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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 21 for “"polarized optical microscopy"”.
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Synthesis, Characterization, and Utilization of Polyol Amphiphile Molecules
… including small angle x-ray scattering and polarized optical microscopy. Interestingly, the polyol amphiphiles also formed anisotropic phases in the neat state, although of lower order than hydrated phases. In addition, the aqueous mesophases have been utilized in the synthesis of …
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Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.
… 1 to 5 weight percent in the PET matrix. DSC and polarized optical microscopy were used to determine the crystallization effects of MLS addition. Non isothermal crystallization kinetics showed that the melting temperature and crystallization temperature decrease as the MLS percent increases. This …
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Polyamide-imide and Montmorillonite Nanocomposites
… was then cured by step-wise heat treatment. Polarized optical microscopy was used to choose the best suitable MMT for PAI matrix and to study the distribution of MMT in PAI matrix. Concentration dependent dispersion effect was studied by x-ray diffraction (XRD) and was confirmed by …
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Understanding the role of kinetic parameters on the crystallization of miscible semicrystalline polymer blends
… with PVF₂ or P(VF₂- TFE)(95-5) were measured by polarized optical microscopy as a function of blend composition and isothermal crystallization temperature, Tx, between 160°C and 215.5°C. The PPVL weight fraction in the blends ranged from 100 to 10 wt%. Using the Lauritzen-Hoffman kinetic theory …
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Synthesis of Perylenediimide-Functionalized Silsesquioxane Nanostructures
… as side chains. The optically active PDI-dimethyl nanoribbons were then formed upon hydrolysis with the certain concentration of ammonium hydroxide as a base. These nanoribbons were characterized using transmission electron microscopy (TEM), elemental analysis, and …
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Bulk and Interfacial Effects on Density in Polymer Nanocomposites
… of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Variation in bulk density via crystallization was analyzed using differential scanning calorimetry (DSC) and polarized optical microscopy. Interfacial densification was investigated using …
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Influence of High Aspect Ratio Nanoparticle Filler Addition on Piezoelectric Nanocomposites
… diffraction, differential scanning calorimetry, polarized optical microscopy, and atomic force microscopy to determine the mechanism behind the increased power harvesting capabilities. As well, explanations for perceived output power from “self-poled” films are briefly explored.</p>
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Determining the role of charges in ionic polymer blend systems
… via differential scanning calorimetry (DSC), polarized optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) …
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Heating it up: a novel approach to annealing soluble organic semiconductors
… the thermal anneal process, focussing heavily on polarized optical microscopy as a characterisation method. There was also some study into photo-enhanced conductivity with the TES-ADT.
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Multi-Scale Assembly Methodologies of Poly(3-Hexylthiophene) Derivative Systems for Enhanced Optoelectronic Anisotropy
… spectroscopy, small-angle X-ray scattering, polarized optical microscopy, and four- point probe conductivity measurements. In dilute solutions, both systems are found to undergo self-assembly when exposed to various stimuli, including temperature, solvent composition, and side-chain …
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Studies on photochromic and potentially mesogenic mercury(II) dithizonates
… series of compounds isolated was investigated by polarized optical microscopy and differential scanning calorimetry. The organomercury(II) acetates displayed a limited, poorly-defined mesomorphism and the type of any mesophase formed remains unidentified. The 4-n-alkoxy-4'-bromobiphenyls (alkoxy = …
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Investigating the molecular origin of polymorphism and transition pathways in organic semiconductors with bulky side chains
… of two different organic semiconductors. In situ microscopy, single-crystal X-ray diffraction, Raman and nuclear magnetic resonance spectroscopy, and molecular simulations combined indicate that the rotating bulky side chains trigger cooperative transition. Cooperativity enables shape memory …
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DESIGN, SYNTHESIS, AND CHARACTERIZATION OF INDANE 2,5-DIKETOPIPERAZINES FOR LIQUID CRYSTAL APPLICATIONS
… DKPs by differential scanning calorimetry and polarized optical microscopy show that they are not liquid crystalline as expected. However, in the process of making the DKPs, conformationally constrained tyrosine analogues, (R)- and (S)-5-hydroxy-2-aminoindan- 2-carboxylic acids, were prepared …
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Implications of Nanofiber Length and Polydispersity on Flow Alignment
… alignment of PNFs under shear using rheology, polarized optical microscopy (POM), and a novel approach to measure 3D orientation distributions in flowing suspensions with small-angle neutron scattering (SANS). Hen egg-white lysozyme (HEWL) PNFs with controlled aspect ratios and polydispersities …
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Batch foaming of hot melt extruded excipient/disintegrant/API pharmaceutical formulations and the study of the effects of the resulting cellular structures on API dissolution
… of this system carried out by Hot-stage Polarized Optical Microscopy (HPOM), Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD) shows that in all HME-prepared samples the API is in amorphous form in the polymer excipients, strongly suggesting that the extrudates are solid …
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Liquid crystalline multi-block copolymers
… The morphology of these polymers was studied by polarized optical microscopy, and wide angle X-ray scattering. Low weight fraction poly(arylate) co- and terpolymers were determined to be amorphous, while higher poly(arylate) weight fraction polymers (15 weight percent or greater) were found to be …
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Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides
… of the material was studied using hot stage polarized optical microscopy (OM) and atomic force microscopy. The spherulitic growth rates were determined as a function of crystallization temperature after quenching from various melt times and temperatures. The effect of crystallization …
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Hot-melt mixing of partially miscible active pharmaceutical ingredient-polymer mixtures
… characterization technique, hot-stage microscopy and differential scanning calorimetry (DSC). The results from the three methods were consistent and the solubility was found to increase from 14% at 80 C to 41% at 140 C. A "phase diagram" was constructed based on the experimental data …
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Crystallization of active pharmaceutical ingredients using microfluidic platforms and meniscus-guided coating
… polymer substrate and characterized by polarized optical microscopy to determine the film morphology and X-ray diffraction (powder and grazing incidence) to determine the molecular packing. Process parameters such as concentration of drug in solution and shearing speed were varied …
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Structure, Dynamics and Association of Thermosensitive Core-Shell Particles
… by a combination of direct observation, polarized optical microscopy and rheology. The effective volume fraction of the particles as derived from their hydrodynamic radius provides the base for all further analysis. After addition of salt all dispersions crystallize at volume fractions …
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