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@ARTICLE{Poatyska:828165,
author = {Połatyńska, Agnieszka and Tomczyk, Karolina and
Pochylski, Mikołaj and Meier, G. and Gapinski, Jacek and
Banachowicz, Ewa and Śliwa, Tomasz and Patkowski, Adam},
title = {{T}emperature dependent {FCS} studies using a long working
distance objective: {V}iscosities of supercooled liquids and
particle size},
journal = {The journal of chemical physics},
volume = {146},
number = {8},
issn = {1089-7690},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2017-02133},
pages = {084506 -},
year = {2017},
abstract = {In this work, we describe new experimental setups for
Fluorescence Correlation Spectroscopy (FCS) where a long
working distance objective is used. Using these setups, FCS
measurements in a broad temperature range for a small sample
volume of about 50 μlcan be performed. The use of specially
designed cells and a dry long working distance objective was
essential for avoiding temperature gradients in the sample.
The performance of the new setups and a traditional FCS
setup with immersion objectives is compared. The FCS data in
combination with the Stokes-Einstein (SE) relation were used
to obtain the values of the nanoviscosity of a fluid. We
show for selected molecular van der Waals supercooled
liquids that despite the fact that in these systems, a
characteristic length scale can be defined, the
nanoviscosity obtained from FCS is in a very good agreement
with the macroscopic (rheometric) viscosity of the sample in
a broad temperature range. This result corroborates the
applicability of the SE relation to supercooled liquids at
temperatures above 1.2 Tg. We also show that the temperature
dependent size of thermoresponsive microgel particles can be
determined by FCS using the designed cells and a long
working distance objective in a broader size range without a
need to use the correction procedure since the size
correction is proportional to the square of the ratio of the
hydrodynamic radius to the confocal volume size.},
cin = {ICS-3},
ddc = {540},
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:000395901000040},
doi = {10.1063/1.4977047},
url = {https://juser.fz-juelich.de/record/828165},
}