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001     820455
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024 7 _ |a 10.1140/epje/i2016-16086-5
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082 _ _ |a 530
100 1 _ |a Eguchi, Kazuya
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245 _ _ |a Thermophoresis of cyclic oligosaccharides in polar solvents
260 _ _ |a Berlin
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520 _ _ |a Cyclodextrins are cyclic oligosaccharides which are interesting as drug delivery systems, because they can be used as containers for pharmaceutical substances. We studied the Ludwig-Soret effect of $\alpha$-, $\beta$-, $\gamma$- and methyl-$\beta$-cyclodextrin in water and formamide by infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS).In water the Soret coefficient, $S_{\mathrm{T}}$, of $\alpha$-, $\beta$- and $\gamma$-cyclodextrin increases with increasing temperature and shows a sign change from negative to positive around $T=35^\circ$C, while $S_{\mathrm{T}}$ of methyl-$\beta$-cyclodextrin is positive in the entire investigated temperature. In formamide $S_{\mathrm{T}}$-values of all cyclodextrins coincide and show a slight decrease with temperature. We discuss the obtained results and relate the $S_{\mathrm{T}}$-values to the different hydrogen bonding capabilities of the cyclodextrins and the used solvents. It turns out that the change of $S_{\mathrm{T}}$ with temperature correlates with the partition coefficient, log~$P$, which indicates that more hydrophilic substances show a more pronounced temperature sensitivity of $S_{\mathrm{T}}$. Additionally we obtained a surprising result measuring the refractive index contrast factor with temperature, $(\partial n/\partial T)_{c,p}$ of cyclodextrins in formamide, which might be explained by a complex formation between cyclodextrins and formamide.
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700 1 _ |a Niether, Doreen
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700 1 _ |a Wiegand, Simone
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700 1 _ |a Kita, Rio
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773 _ _ |a 10.1140/epje/i2016-16086-5
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856 4 _ |y Published on 2016-09-16. Available in OpenAccess from 2017-09-16.
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856 4 _ |y Published on 2016-09-16. Available in OpenAccess from 2017-09-16.
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