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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 “"phase inversion"”.
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Unexplored Dimensions of Processing Phase Inversion during Polymer Melt Blending
… understand the thermodynamic basis for the phase diagram of multi-component blended polymers, often it is the melt processing methodology adopted that governs the final morphology in the product and, in turn, its material properties. The work presented in this thesis deals with examining the …
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Studies of Phase Inversion and Ambivalence in Liquid-Liquid Systems.
… mixing, and the factors determining which phase is dispersed in batch or continuous systems, and studies of phase inversion have been reviewed. A mathematical model has been developed to predict the limits of phase inversion. The model is based on the collision frequency and coalescence …
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The Dynamics of Phase Separation and Structure Formation in Phase Inversion
Studies of phase inversion are presented, the process by which a cast polymer solution is converted into a porous, polymer gel by either thermal or nonsolvent quenching. In all three of the studies presented in this thesis, in-situ optical techniques have been used to study the dynamics of phase …
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Phase Inversion Dynamics of Polylactic Glycolic Acid Solutions Related to Biopharmaceutical Drug Delivery
… densified with stearic acid and placed in a slow phase-inverting depot formulation. Particle densification can potentially be used with any protein or highly soluble drug agent, unlike other techniques that are protein specific. Taking advantage of the effects of low aqueous affinity and …
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The Role of Phase Inversion in the Drug Release Kinetics of Injectable Polymer Solutions
Phase inversion is a process in which a concentrated polymer solution is converted into a solid gel network with desirable end-use properties. In this thesis, studies of the role nonsolvent induced phase inversion plays in the protein release kinetics of injectable drug delivery devices are …
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Study on the gas performance of ceramic membrane from kaolin prepared by phase inversion technique
… of ceramic membrane from kaolin via simple phase inversion technique. First, ceramic membrane suspension have been prepared by stirring kaolin as raw material, N-methyl-2-pyrollidone (NMP) as solvent and polyethersulfone (PESf) as binder. Phase inversion tchnique conducted by casted the …
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Study on the gas performance of ceramic membrane from kaolin prepared by phase inversion technique
… of ceramic membrane from kaolin via simple phase inversion technique. First, ceramic membrane suspension have been prepared by stirring kaolin as raw material, N-methyl-2-pyrollidone (NMP) as solvent and polyethersulfone (PESf) as binder. Phase inversion tchnique conducted by casted the …
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Measurement and analysis of bath-side interfacial concentration gradients during membrane quenching by phase inversion
… during the quench step of membrane formation by phase inversion. From examination of individual Fourier components in a diffraction pattern associated with this one-dimensional mass transport process one is able to overcome the temporal and spatial resolution limitations imposed by many of the …
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The Phase Inversion-based Coal-CO₂ Slurry (PHICCOS) feeding system : design, coupled multiscale analysis, and technoeconomic assessment
… of a novel coal feeding system. The proposed Phase Inversion-based Coal-CO₂ Slurry (PHICCOS) feeding system uses supercritical CO₂ with liquid-like density to feed pulverized coal into a high-pressure EFG. The challenge of preparing the coal-CO₂ slurry is addressed using phase inversion: a …
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Liquid-Liquid Extraction in Agitated Contactors Involving Droplet Coalescence and Redispersion
… of the rate of energy imparted to the dispersed phase, and whether contact is stagewise or differential. In the high energy contactors a droplet coalescence-redispersion mechanism predominates, The literature pertaining to these extractors has been examined and the important phenomena such as …
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Investigation of mixing in the melting regime during polymer compounding
… two components. the progression to the final two-phase viscoelastic melt involves an intermediate stage where either one or both the components are melting or softening. Our focus is identifying and quantifying the factors that determine morphologies in the melting regime. We identify blend …
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Understanding and optimisation of non-conventional emulsions
… systems will be discussed in terms of phase inversion where it will be shown that inversion of emulsions can be controlled by addition of diol within both systems. For phase inversion in water, diol, paraffin liquid and non-ionic surfactant systems it will be argued that the phase …
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Diffusion kinetics and phase separation phenomena during asymmetric membrane formation
… and experimental analysis of the dynamics of the phase inversion process for forming asymmetric membrane structure have been carried out. A comprehensive model combining the evaporation and quench steps of phase inversion has been developed by using an improved numerical algorithm based on a …
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Design of Viscoelastic Surfactant-oil-water Structures with the Hydrophilic-lipophilic Difference (HLD) and Net-average Curvature (NAC) Frameworks
… and liquid crystals to curvature-related phase inversion phenomena observed in surfactant-oil-water systems. The phase inversion point, in turn, can be predicted with the hydrophilic-lipophilic difference (HLD) framework. This approach was successful at predicting the formation of …
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Liquid-liquid Extraction Studies in a Pilot Scale Agitated Column
… single drop mass transfer, axial mixing and phase inversion/flooding, has been reviewed. A 450 mm diameter, fourteen compartment R.D.C. was designed and operated with the system kerosene-acetone-water over a range of practical rotor speeds. The results were compared with those from a …
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Transport properties of micellar solutions and microemulsions.
… complex nonionic surfactant-water-oil systems. Phase diagrams were determined for the tetraoxyethylene dodecylether (C[12]E[4])-water and the Brij 30-water systems; the available hexaoxyethylene dodecylether (C[12]E[6])-water phase diagram was confirmed.Conductivity measurements were made in the …
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Solubilisation and emulsification of silicone oils in aqueous surfactant systems
… and PDMS molecular weight on the emulsion phase inversion of water/PDMS/surfactant systems has been studied in detail. For certain nonionic surfactants the equilibrium phase behaviour of equal volumes of water and oil has been studied in Winsor systems. At air-water surfaces, the spreading …
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Understanding Structure-Property Relationships for Impact Polystyrene
… understanding of the multi-component, multi-phase impact polystyrene system and would facilitate development of online analysis tools to improve product quality and process control. Diffusing wave spectroscopy measurements and analysis coupled with microfluidic capillary viscometry was …
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Study of the Performance of a Large Mechanically-Agitated Extraction Column
… drop mass transfer mechanisms and flooding/phase-inversion, and related mathematical models have been reviewed. An experimental study was performed of the hydrodynamic and mass transfer characteristics of a 0.45m diameter, 4.3m high Rotating Disc Contactor. The system used was Clairsol-350 …
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An Investigation of Pore Collapse in Asymmetric Polysulfone Membranes
Porous polysulfone membranes prepared by phase inversion can be tailored to suit filtration requirements by the choice of solvent and coagulant. In the current research polysulfone membranes were prepared by inverting a solution in N-methyl pyrrolidinone (NMP) in isopropanol to form uniform sized …
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