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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"polyelectrolyte brushes"”.
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Simulation of Weak Polyelectrolyte Brushes
… the stimuli-responsive behavior of weak polyelectrolyte brushes (PEBs) and weak polyampholyte brushes (PABs) was examined with respect to pH, salt concentration, monomer sequence and grafting density. While PEBs have only acidic or basic monomers, PABs contain both types of monomers, …
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Molecular dynamics simulations of polyelectrolyte brushes
This thesis studies strong, completely charged polyelectrolyte brushes. Extensive molecular dynamics simulations are performed on different polyelectrolyte brush systems using local compute servers and massively parallel supercomputers. The full Coulomb interaction of charged monomers, counterions, …
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Synthesis and Characterization of Cationic Spherical Polyelectrolyte Brushes
… thesis, the preparation of cationic spherical polyelectrolyte brushes by photo-emulsion polymerization has been presented for the first time. The structure and properties of the cationic SPB, have been comprehensively investigated by dynamic light scattering and atomic force microscopy, and …
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Mathematical Modeling of Microscale Biology in Polyelectrolyte Brushes
… In this thesis, we develop such models for polyelectrolyte brushes using both steady state modified Poisson-Boltzmann models and transient modified Poisson-Nernst-Planck models that incorporate important ion-specific (Hofmeister) effects. The transient model enables observation of the …
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Generation of metal nanoparticles in spherical polyelectrolyte brushes and their application in heterogeneous catalysis
… thesis describes synthesis of spherical cationic polyelectrolyte brushes by “grafting from” technique. The spherical polyelectrolyte brushes have been used as “nanoreactors” for the synthesis of metal nanoparticles (Gold, Platinum and Silver). The catalytic activity of the resulting metal/polymer …
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Composites of Spherical Polyelectrolyte Brushes and Nanoparticles – Synthesis, Characterization and Their Use in Catalysis
… as a catalyst in aqueous solution. Spherical polyelectrolyte brushes (SPBs) with poly(2-trimethyl ammonium ethyl methacrylate chloride) (pTMAEMC) chains were used as support particles to stabilize the MnOxNP by immobilization. In a first step we established and investigated the method of the …
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Synthesis and Characterization of immobilized Gold Nanoparticles and Binary Gold Nanoalloys on Cationic Spherical Polyelectrolyte Brushes and their Application as a Catalyst
… synthesis for cationic and anionic spherical polyelectrolyte brushes (SPB) was introduced and a reproducible method for the synthesis was established (Chapter 3.1). For a better understanding of anionic SPB the complexation of the anionic polyelectrolyte chains with the cationic surfactant …
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Counterion Distribution around a Macroion in Polyelectrolytes Probed by Anomalous Small-Angle X-ray Scattering
A systematic and comprehensive study of polyelectrolytes in solution has been carried out using Anomalous Small Angle X-ray Scattering (ASAXS) in order to probe the counterion correlation around the macroion. In the course of this study, different polyelectrolyte systems such as, rod-like …
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Direct Measurements of Polyelectrolyte Brush Responses using Atomic Force and Optical Microscopy
In this thesis, so-called ”polyelectrolyte brushes” are addressed. The focus is on the investigation and understanding of the response properties of these polymer surfaces. For that purpose new methods are developed which combine force spectroscopy and optical microscopy. As well, established …
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Functional Cylindrical Polymer Brushes and Their Hybrids with Inorganic Nanoparticles
Various cylindrical polymer brushes were synthesized via a grafting-from strategy. Very long poly(2-hydroxylethyl methacrylate) backbones of the brushes were prepared by anionic polymerization (DPn=1500), esterified with an ATRP initiator, and subsequently the side-chains were grafted by atom …
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Rheology of polyelectrolyte multilayer modified suspension
… and cost effective production. Self-assembled polyelectrolyte multilayer modified colloids are a relatively new and promising colloidal system that is expected to overcome the previousmentioned drawbacks of the established systems. For the first time, this thesis explores themicro-macro …
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Weak polyacid brushes : synthesis, swelling behavior, complex formation and micropatterning
… polymer monolayers, so-called "polymer brushes", were covalently attached to solid planar surfaces and investigated with respect to their properties in contact with aqueous solutions of varying composition. <br> <br>The synthesis of these polymer brushes was performed in two steps. …
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Microfluidics at high-intensity X-ray sources: from microflow chips to microfluidic liquid jet systems
… for the microcontact printing of spherical polyelectrolyte brushes. Another example demonstrates the combination of nanotechnology and microstructuring techniques for developments towards sensoric applications.