Academic literature on the topic 'Porézní struktura'

The thesis targets to preparation a foam ceramics suitable for supporting, catalytic and biological applications. Theoretical part deals with methods of preparation, properties and applications of foam ceramics. Experimental part of work is focused on preparation foams by template method using polymer foam. Properties of ceramic slurry were evaluated according to discharge time of Ford cup. Foam structure is assessed using images and mechanical properties are judged by compressive tests.

The work deals with the preparation and mechanical properties of coated Bioglass® 45S5 based foam materials with open porosity. The samples have been fabricated applying the replication method with use of polyurethane foam. Furthermore, these samples were coated in order to increase the strength characteristics and crack resistance. Polyvinylalcohol and PVA with cellulose microfibrils have been used as coating. Besides microstructural parameters of investigated materials using the SEM images strength characteristics in compression and in tension were also quantified.

Metal additive technology allows to create objects with complex shape that are very difficult to produce by conventional technologies. An example of such component is a porous structure which is composed of periodical truss cells. This diploma thesis deals with the prediction of the mechanical properties of very small lattice structures made of additive manufacturing technology Selective Laser Melting. Using the proposed test specimens it was found that real dimensions of the trusses varies with size and orientation to the base platform. It was proposed and tested samples for rod tensile test made of SLM. Based on the real information about dimensions and mechanical properties of rods were predicted mechanical properties of lattice structures. A lot of mechanical tests were carried out to obtain the real mechanical properties. Test results and conclusions are described in the thesis.

Tato diplomová práce je zaměřená na výrobu Au-PANI-Au nanodrátů. Prezentovaná výroba nanodrátů je založená na elektrochemické depozici různých kovů a polymerizaci polyanilínu do porézních šablon z porézní anodické aluminy připravených anodizací hliníku. Teoretická část pojednává o základech elektrochémie a porézní anodické aluminy.

Porous frameworks are a class of materials including metal-organic frameworks (MOFs), covalent organic frameworks (COFs) or conjugated microporous polymers (CMPs). Porous frameworks are widely studied as materials for gas storage and separation, catalysis, sensing, drug delivery, water purification, microelectronics, etc. The results presented in the Thesis document that porous frameworks with photoactive porphyrin molecules incorporated in the structure are photosensitizers of singlet oxygen, O2(1 g), and can be used for photodynamic applications including the construction of antibacterial coatings and of organized structures for photodynamic therapy. The Thesis presents a complex study of photophysical properties of porphyrin-based CMPs and COFs and, for the first time, demonstrates the application of porphyrin-based COFs for photodynamic inactivation of microorganisms. The CMPs and COFs were prepared by Suzuki-Miyaura cross-coupling and Schiff base formation, respectively. The materials were characterized by IR and solid-state NMR spectroscopy. The porosity of the materials was determined via N2 adsorption. The CMPs are microporous with pore sizes varying from 1.4 to 2.1 nm and with specific surface areas up to 624 m2 g-1 . On the other hand, the porphyrin-based COFs are only slightly...