%0 Journal Article
%A Meier, G.
%A Gapinski, J.
%A Ratajcczyk, M.
%A Lettinga, M. P.
%A Hirtz, Kurt
%A Banachowicz, E.
%A Patkowski, A.
%T Nano-viscosity of supercooled liquid measured by fluorescence correlation spectroscopy: pressure and temperature dependence and the density scaling
%J The journal of chemical physics
%V 148
%@ 0021-9606
%C Melville, NY
%I American Institute of Physics
%M FZJ-2018-01361
%P 094201
%D 2018
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000427030500017
%R 10.1063/1.5011196
%U https://juser.fz-juelich.de/record/843822