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Analysis of the effectiveness of the photocatalytic effect in surface treatments
Holubová, Petra ; Žák, Antonín (referee) ; Žižková, Nikol (advisor)
The thesis deals with the possible use of the photocatalytic effect in construction practice. Surfaces with this type of treatment have the ability of a so-called self-cleaning effect. Based on the research, the basic principles of the evaluation of photocatalytic substances and its possible applications were written down. Furthermore, the issue of staining facade plasters was outlined. The goal was to analyze the effectiveness of the photocatalytic effect in surface treatments. A photocatalyst of two types (anatase and rutile) and two rounds (2% and 5%) was added to the plaster mix. Next, the samples were contaminated with dyes and dust particles, and then the samples were placed in the QUV tester or exposed to outdoor climatic conditions. The photoactivity of individual plaster mixtures was evaluated on the samples based on color changes during testing. Plaster with TiO2 in the form of anatas dosed in 5%, according to a modified evaluation based on UNI 11259 and JIS 1703-2:2007 standards, photocatalytic properties, and thus a self cleaning process occurred.
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Molecular simulations of water - rutil interface
Hanke, Hynek ; Předota, Milan (advisor) ; Lísal, Martin (referee)
Study of structural and particularly dynamical properties of the interface of water with graphite and rutile surfaces points towards anomalous behavior of water molecules close to solid matter. Evaluation of statistical properties like translational and rotational diffusivity, residence times and autocorrelation functions of orientation vectors indicates that the translation and rotation of water molecules can be not only hindered, but also facilitated, according to the particular local density, interactions and and geometrical structure of the surface. The newly developed methods for the measurement of statistical rotational properties near to liquid-solid boundary overcomes the difficulties that are closely related to the measurement of dynamical properties in strongly inhomogeneous environment in a way, that can be applied to other model systems of this type.
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Molecular simulations of water - rutil interface
Hanke, Hynek ; Předota, Milan (advisor) ; Lísal, Martin (referee)
Study of structural and particularly dynamical properties of the interface of water with graphite and rutile surfaces points towards anomalous behavior of water molecules close to solid matter. Evaluation of statistical properties like translational and rotational diffusivity, residence times and autocorrelation functions of orientation vectors indicates that the translation and rotation of water molecules can be not only hindered, but also facilitated, according to the particular local density, interactions and and geometrical structure of the surface. The newly developed methods for the measurement of statistical rotational properties near to liquid-solid boundary overcomes the difficulties that are closely related to the measurement of dynamical properties in strongly inhomogeneous environment in a way, that can be applied to other model systems of this type.
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