scholarly journals Quaternary Diffusion Coefficients in a Protein−Polymer−Salt−Water System Determined by Rayleigh Interferometry

2009 ◽  
Vol 113 (40) ◽  
pp. 13446-13453 ◽  
Author(s):  
Onofrio Annunziata ◽  
Alessandro Vergara ◽  
Luigi Paduano ◽  
Roberto Sartorio ◽  
Donald G. Miller ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Salt Water ◽  
Water System ◽  
Protein Polymer ◽  
Rayleigh Interferometry

Regeneration and Reuse of Salt-tolerant Zwitterionic Polymer Fluids by Simple Salt/water System

2022 ◽  
pp. 128203
Author(s):  
Yinuo Li ◽  
Tingting Wei ◽  
Long Chen ◽  
Kaixiang Wang ◽  
Yulin Shi
Keyword(s):  
Salt Water ◽  
Water System ◽  
Salt Tolerant ◽  
Polymer Fluids ◽  
Zwitterionic Polymer

scholarly journals Phase Equilibrium and Interdiffusion in Poly(Vinyl Methyl Ether)-Water System

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2445 ◽  
Author(s):  
Uliana V. Nikulova ◽  
Anatoly E. Chalykh
Keyword(s):  
Phase Equilibrium ◽  
Methyl Ether ◽  
Diffusion Coefficients ◽  
Water System ◽  
State Diagram ◽  
Pair Interaction ◽  
Dilute Solution ◽  
Vinyl Methyl ◽  
Vinyl Methyl Ether ◽  
Kinetics Of

The phase state diagram of the poly(vinyl methyl ether)-water system in a wide concentration range was obtained by the optical interferometry method. It was shown that this system was characterized by a complicated phase equilibrium with two lower critical solution temperatures, one of which was located in the concentrated region at 21 °C, and the other one in the region of a dilute solution at 31 °C. In the framework of the Flory–Huggins theory, pair interaction parameters were calculated for different parts of the binodal curves, and an attempt was made to reverse simulate the diagram in different conditions. It was suggested that the unusual character of the diagram was associated with the formation of a complicated complex between PVME and water in the middle region of the compositions. Concentration profiles for different temperatures were constructed. For the first time for this system, the numerical values of the diffusion coefficients of poly(vinyl methyl ether) (PVME) into water and water in PVME were obtained. Concentration and temperature dependences of diffusion coefficients were constructed and analyzed. The kinetics of water sorption in PVME was plotted, the clustering integral was calculated, and the approximate number of molecules in a water cluster was estimated. It was shown that in the dilute solution region upon passing through the binodal curve, the interphase disappeared immediately, and the remaining fluctuation of the concentration decreased in size with time. The kinetics of this process was estimated from the change in the size of such a particle.

Vapor–liquid and chemical equilibria model for formaldehyde + 1,3,5-trioxane + methanol + salt + water system

2020 ◽  
Vol 507 ◽  
pp. 112434
Author(s):  
Xianming Zhang ◽  
Yufeng Hu ◽  
Weiting Ma ◽  
Jianguang Qi ◽  
Shuqin Mo
Keyword(s):  
Salt Water ◽  
Water System ◽  
Chemical Equilibria ◽  
Vapor Liquid

Microstructural study of cetyltrimethylammonium bromide / 1-butanol / salt / water system — SANS and 2D-NOESY analysis

2012 ◽  
Vol 90 (3) ◽  
pp. 314-320 ◽  
Author(s):  
K. Kuperkar ◽  
A. Patriati ◽  
E.G.R. Putra ◽  
K. Singh ◽  
D.G. Marangoni ◽  
...  
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Nuclear Overhauser Effect ◽  
Salt Water ◽  
Total Concentration ◽  
Water System ◽  
2D Nmr ◽  
Spectral Shift ◽  
Micellar Aggregates ◽  
2D Noesy ◽  
Nuclear Overhauser

Interaction of 1-butanol (BuOH) with a cationic surfactant, cetyltrimethylammonium bromide (CTAB) aggregate, in water and salt solution has been studied by viscometry, small-angle neutron scattering (SANS), and 2D-NMR techniques. The experimental results are interpreted in terms of a possible micellar growth occurring in the presence of added alcohol and salt. It was observed that the addition of BuOH strongly influences the viscosity of the CTAB/salt micellar system, reaching a peak viscosity at about 0.5% w/v of BuOH over a range of salt concentrations. Scattering measurements support the idea of a structural transformation by the observation of a spectral shift (broadening) as the total concentration of surfactant varies, indicating a decrease in the intermicellar distance and narrow size distribution. The chemical shift from 1H NMR measurements gave complementary data on the solubilization of BuOH in CTAB micelles, whereas the expected locus (site) of the additive added to the surfactant including the dynamics of the molecules in micellar aggregates were successfully correlated by significant and positive cross peaks obtained from two-dimensional nuclear Overhauser effect spectroscopy (2D-NOESY).

Thermodynamics Phase Equilibria for the Salt - Water System of Potassium and Rubidium Ions

2014 ◽  
Vol 88 (s1) ◽  
pp. 393-394
Author(s):  
Xudong YU ◽  
Ying ZENG ◽  
Qinghong YIN ◽  
Yun PENG
Keyword(s):  
Phase Equilibria ◽  
Salt Water ◽  
Water System
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