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Showing 1 to 20 of 33 for “"Polymer adsorption"”.
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Lattice Statistics Of Polymer Adsorption
The interaction of branched polymers with an adsorption surface is studied using rigorous and numerical methods. For a polymer network with a fixed topology and consisting of self-avoiding chains, we prove that the reduced free energy is the same as that for self-avoiding walks interacting with a …
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Design of Heterogeneous Surfaces for Polymer Adsorption
The study of adsorption of a globular protein with intrinsic chemical heterogeneity was performed to highlight the role of the nature of adsorbates. On a chemically homogeneous surface, unlike flexible homopolymers, the adsorption kinetics of protein were strongly affected by the chemical …
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Exact Solutions to Lattice Models of Polymer Adsorption
… in determining the physical properties of a polymeric system. A classical method of modeling polymers is with self-avoiding walks, and entropy may be determined by counting the total number of weighted walks. If directed walks are used, recurrences may be formed and solved to study a variety …
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Mechanisms of polymer adsorption in nanoparticle stabilization for poorly water soluble compounds
… mechanisms of nanosuspension stabilization via polymer adsorption on nanoparticle surface were investigated. As the electrokinetic behavior and colloidal stability depend on the surface characteristics, altering the surface adsorbed polymers affords the different surface properties of …
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Surface properties of New York talc as a function of pH, polymer adsorption and electrolyte concentration
… acidic pH. Talc is highly floatable, requiring polymeric depressants to be added to flotation pulps in order to prevent it from entering the concentrate and reducing its grade. Various polymers such as non-ionic guar gums and anionic Carboxymethyl cellulose (CMC) depressants are employed for …
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Novel Shear-Thinning of Aged PDMS/Fumed Silica Admixtures and Properties of Related Silicone Elastomers
… silica nanoparticles [uFSN] with a siloxane polymer, such as PDMS, forms a difficult to process waxy solid admixture that even long periods of high shear mixing will not thin. In the course of the current work it was noted that after a period of storage certain solid admixtures would become …
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pH-Responsive Polymers for Biosurfaces: An Investigation of Solution Properties and Surface Modifying Performance
<p>Gantrez® copolymers are used widely in the personal care industry, but their mechanisms of interaction with dental surfaces are poorly understood. In this study, we determined a number of the solution and polymer properties that control deposition, adsorption and adhesion in Gantrez® polymer …
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The preparation and characterization of thermo-sensitive colored hydrogel film and surfactant-free porous polystyrene three-dimensional network.
Polymer hydrogel films change their properties in response to environmental change. This remarkable phenomenon results in many potential applications of polymer hydrogel films. In this thesis colored thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) hydrogel film was prepared by firstly …
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Microstructural modeling of lithium battery electrodes
… for liquid electrolyte systems. In dissolved polymer systems, polymer adsorption shifted the percolation threshold to 25 volume percent. Ion transport was analyzed using a computer model designed by Doyle and Newman. Microstructural solutions to ameliorate the rate limiting steps were proposed …
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Particle microstructure and polymer dynamics in concentrated polymer solutions
… of nanoparticle dispersions in concentrated polymer solutions are studied with extensive small angle scattering and NMR experiments. Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with …
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In-line treatment of metal contaminated storm water by charred microporous polymers
… processes could easily be altered to include the adsorption of dissolved contaminants such as metals. Two charred microporous polymers, Supelcarb(TM) and Carboxen-1011(TM) were measured for adsorption capacity for Cu(2+) and Ni(2+) removal in both batch and flow through experiments. Results …
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
… 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 vacuum to sublimate and remove the water. Polymer adsorption and rheology were studied to optimize and …
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Arabinoglucuronoxylan and Arabinoxylan Adsorption onto Regenerated Cellulose Films
… attracted increasing interest as renewable biopolymers because of their abundance. Furthermore, the recognition of biomass as a sustainable and renewable source of biofuels has driven research into the assembly and disassembly of polymers within plant cell walls. Cellulose thin films are useful …
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Implementation of Chemical Flooding Module into the General Purpose Adaptive Simulator
… species added to the simulator were tracer, polymer and surfactant. The methodology adopted was to treat each of these species as an aqueous component with special properties calculated in a chemical module. This chemical module takes into account the flux across each grid interface, the …
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Adsorption of Biomacromolecules onto Polysaccharide Surfaces
… cell wall polysaccharides are abundant natural polymers making them potential sources for sustainable and biodegradable materials. Interfacial behavior, including adsorption and enzymatic degradation, of several plant cell wall polysaccharides and their derivatives were studied with a quartz …
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In situ-Untersuchung von organisch/anorganischen Grenzflächen mit spektraler Ellipsometrie
… Arbeit wurden Grenzflächenphänomene zwischen Polymeren und Oberflächen von Festkörpern wie Glas und Metallen in situ (im wesentlichen mit spektraler Ellipsometrie) untersucht. Dabei stand insbesondere die Frage nach einer Segregation von Entformungsmitteln in Polycarbonat an der Grenzfläche …
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Insights into the behaviour of hydrophobically modified ethoxylated urethane polymers in soft and hard colloid formulation
Hydrophobically modified ethoxylated urethane polymers (HEUR) are used as viscosity modifiers in various formulations, e.g. cosmetics, paints. The HEURS show a complex behaviour in solution owing to the interaction between the hydrophobic segments present in the polymer and other formulation …
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Studies of polysaccharide adsorption onto model cellulose surfaces and self-assembled monolayers by surface plasmon resonance spectroscopy
Throughout the study of polymer adsorption at the air/water and solid/water interfaces, surface tension measurements and surface plasmon resonance (SPR) spectroscopy have been identified as key methods for the acquisition of structural and thermodynamic information. These techniques were used to …
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Simulations of subsurface multiphase flow including polymer flooding in oil reservoirs and infiltration in vadose zone
… price, the enhanced oil recovery methods such as polymer flooding to increase oil production from water flooded fields are becoming more attractive. Effective design of these processes is challenging because the polymer chemistry has a strong effect on reaction and fluid rheology, which in turn …
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