Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 35: Reaction-Diffusion Systems

DY 35.6: Vortrag

Donnerstag, 3. April 2014, 16:30–16:45, HÜL 186

Influence of polymers on silica gel structure and patterns of Belousov-Zhabotinsky reaction — •Claudia Lenk and J. Michael Köhler — Institut für Chemie und Biotechnik, TU Ilmenau, Germany

Spatio-temporal patterns formed in oscillatory chemical, biological or medical systems resemble the state of the system and their analysis reveals thus information about the underlying processes. Thereby the structure of the media plays an important role for the resulting patterns. To investigate the influence of the structure, we perform experiments of the well-known Belousov-Zhabotinsky (BZ) reaction in a silica gel, where the catalyst Ferroin is immobilized in predefined patterns. To enhance the immobilization different polymers are added to the gel matrix. The influence of the polymers on the gel structure is analyzed by scanning electron microscope and Raman measurements. The best immobilization of Ferroin is observed for gels with polyethylene glycol or poly(styrenesulfonic acid-co-maleic acid) sodium salt. Since, e.g., polyethylene glycol can yield standing wave patterns [1], changes of the oscillatory parameters, like frequency and conduction velocity of the BZ waves, are studied. The relation of these changes to the diffusion properties of the BZ reagents and the chemical and electrical properties of the polymer will be discussed.
[1] D. Cuinas et al., J. Chem. Phys. 128, 244907 (2008).