Chemistry 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Chemistry
标 题: 超薄催化剂的热机非稳定性
发信站: 哈工大紫丁香 (Sun Jun 29 10:18:29 2003)
http://intl.sciencemag.org/cgi/content/abstract/300/5627/1932
Oscillatory Thermomechanical Instability of an Ultrathin Catalyst
Fehmi Cirak,1 Jaime E. Cisternas,2 Alberto M. Cuiti?o,5 Gerhard Ertl,6
Philip Holmes,2,3 Ioannis G. Kevrekidis,4,2 Michael Ortiz,1 Harm Hinrich
Rotermund,6* Michael Schunack,6 Janpeter Wolff6
Because of the small thermal capacity of ultrathin (200 nanometers) metal
single crystals, it is possible to explore the coupling of catalytic and
thermal action at low pressures. We analyzed a chemothermomechanical
instability in this regime, in which catalytic reaction kinetics interact
with heat transfer and mechanical buckling to create oscillations. These
interacting components are separated and explored through experimentation,
mathematical modeling, and scientific computation, and an explanation of
the phenomenon emerges from their synthesis.
1 Division of Engineering and Applied Science, California Institute of
Technology, Pasadena, CA 91125, USA.
Technology, Pasadena, CA 91125, USA.
2 Program in Applied and Computational Mathematics, Princeton University,
Princeton, NJ 08544, USA.
3 Department of Mechanical and Aerospace Engineering, Princeton University,
Princeton, NJ 08544, USA.
4 Department of Chemical Engineering, Princeton University, Princeton, NJ
08544, USA.
5 Department of Mechanical and Aerospace Engineering, Rutgers University,
Piscataway, NJ 08854, USA.
6 Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195
Berlin, Germany.
* To whom correspondence should be addressed. E-mail:
rotermun@fhi-berlin.mpg.de
Volume 300, Number 5627, Issue of 20 Jun 2003, pp. 1932-1936.
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