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Showing 1 to 20 of 26 for “"Colloidal Dispersions"”.
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Ultrasound propagation in colloidal dispersions
… them to measurements 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 …
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On the theory of Brownian aggregation in colloidal dispersions
… aggregation 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 …
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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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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
Within a colloidal dispersion, the presence of negatively adsorbing material can produce a variety of effects on the dispersion properties and interactions. With increasing concentration, the negatively adsorbing material induces both depletion and structural forces on the dispersion, which can …
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Critical heat flux enhancement via surface modification using colloidal dispersions of nanoparticles (Nanofluids)
Nanofluids are engineered colloidal dispersions of nanoparticles (1-100nm) in common fluids (water, refrigerants, or ethanol...). Materials used for nanoparticles include chemically stable metals (e.g., gold, silver, copper), metal oxides (e.g., alumina, zirconia, silica, titania) and carbon in …
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Self-assembly and dynamics of colloidal dispersions in steady and time-varying external fields
… of functional materials can be fabricated using dispersions of colloids and nanoparticles. If the dispersion is responsive to an external field, like dielectric and charged particles in an electric field or paramagnetic particles in a magnetic field, the field can be used to facilitate …
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Dynamic simulations of colloidal dispersions: sticky and polarizable particles as building blocks for novel materials
… of custamizability is soft materials composed of colloidal particles. These dispersions can be fabricated to respond to a variety of stimuli, including external fields. There have been decades of work using both experiments and theory to investigate the microstructure and material properties of …
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Surface Charge Regulation Effects on Fluidic Nanoscale Systems
… conductivities, reduced stability of doped colloidal dispersions, and a dependence of the surface charge on the solvent structure.
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STUDY OF COLLOIDAL INTERACTIONS MEDIATED BY BIOMOLECULAR RECOGNITION AND BY ELECTROKINETIC FLOWS.
… on new types of interparticle interactions in colloidal dispersions. In particular, it considers interactions mediated by two different phenomena - biomolecular recognition and electrokinetic flows. The general purpose of this investigation is twofold: while we investigate new mechanisms …
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Controlled synthesis and characterization of templated, magneto-responsive nanoparticle structures
Magnetic fluids are colloidal dispersions of magnetic nanoparticles that are stable with respect to gravitational and moderate magnetic fields because of their small particle size, and to unbounded aggregation due to their surface coatings. The interaction between individual magnetic nanoparticles …
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An experimental study of the magnetic linear birefringence and dichroism of liquids, solutions and dispersions
… fields In molecular liquids, solutions and colloidal dispersions. The measurements were made using apparatus of greater sensitivity than any previously described; most results were new determinations. The liquids were mostly linear and branched alkanes, or alkane derivatives, generally being …
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Opto-Electronic Modulation of Quantum Dots by Cells and Bioactive Molecules
… QDs, spectroscopic analysis of optically excited colloidal QDs with HL60, K562, and T98G cell lines are performed. Our results show statistically significant (p < 0.001 and p < 0.0001) quenching of the emission spectra of the colloidal dispersions due to bioactive molecules in common …
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Experimental study of alumina-water and zirconia-water nanofluids convective heat transfer and viscous pressure loss in Laminar regime
… and zirconia-water nanofluids. Nanofluids are colloidal dispersions of nanoparticles in metal, metal oxide, carbon-based materials in base fluids, and may offer improved heat transfer properties compared with pure base fluids. A flow loop with a vertical heated section was designed and …
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An experimental investigation of diffuse optical scattering from stationary and flowing dispersions
… of diffuse optical scattering from concentrated colloidal dispersions. Novel measurement techniques using optical fibres are investigated. These are applied to monodisperse spherical latexes where the results are compared with theories of radiative transport, and also to plate-like Kaolinite …
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Study of chemistry and irradiation effects on nanofluids to be used in light water reactor accident cooling
Nanofluids, colloidal dispersions of nanoparticles in a base fluid, have shown enhancements in both pool boiling and flow boiling critical heat flux (CHF) in laboratory tests. The applicability of this aspect to nuclear reactor post-accident cooling is promising. This study investigates various …
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Optical properties of concentrated dispersions
… R 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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Effects of surface parameters on boiling heat transfer phenomena
Nanofluids, engineered colloidal dispersions of nanoparticles in fluid, have been shown to enhance pool and flow boiling CHF. The CHF enhancement was due to nanoparticle deposited on the heater surface, which was verified in pool boiling. However, no such work has been done for flow boiling. Using …
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Preparation, type and stability of emulsions stabilised by solid particles
… role in such systems.The stability of aqueous colloidal dispersions in the presence of various electrolytes and over a range of pH is shown to be important in determining the stability of toluene-in-water emulsions formed from them. Partial flocculation of the silica dispersions enhances the …
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Novel methods for fabrication of non-close-packed structures through colloidal self-assembly
Colloidal dispersions are usually stabilized by interparticle electrostatic repulsion. However, strong electrostatic potentials prevent nucleation of new structures. When the electrostatic potential is strongly attractive, particles coagulate into a disordered structure; if it is strongly …
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Modulation of Dendritic Cells with the Interleukin-10 Gene on Polycation-Modified Polymeric Particles
… of these particles revealed stable colloidal dispersions (diameters: 297.2±14nm in PLGAO10H6-pIL-10 and 126.0±8nm in PSO10H6-pIL-10). DNA molecules carried by PSO10H6 and PLGAO10H6 were protected from serum digestion. Results from in vitro gene transfection studies showed two-fold …
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