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 135 for “"Polydispersity"”.
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Implications of Nanofiber Length and Polydispersity on Flow Alignment
… This thesis investigates how fibril length and polydispersity influence the bulk rheology and nanoscale 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 …
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The effects of polydispersity on the morphology of polystyrene-polyferrocenyldimethylsilane block copolymer thin films
Introduction: As the size of electronic and magnetic devices decreases, nanoscale patterning becomes an increasingly important area of research. Two different approaches have been taken to pattern media: top-down methods such as lithography, and bottom-up methods such as self-assembly. Top-down …
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Preparation and Characterization Of Oil-in-water Nano-emulsions Of Trifluoperazine For Parenteral Drug Delivery
… the Thin-layer hydration method. Z-average, polydispersity index, zeta potential of emulsions were determined. A fully randomized 2X2X2X2X2 statistical design was developed using JMP software. Optimal formulation was selected based on desirable properties of low z-average and polydispersity …
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Network morphologies in monodisperse and polydisperse multiblock terpolymers.
… were previously identified in “monodisperse” (polydispersity index (PDI) < ~1.1 in all blocks) poly(isoprene-bstyrene- b-ethylene oxide) (ISO) triblock terpolymers. This work extends the investigation of multiply continuous network structures to two other classes of multiblock terpolymers: i) …
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Studies in the anionic polymerization of methyl methacrylate
… solubility but produced polymer with lower polydispersity and higher syndiotacticity than in toluene alone. Experiments using toluene/THF mixtures yielded no polymer, thought to be owing to a side reaction between THF and aluminium triisobutyl. Increased solvent polarity, achieved using …
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Synthesis and characterisation of vinyl block copolymers
… conclusive evidence of a living system and the polydispersity indices were between 1.5 and 3. However, using relatively apolar solvents, in the presence of aluminium alkyls, homopolymerisation of methyl methacrylate showed characteristics of a living polymerisation. An investigation of the …
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Part I: Effect of Nanomicelle Size on Trans-scleral Permeability of Dexamethasone and Part II: Strategies to Minimize Octreotide Acylation during Sustained Release from Biodegradable Polymers
… permeation chromatography (molecular weights and polydispersity), critical micelle concentration (CMC) and in vitro cytotoxicity studies in corneal, conjunctival and retinal cell-lines. Newly synthesized polymers were purified and characterized for their structure and molecular weights by H¹-NMR …
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Modeling the Nucleation and Growth of Colloidal Nanoparticles
… colloidal nanoparticles with desired sizes and polydispersity. This dissertation focuses on identifying the possible roles of ligands and size on the kinetics of nanoparticle formation and growth using in-situ characterization tools such as small-angle X-ray scattering (SAXS) and kinetic …
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Synthesis and characterization of polymacromonomers based on polyethers
… of different character and molar masses with polydispersity indices from 1,4 -3,0 were obtained. The ATRP carried out in water using PEO macroinitiator led to polymacromonomers with polydispersity indices from 1,1 to 1,3 and desiried molecular weight. In all cases the conversion of …
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Structure formation and fractionation in systems of colloidal rods
… and research applications, a rather small polydispersity is desired in order to have well defined material properties. The polydispersity can be reduced by a spatial demixing (fractionation) of long and short rods. Fractionation and structure formation is studied in a tridisperse and a …
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Development and Characterization of Fluocinolone Acetonide Loaded Nanosized Lipid Carriers for Ocular Delivery via Subconjunctival Route: Synergistic Effect of Vitamin a Palmitate
… for physicochemical characteristics (size, polydispersity index and charge), release and stability studies. Further, in situ gel of FA-NLC was developed using gellan gum and hydroxypropyl methylcellulose as gelling agents. In situ gels were characterized for rheological behavior, in vitro …
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New Insights into the Mitigation of Asphaltene Deposition and the Utilization of Asphaltene Deposits
… to investigate the effect of asphaltenes polydispersity and aromaticity on their deposition tendency. We have compared asphaltene deposition for two model oils with the same total amount of asphaltenes but different asphaltene polydispersity distribution using a high pressure – high …
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Design and optimization of colloidal quantum dot solids for enhanced charge transport and photovoltaics
… mobility. In particular, we have focused on the polydispersity in CQDs, which normally lies in the range of 5-15%. The effect of size-dispersion in CQD solids on the charge carrier mobility was computed using charge hopping transport models. The experimental film deposition processes were …
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Mesoscale simulation of block copolymer phase separation and directed self-assembly processes: Applications for semiconductor manufacturing
… increase in line roughness when χN was low. Polydispersity resulted in a moderate increase in line roughness. In regards to equilibrium defect density, free energy calculations showed that χ was the primary determining factor, not χN as many expected. Equilibrium defect density was found to …
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Oscillating Dispersed-Phase Co-Flow Microfluidic Droplet Generation: Effects on Jet Length and Droplet Size
… technique is bottlenecked with droplet polydispersity at high throughputs due to the transition from a more-stable dripping regime to an instable jetting regime at high d-phase flow rates. We applied nozzle oscillatory motion to generate an axial shear gradient as well as inducing an …
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Study of two-way coupled particle laden turbulent flow over a backward-facing step using large-eddy simulation
… to examine the effects of inertia, coupling, and polydispersity on the statistics of carrier and dispersed phases.
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Clear, Aqueous Topical Nanomicelle Formulation For Diabetic Macula Edema
… rehydration method, characterized with size, polydispersity, shape, morphology, clarity/ appearance and cytotoxicity on human corneal and retinal cell lines. A specific blend of HCO and Oc-40 at a particular wt% ratio which produced highest desirability generated by JMP software. The optimized …
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A Transferrin conjugated nanoemulsion system for brain delivery of antiretroviral therapy
… into Tf-NE as an antiretroviral agent. Size, polydispersity index, and dispersion stability were characterized using dynamic light scattering (DLS) system. Morphology of the Tf-NE was investigated using transmission electron microscopy (TEM). Differential scanning calorimetry was performed to …
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