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]
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
Abstract:
A new kind of nonlinear nonequilibrium patterns - twisted spiral
waves - is predicted for periodically forced oscillatory
reaction-diffusion media. We show furthermore that, in such media,
spatial regions with modified local properties may act as traps where
propagating waves can be stored and released in a controlled way.
Underlying both phenomena is the effect of the wavelength-dependent
propagation reversal of traveling phase fronts, always possible
when homogeneous oscillations are modulationally stable without
forcing. The analysis is performed using as a model the complex
Ginzburg-Landau equation, applicable for reaction-diffusion systems
in the vicinity of a supercritical Hopf bifurcation. [1]
We consider two examples for a realistic model describing reaction-diffusion
systems with local oscillatory dynamics under the
conditions of periodic forcing. Using the Krischer-Eiswirth-Ertl
model for the catalytic CO oxidation on Pt(110) we demonstrate
that phase front reversal can be expected under periodic variation
of the CO partial pressure. Temperature heterogeneities on the
Pt surface can be used to trap phase fronts.
Another example for a more realistic model is the Oregonator which
describes the light-sensitive BZ reaction. Our simulations of the
Oregonator show that wavelength-dependent front propagation reversal
is possible when the light intensity is varied periodically. It can
be expected as well in the regime beyond the canard explosion, where
the nature of the oscillations is relaxational rather than harmonic.
Phase front traps can be realized by spatial variation of the forcing
intensity.
[1] O. Rudzick and A. S. Mikhailov,
Phys. Rev. Lett. 96, 018302 (2006)
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last modified: June 7, 2006 / Oliver Rudzick