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Showing 1 to 19 of 19 for “"solvent viscosity"”.
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Solvent viscosity and protein dynamics
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-16T16:14:28Z No. of bitstreams: 1 1981_marden.pdf: 2229185 bytes, checksum: e08cab5b997b888be1fc137c39869f7c (MD5)
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The dependence of suspension viscosity on particle size, shear rate, and solvent viscosity
The relative viscosity of a mono-disperse suspension of glass particles can vary drastically depending on a number of factors, including but not limited to the angular velocity, the size of particles, the volume fraction of the suspension, and the solvent viscosity of the host. Several models have …
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THE EMISSION OF PYRIDINE AND POLYPYRIDINECHROMIUM(III) COMPLEXES IN RIGID AND FLUID MEDIA.
… were studied in hydroxylic and nonhydroxylic solvents at 77 K and as a function of temperature. The emission characteristics are determined by the relative disposition of ²E and one component of ²T₁. The energy of these two levels is influenced by intramolecular and environmental factors, and …
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Thermodynamic and kinetic studies of purple membrane from halobacterium halobium
… used flash photolysis to measure the effects of solvent viscosity on the kinetics of the purple membrane photocycle, and we analyzed the data in terms of a modified Kramers' theory. In the second experiment, we determined the purple membrane's apparent density, thermal expansivity, isothermal and …
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Drag Reduction by Polymeric Additive Solutions
… of drag reduced when dealing with higher solvent viscosity to polymer viscosity ratios, but revealed inconsistencies at lower ratios. Additionally, our theoretical and empirical flow rates from the inclined channel were closely aligned. The results of this study highlight the significant …
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Local Motions in Proteins as Investigated by the Thermal Coefficient of the Frictional Resistance to Rotation (Protein Dynamics, Fluorescence, Viscosity)
The thermal coefficient of the viscosity (b) was measured through the fluorescence polarization of tryptophan and tyrosine both free in solution and as intrinsic protein chromophores. For free fluorophores it was found: (1) b is a function of the solvent only and is independent of the probe used in …
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Estudo paramétrico do processo de extração com solvente (VAPEX) como método de recuperação de óleo pesado
… producer and injector, where vaporized solvent is injected with the objective of reducing the oil or bitumen viscosity. The purpose of this study is to examine how some important operational and of reservoir parameters influence the VAPEX process, in the produced oil rates, in the …
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High Pressure Nmr Studies of the Dynamic Structure of Liquids
… isomerization of cyclohexane in solution. The solvents used in this study are methylcyclohexane-d(,14), carbon disulfide and acetone-d(,6). It is found that the activation parameters obtained from the temperature dependence of the rate constant are independent of solvent. However, the …
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Remaining Unperturbed by the Vibrational Response: Probing Vibrational Coupling, Relaxation, and Solvent Effects with 2D IR Spectroscopy
… flow, structural determination, and solute-solvent interactions. A major focus of the research projects covered in this work will be on Intramolecular Vibrational Energy Redistribution (IVR) on two key systems. The first feature aromatic compounds that incorporate a heavy atom (selenium) as …
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Molecular Solvation in Phosphonium Ionic Liquids
… temperature phosphonium ionic liquid (RTPIL) solvent. With virtually no vapor pressure, ILs are attracting attention as potential “green” replacements for conventional volatile organic solvents. ILs are also known for chemical stability, non-flammability and recycling potential. C153 is a …
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Photoconductivity studies of the ferrocyanide ion under high pressure
… light sources could be used. In nonpolar solvents, with an applied d.c. voltage, photo-currents as small as 10 p.a. could be resolved. In aqueous solutions, with an applied voltage oscillating at 1 khz, light-induced conductivity changes as small as 0.01% could be resolved. The …
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Instability and Transition to Turbulence in Complex Viscoelastic Flows Overlying Porous Surfaces
… number (WWWW), permeability parameter (αα), and solvent viscosity ratio (ββ). The analysis reveals a transition from viscoelastic Tollmien--Schlichting (TS)-type modes at low WWWW to a distinct elastic wall mode (EWM) localized near the fluid-porous interfaces at low RRRR. This EWM instability is …
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Modeling and characterization of ionic polymer transducers for sensing and actuation
… considered as a function of the counterion and solvent type present within the ionic polymer. These studies demonstrate the importance of the ionomer's impedance response in understanding the electromechanical capabilites of an ionic polymer transducer. Most sample-to-sample variation can be …
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Motions in myoglobin
… A1 + A3. Each relaxation is non-Arrhenius and solvent viscosity dependent. The rebinding of the A substates was observed after flash photolysis by monitoring the Soret band and the A substates. The low-temperature rebinding (20K-160K) exhibit increasing rebinding rates with increasing …
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The influence of temperature on ion transport in nanofiltration membranes
… of the mobilities of both solute and solvent species, the solute diffusivity and solvent viscosity are well-studied and are used to explain changes in transport through the membrane in most literature. However, NF membranes are defined by several structural and charge-based properties, …
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Thixotropic-viscoelastic rheological fingerprints in large amplitude oscillatory shear
… to thixotropic timescales and the ratio of solvent viscosity to aggregate viscosity). We present an analytical solution for the asymptotic nonlinearities of this model in LAOS, as well as numerical results for the full nonlinearities. We present these results in a manner that eases the …
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In search of catalytic proficiency: The importance of enzyme conformational change to orotidine 5’-monophosphate decarboxylase catalysis
… of the kinetic parameters for various OMPDCs on viscosity (2). This allowed me to determine to what degree chemistry was important to the measured rate because changing viscosity affects the rate of physical steps outside of the active-site while leaving unchanged the chemical steps secluded from …
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Lead - Free Piezoelectric Based Magnetoelectric Composites
… of PVDF layer was adjusted by changing the solvent, viscosity and drying temperature. Different types of electrolyte solutions were investigated to improve the strain and response time. The actuators exhibited high deflection of 90 % with fast response of 50% deflection per second. …
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STRUCTURE-FUNCTION STUDIES OF NOVEL MEDICALLY RELEVANT FLAVOENZYMES
… NADPH binding is governed by electrostatics. Solvent viscosity effects revealed the presence of conformational changes taking place during the catalytic cycle, another property shared with enzymes of the PHBH family that avoid waste of reducing power and release of reactive oxygen species …