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@ARTICLE{Sehnem:848302,
author = {Sehnem, André Luiz and Niether, Doreen and Wiegand, Simone
and Figueiredo Neto, Antônio Martins},
title = {{T}hermodiffusion of {M}onovalent {O}rganic {S}alts in
{W}ater},
journal = {The journal of physical chemistry / B},
volume = {122},
number = {14},
issn = {1520-5207},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2018-03552},
pages = {4093 - 4100},
year = {2018},
abstract = {The ionic Soret effect induced by temperaturegradients is
investigated in organic electrolytes (tetramethylammoniumand
tetrabutylammonium hydroxides) dispersed in waterusing a
holographic grating experiment. We report the influences
oftemperature and salt concentrations on the Soret,
diffusion, andthermal diffusion coefficients. Experimental
results to the thermaldiffusion coefficient are compared
with a theoretical description forthermodiffusion of
Brownian particles in liquids based in thethermal expansion
of the liquid solution. It is observed that theobtained
thermal diffusion coefficients for the organic
electrolytespresent a similar temperature dependence as the
theoretical prediction. Comparing the experimental results
for the organic andcommon inorganic salts it is proposed an
additional physical mechanism as the cause to the different
thermal diffusioncoefficients in both types of salt. We
propose that the temperature dependence of hydration free
energy gives rise to a force termthat also leads to ion
migration in a temperature gradient. We describe the thermal
diffusion results as a competition betweenthermal expansion
and hydration effects. The specific structure each type of
ion cause in water molecules is considered in the heatof
transport theory to describe thermal diffusion of
electrolytes. A qualitative agreement is seen between our
results and theclassical heat of transport theory.},
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},
pubmed = {pmid:29558136},
UT = {WOS:000430641900040},
doi = {10.1021/acs.jpcb.8b01152},
url = {https://juser.fz-juelich.de/record/848302},
}