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• W2186271878 abstract "The thesis consists of two major parts. The first part contains a theoretical-experimental study of confocal micro-Raman spectroscopy on hybrid polymer coatings and an application of this spectroscopic method on PDMS-membranes. The theoretical-experimental study includes the application of a model that describes the influence of the refraction effect on the focus length on confocal Raman experiments, and the development of a new model that additionally takes into account the effect of diffraction on the focus dimensions. A parallel comparison between these two theoretical approaches and experimental data has been also drawn and a better agreement between theory and experiment was observed, when both refraction and diffraction effects were considered. Further, confocal resonance micro-Raman spectroscopy has been applied to characterise the diffusion processes of pharmacologically relevant molecules (b-carotene dissolved in dimethylsulfoxide) through a polydimethylsiloxane (PDMS)-membrane. The diffusion rate as a function of the measurement depth and diffusion time as well as the concentration gradient under a steady flux have been determined. The measurements shown that the confocal micro-Raman technique is a powerful tool to investigate the kinetics of diffusion processes within a membrane before the steady state has been reached. The second part of the thesis contains infrared and Raman spectroscopic studies of copper and iron doped B2O3-Bi2O3 glass systems. These studies were performed to obtain specific data regarding their local structure and the role played by dopant ions on boron and bismuthate units. The changes of B2O3 and Bi2O3 structural units due to the relaxation of the amorphous structure, which was induced in these samples by the thermal treatment, were also evidenced." @default.
• W2186271878 created "2016-06-24" @default.
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• W2186271878 date "2002-01-01" @default.
• W2186271878 modified "2023-09-24" @default.
• W2186271878 title "Theory and applications of confocal micro-Raman spectroscopy on hybrid polymer coatings and PDMS membranes and spectroscopic studies of doped B 2 O 3 -Bi 2 O 3 glass systems" @default.
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