Imaging of spatio-temporal pattern evolution during carbon monoxide oxidation on platinum
Nature, ISSN: 0028-0836, Vol: 343, Issue: 6256, Page: 355-357
1990
- 249Citations
- 36Captures
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
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Article Description
THE rates of chemical reactions may exhibit temporal oscillations, even when the reaction parameters are kept constant. These oscillations might be associated with spatial pattern formation owing to local variations of concentrations or temperature, or both, which propagate as chemical waves. An example is the catalytic oxidation of carbon monoxide on the surfaces of platinum single crystals. The mechanism of this reaction is well known, and under isothermal, low-pressure conditions, many types of temporal self-organization, ranging from harmonic oscillations to chaotic behaviour, have been observed. Spatial patterns have also been demonstrated by scanning beams of either electrons or ultraviolet photons across the surface, and by monitoring the electrons reflected or photoemitted, respectively. However, both scanning techniques are hampered by limited temporal as well as lateral resolution. Here we present observations of an unexpectedly rich variety of self-sustained spatio-temporal patterns by continuous imaging (on a timescale of ≳1 ms) of the surfaces using a newly developed, photoemission electron microscope with a spatial resolution of a few micrometres. Pattern evolution can be followed on a much finer timescale than is available from other imaging techniques. We observe a new type of structure with strong similarities to those found in the Belousov-Zhabotinsky oscillatory reaction. © 1990 Nature Publishing Group.
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