Magnetic Resonance Facility at Madison, which is supported by NIH grant P41GM136463, P41GM103399 (NIGMS), former number: P41RR002301. Equipment was purchased with funds from the University of Wisconsin–Madison, the NIH (P41GM103399, S10RR02781, S10RR08438, S10RR023438, S10RR025062, S10RR029220), the NSF (DMB-8415048, OIA-9977486, BIR-9214394), and the USDA. H. S. acknowledges support from NSF award 1640899.

Publisher Copyright:
© The Royal Society of Chemistry.

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abstract = "Nonthermal plasma (NTP) offers a unique synthesis environment capable of producing nanocrystals of high melting point materials at relatively low gas temperatures. Despite the rapidly growing material library accessible through NTP synthesis, designing processes for new materials is predominantly empirically driven. Here, we report on the synthesis of both amorphous alumina and γ-Al2O3 nanocrystals and present a simple particle heating model that is suitable for predicting the plasma power necessary for crystallization. The heating model only requires the composition, temperature, and pressure of the background gas along with the reactor geometry to calculate the temperature of particles suspended in the plasma as a function of applied power. Complete crystallization of the nanoparticle population was observed when applied power was greater than the threshold where the calculated particle temperature is equal to the crystallization temperature of amorphous alumina.",

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