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The research on electrochemical and material characteristics new developed layered electrode materials for lithium-ion batteries
Kratochvíl, Miroslav ; Jirák, Tibor (referee) ; Sedlaříková, Marie (advisor)
The diploma thesis deals with electrode materials for lithium-ions accumulators, concretely layered materials prepared via new methods. The main objective of this work is dealing with new procedures prepare electrodes of newly developed layered electrode materials and subsequently their measure. Another challenge was a theoretical analysis of newly developed layered electrode materials for positive and negative electrodes and their preparation of new procedures. In this work the detailed procedures for the preparation of individual electrodes, electrolytes and other issues associated with these preparations. There were describing batteries of general, primary and secondary lithium cells, fuel cells, Lithium-ion batteries, layered materials forming the electrodes and of course the history these cells. Practical work is focused on separate measurements layered electrode materials prepared by new processes and assessment of results for individual layered materials. In the practical part has been made that the newly prepared layered electrode materials offer higher capacity and voltage.
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Preparation, characterization layered hydrogel electrospun materials and determination of transport characteristics
Šudáková, Anna ; Kalina, Michal (referee) ; Smilek, Jiří (advisor)
V dnešní době je stále velký problém efektivního dodávání léčiv do lidského těla. Stále se jedná o příjem léčiva s konstantní koncentrací, která se uvolní v krátkém čase, což není velice efektivní. Proto došlo k zaměření se na vývoj nového způsobu dodávání léčiv pomocí tzv. postupného uvolňování, které by zamezilo rychlému uvolnění velké koncentrace léčiva do těla. Tento problém je zde řešen pomocí kompozitního materiálu složeného z netkané textilie, která zde funguje jako nosič hydrogelu, který v tomto případě prozatím nese barvivo pro stadium kinetiky uvolňování. Netkaná textilie z polypropylenu je zde zkoumána ve spojení s hydrogely alginátu, chitosanu a želatiny. Materiály byly studovány na to, jestli, a jak moc docházelo k uvolňování samotného hydrogelu z vrstevnatého materiálu pomocí uvolňování do prostředí vody. Toto bylo měřeno pomocí metody viskozimetrie. Následně byla zjišťována kinetika uvolňování skrz materiály s různým počtem vrstev pomocí metody difúzních cel. Poslední část práce se zaměřuje na studium uvolňování barviva (methylenové modři) z vrstevnatého materiálu, který obsahuje právě gradient tohoto barviva.
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Design of layered, (C,N,S)-based donor-acceptor materials
Kochergin, Yaroslav ; Bojdys, Michael Janus (advisor) ; Starý, Ivo (referee) ; Thomas, Arne (referee)
Since 2016 there are world-wide more mobile phone contracts than people on the planet, and in all these devices critical raw materials (CRMs) are incorporated.[1] For instance, commonly used silicon-based transistors are limited in their chemical modularity. Inorganic materials for solar cells and photocatalysis suffer from critical raw elements content, low apparent quantum efficiencies and photodegradation. Hence, considerable research interest in recent years is focused on development of new high-performance devices for optical and electronic applications that avoid CRMs entirely. To address all these problems materials chemists are exploring for new pathways towards making more sustainable and reliable materials. In that respect, porous organic π- conjugated polymers (POPs) are among the most promising candidates and have gained tremendous attention in materials research over the last decade, especially in the fields of photocatalysis, opto- and electrochemical sensorics, and microelectronics. Synthetic diversity, chemical and physical stability, as well as comparatively low production costs and scalability enable POPs to overcome the drawbacks of inorganic materials. Moreover, the absence of rare earth elements in the purely organic structure of POPs makes these materials more environmentally...
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The research on electrochemical and material characteristics new developed layered electrode materials for lithium-ion batteries
Kratochvíl, Miroslav ; Jirák, Tibor (referee) ; Sedlaříková, Marie (advisor)
The diploma thesis deals with electrode materials for lithium-ions accumulators, concretely layered materials prepared via new methods. The main objective of this work is dealing with new procedures prepare electrodes of newly developed layered electrode materials and subsequently their measure. Another challenge was a theoretical analysis of newly developed layered electrode materials for positive and negative electrodes and their preparation of new procedures. In this work the detailed procedures for the preparation of individual electrodes, electrolytes and other issues associated with these preparations. There were describing batteries of general, primary and secondary lithium cells, fuel cells, Lithium-ion batteries, layered materials forming the electrodes and of course the history these cells. Practical work is focused on separate measurements layered electrode materials prepared by new processes and assessment of results for individual layered materials. In the practical part has been made that the newly prepared layered electrode materials offer higher capacity and voltage.
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