Molecular Diffusion Coefficients of Organic Compounds in Water at Different Temperatures

Delgado, J. M. P. Q.

doi:10.1007/s11669-007-9160-4

Cited by 61 publications

(27 citation statements)

References 12 publications

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“…The overall mean diffusion coefficient and standard deviation obtained from Table 1 27,28 It can thus be concluded that the values measured in the two experiments are consistent and that the different times at which the pictures were taken did not significantly affect the calculated diffusion coefficient. Using a 2r D variation, the results also indicate that the diffusion coefficient can be estimated with a minimum accuracy of about 10%.…”

Section: Calculation Of the Diffusion Coefficientsupporting

confidence: 52%

Dissolution kinetics or pure mass transfer? A mechanistic study of dissolution

2010

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In many cases, classic in vitro tests are used to investigate dissolution from powders and solids. A problem with these kinds of tests is the frequent use of agitation, leading to a lumped description of the properties at the solid-liquid interface. The hydrodynamic forces arising from agitation might have a nontrivial impact on the dissolution properties, thus calling for a comparison of results with those stemming from stagnant dissolution with the aim to increase the understanding of the dissolution process. Stagnant dissolution of compressed solid benzoic acid was examined using the noninvasive electronic speckle pattern interferometry technique in this study. The diffusion coefficient for benzoic acid in 37 C water was measured using the same technique, and, by combining the results, the surface kinetics at the solid-liquid interface were calculated. A comparison with previous dissolution data from a rotating disk suggests that the presence of convection can increase the observed surface kinetics.

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Section: Calculation Of the Diffusion Coefficientsupporting

confidence: 52%

Dissolution kinetics or pure mass transfer? A mechanistic study of dissolution

2010

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“…To illustrate the range of DBLs achievable by the rotating‐disk reactor, we report, in Fig. , the theoretical DBL thicknesses for O 2 (

D_{O_{2}}

= 1.33 × 10 −9 m 2 s −1 ; Han and Bartels ),

{CO}_{3}^{2 -}

(

D_{{CO}_{3}^{2 -}}

= 5.21 × 10 −10 m 2 s −1 ; Zeebe ), and benzoic acid (C 7 H 6 O 2 ,

D_{C_{7} H_{6} O_{2}}

= 6.7 × 10 −10 m 2 s −1 ; Delgado ) as a function of the rotating speed of the disk ( ω ), for a temperature of 10°C in freshwater ( ν = 1.31 × 10 −6 m 2 s −1 ).…”

Section: Materials and Proceduresmentioning

confidence: 99%

Controlling the diffusive boundary layer thickness above the sediment–water interface in a thermostated rotating‐disk reactor

Sulpis

Mucci

Boudreau³

et al. 2019

Limnology & Ocean Methods

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The diffusive boundary layer (DBL) is a thin layer of fluid at the interface with a solid surface in which frictional forces cause molecular diffusion to become the dominant mode of solute transport. The thickness of the DBL is a function of the nature and roughness of sediment substrates, as well as the bottom‐current speed. In low‐energy natural aquatic environments, such as abyssal plains or lakes, the thickness of the DBL can reach several millimeters and significantly impede the diffusive rate of solutes through the sediment–water interface (SWI). Thus, precisely reproducing the DBL in the laboratory is required to simulate benthic diffusive fluxes similar to those encountered in situ. Yet, an experimental apparatus allowing precise control of the DBL thickness at the SWI in the laboratory has not been described in the literature. Here, we present a simple temperature‐controlled rotating‐disk system, which is suitable for the use with natural sediments and that is capable of generating thick DBLs. Water overlying the rotating sediment can be sampled discretely or continuously to monitor the chemical reaction progress. We tested the validity of the reactor by dissolving a foraminiferal sand bed in natural seawater. We find that (1) measured dissolution fluxes agree with those predicted by theory and (2) the dissolution of calcite in these seafloor‐like hydrodynamic conditions is controlled by mass transfer across the DBL above the bed. Guidelines for best practices under various experimental conditions, possible future developments, and the theoretical equations to compute the DBL thickness and diffusive fluxes in this reactor are described.

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“…6 and the values presented in Ref. [34]. Figure 6 compares the experimental diffusion coefficients in water as obtained in this work with those in Eq.…”

Section: Resultsmentioning

confidence: 51%

“…[34] at different temperatures. The amount of experimental diffusion coefficients showed good agreement with diffusion coefficients reported in [32,34]. Figure 7 reveals that the diffusion coefficient of benzoic acid in γ-Al 2 O 3 -water nanofluids was increased by temperature.…”

Section: Resultsmentioning

confidence: 99%