Dynamical Bragg diffraction from crystalline colloidal arrays
Polystyrene spheres with attached functional groups that ionize in solution repel one another; at sufficiently high sphere concentrations the spheres self-assemble into a crystalline lattice with latt...
Polystyrene spheres with attached functional groups that ionize in solution repel one another; at sufficiently high sphere concentrations the spheres self-assemble into a crystalline lattice with latt...
Steady and nonsteady rates of reaction in a heterogeneously catalyzed reaction: Oxidation of CO on platinum, experiments and simulations
The rate of reaction for oxidation of CO over (210) and (111) single-crystal surfaces of platinum has been studied as a function of reactant pressures (PO2,PCO) and sample temperature (T), both experi...
The rate of reaction for oxidation of CO over (210) and (111) single-crystal surfaces of platinum has been studied as a function of reactant pressures (PO2,PCO) and sample temperature (T), both experi...
Imaging of spatial pattern formation in an oscillatory surface reaction by scanning photoemission microscopy
J. Chem. Phys. 91, 4942 (1989); doi:10.1063/1.456735
Issue Date: 15 October 1989
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The rate of catalytic carbon monoxide oxidation on a Pt(100) single crystal surface under isothermal, low-pressure conditions exhibits for certain ranges of parameters (O2 and CO partial pressures, temperature) sustained temporal oscillations whose mechanism had been explored in previous work. Coupling between reaction and diffusion leads to spatial pattern formation as manifested by patches with different work function on the intrinsically homogeneous surface. Imaging is performed by means of the novel technique of scanning photoemission microscopy. Typically, nuclei with dimensions of a few microns, as determined by the instrumental resolution, are formed spontaneously and expand with sharp fronts and velocities of about 0.5 mm/min (at 480 K) up to sizes 
1 mm. Waves with even more extended fronts propagating with somewhat higher velocities across the sample surface are responsible for the occurrence of large amplitude temporal oscillations of the integral reaction rate.
The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
1 mm. Waves with even more extended fronts propagating with somewhat higher velocities across the sample surface are responsible for the occurrence of large amplitude temporal oscillations of the integral reaction rate.
The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
| History: | Received 7 June 1989; accepted 11 July 1989 |
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http://link.aip.org/link/?JCPSA6/91/4942/1 |
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KEYWORDS and PACS
CATALYSIS,
OXIDATION,
CARBON MONOXIDE,
PLATINUM,
SURFACE REACTIONS,
NONDESTRUCTIVE TESTING,
WORK FUNCTIONS,
CHEMICAL REACTION KINETICS,
PHOTOEMISSION,
MICROSCOPY,
MONITORING
- 82.65.Jv
Physical chemistry Surface and interface chemistry Heterogeneous catalysis at surfaces - 82.20.Pm
Physical chemistry Chemical kinetics Measurements of rate constants, reaction cross sections, and activation energies - 79.60.Gs
Electron and ion emission by liquids and solids; impact phenomena Photoemission and photoelectron spectra Composite surfaces - YEAR: 1988-89
RELATED DATABASES
PUBLICATION DATA
0021-9606 (print)
1089-7690 (online)
AIP
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