Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.40: Poster
Thursday, March 29, 2007, 16:00–18:00, Poster D
Description of redox reaction and nanoparticle formation in glass with a reaction-diffusion system — •Knud Zabrocki1, Steffen Trimper1, Manfred Dubiel1, and Klaus-Dieter Schicke2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle (Saale), Deutschland — 2Experimental Department II, Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle (Saale), Deutschland
Nanoparticle formation of precious metals like silver and gold in glass is a current field of investigation because of its technically interesting applications. The size, shape and concentration of the particles and especially the control of these parameters during the formation process of the nanoparticles are of great importance for various applications. Detailed experiments on ion-exchanged glasses (EDX, TEM) build up the basis for our description of the formation process starting with a redox reaction of silver ions and glass containing ferrous ions. We use a system of reaction-diffusion equations to analyze the different concentration profiles of the reactants. Furthermore, the reaction-diffusion fronts are calculated where the particle formation as a clustering process sets in. The influence of the different parameters like reaction rate, diffusion coefficients and boundaries are studied in detail.