The self-diffusion of polymethylsilsesquioxane (PMSSO) dendrimers in diluted solutions and melts

Soft Matter ◽  
2020 ◽  
Vol 16 (42) ◽  
pp. 9712-9725
Author(s):  
Konstantin Boldyrev ◽  
Alexander Chernyak ◽  
Ivan Meshkov ◽  
Aziz Muzafarov ◽  
Elena Tatarinova ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Pfg Nmr

We investigate the temperature dependence of the self-diffusion coefficients of PMSSO dendrimers by PFG NMR in melts and diluted solutions to reveal the effect of the inner structure of these molecules on their translational dynamics.

PFG-NMR Measurements of the Self-Diffusion Coefficients of Water in Equilibrium Poly(HEMA-co-THFMA) Hydrogels

2002 ◽  
Vol 3 (3) ◽  
pp. 554-559 ◽  
Author(s):  
Phuong Y. Ghi ◽  
David J. T. Hill ◽  
Andrew K. Whittaker
Keyword(s):  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Pfg Nmr

scholarly journals Diffusion Coefficients at Infinite Dilution of Carbon Dioxide and Methane in Water, Ethanol, Cyclohexane, Toluene, Methanol, and Acetone: A PFG-NMR and MD Simulation Study

2021 ◽  
Author(s):  
Daniel Bellaire ◽  
Oliver Großmann ◽  
Kerstin Münnemann ◽  
Hans Hasse
Keyword(s):  
Carbon Dioxide ◽  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Infinite Dilution ◽  
The Self ◽  
Resonance Spectroscopy ◽  
Self Diffusion ◽  
P Diffusion ◽  
Dynamics Simulations ◽  
Pfg Nmr

Diffusion coefficients at infinite dilution are important basic data for all processes involving mass transfer. They can be obtained from studying samplesin equilibrium using nuclear magnetic resonance spectroscopy with pulsed field gradients (PFG-NMR), a technique which is widely used in chemistry but isonly rarely applied in engineering studies. This advantageous technique was employed here to measure the self-diffusion coefficients of diluted solutions ofcarbon dioxide and methane in the pure solvents water, ethanol, cyclohexane, toluene, methanol, and acetone at 298.15 K. For the systems (carbon dioxide +water) and (carbon dioxide + ethanol), measurements were also carried out at 308.15 K, 318.15 K and 333.15 K. Except for (methane + water) and (methane +toluene), no literature data for the methane-containing systems were previously available. At the studied solute concentrations, there is practically no differencebetween the self-diffusion coefficient and the mutual diffusion coefficient. The experimental results are compared to experimental literature data as well as toresults from semi-empirical methods for the prediction of diffusion coefficients at infinite dilution. Furthermore, molecular dynamics simulations were carried outfor all systems to determine the diffusion coefficient at infinite dilution based on force fields that were taken from the literature, and the results are compared tothe experimental data and those from the classical prediction methods.

Pressure and Temperature Dependence of Self-Diffusion in Liquid Linear Hydrocarbons

1986 ◽  
Vol 41 (7) ◽  
pp. 963-970 ◽  
Author(s):  
F. Bachl ◽  
H.-D. Lüdemann
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Liquid State ◽  
Activation Parameters ◽  
The Self ◽  
Dynamical Models ◽  
Self Diffusion

The pressure and temperature dependence o f the self-diffusion coefficients D of n-butane, n-pentane, n-hexane, n-decane, trans-2-butene, cis-2-butene and 2-butyne were determined in the liquid state by NM R-techniques at pressure up to 200 MPa and temperatures up to 450 K. The results are taken as tests for the various dynamical models and compared to results obtained by M D calculations. The activation parameters for translational transport and the parameters for the RHS-m odel are derived and discussed.

