Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 121, Issue 48, Pages 10950-10956Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b09770
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Funding
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) by the Erlangen Graduate School in Advanced Optical Technologies (SHOT) within the German Excellence Initiative
- Shell Global Solutions International B.V.
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For the first time, we demonstrate that it is possible to simultaneously analyze microscopic fluctuations at the surface and in the bulk of a binary liquid mixture by dynamic light scattering in macroscopic thermodynamic equilibrium. For a model system containing n-octacosane and ethanol, three individual signals distinguishable in the time-resolved analysis of the scattered light intensity appear on different time scales. One oscillatory signal from surface fluctuations at the vapor liquid interface in the short time range and two exponential Rayleigh signals from fluctuations in temperature and concentration in the bulk of fluid in the long-time range could be associated with hydrodynamic modes. This microscopic information allows for a simultaneous determination of the macroscopic properties interfacial tension, kinematic viscosity, thermal diffusivity, and mutual diffusivity within a single experimental run. The presented approach represents a worthwhile strategy, for example, in the context of sensor development for an effective multiproperty determination of fluid systems.
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