Simultaneous determination of thermal and mutual diffusivity of binary mixtures of n-octacosane with carbon monoxide, hydrogen, and water by dynamic light scattering

Andreas Heller, Thomas M. Koller, Michael H. Rausch, Matthieu S H Fleys, A. N René Bos, Gerard P. Van Der Laan, Zoi A. Makrodimitri, Ioannis Economou, Andreas P. Fröba

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

It is demonstrated that thermal and mutual diffusivities of binary mixtures of n-octacosane (n-C28H58) with carbon monoxide (CO), hydrogen (H2), and water (H2O) are simultaneously accessible by dynamic light scattering (DLS). As the light-scattering signals originating from thermal and concentration fluctuations appear in similar time scales, different data evaluation strategies were tested to achieve minimum uncertainties in the resulting transport properties. To test the agreement of the respective theoretical model with the DLS signals in the regression, an improved multifit procedure is introduced. With the selected data evaluation strategy, uncertainties of 4 to 15% and 4 to 30% in the thermal and mutual diffusivities, respectively, could be obtained for the binary mixtures. The mutual diffusivities for the mixtures measured at temperatures ranging from 398 to 523 K and pressures of 5 to 30 bar at saturation conditions are in good agreement with molecular dynamics simulations and data from the literature.

Original languageEnglish
Pages (from-to)3981-3990
Number of pages10
JournalJournal of Physical Chemistry B
Volume118
Issue number14
DOIs
Publication statusPublished - 10 Apr 2014

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Dynamic light scattering
Carbon Monoxide
thermal diffusivity
Binary mixtures
Carbon monoxide
carbon monoxide
binary mixtures
diffusivity
Hydrogen
light scattering
Hot Temperature
Uncertainty
Water
hydrogen
water
evaluation
Molecular Dynamics Simulation
Light scattering
Transport properties
Molecular dynamics

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Simultaneous determination of thermal and mutual diffusivity of binary mixtures of n-octacosane with carbon monoxide, hydrogen, and water by dynamic light scattering. / Heller, Andreas; Koller, Thomas M.; Rausch, Michael H.; Fleys, Matthieu S H; Bos, A. N René; Van Der Laan, Gerard P.; Makrodimitri, Zoi A.; Economou, Ioannis; Fröba, Andreas P.

In: Journal of Physical Chemistry B, Vol. 118, No. 14, 10.04.2014, p. 3981-3990.

Research output: Contribution to journalArticle

Heller, Andreas ; Koller, Thomas M. ; Rausch, Michael H. ; Fleys, Matthieu S H ; Bos, A. N René ; Van Der Laan, Gerard P. ; Makrodimitri, Zoi A. ; Economou, Ioannis ; Fröba, Andreas P. / Simultaneous determination of thermal and mutual diffusivity of binary mixtures of n-octacosane with carbon monoxide, hydrogen, and water by dynamic light scattering. In: Journal of Physical Chemistry B. 2014 ; Vol. 118, No. 14. pp. 3981-3990.
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AU - Rausch, Michael H.

AU - Fleys, Matthieu S H

AU - Bos, A. N René

AU - Van Der Laan, Gerard P.

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AU - Economou, Ioannis

AU - Fröba, Andreas P.

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AB - It is demonstrated that thermal and mutual diffusivities of binary mixtures of n-octacosane (n-C28H58) with carbon monoxide (CO), hydrogen (H2), and water (H2O) are simultaneously accessible by dynamic light scattering (DLS). As the light-scattering signals originating from thermal and concentration fluctuations appear in similar time scales, different data evaluation strategies were tested to achieve minimum uncertainties in the resulting transport properties. To test the agreement of the respective theoretical model with the DLS signals in the regression, an improved multifit procedure is introduced. With the selected data evaluation strategy, uncertainties of 4 to 15% and 4 to 30% in the thermal and mutual diffusivities, respectively, could be obtained for the binary mixtures. The mutual diffusivities for the mixtures measured at temperatures ranging from 398 to 523 K and pressures of 5 to 30 bar at saturation conditions are in good agreement with molecular dynamics simulations and data from the literature.

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