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Release Studies on Mesoporous Microcapsules for new Corrosion Protection Systems

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Walczak,  Magdalena
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Walczak, M. (2007). Release Studies on Mesoporous Microcapsules for new Corrosion Protection Systems. PhD Thesis, Ruhr-Universität Bochum, Bochum.


Cite as: https://hdl.handle.net/21.11116/0000-000D-848A-2
Abstract
The addresses a release system, devised as an element of corrosion protection at cut-edge of coated steels. The release system consists of a dispersion of mesoporous particles, which are filled with functional molecules (Rhodamine 6G, corrosion inhibitors). The kinetics of release has been characterized both microscopically on single particles and spectroscopically for the entire dispersion. In the model system SBA-3 (fibres and cone-like particles) it has been found that transport perpendicular to the pore direction (cross-wall transport) is the rate-determining factor. The associated diffusion coefficient has been determined. Transport along the pores has also been studied and shows the diffusion coefficient of ca. one order of magnitude higher. Further, in a series of particle modifications the release times could be relatively flexibly adjusted.