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Showing 1 to 12 of 12 for “"colloidal system"”.
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Polymerization in Confined Space
… of acrylamide in confined space was studied. The system used for the polymerization was a colloid of water/SDS/dodecane/pentanol. The colloidal was stable through the polymerization process only at specific compositions. The system revealed a lamellar water structure which housed the gamma …
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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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Rheology of polyelectrolyte multilayer modified suspension
… and scientific significance. A wealth of new colloidal systems emerged from the need of soft materials with well-defined, and adjustable, rheological properties. Prominent examples are multiarm star polymers, microgels, thermosensitive colloids, and depletion gels. These systems are tailored …
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Diffusiophoresis in complex and confined fluids
… of surface/volume ratio as the length of the systems decreases the efficiency of the latter. The use of thermodynamic forces such as electric fields, chemical potential and temperature gradients is crucial for effective transport when the local perturbation of the fluid at the interfaces …
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Controlling Colloidal Stability using Highly Charged Nanoparticles
… components of the project centered on a model colloidal system containing silica microparticles at the isoelectric point where the suspensions are unstable and prone to flocculation. The stability of the silica suspensions was studied in the presence of highly charged nanoparticles. Initial …
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Modeling rough energy landscapes in defected condensed matter
… with partial amorphization to a semi-crystalline colloidal system. First, we investigate the interactions of hydrogen with point defect clusters (PDC) in Fe-C alloys via a combination of density functional theory and a statistical mechanics model. We cast our PDC concentration results in a novel …
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The Colloidal Glass Transition Under Confinement
… accepted theoretical description. Here, we use colloidal particles as hard-sphere models and experimentally study particle dynamics of colloidal suspensions under different confinements near the glass transition. In three dimension (3D), we design a colloidal system, where particles are confined …
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Interacting Stochastic Processes: from Viciousness to Caging to Force Chains
… As for the first example, we generalize a system of vicious random walkers in which the only interaction between any two random walkers is that when they intersect, both walkers are annihilated. We define a system of N vicious accelerating walkers with each walker undergoing random …
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Soft Self-assembly and Densest Packings in Colloidal Models
… and useful structures have been obtain by colloidal self-assembly, including triangular, kagome and square lattices in two- dimensional systems and hexagonal layered structures and color-tunable structures in three-dimensional systems. However, the self-assembly process itself has not yet …
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Structure, rheology and applications of thermally-gelling nanoemulsions
Colloidal gelation is an effective tool to engineer material properties. Nanoemulsions, liquid-liquid dispersions where the droplet size is on the order of 100 nm, have become an emerging model system for studying aspects of colloidal gel materials. In conventional approaches, the gelation of …
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Studies on the Adsorption of Surfactants and Polymers to Surfaces and Their Effects on Colloidal Forces
… describes measurements of the forces acting on colloidal particles in surfactant and polymer solutions. The change in force on addition of surfactants and polymers is usually caused by adsorption to an interface. In this thesis, I also describe the effect of surface charge density, surface …
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Experimental (spectroscopic) and theoretical studies of rhodanine (2-Thio-4-Oxothiazolidine) and its derivatives
… behaviour with citrate-reduced Ag and Au colloidal (substrate) nanoparticles, as well as for semi-quantitative trace analysis. The pH studies revealed that the optimum conditions for SERS analysis is the presence of HC1 and poly(L-lysine) at pH 2.3 (?o = 632.8 nm). The SERS studies also …