Self-Diffusion Coefficients in Molten AgNO3-NaNO3 and AgNO3-KNO3 Mixtures

1973 ◽  
Vol 28 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Stefania Zuca ◽  
Mariela Constantinescu
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Arrhenius Equation ◽  
The Self ◽  
Linear Variation ◽  
Self Diffusion ◽  
Capillary Method ◽  
Ionic Size

The self-diffusion coefficients of the constituent cations in the systems (Ag-Na)NO3 and (Ag-K)NO3 have been investigated by the "diffusion-into-the capillary" method at three concentrations (xAgNO3 = 0.25; 0.50; 0.75) and at temperatures ranging from 250 to 400°. A temperature dependence given by the Arrhenius equation and an almost linear variation with composition were observed. The correlation existing between the ionic size of diffusing cations and the diffusion coefficients in these melts is discussed.

scholarly journals Self-Diffusion Coefficients, Aggregation Numbers and the Range of Existence of Spherical Micelles of Oxyethylated Alkylphenols

2021 ◽  
Author(s):  
Victor P. Arkhipov ◽  
Natalia A. Kuzina ◽  
Andrei Filippov
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Aggregation Numbers ◽  
Temperature Ranges ◽  
Spherical Micelles ◽  
Limiting Values

AbstractAggregation numbers were calculated based on measurements of the self-diffusion coefficients, the effective hydrodynamic radii of micelles and aggregates of oxyethylated alkylphenols in aqueous solutions. On the assumption that the radii of spherical micelles are equal to the lengths of fully extended neonol molecules, the limiting values of aggregation numbers corresponding to spherically shaped neonol micelles were calculated. The concentration and temperature ranges under which spherical micelles of neonols are formed were determined.

Concentration dependence of the self-diffusion coefficients of water in electrolyte solutions

1974 ◽  
Vol 14 (6) ◽  
pp. 915-918
Author(s):  
A. M. Sazonov ◽  
V. M. Olevskii ◽  
A. B. Porai-Koshits ◽  
V. N. Skobolev ◽  
G. A. Shmuilovich
Keyword(s):  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
Electrolyte Solutions ◽  
The Self ◽  
Self Diffusion

Silver Self-Diffusion in Al2O3/QE22 Magnesium Alloy Matrix Composite

2009 ◽  
Vol 283-286 ◽  
pp. 155-160
Author(s):  
Ivo Stloukal ◽  
Jiří Čermák
Keyword(s):  
Magnesium Alloy ◽  
Temperature Dependence ◽  
Temperature Interval ◽  
Matrix Composite ◽  
Diffusion Coefficients ◽  
Volume Diffusion ◽  
Effective Diffusion ◽  
Measured Temperature ◽  
Alloy Matrix ◽  
Self Diffusion

Self-diffusion of 110mAg has been investigated in fiber reinforced QE22 magnesium alloy matrix composite. Short Saffil fibers (97% -Al2O3 + 3% SiO2) were used as reinforcement. The diffusion measurements were carried out in the temperature interval 648 – 728 K by serial sectioning method. The volume diffusion coefficients Dv (alloy without reinforcement) and the effective diffusion coefficients Deff (alloy with reinforcement) were obtained by analysis of the penetration curves. The silver diffusion coefficient in the interface boundary matrix/Saffil Di was also estimated. The temperature dependence of volume diffusion coefficients Dv was compared with previous data measured using 65Zn in the same alloy and with literature data for Zn impurity diffusion in Mg single crystal. It was observed, that the temperature dependence of both Deff and Di was significantly non-linear in the measured temperature interval. This behavior supports previous observations with zinc diffusion in the same alloy.

scholarly journals Investigation of the Self-Diffusion Coefficients of Trivalent Gd3+ in aqueous solutions: The Effect of Hydrolysis and nitrate ion association

2012 ◽  
Vol 1 (6) ◽  
pp. 334-346 ◽  
Author(s):  
Rafik Besbes ◽  
Noureddine Ouerfelli ◽  
Manef Abderabba ◽  
Patric Lindqvist-Reis ◽  
Habib Latrous
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Coefficients ◽  
Ion Association ◽  
The Self ◽  
Nitrate Ion ◽  
Self Diffusion
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