National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Plasma treatment of fabrics
STEHLÍK, Radim
The thesis deals with the surface modification of cotton fabric by low-pressure micro-wave plasma discharge. The main materials used for this experiment are cotton fabrics and hexamethyldisiloxane. The experiment itself is focused on the modification of cotton fabric to improve hydrophobic atributes. An argon process gas was used in the surface modification. The individual treated samples were operated with changes in process gas flow and the time during which the above-mentioned modifications was performed. Two methods were used to analyze the results of the experiment. The first one was aimed at determining changes in hydrophobic atributes in the form of wetta-bility in an unmodified sample compared to other modificated samples using the drop-let method. An electron microscope was used for the subsequent study of possible changes in surface topography. From the point of view of the examined results, the difference in hydrophobic properties was observed when using the droplet method to-gether with the change in the topography of the surface obtained on the electron mi-croscope in the cotton samples examined. The actual evaluation of individual methods points to the desirable changes in modified cotton compared to unmodified cotton. Further information regarding the results of the experiment, depending on the changes in individual parameters in the cotton treatment process using low pressure microwave plasma discharge, are presented in thesis.
Technical aspects of measurement using IR spectrophotometer Buck 500
STEHLÍK, Radim
The work deals with IR spectrophotometry and technical aspects of IR spectrophotom-eter Buck 500. The first chapter of the theoretical part is dedicated to textiles produced from natural fibres. The chapter carries out a survey concerning cotton measured further in the experimental part. The second chapter describes IR spectrophotometry principle. It brings the basic terminology, for instance transmittance, absorbance, wavelength, wave-speed, etc. The next chapter of the theoretical part is focused on the description of basic components of IR spectrophotometer Buck 500. The theoretical part further explains the methods used for analysis of solid agents (KBr, ATR). The experimental part provides a comprehensive overview on how to install, operate and maintain the instrument as well as its compatibility with IT technology. It further describes the process of gaining spectra using GRAMS/AI programmes. The next chapter describes the spectra measurement methods on IR spectrophotometer Buck 500. The work mentions the process of KBr tablets production. The last chapter deals with the evaluation and interpretation of individual spectra based on the number of peaks with respect to wave-speed. The final part points out the difference between modified and non-modified cotton.

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2 Stehlík, Richard
1 Stehlík, Robert
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