TY  - JOUR
AU  - Meier, G.
AU  - Gapinski, J.
AU  - Ratajcczyk, M.
AU  - Lettinga, M. P.
AU  - Hirtz, Kurt
AU  - Banachowicz, E.
AU  - Patkowski, A.
TI  - Nano-viscosity of supercooled liquid measured by fluorescence correlation spectroscopy: pressure and temperature dependence and the density scaling
JO  - The journal of chemical physics
VL  - 148
SN  - 0021-9606
CY  - Melville, NY
PB  - American Institute of Physics
M1  - FZJ-2018-01361
SP  - 094201
PY  - 2018
AB  - The Stokes-Einstein relation allows us to calculate apparent viscosity experienced by tracers in complex media on the basis of measured self-diffusion coefficients. Such defined nano-viscosity values can be obtained through single particle techniques, like fluorescence correlation spectroscopy (FCS) and particle tracking (PT). In order to perform such measurements, as functions of pressure and temperature, a new sample cell was designed and is described in this work. We show that this cell in combination with a long working distance objective of the confocal microscope can be used for successful FCS, PT, and confocal imaging experiments in broad pressure (0.1-100 MPa) and temperature ranges. The temperature and pressure dependent nano-viscosity of a van der Waals liquid obtained from the translational diffusion coefficient measured in this cell by means of FCS obeys the same scaling as the rotational relaxation and macro-viscosity of the system.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000427030500017
DO  - DOI:10.1063/1.5011196
UR  - https://juser.fz-juelich.de/record/843822
ER  -