Density scaling and decoupling in o-terphenyl, salol, and dibutyphthalate
Abstract
We present new viscosity and equation of state (EoS) results extending to high pressures for o-terphenyl, salol, and dibutylphthalate. Using these and data from the literature, we show that the three liquids all conform to density scaling; that is, their reduced viscosities and reorientational relaxation times are a function of the ratio of temperature and density with the latter raised to a constant. Moreover, the functional form of the dependence on this ratio is independent of the experimental probe of the dynamics. This means that there is no decoupling of the viscosities and relaxation times over the measured range of conditions. Previous literature at odds with these results was based on erroneous extrapolations of the EoS or problematic diamond anvil viscosity data. Thus, there are no exceptions to the experimental fact that every non-associated liquid complies with density scaling with an invariant scaling exponent.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 08, 2016
- Source ID
- 10.1063/1.4960513
Entities
People
- C. Michael Roland
- R. Casalini
- S. S. Bair
Organizations
- Georgia Tech
- Natural Sciences and Engineering Research Council
- Office of Naval Research
- United States Naval Research Laboratory