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Porphyrin-layered double hydroxide hybrids as novel photofunctional materials
Káfuňková, Eva ; Lang, Kamil (advisor) ; Pinkas, Jiří (referee) ; Bujdák, Juraj (referee)
This Ph.D. Thesis is based on publications to which the author contributed considerably. The list of the publications is attached at the end of this text. This work describes preparation and photophysical properties of hybrid materials derived from layered double hydroxides (LDH) containing Zn2+ /Al3+ or Mg2+ /Al3+ cations. The materials were prepared in the form of powders or thin films. In the first part of my work, photosensitizing porphyrins have been intercalated into ZnRAl and MgRAl LDH (R = 2, 3, 4) using anion-exchange, rehydration, and coprecipitation procedures. According to the obtained results of X-ray analysis, the orientation of the equatorial plain of the porphyrin molecules is nearly perpendicular to LDH layers and fosters the photosensitizing properties of the hybrid materials. Furthermore, the porphyrin-LDH hybrids were used as nanofillers and nanocontainers in eco-friendly polymers, polyurethane (PU) and poly(butylene succinate) (PBS). The porphyrin-LDH material is well dispersed in PU polymer (nanofiller function) to form transparent colored films while porphyrins remain intercalated between LDH layers (nanocontainer function). The polymers allow oxygen diffusion. The second part has been dedicated to investigation of photophysical properties of the porphyrin-LDH powders and the...
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Layered Transition Metal Hydroxides: Delamination and Properties
Hyklová, Barbora ; Lang, Kamil (advisor) ; Zima, Vítězslav (referee) ; Bujdák, Juraj (referee)
Charles University Faculty of Science Study programme: Inorganic Chemistry Mgr. Barbora Hyklová Layered Transition Metal Hydroxides: Delamination and Properties Extended abstract Supervisor: Ing. Kamil Lang CSc., DSc. Supervisor-Consultant: RNDr. Jan Demel PhD. Prague, 2017 Layered transition-metal hydroxides have attracted increasing attention as promising active electrode materials for electrochemical energy storage and conversion device due to facile preparation and modification, good tunability, high capacitance capability, fast reversible redox reactions, and cost effectiveness. Many reported hierarchical architectures based on nickel and cobalt hydroxides are composed of bulky nanoplatelet-like aggregates; however, the nanomorphology and behavior of the separated hydroxide nanosheets is much less known. Figure 1. Scheme of layered nickel or cobalt hydroxide delamination and subsequent restacking on conductive HOPG support. In this respect, the dissertation thesis reports characterization and electrochemical performance of nickel, nickel-cobalt, and cobalt hydroxide nanosheets, synthesized by an economical and environmentally friendly method based on delamination of corresponding layered hydroxides in water (Figure 1). For this purpose, lactate and nitrate layered hydroxides were prepared by two...
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Porphyrin-layered double hydroxide hybrids as novel photofunctional materials
Káfuňková, Eva ; Lang, Kamil (advisor) ; Pinkas, Jiří (referee) ; Bujdák, Juraj (referee)
This Ph.D. Thesis is based on publications to which the author contributed considerably. The list of the publications is attached at the end of this text. This work describes preparation and photophysical properties of hybrid materials derived from layered double hydroxides (LDH) containing Zn2+ /Al3+ or Mg2+ /Al3+ cations. The materials were prepared in the form of powders or thin films. In the first part of my work, photosensitizing porphyrins have been intercalated into ZnRAl and MgRAl LDH (R = 2, 3, 4) using anion-exchange, rehydration, and coprecipitation procedures. According to the obtained results of X-ray analysis, the orientation of the equatorial plain of the porphyrin molecules is nearly perpendicular to LDH layers and fosters the photosensitizing properties of the hybrid materials. Furthermore, the porphyrin-LDH hybrids were used as nanofillers and nanocontainers in eco-friendly polymers, polyurethane (PU) and poly(butylene succinate) (PBS). The porphyrin-LDH material is well dispersed in PU polymer (nanofiller function) to form transparent colored films while porphyrins remain intercalated between LDH layers (nanocontainer function). The polymers allow oxygen diffusion. The second part has been dedicated to investigation of photophysical properties of the porphyrin-LDH powders and the...
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