Use of Taylor dispersion for the measurement of probe diffusion in polymer solutions

Wisnudel, Marc B.; Torkelson, John M.

doi:10.1002/aic.690420428

Cited by 12 publications

(32 citation statements)

References 43 publications

(37 reference statements)

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“…31 Thus, the final sample concentration in the tube was in our case in the range of 0.15-0.8 mg/mL. The bias in the measured diffusion coefficient of a polymer sample with a concentration below 1 mg/mL can usually be neglected.…”

Section: Determination Of Diffusion Coefficientsmentioning

confidence: 88%

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Mes¹,

Kok²,

Poppe³

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Section: Determination Of Diffusion Coefficientsmentioning

confidence: 88%

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Mes¹,

Kok²,

Poppe³

et al. 1999

J. Polym. Sci. B Polym. Phys.

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“…Experimental diffusion coefficient data of anthracene in CO 2 are not available in the literature to our knowledge. However, experimental diffusion data are available for both the anthracene ground and triplet states in normal liquids, − and they are plotted in Figure . Anthracene triplet diffusion coefficients do not show any noticeable difference from the ground state values.…”

Section: Discussionmentioning

confidence: 99%

A Steady-State and Time-Resolved Fluorescence Study of Quenching Reactions of Anthracene and 1,2-Benzanthracene by Carbon Tetrabromide and Bromoethane in Supercritical Carbon Dioxide

et al. 1997

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This paper reports on the solvent effect on energy transfer reactions in supercritical CO2. The energy transfer reactions are studied by steady-state and time-resolved fluorescence spectroscopy and the fluorophor/quencher reaction pairs are chosen to vary the reactions from diffusion-controlled to kinetically-controlled. In particular, the fluorescence quenching of anthracene by CBr4, 1,2-benzanthracene by CBr4, and anthracene by C2H5Br in supercritical CO2 at 35 °C has been reported. Experimental rate constants for the first two reaction pairs, anthracene/CBr4 and 1,2-benzanthracene/CBr4, follow the predicted diffusion control limit at all pressures from 77.9 to 160.6 bar, indicating that local solvation does not enhance the reaction rate nor substantially impede the diffusion process in supercritical CO2. The rate constants for the third reaction, the quenching of anthracene by C2H5Br, are several orders of magnitude below the diffusion control limit, indicating that the reaction is kinetically controlled, as it is in liquids. In supercritical CO2 the apparent rate constants (i.e., those based on bulk concentrations of the reactants) for the anthracene/C2H5Br reaction decrease dramatically with increasing pressure. We believe that this apparently large pressure effect on the reaction rate is primarily due to the local composition enhancement of the quencher molecules around the dilute anthracene solute. This analysis is supported by fluorescence spectra and solvatochromic shift data of anthracene in pure CO2 and in mixtures of CO2 with C2H5Br at 35 °C that indicate both local density augmentation and local composition increases around the anthracene.

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“…In reality, the injection loop is a coiled capillary and it is well known that coiling leads to secondary flow effects that enhance radial mixing as compared to straight capillaries. Therefore it can be expected that the dispersion behavior is altered for large volume injections in which, after uptake, the sample is not only contained in the straight needle, but also in the coiled capillary [26,27] .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of band spreading generated by flow-through needle and fixed loop sample injectors

Deridder

Desmet

Broeckhoven

2018

Journal of Chromatography A

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Use of Taylor dispersion for the measurement of probe diffusion in polymer solutions

Cited by 12 publications

References 43 publications

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity

A Steady-State and Time-Resolved Fluorescence Study of Quenching Reactions of Anthracene and 1,2-Benzanthracene by Carbon Tetrabromide and Bromoethane in Supercritical Carbon Dioxide

Numerical investigation of band spreading generated by flow-through needle and fixed loop sample injectors

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