Traceable measurements of the static permittivity of dielectric reference liquids over the temperature range 5–50 °C

Abstract

Measurements of the static permittivity of pure samples of eight polar liquids—acetone, butan-1-ol, dimethyl sulphoxide, ethanediol, ethanol, methanol, propan-1-ol and water—and two non-polar liquids—cyclohexane and silicone oil—were measured in a shielded micrometer-driven, parallel-plate admittance cell at temperatures from 5 to 50 °C. The experimental method, which requires measurements of capacitance using a four-terminal-pair impedance analyser, is described in detail. The full measurement results have been tabulated separately in a National Physical Laboratory report. The present paper provides a comparative study of these latest results with previously published data and also describes the details of the uncertainty analyses employed. Admittance cell measurement techniques are also briefly reviewed to put this work into context.

Properties and electrokinetic behavior of non-dilute colloidal suspensions

“…When dealing with a heterogeneous suspension of particles, the electrical permittivity is defined as the value of a sample of homogenous material that has the same resistance and capacitance as that of the suspension. Many methods have been adopted by researchers to study the frequency dependence of permittivity of colloidal suspensions (Ahualli et al, 2006;Gregory and Clarke, 2005). Dielectric spectroscopy (sometimes called low frequency dielectric dispersion) is one of the most common methods used to study the frequency dependence of the complex permittivity of a suspension in the frequency range of 0.1 KHz-1 MHz (Hollingsworth and Saville, 2004;Rosen and Saville, 1991).…”

“…Dielectric spectroscopy (sometimes called low frequency dielectric dispersion) is one of the most common methods used to study the frequency dependence of the complex permittivity of a suspension in the frequency range of 0.1 KHz-1 MHz (Hollingsworth and Saville, 2004;Rosen and Saville, 1991). (Gregory and Clarke, 2005) developed a shielded micrometer driven, parallel plate admittance cell device for measuring the permittivity of liquids in the frequency range of 0.1-1 MHz and 5-50°C temperature range. The permittivity in this case, is obtained by measuring the capacitance of the cell filled with the homogeneous liquid sample.…”

Remarks on the Measurement of Static Permittivity Through a Classical Description

“…In practice the material would respond to a voltage step input, while the estimated ε would be the value assumed by the permittivity during the "first instances" of the main transient, i.e., for t τ eff . We believe that the present analysis may provide a contribute to the characterization of static permittivity and to possible development of capacitance standards [17][18][19]. …”

Classification and adulteration control of vegetable oils based on microwave reflectometry analysis

“…C p also takes into account possible fringing effects at the probe end (Gregory and Clarke, 2005). The effect of the parasitic capacitance was de-embedded by following the procedure described in Cannazza et al (2011).…”