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In Situ Observation of Nanocrystal Formation Via Dehydroxylation

Published online by Cambridge University Press:  02 July 2020

Renu Sharma ,
M. J. McKelvy ,
Hamdallah Bearat ,
Andrew V.G. Chizmeshya  and
R.W. Carpenter
Renu Sharma
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ , 85287-1704
M. J. McKelvy
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ , 85287-1704
Hamdallah Bearat
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ , 85287-1704
Andrew V.G. Chizmeshya
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ , 85287-1704
R.W. Carpenter
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ , 85287-1704
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Abstract

Recently, a promising new route to prepare nano phase composites with fine transition metal particles (2 - 50nm) has been proposed via dehydroxylation and dehydration process. Thermal and mechanical dehydroxylation process has also been used to form ultra fine powders of NiO-Ni(OH). We have found a substantially increased carbonation rate at room temperature (RT) for partially dehydroxylated brucite (Mg(OH)2) single crystal fragments. BET measurements confirm the increase in the surface area of partially dehydroxylated (90%) single-crystal Mg(OH)2 fragments, which directly contributes to the increase in carbonation reactivity. As dehydroxylation proceeds rapidly in a TEM column, due to high vacuum and electron beam effects, the atomic level nature of the process has not been understood until recently.6 We have observed the development of nanocrystals during in situdehydroxylation of Mg(OH)2.

Experiments were performed using a PHILIPS-430 electron microscope operated at 300KV, fitted with a differentially pumped environmental-cell (E-cell) and a Gatan Imaging Filter (GIF).

Type
Novel Microscopy Assisted Ceramic Developments in Materials Scienceand Nanotechnology (Organized by P. Gai and J. Lee)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 438 - 439
Copyright
Copyright © Microscopy Society of America 2001

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References

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6.Renu, Sharma and Karl, Weiss, Microscopy Research and Technique 42(1998)270.Google Scholar
7. DOE grants (DE-FG0395TE00068 and DE-FG26-98FT40112) and the Center for High Resolution Electron Microscopy are gratefully acknowledged.Google Scholar