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Showing 1 to 20 of 374 for “"Dispersions"”.
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Coalescence of secondary dispersions
… has been made of the coalescence of secondary dispersions in beds of woven meshes. The variables investigated were superficial velocity, bed depth, mesh geometry and fibre material; the effects of presoaking the bed in the dispersed phase before operation were also considered. Equipment was …
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Ultrasound propagation in colloidal dispersions
… of ultrasonic parameters in colloidal dispersions. A brief description of the properties and uses of ultrasound propagation in dispersions is followed by an extensive review of theories which relate the particulate properties of the dispersions to the measurable ultrasonic parameters, …
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Optical properties of concentrated dispersions
… of multiple scattering, concentrated, colloidal dispersions. The variation of R and T with pathlength, wavelength, and concentration has been investigated for non-spherical particles in concentrated dispersions, over a range of pH and surfactant concentrations. Measurements of diffuse …
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Thermorheological properties of nanostructured dispersions
Nanostructured dispersions, which consist of nanometer-sized particles, tubes, sheets, or droplets that are dispersed in liquids, have exhibited substantially higher thermal conductivities over those of the liquids alone. While it is desirable to synthesize a fluid that has improved heat transfer …
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Dissolution Behavior of Amorphous Solid Dispersions
… enhancement techniques, such as amorphous solid dispersions (ASDs), can be used in oral dosage forms to increase the apparent solubility of the drug in the gastrointestinal tract thus increasing the bioavailability of the drug. However, the drug solution generated from the dissolution of an ASD …
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Particulate dispersions for magnetic recording data
The study of a magnetic recording media dispersion has been carried out using hindered settling analysis, the purpose of which was to probe the equilibrium state structure in zero applied magnetic field. The system chosen for the main study was based on a commercial formulation of a y-Fe 203 …
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Structure and Sorption Behaviour of Liposomal Dispersions
Sommige surfactants vormen dubbellagen bij het dispergeren in water. Door mechanische agitatie sluiten deze dubbellagen zich vaak tot liposomen, ook wel vesikels genoemd. In de dubbellagen kunnen zowel amfifiele als hydrofobe stoffen sorberen terwijl hydrofiele stoffen kunnen ingesloten worden in …
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Polymer drug dispersions: understanding structure and dynamics
… of the structure and dynamics of amorphous dispersions using three model drugs. We aimed to develop solid-state NMR methods to provide invaluable information on molecular mobility; to ultimately use NMR for the prediction of crystallisation outcomes from stability studies, leading to quicker …
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Coalescence of secondary dispersions in packed beds
… has been made of the coalescence of secondary dispersions in beds of monosized glass ballotini. The variables investigated were superficial velocity, bed depth, ballotini size and dispersed phase concentration. Equipment was designed to generate a toluene ln water dispersion with phase ratios …
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Coalescence of secondary dispersions in fibrous beds
… has been made of the coalescence of secondary dispersions in a fibrous bed. The literature pertaining to the formation, hydrodynamic behaviour and methods of separation of droplets less than one hundred micrometres in diameter has been reviewed with particular reference to fibrous bed …
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The Rheology of Anionic Aqueous Polyurethane Dispersions
… behavior of anionic aqueous polyurethane dispersions from the dilute to the concentrated regime. At dilute to intermediate concentrations these systems behave as standard electrostatically stabilized particles. However at higher concentrations, standard models for electrostatically …
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Dispersions of barium titanate in organic liquids
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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The Shear and Extensional Rheology of Polymer Dispersions
For the oil and gas extraction process, the understanding of well construction fluids (WCFs) were found to be fundamental towards the success and safety of the operation. This is due to the multiple functions the fluid provides such as maintaining the well bore formation pressure, lubricating the …
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Solid dispersions: formulation, characterisation, permeability and genomic evaluation
… phenylbutazone and succinylsulphathiazole. Solid dispersions were prepared using various drugs to polymer ratios. PEG 8000 was selected as a carrier in the solid dispersions. The study revealed that inclusion of drug within the polymeric matrix, ratio of drug to polymer and physicochemical …
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Mechanisms of secondary dispersions separation in particulate beds
The mechanisms by which drops of secondary liquid dispersion ie. <100μ m, are collected, coalesced and transferred have been studied in particulate beds of different sizes and heights of glass ballotini. The apparatus facilitated different coalescer cell arrangements. The liquid-liquid system was …
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Coalescence mechanisms of dispersions in glass fibre beds
The separation of secondary liquid-liquid dispersions in fibrous glass packing has been investigated. A novel technique was developed to study drops within the packing by matching the refractive indices of the packing, its holder and the continuous and dispersed phases. This rendered the packing …
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On the theory of Brownian aggregation in colloidal dispersions
… kinetics is a topic of interest for colloidal dispersions, macromolecular fluids, nanoparticle self-assembly, and biochemical reactions. The manipulation of colloidal dispersion stability by containing or promoting aggregation rates is manifest in several natural phenomena and engineering …
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Studies of the Coalescence of Dispersions in Particulate Packings
Droplet hydrodynamics and coalescence mechanisms in a packed bed have been studied using a mono-sized primary inlet dispersion with a packing of equal sized glass spheres. Four systems were studied and a correlation was developed using a dimensional analysis to evaluate the parameters affecting the …
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Rheology of concentrated protein solutions and attractive colloidal dispersions
… In general, viscosity of attractive colloidal dispersions increases with their concentration and attraction strength, and diverges at the gel point. In this thesis, we investigate the mechanism of enhanced viscosity of concentrated protein solutions and colloidal dispersions due to …
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