Global ETD Search
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 20 of 31 for “"surface groups"”.
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Separability within alternating groups and randomness
… promotes known residual properties of free groups, surface groups, right angled Coxeter groups and right angled Artin groups to the situation where the quotient is only allowed to be an alternating group. The proofs follow two related threads of ideas. The first thread leads to `alternating' …
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Cellular interactions with hydrogels
… sequence distribution were found to affect surface properties and this may explain the poor levels of cell adhesion seen on NVP/MMA copolymers. Surface free energy is shown to be dependent on the polar and non polar groups present along the backbone chain of the polymers. Dehydrated and …
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Computations and lower bounds for scl and the relative Gromov seminorm
… of stable commutator length, an invariant of groups that measures homological complexity and is connected to several notions of negative curvature in geometric group theory. A first aspect of this is to give exact computations, motivated by questions of rationality. A particular case of …
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Chemistry directed assembly of multilayered polymer thin films and colloidal particles
… have been directed to different regions of a surface based on both electrostatic and secondary interactions between the polymer and the surface. This concept of adsorption directed by surface chemistry is universal, in that the same sets of rules derived for polymeric systems can also be …
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Multifunctional chromatography supports
… in route 1 by reacting bromine with the allyl groups at the surface, followed by the addition of sodium hydroxide. Creation of the outer layer in route 2 was achieved by oxidation of surface groups with potassium permanganate. In both synthesises the allyl groups remaining were reacted with …
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Surface Functionalisation and Characterisation of Cellulose Nanocrystals
… materials. All these applications depend on the surface properties of CNCs, therefore reliable quantitative characterisation methods of these properties are required. The chemical groups available at the CNC surface are a function of the extraction process used. For CNCs extracted with sulfuric …
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Development of Dendrimer-based Technologies for Phosphoproteomics and Glycoproteomics in Biomarker Discovery
… chemically well-defined structure and functional surface groups – to facilitate the detection and quantification of PTMs using several biochemical assays and mass spectrometry-based shotgun proteomics.
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ΡΥΘΜΙΣΗ ΤΩΝ ΕΠΙΦΑΝΕΙΑΚΩΝ ΦΟΡΤΙΩΝ ΚΑΤΑΛΥΤΙΚΩΝ ΦΟΡΕΩΝ ΜΕ ΤΗ ΧΡΗΣΗ ΤΡΟΠΟΠΟΙΗΤΩΝ
… FORREGULATING THE ZERO POINT OF CHARGE (ZPC), SURFACE ACIDITY CONSTANTS AND THE CONCENTRATION OF THE CHARGED SURFACE GROUPS, DETERMINED POTENTIOMETRICALLY, OVERA WIDE PH RANGE. THE ADSORPTION OF IONIC SPECIES CONTAINING THE CATALYTICALLY ACTIVE IONS MO(VI), CO(II) AND NI(II), ON THE SURFACE OF …
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Embeddings of cat(0) cube complexes in products of trees
In ‘Groups acting on connected cubes and Kazhdan’s property T’, [29], Niblo and Roller showed that any CAT(0) cube complex embeds combinatorially and quasi-isometrically in the Hilbert space '2(H) where H is the set of hyperplanes. This Hilbert space may be viewed as the completion of an infinite …
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Graphs Of Free Groups And Their Measure Equivalence.
… Group Theory of an interesting class of groups that can be obtained as graphs of free groups. These groups are called Quadratic Baumslag-Solitar groups, and are defined by graphs of groups that have infinite cyclic edge groups, and whose vertex groups are either infinite cyclic, or …
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Electrical Response of Carbon Nanotubes Under Electrolyte
… properties of carbon nanotubes regarding surface chemistry, carrier transport, current fluctuations, and electron-phonon interactions have been explored by utilizing electrolyte top gated carbon nanotube based devices. Individual semiconducting nanotubes have shown a negative threshold …
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Synthesis and Crystallization of Anisotropic Polymer Colloids
… and protrusion parts are coated with different surface groups such that the particles maybe given charge anisotropy by varying suspension pH. To obtain the second type of dicolloid, polystyrene seed spheres are swollen with N-isopropylacrylamide (NiPAM) to give particles with a polystyrene seed …
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Thermophoresis in Colloidal Suspensions
… of interfacial fluid properties at the colloidal surface. Chapter 4 presents steady-state measurements of functionalised colloids in a temperature gradient, showing how the addition of molecular surface groups increases the experimental complexity of thermophoretic motion. The relaxation process …
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Kr-F laser surface treatment of poly(methyl methacrylate), glycol-modified poly(ethylene terephthalate), and polytetrafluoroethylene for enhanced adhesion of Escherichia Coli K-12
… interactions are most influenced by substrate surface free energy, surface chemistry, topography, and rigidity[1]. Alteration of these properties through surface treatment has become a common approach to attain the desired cellular interaction. This study investigates Kr-F excimer laser(248 nm) …
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One-pot synthesis and characterisation of alkyl functionalised silicon nanoparticles, using an inverse micelle based method.
… the presence of alkoxy impurities in the surface chemistry. This was caused by the introduction of alcohol to the system in order to quench the lithium aluminium hydride (LiAlH4) reducing agent. Because of this problem a further refined synthesis approach is reported, whereby suitable …
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Controlling Colloidal Stability using Highly Charged Nanoparticles
… polystyrene latex with either sulfate or amidine surface groups. Effective zeta potentials were measured with nanoparticle concentrations ranging from 0.001% to 0.5% vol. Adsorption levels were determined through direct SEM imaging of the silica microparticles, showing that the nanoparticles …
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Catalysts for the Positional Isomerization of Internal, Long-Chain Olefins
… only gradually deactivating due to poisoning by surface oligomers. Amberlyst® 70, Amberlyst® XN1010, ZSM-35 and SAPO-11 were evaluated because of their lower acid site densities and degree of crosslinking (for the PS-DVBs). None of these catalysts were optimal for various reasons. Both beneficial …
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Tensile Bond Strength of Light-Activated Composite for Bonding Metal and Ceramic Brackets
… dividing 88 human maxillary premolars into four groups of 22 specimens each. Each group had either metal or ceramic brackets bonded with either two-paste or light-activated adhesive. After bonding, specimens were thermocycled and stored in a humidor set at 37°C for seven days. Ceramic bracket …
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Two-dimensional material inks and composites for printed electronics and energy
… films of nanomaterials on three-dimensional (3D) surfaces. I then demonstrate that it is possible to create large area (∼750 cm2) transparent conducting films around curved surfaces with spray coating enabling a semi-transparent (around 360°) spherical touch sensor for interactive devices. Chapter …
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Structure determination of bacteriophage [phi]21 N-peptide and boxB RNA complex by NMR spectrocsopy
… The peptide-RNA interface is defined by surface complementarity of polar and non-polar interactions. Comparison of the [phi]21 complex to the [delta] and P22 structures yields important information about RNA-protein interaction and discrimination. All three peptides bind the RNA stems …
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