Fritz-Haber-Institut der Max-Planck-Gesellschaft
DFG-Sonderforschungsbereich 555 "Komplexe Nichtlineare
Prozesse"
Fourth International Symposium
Engineering of Chemical Complexity
Berlin, June 7-9, 2006
Program and Organization: G. Ertl, A. S. Mikhailov, H. H. Rotermund
The aim of this meeting is to review current perspectives for design, manipulation and efficient control of self-organizing complex chemical systems, ranging from biotechnology and reactive nanostructures to macroscopic pattern formation in chemical reactors. Both experimental studies of such phenomena and their mathematical modeling will be discussed. Possible technological applications of self-organization phenomena shall be considered.
Invited Speakers
Download a printer-friendly version of the program (PDF, ca. 83kB).
16:00 – 20:00 Arrival and registration
8:45 Opening: G. Ertl
Session chair: P. De Kepper
9:00
R. Kapral
(Toronto, Canada)
Geometrical effects on spiral defect dynamics
[Abstract]
9:35
Y. Kuramoto
(Sapporo, Japan)
Noise-induced chemical turbulence
[Abstract]
10:10
J. L. Hudson
(Virginia University, USA)
Dynamical order and complexity in populations of electrochemical oscillators
[Abstract]
10:45 – 11:15 Coffee Break
Session chair: R. Kapral
11:15
I. R. Epstein
(Waltham, USA)
Localized structures in reaction-diffusion systems
[Abstract]
11:50
H. Kitahata
(Kyoto, Japan)
Spontaneous motion of a droplet driven by chemical potential or photon flux
[Abstract]
12:25 – 14:00 Lunch
Session chair: N. Jaeger
14:00
P. De Kepper
(Bordeaux, France)
The Landolt reaction: Stationary and oscillating fronts in an open spatial reactor with
conical geometry
14:35
A. De Wit
(Brussels, Belgium)
Hydrodynamic instability of autocatalytic reaction fronts
[Abstract]
15:10
O. Steinbock
(Tallahassee, USA)
Three-dimensional wave structures in excitable media
15:45 – 16:15 Coffee break
Session chair: M. Marek
16:15
K. Showalter
(Morgantown, USA)
Collective behavior in addressable excitable media
[Abstract]
16:50
H. Engel
(Berlin, Germany)
Feedback-controlled motion of a spiral wave core along a desired trajectory in an
excitable medium
[Abstract]
Session chair: K. Showalter
9:00
M. Bär
(Berlin, Germany)
Effective models and homogenization in reaction-diffusion processes: from tunable
pattern formation to realistic heart modeling
[Abstract]
9:35
U. Steiner
(Cambridge, UK)
Structure formation in organic-inorganic hybrid materials
10:10
Y. Yokoyama
(Tsukuba, Japan)
Morphology and dynamics of microscopic bubbles in liquid crystals
[Abstract]
10:45 – 11:15 Coffee Break
Session chair: Y. Kevrekidis
11:15
E. Bodenschatz
(Göttingen, Germany)
Spatially forced patterns and hexaroll chaos
[Abstract]
11:50
R. Ismagilov
(Chicago, USA)
Using microfluidics and modular mechanism to understand spatiotemporal dynamics
of complex reaction networks
[Abstract]
12:25 – 14:00 Lunch
Session chair: Y. Nishiura
14:00
Q. Tran-Cong
(Kyoto, Japan)
Reaction-induced hierarchical structures in multiphase polymer materials
14:35
F. Sagués
(Barcelona, Spain)
Langmuir monolayers: textures, flows and dynamic patterns
[Abstract]
15:10
M. Bonn
(Amsterdam, Netherlands)
Site-dependent surface reactivity investigated using nanostructured surfaces
[Abstract]
15:45 – 16:15 Coffee Break
Session chair: J. Hudson
16:15
R. Imbihl
(Hannover, Germany)
Pulses transporting potassium on a Rh(110) surface
16:50
D. Luss
(Houston, USA)
What causes temperature oscillations during CO oxidation in packed bed reactors
17:25
J. Lauterbach
(Newark, USA)
Local microdosing as means to control a nonlinear surface reaction
[Abstract]
19:00 Concert by
Bastian Schäfer
(Berliner Philharmoniker, First Violinist)
Matthew Hunter (Berliner Philharmoniker, Violist)
1. Georg Friedrich Händel, Chaconne in G Major
