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Science 18 May 2001:
Vol. 292. no. 5520, p. 1257
DOI: 10.1126/science.292.5520.1257d
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This Week in Science
Some chemical reactions couple reaction and diffusion under steady-state conditions in such a way that chemical patterns or waves are set up. For one such "oscillatory" reaction, the oxidation of CO on the (100) surface of platinum, the reaction-diffusion patterns are highly sensitive to changes and concentration, and waves can run into each and set up chemical "turbulence" that can be imaged in the photoelectron microscope. Kim et al. (p. 1357) now show that by changing the intensity of global feedback control of one the reactants, CO, not only can turbulence be suppressed, but chaotic regimes of patterns that form and annihilate can be generated, as well as stable cluster patterns and standing waves. Feedback control is facilitated more easily in this case than for a reaction in solution because the change in CO concentration can be made at once across the entire surface.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
