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@ARTICLE{Eguchi:820455,
author = {Eguchi, Kazuya and Niether, Doreen and Wiegand, Simone and
Kita, Rio},
title = {{T}hermophoresis of cyclic oligosaccharides in polar
solvents},
journal = {The European physical journal / E},
volume = {39},
number = {9},
issn = {1292-895X},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2016-05765},
pages = {86},
year = {2016},
abstract = {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.},
cin = {ICS-3},
ddc = {530},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551)},
pid = {G:(DE-HGF)POF3-551},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000384580700001},
doi = {10.1140/epje/i2016-16086-5},
url = {https://juser.fz-juelich.de/record/820455},
}