Study of the Soret Effect in Monosaccharide Solutions

Blanco, P.; Wiegand, S.

doi:10.1021/jp910331a

Journal Article

PreJuSER-9900

Study of the Soret Effect in Monosaccharide Solutions

Blanco, P.FZJ* ; Wiegand, S.FZJ*

2010
Soc. Washington, DC

The journal of physical chemistry <Washington, DC> / B 114, 2807 - 2813 (2010) [10.1021/jp910331a]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4670 doi:10.1021/jp910331a

Abstract: We investigated the thermal diffusion behavior of aqueous solutions of monosaccharides with the infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS) setup. As monosaccharides, we studied the three aldohexoses glucose, galactose, and mannose and the two ketohexoses sorbose and fructose. All sugars have the same molecular weight, but their structures differ as well as some physical properties such as viscosity, density, thermal expansion coefficient, and optical rotation. Additionally, we measured the viscosity and the optical rotation of the monosaccharide solutions in the investigated temperature and concentration range. While there is a clear correlation between the structure and the thermal diffusion behavior for alkanes, the situation is much more complicated for the monosaccharides. Nevertheless, as in the case of the alkanes, we find a correlation between the thermal diffusion coefficient with the ratio of the thermal expansion coefficient and the kinematic viscosity. We discuss the physical principles, which connect the thermal diffusion behavior with other thermophysical properties and the structure of the different sugars.

Keyword(s): Diffusion (MeSH) ; Molecular Structure (MeSH) ; Monosaccharides: chemistry (MeSH) ; Solutions: chemistry (MeSH) ; Spectroscopy, Fourier Transform Infrared (MeSH) ; Stereoisomerism (MeSH) ; Temperature (MeSH) ; Viscosity (MeSH) ; Monosaccharides ; Solutions ; J

Classification:

Chemistry, Physical

Note: We appreciate many fruitful discussions with Pavel Polyakov, Malte Kleemeier, and Gerd Meier. We thank Stefanie Jacob and Martina Bischop for their help with polarimeter measurements. We are also grateful for very helpful remarks by Stefan Immel. We thank the Department of Education, Universities and Investigation of Basque Government for the grant BFI08188.0. Financial support due to the Deutsche Forschungsgemeinschaft grant Wi 1684 is gratefully acknowledged.

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