Diffusive vs Explosive Reaction at the Nanoscale

被引：115

作者：

Chowdhury, Snehaunshu ^{[1
]}

Sullivan, Kyle ^{[1
]}

Piekiel, Nicholas ^{[1
]}

Zhou, Lei ^{[1
]}

Zachariah, Michael R. ^{[1
]}

机构：

[1] Univ Maryland, College Pk, MD 20742 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 20期

关键词：

ALUMINUM; COMBUSTION; OXIDATION; IGNITION; KINETICS; SIZE;

D O I：

10.1021/jp906613p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solid-solid reactions at the nanoscale between a metal passivated with a nascent oxide and another metal oxide can result in a very violent reaction. This begs the question as to what mechanism is responsible for such a rapid reaction. The ignition of nanoscale Al/CuO thermites with different aluminum oxide shell thicknesses were investigated on a fast heated (similar to 10(5) K/s) platinum wire. Ramping the wire temperature to similar to 1250 K and then shutting off the voltage pulse result in ignition well after the pulse is turned off; i.e., an ignition delay is observed. The delay is used as a probe to extract the effective diffusion coefficient of the diffusing species, which is confirmed by fast time-resolved mass spectrometry. The results of this study are consistent with a diffusion controlled ignition mechanism.

引用

页码：9191 / 9195

页数：5

共 30 条

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