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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 20 of 55 for “"lyotropic"”.
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Thermodynamics of Micellar Lyotropic Liquid Crystals
Aqueous lyotropic liquid crystals (LLCs) comprise a class of ordered morphologies formed by self-assembly of amphiphiles in water. LLCs assume a variety of concentration- and temperature-dependent structures including lamellae (bilayers), bicontinuous networks, hexagonally-packed cylindrical …
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Structural studies of nonionic lyotropic liquid crystals
The nonjonic surfactants n-C 1 6113 3 (OCH2CH2) 60H (C 1 6E06 ) and CiS-C9H18=C 1 3H2 5 (0CH2CH2 ) 60H (C22E06) have been studied in binary mixtures with heavy water, using techniques including optical microscopy, nuclear magnetic resonance and x-ray and neutron scattering. The liquid crystalline …
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Thermotropic and lyotropic mesophases formed by some lithium soaps.
The termotropic polymorphism of anhydrous lithium stearate (n-octadecanoate, LiCi8), lithium oleate (cis-9-octadecenoate) and an unusual semi-crystalline lithium phenylstearate (LiPS) soap mixture composed of 12 positional isomers, was studied using differential scanning calorimetry (DSC) and …
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Direct Templating of Semiconductor Nanostructures With Lyotropic Liquid Crystals
Material growth in lyotropic liquid crystals has proven to be a very powerful methodology for the creation of nanoscopic features in mineral phases. Two distinct methodologies were studied---bulk templating and thin film templating. Bulk templating yields a powder of material containing the …
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Understanding emergence of supramolecular chirality in lyotropic conjugated polymers
… chirality in conjugated polymers within lyotropic liquid crystals (LCs) and its dependence on molecular design and solvent selection. Furthermore, it explores the impact of this chirality on device-relevant properties, such as charge carrier mobility and conductivity upon chemical doping. …
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Light scattering study of highly swollen lyotropic liquid crystal
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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The production of a lyotropic liquid crystal coated powder precursor through twin screw extrusion.
… extrusion technique has been explored to produce lyotropic liquid crystal coated powder precursor by exploiting Pluronic F127 thermoreversible gelation property to get powder precursor without granular aggregates or with less compacted granular aggregates. The highly soluble chlorpheniramine …
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A structural study of lyotropic liquid crystal phases formed by aqueous solutions of fluorinated surfactants
The binary lyotropic liquid crystalline system Caesium Perfluorooctanoate (CsPFO) / heavy water ( 2H20) has previously been reported to exhibit three mesogenic phases. These were, as a function of decreasing temperature at fixed concentration and pressure isotropic, nematic and lamellar. The …
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Extraction of Algal Pigments and Their Encapsulation in Lyotropic Liquid Crystalline Nanoparticles for Anticancer Applications
… presents an approach based on non- lamellar lyotropic liquid crystalline nanoparticles (LLCNPs), specifically cubosomes, as nanocarriers suitable for encapsulation of the extracted algal pigments to improve their solubility, stability, and delivery to pancreatic cancer cells, thus enhancing …
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FABRICATION OF FUNCTIONAL NANOSTRUCTURED POLYMERS BASED ON THERMOTROPIC AND LYOTROPIC LIQUID CRYSTALS DERIVED FROM SUSTAINABLE RESOURCES
… materials can be realized from thermotropic and lyotropic liquid crystals derived from unsaturated fatty acids, and on the properties of the materials thus produced. While prior use of the so-called “molecular templating” approach has produced well-defined nanostructured membranes from …
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Ionene and ionene alkyl sulfate stoichiometric complexes
… i.e. optically isotropic dry complexes underwent lyotropic and thermotropic phase transitions to the optically anisotropic phase (and vice versa) under controlled relative humidity. The optically anisotropic phases exhibited hexagonal textures as revealed by polarizing microscopy. A new feature is …
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Investigation of the physical properties of cholesteryl ester liquid crystal and the interaction with cells
… in cell culture media self-assembles into lyotropic layer. POM and FTIR analysis showed CELC after immersion in media displayed lyotropic smectic phases. The AFM and FESEM images indicated good adhesion of cells on the CELC. This research thus showed that the hydrophilic layers of lyotropic …
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Synand characterisation of silicone based mesophase forming materials.
… cases, X-ray diffraction. An overview of the lyotropic behaviour of the amphiphiles was obtained using the penetration technique. The principles explaining the thermotropic behaviour of conventional amphiphiles appear to be generally applicable to these amphiphilic siloxanes. Thus, the …
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Synthesis, Characterization, and Utilization of Polyol Amphiphile Molecules
… amphiphiles are predictably hygroscopic, forming lyotropic liquid crystals upon exposure to water. The resulting lamellar and hexagonal mesophases were characterized by a variety of techniques including small angle x-ray scattering and polarized optical microscopy. Interestingly, the polyol …
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Templating of Metal Oxide and Oxhydroxides Nanoparticles in Surfactant Media
… these particles were carried out in surfactant lyotropic liquid crystal media and in aqueous glyme solutions. Partial phase diagrams for different commercial surfactantIH20 systems (Neodol (1-5E), Brij 97 and CTAB) have been examined for stability to the iron oxyhydroxide synthesis conditions …
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Proton-coupled carbon-13 sample spinning NMR studies of macromolecules and ordered systems
… of macromolecular systems such as lipid/water lyotropic phases and elastomeric polymers, and in addition a thermotropic liquid-crystal displaying macroscopic orientational ordering behavior, by Carbon-13 ($\sp{13}$C) nuclear magnetic resonance (NMR) spectroscopy. We find that under ""magic …
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Self-Assembly of Azobenzene Photosurfactants and the Relationship with Macroscopic Properties
… of their behaviour under shear, formation of lyotropic liquid crystal phases and use as templating agents. In this work, small-angle scattering is used extensively to probe the shape and dimensions of the self-assembled surfactant aggregates in solution. It will become apparent this is a key …
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Poly(pyridinium salt)s exhibiting liquid-crystalline and light-emitting properties
… The polymers in solution formed a full-grown lyotropic liquid-crystalline phase at concentrations as low as 5 wt % in methanol and 19 wt % in DMSO. The thermotropic liquid-crystalline polymers containing triflimide counterions had much lower melting transitions than those containing tosylate …
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Pressure Driven Desalination Utilizing Nanomaterials
… The designed polymerizable surfactant forms lyotropic liquid crystalline mesophases in an aqueous medium with hexagonal packing of cylindrical micelles. The adsorption of surfactants on the surface of carbon nanotubes allows a stable dispersion of carbon nanotubes encapsulated in the …
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