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Energetic metastable n-Al@PVDF/EMOF composite nanofibers with improved combustion performances.

Authors :
He, Wei
Li, Zhi-Hao
Chen, Shuwen
Yang, Guangcheng
Yang, Zhijian
Liu, Pei-Jin
Yan, Qi-Long
Source :
Chemical Engineering Journal. Mar2020, Vol. 383, pN.PAG-N.PAG. 1p.
Publication Year :
2020

Abstract

• An Al-based MIC (EF@EMOF) was prepared via electrospinning combining with in situ growth technique. • Obtained MIC has significantly increased heat release and burning rate. • The etching reaction avoids the sintering and improves combustion efficiency. Combustion is a kind of reacting process involves fluid mechanics and chemical reactions at the same time. In the past decades, little attention has been paid to the improvement on the heat and mass transfer rate of EMs, especially for metastable intermixed composites (MICs). In this paper, an Al-based MIC (EF@EMOF) with modified chemical kinetics as well as improved heat and mass transfer rate was prepared by precisely designing the reaction process and introducing energetic metal organic frameworks (EMOF) with high specific surface area as the reactants. The overall reaction process includes the activation of n-Al by eliminating Al 2 O 3 , decomposition of EMOF producing metal oxide, followed by exothermic reactions between the activated n-Al with metal oxide and PVDF. Results show that obtained MIC has significantly increased heat release (3464 J g−1), burning rate (more than 5 times faster than that of mechanically mixed one), and improved combustion efficiency. Furthermore, it is found that the decomposition of EMOF as well as the etching reaction generates massive gas products on the interface layer which avoid the sintering and form lots of holes. Those holes, in return, provide new channels for the further reaction, thus significantly improving the energy output and chemical reaction kinetics. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13858947
Volume :
383
Database :
Academic Search Index
Journal :
Chemical Engineering Journal
Publication Type :
Academic Journal
Accession number :
140846179
Full Text :
https://doi.org/10.1016/j.cej.2019.123146