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Showing 1 to 20 of 38 for “"Colloidal Suspension"”.
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Nanoparticle Engineering of Colloidal Suspension Behavior
… the phase behavior, structure, and assembly of colloidal microsphere suspensions. Specifically, by selectively tuning the electrostatic interactions between silica microspheres and polystyrene nanoparticles, we study the behavior of four key systems: (i) strongly repulsive, (ii) haloing, (iii) …
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Drying of colloidal suspension drops : pattern formation and mechanical deformation
The drying of drops of colloidal suspensions on a hydrophilic substrate leads to the formation of a close-packed solid particle deposit. The initial volume fraction of particles sets the shape and size of this deposit, from a ring at the edge of the drop to a solid film covering the initial wetted …
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The rheology and dynamic properties of biopolymers in a colloidal suspension
… Biopolymers, such as xanthan gum, provide good suspension and stability to solutions and exhibit excellent resistance against high shear and high temperature environments. To further expand the application of these biopolymers, there is a need to understand their rheological properties and the …
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Investigation of the effects of colloidal suspension properties on spatially resolved diffuse reflectance
Many quality attributes of pharmaceutical suspensions are directly influenced by the physical properties of constituting particles. The influence has not been explored fully as the chemical characteristics (composition/concentration) are of primary concern. Particle size distribution provides with …
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EXPERIMENTAL AND MODELING STUDIES OF COLLOIDAL SUSPENSION STABILITY OF HIGH-DENSITY PARTICLES IN AQUEOUS SOLUTIONS
Agglomeration and sedimentation of suspended colloidal particles occur in many natural phenomena, in consumer products, and in engineering applications. Stabilized colloidal pigment dispersions were used in ancient Egypt and in ancient France thousands of years ago. Present day applications include …
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Slow dynamics in supercooled liquids : matrix formalism, mode coupling and glass transition
… these two correlation functions in a hard-sphere colloidal suspension improve as the order of the MC closure increases. New glass-transition phenomena are revealed by applying the standard MC closure to a two-Yukawa colloidal suspension.
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NMR spectroscopy in the presence of ultrasound and other perturbations
… The basis of their work is the proposal that a colloidal suspension of solid particles can be made to move like large molecules by using ultrasonic agitation. The advantage of the technique is that the particles move incoherently removing all of the nuclear interactions responsible for broad …
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Direct-write assembly of colloidal materials
Colloidal assembly, which is the spontaneous organization of nano- and micro- sized particles, is an attractive means to create materials with properties that can be engineered via hierarchy of particle composition, size, ordering, and macroscopic form. However, while there are well-established …
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Pressure filtration of destabilized colloidal systems in an unstirred batch cell: Experimental investigation
… model for the filtration of a destabilized colloidal suspension was proposed by Cohen (3). It was shown mathematically that the cake permeability was a function of flocculation rate $\omega$. Thus by controlling the flocculation rate it is possible to alter the structure of the cake formed …
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Experimental evaluation of heat transfer characteristics of silica nanofluid
… showed that the silica nanofluid was a stable colloidal suspension under the temperature range expected in the heated flow loop up to 80°C. Experiments were performed in the flow loop for the silica nanofluid at 0.2 Vol.%, 1 Vol.%, and 5 Vol.% concentrations. It was found that the heat transfer …
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Subcooled flow boiling heat transfer and critical heat flux in water-based nanofluids at low pressure
A nanofluid is a colloidal suspension of nano-scale particles in water, or other base fluids. Previous pool boiling studies have shown that nanofluids can improve the critical heat flux (CHF) by as much as 200%. In this study, subcooled flow boiling heat transfer and CHF experiments were performed …
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
Freeze casting is a colloidal processing technique that shows great promise for development of nanostructured materials. A ceramic nanopowder is dispersed with a polymer in water, under carefully controlled pH. The suspension is cast into a suitable mold and frozen, then de-molded and exposed to a …
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CHARACTERIZATION OF NON-EQUILIBRIUMFLUCTUATIONS DURING FREE-DIFFUSION INHIGHLY-STRATIFIED SOLUTIONS OF GLYCEROL ANDWATER
… structures that appear in a thermophilic suspension of nanoparticles heated from below. Such a system presents a complex stability diagram, determined by the competition between the stabilizing flow of nanoparticles induced by thermophoresis and the destabilizing flow determined by thermal …
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Precombustion desulfurization of coal by photochemical methods and pyrite depression in froth flotation
… Illinois No. 2 coal was obtained. Zinc oxide, in colloidal suspension, produced a small increase in the overall desulfurization at longer reaction times when compared to direct photolysis. The major limiting factor in organic sulfur removal from coal appears to be accessibility rather than …
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Aligned Continuous Cylindrical Pores Derived from Electrospun Polymer Fibers in Titanium Diboride
… PS fibers as a sacrificial filler into a colloidal suspension of TiB2 allows for easy control over the pore size, porosity, and long range ordering of the porous structures of the sintered ceramic. Green bodies were formed by vacuum infiltrating an electrospun-fiber-filled mold with the …
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Material Interactions with Molten LiCl-Li2O-Li
… observation is indicative of a nanofluid-type colloidal suspension of Li8 in a molten LiCl salt matrix. The presence of Li clusters in molten solutions of LiCl-Li has significant implications in that a well-defined solubility limit may not exist due to the dispersion mechanism of colloidal …
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Protein-mediated nanocrystal assembly for floating gate flash memory fabrication
… a new method for NC deposition wherein a colloidal suspension of commercially-available NCs was organized using a self-assembled chaperonin array. The chaperonin array was applied as a scaffold to mediate NCs into an assembly with uniform spatial distribution on Si wafers. By using this …
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Evaporation-Driven Assembly as a Route to Photonic Materials
… to the art of preparing photonic crystals by colloidal self-assembly at an evaporating solvent-air interface, a promising approach for preparing thin films of photonic material over large areas at low cost, if some defects are permissible. The simplest possible example of evaporation-driven …
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Laser Doppler velocimetry measurements of particle velocity fluctuations in a concentrated suspension
Recent statistical constitutive models of suspensions of neutrally buoyant, non-Brownian, non-colloidal, solid spheres in Newtonian fluids suggest that the particles nijgrate in response to gradients in "suspension temperature," defined as the average kinetic energy contained in the particle …
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