Dynamic and structural properties of oxyethylated isononylphenols

© 2016Diffusion coefficients, dielectric relaxation times and refraction coefficients were measured, and activation energies of translational and rotational mobilities were determined for a series of oxyethylated phenols (neonols AF9-n) p-C9H19C6H4-O(CH2CH2O)nH, n = 4, 6, 8, 9, 10, 12, at different temperatures. The results demonstrated the existence of contraction and transition phenomena that changed the structure of neonol molecules at n ∼ 9 from a zigzag to a meander form

Specifics of the physicochemical properties of tetramethylurea

The rotational and translational mobility of tetramethylurea molecules over the temperature range 15-60°C was studied using the NMR relaxation and proton spin-echo methods. The activation energies for these motions were calculated. The density, viscosity, isothermal compressibility, and cubic expansivity were determined. A thermogravimetric analysis of the substance was performed. The physicochemical properties of tetramethylurea were compared to those of urea, its other methyl-substituted derivatives, and dimethylformamide. Copyright © 2005 by Pleiades Publishing, Inc

Micelles and aggregates of oxyethylated isononylphenols and their extraction properties near cloud point

We used nuclear magnetic resonance (NMR) spectroscopy and dynamic light scattering (DLS) techniques to study the structural and dynamic properties of micellar solutions of nonionic surfactants of a homologous series of oxyethylated isononylphenols - C9H19C6H 4O(C2H4O)nH, where n = 6, 8, 9, 10, or 12 - in a wide range of temperatures, including cloud points. The radii of the micelles and aggregates, as well as their compositions at different concentrations of surfactant, were determined. Using aqueous phenol solutions as a model, we studied the process of cloud point extraction with oxyethylated isononylphenols. © 2014 American Chemical Society

Molecular self-diffusion and micellar structure in the aqueous solutions of AF9-10 ethoxylated isononylphenol near a cloud point

© 2014 Mendeleev Communications. All rights reserved. Sizes of micelles and compositions of aggregates in the aqueous solutions of the nonionic surfactant oxyethylated monoalkyl phenol (neonol AF9-10) were determined by NMR spectroscopy, NMR diffusometry and dynamic light scattering in a wide range of tem- peratures near the cloud point. The cloud point extraction of phenol from aqueous solutions by the surfactant AF9-10 was performed

Manipulating Biopolymer Dynamics by Anisotropic Nanoconfinement

How the geometry of nano-sized confinement affects dynamics of biomaterials is interesting yet poorly understood. An elucidation of structural details upon nano-sized confinement may benefit manufacturing pharmaceuticals in biomaterial sciences and medicine. The behavior of biopolymers in nano-sized confinement is investigated using coarse-grained models and molecular simulations. Particularly, we address the effects of shapes of a confinement on protein folding dynamics by measuring folding rates and dissecting structural properties of the transition states in nano-sized spheres and ellipsoids. We find that when the form of a confinement resembles the geometrical properties of the transition states, the rates of folding kinetics are most enhanced. This knowledge of shape selectivity in identifying optimal conditions for reactions will have a broad impact in nanotechnology and pharmaceutical sciences.Comment: to appear in Nano Letter

High-resolution NMR spectrometer tesla BS-587A controlled by an IBM/PC compatible personal computer

Modification of a commercial computer-controlled high-resolution NMR spectrometer Tesla BS-587A and specially designed interface circuits are described, which allow the original ADT-4700 computer to be replaced by a modern IBM PC compatible personal computer. © 1998 MAHK Hayka/Interperiodica Publishing

High-resolution NMR spectrometer tesla BS-587A controlled by an IBM/PC compatible personal computer

Modification of a commercial computer-controlled high-resolution NMR spectrometer Tesla BS-587A and specially designed interface circuits are described, which allow the original ADT-4700 computer to be replaced by a modern IBM PC compatible personal computer. © 1998 MAHK Hayka/Interperiodica Publishing

High-resolution NMR spectrometer tesla BS-587A controlled by an IBM/PC compatible personal computer

Modification of a commercial computer-controlled high-resolution NMR spectrometer Tesla BS-587A and specially designed interface circuits are described, which allow the original ADT-4700 computer to be replaced by a modern IBM PC compatible personal computer. © 1998 MAHK Hayka/Interperiodica Publishing

Dynamic and structural properties, cloud point of mixed micelles of oxyethylated isononylphenols

© 2019, © 2019 Taylor & Francis Group, LLC. We measured the self-diffusion coefficients of mixed micelles formed in binary mixtures of oxyethylated isononylphenols (neonols) AF9-2,3,4,6,8,9,10,12 by NMR diffusometry in aqueous 1 wt% solutions. The effective hydrodynamic radii of the micelles were calculated using the Stokes-Einstein relation. Cloud points of these solutions were determined visually and the relation between the cloud point and the composition of the mixture was suggested. Extraction of phenol from the solutions at their cloud points was also studied