Density, conductance, transference numbers, and diffusion measurements in concentrated solutions of nickel chloride at 25�C

1979 ◽  
Vol 8 (7) ◽  
pp. 489-500 ◽  
Author(s):  
Robin H. Stokes ◽  
Sonny Phang ◽  
Reginald Mills
Keyword(s):  
Nickel Chloride ◽  
Transference Numbers ◽  
Concentrated Solutions ◽  
And Diffusion

Pulsed and Steady Field Gradient NMR Diffusion Measurements in Polymers

1985 ◽  
Vol 58 (3) ◽  
pp. 527-560 ◽  
Author(s):  
Ernst D. von Meerwall
Keyword(s):  
Spin Echo ◽  
Concentrated Solutions ◽  
Free Volume Theory ◽  
Polymer Systems ◽  
Polymer Molecules ◽  
Self Diffusion ◽  
Semidilute Solutions ◽  
Nmr Diffusion ◽  
Nmr Methods ◽  
And Diffusion

Abstract Some twenty years after the development of the steady and pulsed gradient spin-echo NMR methods of measuring self-diffusion, these techniques are now maturing and experiencing a surge of interest, much of it concentrated on polymer systems. The methods are briefly reviewed here, together with the most important results in polymers, with particular concentration on work described within the last few years. The research is divisible into three categories: diffusion of diluent and penetrant molecules in rubbery high polymers, diffusion of polymer molecules in dilute and semidilute solutions with liquid solvents, and diffusion of macromolecules dissolved in concentrated solutions or melts of equivalent or different polymers of arbitrary molecular weight. The review includes the main theoretical interpretations of the experiments, particularly the free-volume theory in its various forms and power-law behaviors postulated by recent refinements of tube/reptation and scaling theory. This article represents an updated elaboration of an earlier review.

Viscosity and Transference Number Measurements of Concentrated Nickel Chloride Solutions at 298.15 K

1979 ◽  
Vol 32 (5) ◽  
pp. 1149 ◽  
Author(s):  
S Phang
Keyword(s):  
Stokes Equation ◽  
Transference Number ◽  
Nickel Chloride ◽  
Transference Numbers ◽  
Nickel Ion ◽  
Chloride Solutions

The viscosity and transference numbers of the nickel ion constituent in nickel chloride solutions are reported between about 0.1 and 4.3 mol dm-3. The e.m.f. method was used to measure the transference number. The latter was compared with values from other methods. The viscosity results were used to test the Wishaw-Stokes equation.

Transference numbers and conductance in concentrated copper(II) chloride solutions at 25°C

1983 ◽  
Vol 36 (10) ◽  
pp. 1913 ◽  
Author(s):  
RN Ellis ◽  
RH Stokes ◽  
AC Wright ◽  
M Spiro
Keyword(s):  
Moving Boundary ◽  
Transference Numbers ◽  
Major Constituent ◽  
Concentrated Solutions ◽  
Chloro Complexes ◽  
Chloride Solutions ◽  
Density Measurements ◽  
Boundary Method

Transference numbers in concentrated copper(II) chloride solutions at 25°C are obtained by (i) a modified moving boundary method using other solutions to isolate both electrodes from the CuCl2 solution, and (ii) the e.m.f. method using cells with transference with gaseous chlorine electrodes. Conductance and density measurements are also reported. The transference results support the more recent Russian work against the earlier measurements of Denham; there is no evidence of negative cation constituent transference numbers, and it is concluded that anionic chloro complexes are not a major constituent of the concentrated solutions. In this respect copper(II) chloride differs from the halides of cadmium and zinc.

TRANSFERENCE NUMBERS AND CONDUCTANCES IN CONCENTRATED SOLUTIONS: SILVER NITRATE AND SILVER PERCHLORATE AT 25.00 °C

1959 ◽  
Vol 37 (12) ◽  
pp. 1959-1963 ◽  
Author(s):  
A. N. Campbell ◽  
K. P. Singh
Keyword(s):  
Aqueous Solutions ◽  
Silver Nitrate ◽  
Transference Number ◽  
Transference Numbers ◽  
Concentrated Solutions ◽  
Equivalent Conductance ◽  
Ion Formation ◽  
Silver Perchlorate ◽  
Complex Ion

The transference numbers, equivalent conductances, densities, and viscosities of aqueous solutions of silver nitrate and of silver perchlorate have been determined from a concentration of 0.1 M up to 7.6 M, for silver nitrate, and up to 5.6 M for silver perchlorate. In both cases the cation transference number increases considerably with increasing concentration. Certain anomalies in the results for silver perchlorate raise the possibility of complex ion formation here. Similar anomalies appear in the behavior of equivalent conductance with respect to concentration.The results of the conductance measurements have been compared with the values calculated from the equations of Wishaw and Stokes and of Falkenhagen and Leist.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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