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Modelling Power Line Communication using Network Simulator-3
Pánek, Jiří ; Endrle, Pavel (referee) ; Mlýnek, Petr (advisor)
The semestral thesis deals with power line communication and its simulation in Network Simulator-3. The first part includes a general description of PLC, summarizes its division and the relevant standards. The next part describes graphical user interface, its options and several simulation topologies. The third part is a description of each simulated examples in NS-3 and proposal for their extension. It also includes analysis of the types of interference in PLC and partial extension.
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Self-assemblies based on hydrophilic polymers in aqueous media
Fanova, Anastasiia ; Štěpánek, Miroslav (advisor) ; Pánek, Jiří (referee) ; Angelov, Borislav (referee)
This doctoral thesis is devoted to investigation of self-assemblies based on hydrophilic polymers (both homopolymers and block copolymers) in aqueous media. Specifically, we focused on two classes of systems: (i) hydrophilic polymers whose self-assembly in aqueous solutions is driven by association of terminal hydrophobic groups and (ii) double hydrophilic block polyelectrolytes whose self-assembly occurs via electrostatic complexation of polyelectrolyte blocks. For characterization of formed assemblies, we mostly used different scattering techniques (light scattering, small-angle X-ray scattering) in a combination with a number of supplementary methods including microscopy, fluorometry and calorimetry. Keywords: hydrophilic polymers, block copolymers, association, self-assembly, micelles, scattering
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Self-assembled polymer systems responsive to external stimuli for biomedicine
Babuka, David ; Štěpánek, Petr (advisor) ; Pánek, Jiří (referee) ; Sedláček, Jan (referee)
Stimuli-responsive self-assembled polymer nanoparticles are becoming increasingly more important tools in nanomedicine. In this thesis we studied two large sets of polymer samples designed to be capable of such self-assembly. Polymers in the first set, containing poly(2-methyl-2-oxazoline) or poly[N-(2-hydroxypropyl) methacrylamide] hydrophilic blocks and poly[N-(2,2-difluoroethyl)acrylamide] thermoresponsive block, were designed to act as 19F MRI contrast agents. Polymers in the second set were designed as drug delivery systems and were based on 2-methyl-2-oxazine for hydrophilic parts and 2-propyl-2-oxazoline for thermoresponsive or 2-butyl-2-oxazoline for hydrophobic parts. Both sets of copolymers were prepared with various ratios of monomers in their blocks and the second set was also prepared with gradient chain architecture. Properties of their self-assembled systems were studied in detail and compared with regard to their potential for biomedical applications. The primary used method of analysis was dynamic light scattering supported by a vast array of methods including static light scattering, small angle X-ray and neutron scattering, nuclear magnetic resonance and others. From the investigated copolymers the most promising candidates for biomedical applications were selected and highlighted.
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Self-assembly of polymers with amphiphilic compounds (surfactants) in aqueous solutions
Delisavva, Foteini ; Procházka, Karel (advisor) ; Štěpánek, Petr (referee) ; Pánek, Jiří (referee)
Title: Self-assembly of polymers with amphiphilic compounds (surfactants) in aqueous solutions Abstract: This PhD Thesis is devoted to the co-assembly in systems containing electrically charged polymers (polyelectrolytes and block copolymers containing polyelectrolyte sequences). I studied the interactions between block copolymers and oppositely charged surfactants in aqueous solutions, and the structure and properties of co-assembled nanoparticles by a combination of several experimental methods. I found that the spontaneous formation, solubility and stability of complex nanoparticles depend not only on the electrostatic attractive forces but also on the hydrophobic effects. In a major part of my Thesis, I studied the interaction of polyelectrolytes with oppositely charged gemini surfactants (containing two charged head-groups interconnected by a short linker and two hydrophobic tails) which is a relatively new topic - much less studied than the co-assembly with conventional single tail surfactants. Better understanding of the formation and properties of complexes containing gemini surfactants and polymers provides knowledge that should lead to novel tailor-made nanoparticles with desired properties for applications in medicine and new technologies (including nano-technologies). We have shown that the...
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Polimeric nanoparticles stabilised by surfactants
Pánek, Jiří ; Štěpánek, Petr (advisor) ; Pleštil, Josef (referee) ; Sedlák, Marián (referee)
Polymeric nanoparticles stabilised by surfactants Doctoral Thesis Abstract Jiří Pánek Supervisor: RNDr. Petr Štěpánek, DrSc. PRAGUE 2010 CHARLES UNIVERSITY IN PRAGUE Faculty of Science Department of Physical and Macromolecular Chemistry INSTITUTE OF MACROMOLECULAR CHEMISTRY AS CR, v. v. i. Department of Supramolecular Polymer Systems Polymerní nanočástice stabilizované surfaktanty Souhrn disertační práce Jiří Pánek Školitel: RNDr. Petr Štěpánek, DrSc. PRAHA 2010 UNIVERZITA KARLOVA V PRAZE Přírodovědecká fakulta Katedra fyzikální a makromolekulární chemie ÚSTAV MAKROMOLEKULÁRNÍ CHEMIE AV ČR, v. v. i. Oddělení nadmolekulárních polymerních soustav 1 INTRODUCTION In the light of recent development, nanotechnology is the driving force of current research of new materials both in materials science and in biomedicinal applications. Nanomaterials can be constructed either by a top-down approach when the desired structure is produced in an already existing material or by a bottom-up approach when the required configuration is made by self-assembly of building blocks using various physicochemical interactions. Polymers and copolymers represent an ideal system for engineering of self-assembled nanomaterials since they offer a wide range of combinations of building materials that may serve for this purpose. The aims of...
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Modelling Power Line Communication using Network Simulator-3
Pánek, Jiří ; Endrle, Pavel (referee) ; Mlýnek, Petr (advisor)
The semestral thesis deals with power line communication and its simulation in Network Simulator-3. The first part includes a general description of PLC, summarizes its division and the relevant standards. The next part describes graphical user interface, its options and several simulation topologies. The third part is a description of each simulated examples in NS-3 and proposal for their extension. It also includes analysis of the types of interference in PLC and partial extension.
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