Temperature dependence of thermal diffusion for aqueous solutions of monosaccarides, oligosaccharides, and polysaccharides

Kishikawa, Y.; Wiegand, S.; Maeda, K.; Kita, R.; Shinohara, H.; Nakamura, Y.

doi:10.1039/c2cp41183k

Journal Article

Temperature dependence of thermal diffusion for aqueous solutions of monosaccarides, oligosaccharides, and polysaccharides

Kishikawa, Y. ; Shinohara, H. ; Maeda, K. ; Nakamura, Y. ; Wiegand, S.FZJ* ; Kita, R.

2012
RSC Publ. Cambridge

Physical Chemistry Chemical Physics 14, 10147 - 10153 (2012) [10.1039/c2cp41183k]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4625 doi:10.1039/C2CP41183K

Abstract: We studied the thermal diffusion behavior for binary aqueous solutions of glucose, maltotriose, maltohexaose, pullulan, and dextran by means of thermal diffusion forced Rayleigh scattering (TDFRS). The investigated saccharides with molar masses between 0.180 and 440 kg mol(-1) were studied in the temperature range between 15 and 55 °C. The thermal diffusion coefficient D(T) and the Soret coefficient S(T) of all solutions increase with increasing temperature. For maltohexaose and the polymers the thermal diffusion coefficient changes sign from negative to positive with increasing temperature, whereas glucose and maltotriose show only positive values in the entire investigated temperature range. While we were able to find a master curve to describe the temperature dependence of D(T), we were not able to find a similar expression for S(T). This comprehensive study allows for the first time the determination of the interaction parameters for the polymer and the solvent within the theoretical framework suggested by Würger [Phys. Rev. Lett., 2009, 102, 078302].

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Note: The authors are indebted to Jan Dhont for his kind help and to Gerhard Meier for correction reading. The technical support of Hartmut Kriegs is appreciated. The sample donation by Hayashibara co. is acknowledged. This work is partially supported by Deutsche Forschungsgemeinschaft (grant Wi 1684) and by the Ministry of Education, Science, Sports and Culture, Japan (Grant-in-Aid for Scientific Research).

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