2. Wolfgang Amadeus Mozart, Duo KV 423, for Violin and Viola
Allegro
Adagio
Rondeau
(the concert takes place in the Ballsaal)
19:30 Dinner
Session chair: E. Bodenschatz
9:00
Y. Nishiura
(Sapporo, Japan)
Entropy and sensitivity of particle patterns in dissipative systems
[Abstract]
9:35
B. Fiedler
(Berlin, Germany)
Kinematics of forced meandering and drifting spirals
10:10
Y. Kevrekidis
(Princeton, USA)
Some examples of coarse-grained computation in complex systems
[Abstract]
10:45 – 11:15 Coffee Break
Session chair: G. Ertl
11:15
M. Marek
(Prague, Czech Republic)
Nonlinear dynamics of forced catalytic mufflers
Abstract:
Early experimental observations of chaotic behavior arising via period-doubling route for the CO
catalytic oxidation were repored on two spatial scales-on a nanoscale on Pt (110) catalyst and on
a mesoscale on Pt/γ-Al2O3 porous catalyst pellets more than fifteen years ago. Three-way
catalytic converter (TWC) using also Pt and/or other noble metals is the most common reactor for
detoxification of automobile exhaust gases containig CO, hydrocarbons and NOx. High
conversions to CO2 and N2 are required for operation of tens of milions of cars. This reactor is
typically operated with periodic variation of inlet oxygen concentration. Recently, a detailed
kinetic reaction scheme including more than 20 reaction steps has been proposed for the catalytic
CO oxidation, NOx reduction and hydrocarbons oxidation taking place in TWC. Question arises,
whether aperiodic spatiotemporal patterns can also occurr in TWC. Such patterns were not found
experimentally until now but it was found in simulations (1) with a detailed kinetic scheme, that
for periodically operated converters highest conversions can be found for certain aperiodic
regimes. Here we use both analytical methods (stoichiometric network analysis) and numerical
methods ( bifurcation analysis, continuation techniques and simulations) to determine necessary
conditions of existence of oscillations and their properties. For an unforced reactor lumped model
we report results of the stoichiometric network analysis of CO and NOx reaction subnetworks
determining feedback loops, which cause the oscillations within certain regions of parameters in
bifurcation diagrams. For a forced reactor system, numerical simulations of the CO oxidation
reveal the existence of period-doubling route to chaos. Dependence of the rotation number on the
amplitude and period of forcing shows a typical bifurcation structure of Arnold tongues ordered
according to Farey sequences, and positive Lyapunov exponents for sufficiently large forcing
amplitudes indicate the presence of chaotic dynamics. Multiple periodic and aperiodic time
course of outlet concentrations was also found in simulations using the lumped model with the
full TWC microkinetics. Numerical solutions of the distributed model in two geometric
coordinates with the CO oxidation subnetwork consisting of several tens of nonlinear PDE’s
show oscillations of the outlet reactor concentrations and, in the presence of forcing, multiple
periodic and aperiodic oscillations. Spatiotemporal concentration patterns illustrate the
complexity of processes within the reactor.
1) P. Kocí, M. Kubícek, M. Marek: Catalysis Today 98 (2004), 345-355
[close abstract]
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11:50
K. Krischer
(München, Germany)
Instabilities and pattern formation during electro-oxidation of H2-CO mixtures in a
fuel cell relevant system
[Abstract]
12:25
M. Falcke
(Berlin, Germany)
By chance or by the clock: How does intracellular calcium oscillate?
13:00
Y. Kuramoto
(Sapporo, Japan)
Early days of the research on coupled oscillators
13:30 Closing
Posters will be presented in the Ballsaal
