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Sonochemical synthesis of reactive boron nanomaterials and their combustion properties

Published online by Cambridge University Press:  02 March 2015

Andrew P. Purdy ,
Albert Epshteyn  and
Michael Weismiller
Andrew P. Purdy
Affiliation:
Naval Research Laboratory, Chemistry Division, code 6100, Washington DC 20375-5342
Albert Epshteyn
Affiliation:
Naval Research Laboratory, Chemistry Division, code 6100, Washington DC 20375-5342
Michael Weismiller
Affiliation:
Naval Research Laboratory, Chemistry Division, code 6100, Washington DC 20375-5342
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Abstract

We have demonstrated the synthesis of highly reactive boron nanomaterials by alkali metal reduction of BCl3 under sonication, followed by annealing. Unlike ordinary boron powders, these materials combust completely and release close to their theoretical energy content (based on elemental analysis) in polymer protected bomb calorimetry experiments. We have scaled up the synthesis using a commercial (Columbia International CIT-UHiPR-U1000V600) ultrasonic hi-pressure reactor. The synthesis reactions exhibit a scale problem, where they yield diminishes considerably on scale up, probably a result of alkali metals becoming trapped inside a mass of salts and rendered unable to react. We measured the combustion properties of the materials by bomb calorimetry, and thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), and report elemental analyses on selected samples.

Keywords

energetic materialnanoscaleB
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1758: Symposium VV – Recent Advances in Reactive Materials , 2015 , mrsf14-1758-vv08-04
Copyright
Copyright © Materials Research Society 2015 

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References

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