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 25 for “"Orientational order"”.
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Investigating the orientational order in smectic liquid crystals.
… been characterized by optical techniques. In order to perform the resonant X-ray diffraction experiment, we have added C9 and C11 compounds to the binary mixtures and pure 10OHF. In two of the studied mixtures, a new smectic-C∗ liquid crystal phase with six-layer periodicity has been …
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Studies of the orientational order and bilayer thickness in biological and model membranes
The hydrocarbon order of a membrane bilayer in the hydrocarbon region is suggested to play a fundamental role in maintaining functional integrity in the biological membrane system, Acholeplasma laidlawii strain B. The hydrocarbon order profile, which can be considered to be linearly related to …
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Theoretical studies of lipid-protein interactions in biological membranes
… with increasing density. There is no long range orientational order within the lipids but the local orieritational order increases with increasing density. No first order phase transitions are observed though a glassy solid is observed at high densities. The properties of the bulk lipid are …
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Nuclear magnetic resonance and rheo-NMR investigations of wormlike micelles, rheology modifiers, and ion-conducting polymers
… self-diffusion experiments to analyze alignment, orientational order, elaborate rheological behavior, and ion transport in polymer films and complex fluids. We employed self-diffusion and quadrupolar deuterium NMR methods to water-swollen channels in Nafion ionomer films commonly used in fuel …
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Effect of the position of the double-bond in monounsaturated phospholipids on the dynamics of model membranes
… })e a gooel rel)Orter of the cllain Illoleclilar order. SI)ectral second 11I0I1lents were llsed to Illonitor tIle La -+ HII I)hase transition, which was fOllnd to ])e ])road (2-6°C), with a slight llysteresis on heatiIlg/cooling. The orientational order I)rofiles were nleasllred 1lSiIlg 2H …
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Synthesis and Crystallization of Anisotropic Polymer Colloids
… spherocylinders forming plastic crystals and orientationally ordered crystals in three dimensions, and dumbbells only ordering in two dimensions. However, it is more difficult to form colloidal crystals with both types of shape anisotropie particles than with spheres. Crystals of …
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Geometric and Topological Aspects of Soft & Active Matter
… in terms of defects and geometric frustration in ordered media, and protected edge states in topological insulators. In this thesis, I will argue that such an approach successfully identifies the relevant physics in metamaterials and living matter as well, even when traditional techniques fail. I …
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CRITICAL DYNAMICS OF LIQUID CRYSTAL ABOVE THE ISOTROPIC - NEMATIC PHASE TRANSITION
… is studied. The phase transition is of first-order, but nearly critical. Near the transition point the correlation length (zeta) of molecular orientational order could be comparable to the inverse of a light scattering momentum transfer k. We study the non-linear effects in the dynamics of …
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Adsorption and electrostatic potentials at the electrochemical interface
… at the interface, and disrupts the water's orientational order. Lastly, cross-sections of the 3D Poisson potential parallel to the electrode surface reveal large heterogeneity in Poisson potential values as a result of adsorbates. This suggests that 1D electrostatic potential profiles are …
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Theory of phase transitions in liquid crystals and plastic crystals
… field approximation there are three ordered phases: the smectic C phase in which molecules are rotationally ordered but free to translate randomly; the smectic B phase in which molecules rotate freely around their long molecular axes but are positioned on a two dimensional hexagonal …
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Vibrational Spectroscopy and Atomic Force Microscopy Studies of Silane Adsorption onto Silicon and Glass.
… conclusion was that the cast silane layers were orientationally disordered, whilst the self-assembled layers showed a greater orientational order. In situ FTIR-ATR spectroscopy was employed to study the adsorption of these long-chain silanes at a silica-deuterated toluene interface. The silica …
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Microstructure of Systems with Competition
… Voronoi construction, calculation of bond orientational order parameters and calculation of Honeycutt indices. We show the enhancement of icosahedral order in the glassy phase. Apart from this, we also use the techniques of community detection to obtain the inherent structures</p><p>in the …
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Monte Carlo approaches to the protein folding problem
… Hydrophobic solutes are found to maintain the orientational order in water, whereas hydrophilic solutes alter it. The gas solubility of n-alkanes in water is unexpected. The solubility shows a minimum as the carbon number is increased at C11. Using Monte Carlo simulations, the solubility of …
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Computational study of self-assembly in block copolymer/superparamagnetic nanoparticle composites under external magnetic fields
… magnetic fields is shown to achieve long range orientational order of the block copolymer nanodomains and is found to be dependent on nanoparticle size, volume fraction and magnetization strength. A critical selectivity of the particles for one nanodomain is observed, above which strong …
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Ordering of Curving Interfaces
… systems. This thesis examines how materials can order on curving interfaces, resulting in shape changes and pattern formation. Many phenomena that are well-studied in flat space display new behavior when lifted onto a deformable surface: liquid crystals buckle membranes into peaked shapes, …
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Binary mixtures of rod-like colloids
… free energy given in terms of a set of orientational order parameter tensors (one for each component of the mixture) and their gradients. In this regard, our theory may be seen as an extension of the Landau-de Gennes theory to mixtures. However, our theory incorporates microscopic …
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Control of Long Range Orientation in Ordered Mesoporous Carbon Thin Films
Ordered mesoporous carbons are appealing for many application areas, where their function and performance depend critically on structure. Thus, alignment of these mesopores by scalable methods is of notable interest. Cooperative self-assembly provides a facile route to fabrication of ordered …
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Synthesis of Nanostructured Organic and Inorganic Materials by Self-Assembly
… of organic and inorganic materials grown in ordered organic matrices. The matrix is a binary system of water and the nonionic surfactant of oligo(ethylene oxide) n&d1; oleyl ether. Initial studies were conducted on mineralization of a calcium phosphate mineral at the interface between ion …
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Lattice modelling of liquid crystal mixtures
… and single set of coupling constants.</p> <p>In order to determine the boundaries between different phase regions in the Canonical Ensemble, the thermal and concentration dependencies of three different observabIes are used. The first observable is the potential energy of the system, the second …
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Pattern Formation in Active Nematics
… organize in large-scale structures with orientational order and self-sustained flows. Examples include suspensions of cytoskeletal filaments and associated motor proteins, monolayers of epithelial cells plated on a substrate, and bacteria swimming in a nematic liquid crystal. In these …
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