TY - JOUR
T1 - Composite catalyst surfaces
T2 - Effect of inert and active heterogeneities on pattern formation
AU - Bär, M.
AU - Bangia, A. K.
AU - Kevrekidis, I. G.
AU - Haas, G.
AU - Rotermund, H. H.
AU - Ertl, G.
PY - 1996/12/5
Y1 - 1996/12/5
N2 - Spatiotemporal dynamics in reaction-diffusion systems can be altered through the properties (reactivity, diffusivity) of the medium in which they occur. We construct active heterogeneous media (composite catalytic surfaces with inert as well as active inclusions) using microelectronics fabrication techniques and study the spatiotemporal dynamics of heterogeneous catalytic reactions on these catalysts. In parallel, we perform simulations as well as numerical stability and bifurcation analysis of these patterns using mechanistic models. At the limit of large heterogeneity "grain size" (compared to the wavelength of spontaneously arising structures) the interaction of patterns with inert or active boundaries dominates (e.g., pinning, transmission, and boundary breakup of spirals, interaction of pulses with corners, "pacemaker" effects). At the opposite limit of very small or very finely distributed heterogeneity, effective behavior is observed (slight modulation of pulses, nearly uniform oscillations, effective spirals). Some representative studies of transitions between the two limits are presented.
AB - Spatiotemporal dynamics in reaction-diffusion systems can be altered through the properties (reactivity, diffusivity) of the medium in which they occur. We construct active heterogeneous media (composite catalytic surfaces with inert as well as active inclusions) using microelectronics fabrication techniques and study the spatiotemporal dynamics of heterogeneous catalytic reactions on these catalysts. In parallel, we perform simulations as well as numerical stability and bifurcation analysis of these patterns using mechanistic models. At the limit of large heterogeneity "grain size" (compared to the wavelength of spontaneously arising structures) the interaction of patterns with inert or active boundaries dominates (e.g., pinning, transmission, and boundary breakup of spirals, interaction of pulses with corners, "pacemaker" effects). At the opposite limit of very small or very finely distributed heterogeneity, effective behavior is observed (slight modulation of pulses, nearly uniform oscillations, effective spirals). Some representative studies of transitions between the two limits are presented.
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U2 - 10.1021/jp961689q
DO - 10.1021/jp961689q
M3 - Article
AN - SCOPUS:21544438058
SN - 0022-3654
VL - 100
SP - 19106
EP - 19117
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
IS - 49
ER -