Ph.D. studies at the Silesian University
in Katowice, Poland - 1995 to 1999
This is a short summary of the studies of the dielectric permittivity in binary
mixtures of limited miscibility as a function of temperature and pressure:
The aim of my work was to study the anomaly of dielectric permittivity in
binary mixtures as a function of temperature and pressure. It turned out
that pressure causes that the dielectric permittivity anomaly is bigger
than the one obtained as a function of temperature. This fact allowed to
determine the value of critical exponent fi = 1 - alpha = 0.88 with an error
± 0.03. In the pressure studies the lack of Maxwell-Wagner effect was also
noticed even for a frequency of 100 Hz what proves that the mixtures were
of a high purity. It has been also noticed that the critical amplitude in
the pressure studies is about 40 times bigger than the critical amplitude
in the temperature studies under atmospheric pressure. Big anomaly of the
binodale diameter expressed by dielectric permittivity and the value of the
dTC/dE2 coefficient were also determined based on the data in the close
neighborhood of TC. Finally it has been shown that the critical amplitude
in the temperature studies depends mainly on the excess enthalpy whereas
in the pressure studies on the excess volume.
Ph.D.
thesis (for private use only)
List of "dielectric" publications:
- M. Paluch, P. Habdas, S. J. Rzoska, T. Schimpel,
"Electric permittivity in the one- and two-phase region
of 1-nitropropane-hexadecane near-critical solution",
Chem. Phys. 213, 483 (1996).
- S.J. Rzoska, M. Paluch, A. Drozd-Rzoska, P. Habdas, P. Urbanowicz,
"Pressure behaviour of dielectric permittivity on apporaching the
critical consolute point",
Europhys. Lett. 45, 334 (1999).
- P. Habdas, M. Paluch, A. Drozd-Rzoska, P. Malik, S.J. Rzoska,
"Pressure and temperature studies of dielectric permittivity in the
homogeneous phase of nitrobenzene-dodecane binary mixture",
Chem. Phys. 241, 351 (1999).
- P. Habdas, P. Urbanowicz, P. Malik, S.J. Rzoska,
"Temperature studies of dielectric permittivity and mass density pretransitional
anomalies in binary mixtrues",
Phase Transitions, (2000).
- A. Drozd-Rzoska, S.J. Rzoska, M. Gorny, P. Habdas, J. Ziolo,
"On critical behavior of "linear" and "nonlinear" dielectric permittivity
on approaching the critical consolute point",
IEEE (2000).
- S.J. Rzoska, A. Drozd-Rzoska, J. Ziolo, P. Habdas,
"On the critical anomaly of dielectric permittivity for the temperature
and pressure paths on approaching the critical consolute point",
sent to Phys. Rev. E (2000).
Other papers relevant to the topic can be found in the references of
my Ph.D. thesis.