The diffusion of monocarboxylic acids in aqueous solution at 25°

Dunn, LA; Stokes, RH

doi:10.1071/ch9650285

Cited by 32 publications

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“…Diffusion coefficient of formic acid in water, D [28] 1.41 × 10 −9 m 2 /s Thiele modulus, = S2 of photocatalytic powders the ratio of the superficial area to the catalyst mass is constant, so the conversion betweenR and the rate of reaction per unit of superficial area is straightforward. (4) Only one kinetic constant (k ) appears in the kinetic equation.…”

Section: Kinetic Equationmentioning

confidence: 99%

A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems

et al. 2016

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Section: Kinetic Equationmentioning

confidence: 99%

A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems

et al. 2016

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“…However, the effect of dimerisation of urea on the mutual diffusion coefficient has not been taken into account. Aspects of the general problem of the effect of solute association o n mutual diffusion coefficients have been discussed by several authors (25)(26)(27)(28). In particular, Schonert (28) has extended Stokes' analysis (24) of tracer diffusion in urea solutions to mutual diffusion, and concluded, in effect, that the experimental diffusion coefficients can be accounted for using a relative viscosity exponent (a in eq.…”

Section: Urea Solutionsmentioning

confidence: 99%

Tracer diffusion in aqueous sucrose and urea solutions

Easteal¹

1990

Can. J. Chem.

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ALLAN J. EASTEAL. Can. J. Chem. 68, 161 1 (1990). Tracer diffusion coefficients for water (as HTO), methanol ( I 4 C H 3 0~) , and acetonitrile (CT,CN) in aqueous sucrose (10-25% w/w) and urea (0.25-4 mol L -I ) solutions at 298 K have been determined using the diaphragm cell technique. For sucrose solutions tracer diffusion coefficients vary with the 213 power of the relative viscosity and the viscosity dependence is the same for the above tracers as for sucrose and oxygen. In urea solutions tracer diffusion coefficients appear to have a solute-specific viscosity dependence, but the solute specificity is largely removed when the effects of proton exchange and urea dimerisation are considered.

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“…Equations [15], [17], [18], [20], and [21] have been simplified by dropping subscripts "1 1" from L and D and subscript "1" from C, U , and p. In addition, the solute has been assumed to be ideal in the thermodynamic sense.…”

Section: Binary Mixturesmentioning

confidence: 99%

“…Einstein's equation (23) (15,(17)(18)(19). If this information is unavailable, values of Di can be estimated from diffusivities for species with similar molecular structures (25).…”

Section: Dik Coeficientsmentioning

confidence: 99%

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Diffusion in associating nonelectrolyte mixtures: stepwise aggregation and micelle formation

Leaist¹

1988

Can. J. Chem.

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Equations have been developed to predict diffusion coefficients and Onsager coefficients for associating nonelectrolyte solutes in binary or multicomponent solutions with any number of association equilibria. The equations are used to interpret previously reported data for binary diffusion with stepwise association of ethanol and N-methylacetamide in carbon tetrachloride solutions. Diffusion of Triton X-100, a non-ionic micelle-forming surfactant, is also analyzed. In contrast to the gradual decrease in the diffusivity caused by stepwise association, formation of micellar aggregates produces a sharp drop in the diffusivity at the critical micelle concentration. The relation between interdiffusion coefficients and intradiffusion coefficients for associating nonelectrolyte solutes is discussed. DEREK G. LEAIST. Can. J. Chem. 66, 1129 (1988). On a dtveloppt des tquations qui permettent de prtdire les coefficients de diffusion et les coefficients dlOnsager de solutts non-tlectrolytes qui s'associent dans des solutions binaires ou B plusieurs composants et qui comportent n'importe quel nombre d'kquilibres d'association. On a utilist les tquations pour interprtter des donnkes rapporttes anttrieurement pour de la diffusion binaire impliquant une association par ttapes de l'tthanol et du N-mtthylacttamide dans des solutions de tttrachlorure de carbone. On a aussi analyst la diffusion du Triton X-100, un agent de surface non-ionique qui forme des micelles. Par opposition avec la diminution graduelle de la possibilitt de diffusion provoqute par cette association par ttapes, la formation d'aggrkgats micellaires provoque une diminution importante de la possibilitk de diffusion B la concentration micellaire critique. On discute de la relation entre les coefficients d'interdiffusion et les coefficients d'intradiffusion pour les solutks non-tlectrolytes qui s'associent.[Traduit par la revue] Introduction Many nonelectrolyte solutes associate (1). Aqueous urea, for example, is extensively dimerized (2,3). In nonpolar solvents, carboxylic acids and phenols form dimers (4-7). Other solutes, such as nucleic acids (8), amides (9-1 l), and certain dyes (12), associate in a stepwise manner to form chain-like aggregates. Non-ionic surfactants illustrate an extreme case of association in which micellar clusters containing several hundred molecules can form (13-16).The work reported here was undertaken to study the diffusion behavior of associating nonelectrolytes. The effects of association on diffusion are interpreted by determining changes in the solute mobility and the free energy gradient, the driving force for diffusion.Binary diffusion of dimerizing solutes (2,(17)(18)(19)(20) and ternary diffusion of solutes A and B that form complex AB (21) have already been studied. The equations developed in the present paper extend the earlier treatments to nonelectrolyte mixtures that contain arbitrary numbers of components and association equilibria.Weinheimer et al. (15) have reported an approximate expression for estimating the diffusion...

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The diffusion of monocarboxylic acids in aqueous solution at 25°

Cited by 32 publications

References 0 publications

A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems

A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems

Tracer diffusion in aqueous sucrose and urea solutions

Diffusion in associating nonelectrolyte mixtures: stepwise aggregation and micelle formation

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