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Transient DC-conductivity measurements of anthracene solutions in cyclohexane have provided evidence for solvent ionization following irradiation with 248nm excimer laser pulses. A mechanism resulting in a cyclohexane cation and an anthracene anion as near neighbors can explain the experimental observations: a high mobility species, 7–8 absorbed photons per solute molecule, intensity dependence, and...
Dielectrophoresis of particles in liquid media has been well studied under the assumption of ideal dielectrics. Real dielectrics exhibit non-zero conductivity, however, and this fact brings about behaviours unpredictable by the model of ideal dielectrics. In the present work some attempts to experimentally investigate the dielectrophoretic motion of a lossy dielectric sphere suspended in a liquid...
The dielectric, conductivity and ultrasonic measurements for p-azoxy anisole are done in its solution in benzene and carbon tetrachloride at room temperature. The dipole moment and relaxation time are computed using a new alternative method as suggested by Johri(1984) and compared with Gopala Krishna microwave method, Higasi and Guggenheim statical methods. Adiabatic compressibility, Rao number, Vanderwaals...
The diffuse part of the electric double layer spontaneously present at an insulator/liquid interface can be displaced by an A.C. field. It is shown that the diffuse part of the double layer acts as a reservoir of ions which gives rise to a time-limited unipolar injection. At low fields, tanδ increases when the voltage V is increased. At high fields, the reservoir of charges depletes quickly and the...
The various mechanisms proposed to explain the conductivity of organic dielectric liquids at high fields (50 to 2000 kV/cm) are considered and their range of validity assessed.
The research work that has been carried out regarding the electrical conductivity of dielectric liquids, under various experimental conditions for industrial purposes or for physical investigations of fundamental character, has not yet been able to explain fully the conduction phenomenon. This is because the problem of conductivity in high fields is quite complicated. Although a considerable amount...
We have determined, via electrophoresis, the zeta-potential at solid/non-polar liquid interfaces. The particles used were either metallic (Al, Ag, Pt) or non-conducting (capacitor paper, polyethylene) ones. The liquid was cyclohexane and its resistivity was modified by the addition of an electrolyte: triisoamylammonium picrate (TiAP). The zeta-potential and thus the electrical charge at the interface,...
Dielectric permittivity, ε′, and loss factor, ε″/ε′, of tert-butyl alcohol (TBA) have been measured in the temperature range from 282 K to 323 K and at spot frequencies 0.7,25,60 and 100 MHz in cooling and heating cycles. Refractive index and d.c. conductivity of the sample have also been measured. Both ε′ and ε″ exhibit a sharp transition at a temperature below its freezing temperature in the cooling...
Hot electron effects in liquid xenon are quantitatively analyzed including electric field dependent drift mobilities and reaction rate constants (with SF6) and also conductivity relaxation following subnano-second pulsed ionisation. The interrelations between the effects are shown and a value of the electron energy exchange frequency of VK=(1.0±0.2)×109 (Te/T)0,5 s−1 at 165 °K is derived from experimental...
This study deals with the kinetics of the field-dissociation effect in solutions of AOT surfactant in cyclohexane. The conductance increases with field strength as predicted by Onsager's theory, but large deviations from the Langevin relaxation time are observed at AOT concentrations greater than 10−3 Ml−1.
Kinetics of high field conductivity in water has been studied using the original experimental technique. It was discovered anomalous temporal behavior of water conductivity in presence of H+ ions or dipolar ions.
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