This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1063/1.5011196 in citations.
Please use the identifier: http://hdl.handle.net/2128/17698 in citations.
Nano-viscosity of supercooled liquid measured by fluorescence correlation spectroscopy: pressure and temperature dependence and the density scaling
Nano-viscosity of supercooled liquid measured by fluorescence correlation spectroscopy: pressure and temperature dependence and the density scaling
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)...
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Personal Name(s): | Meier, G. (Corresponding author) |
---|---|
Gapinski, J. / Ratajcczyk, M. / Lettinga, M. P. / Hirtz, Kurt / Banachowicz, E. / Patkowski, A. | |
Contributing Institute: |
Weiche Materie; ICS-3 |
Published in: | The journal of chemical physics, 148 (2018) S. 094201 |
Imprint: |
Melville, NY
American Institute of Physics
2018
|
DOI: |
10.1063/1.5011196 |
Document Type: |
Journal Article |
Research Program: |
Functional Macromolecules and Complexes |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/17698 in citations.
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. |