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@ARTICLE{Lee:907908,
author = {Lee, Namkyu and Mohanakumar, Shilpa and Wiegand, Simone},
title = {{T}hermophoretic microfluidic cells for evaluating {S}oret
coefficient of colloidal particles},
journal = {International journal of heat and mass transfer},
volume = {194},
issn = {0017-9310},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2022-02277},
pages = {123002 -},
year = {2022},
abstract = {Thermodiffusion or thermophoresis gained much interest in
bio, chemical, and energy engineering. Al- though there are
several methods to measure thermophoresis, they consume
large sample volumes, are limited to binary mixtures, and
give only indirect access to the applied temperature
profile. Herein, we propose a thermophoretic microfluidic
cell for quantitative measurements of the Soret coefficient
of col- loids. The actual microscale measuring channel lies
between cooling and heating channels to achieve a
one-dimensional temperature gradient. Fluorescence lifetime
imaging microscopy with Rhodamine B is utilized to measure
the spatial temperature profile in the channel. The
fluorescence intensity of fluo- rescently labeled
polystyrene particles with a diameter of 25 nm is used to
monitor the concentration profile. The observed temperature
and concentration profiles are one-dimensional, as gradients
in the longitudinal and height directions can be neglected.
In the investigated temperature range, the averaged
difference between the measured Soret coefficients with the
cell and determined with the Thermal Dif- fusion Forced
Rayleigh Scattering set-up is less than $8\%.$},
cin = {IBI-4},
ddc = {620},
cid = {I:(DE-Juel1)IBI-4-20200312},
pnm = {5241 - Molecular Information Processing in Cellular Systems
(POF4-524)},
pid = {G:(DE-HGF)POF4-5241},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000806815900002},
doi = {10.1016/j.ijheatmasstransfer.2022.123002},
url = {https://juser.fz-juelich.de/record/907908},
}