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Non-mononotonical behaviour of reaction diffusion front width. Simulation studies in frame of dynamic lattice liquid (DLL) model

Polanowski P., Kozanecki M., Pakula T.

Materials Science Poland

2006

Vol. 24, No. 2/2

453--466

Investigations of anomalous behaviour of the reaction diffusion front for A + B › 2C (inert) and A + B › CC processes are presented. Computer simulation studies were performed using the model of dynamic lattice liquid (DLL) for both two- and three-dimensional cases. Special attention was paid to situations when the mobility of products C and CC significantly differs from the mobilities of reactants. Under such conditions, new kinds of dynamical behaviour were detected. The results obtained indicate that it is necessary to re-formulate the classical description of reaction diffusion front problem. The generalized formalism suggested in the paper should allow a proper description of dynamics of the reaction front over the whole time range including the case when the mobilities of reactants and products are differ

Zone casting - a universal method of preparing oriented anisotropic layers of organic materials

Tracz A., Pakula T., Jeszka J. K.

Materials Science Poland

2004

Vol. 22, No. 4

415--421

A method for the preparation of oriented, anisotropic layers of soluble molecular materials on substrates that were not pre-oriented (so-called zone casting) is presented. The method consists in casting a suitable solution, continuously supplied by a nozzle, onto a moving substrate. Solvent evaporation takes place from the surface of the meniscus formed between a special flat nozzle and the substrate. Due to a gradient of the solute concentration, its solidification proceeds in a narrow zone under highly anisotropic conditions. The conditions of stationary deposition and the influence of various parameters on the process, such as casting speed, the diffusion coefficient, evaporation rate, are discussed. It is shown that the zone casting can be used to obtain anisotropic layers of many different low-molecular-weight and macromolecular materials.