Agilent 5991-4739EN Materials Measurement Liquid Materials - Application Brief c20140805 [6] free download

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Keysight Technologies Materials Measurement: Liquid Materials Application Brief 02 | Keysight | Materials Measurement: Liquid Materials - Application Brief Overview Problem There are increasing demands for the electrical measurement to For scientists who are not familiar with the electrical measure- investigate the properties of liquid materials that is characterized ment, it is not easy to understand the electrical model of liquid by permittivity and conductivity. materials. Permittivity, also called as dielectric constant is related to the Complex permittivity measurement is done by measuring the electric polarization and conductivity is the measure of a mate- electrical impedance of the material using LCR meters or imped- rial's ability to conduct electric current when applied an electri- ance analyzers. Although they are accepted as standard instru- cal field. Dielectric spectroscopy, also known as electrochemical ments in evaluating electronic components and materials, special impedance spectroscopy (EIS) measures permittivity and conduc- devices will be required when applying to liquid materials. tivity as a function of frequency. Complex permittivity measure- ment enables not only to evaluate electrical property but also Dielectric spectroscopy is suited for in-situ characterization of to analyze the composition, the structure of the heterogeneous colloidal dispersion or molecular dynamics however it requires system and the interaction of the molecules in the liquid. accurate measurement system over a wide frequency range. The electrical measurement is fast, non-destructive, non-invasive and cost effective method and also allows continuous monitor- ing of liquid material without any pretreatment. It can be applied Solution to liquid, emulsion and colloidal suspension including chemical Impedance analyzers are the best instruments for the evaluation materials, crude oil, cosmetics, wine or whiskey brewing as well of electronic components and materials. The Keysight Technolo- as blood and biological cell. gies, Inc. 16452A liquid test fixture is designed to be used with the Keysight E4990A impedance analyzer for the permittivity Complex permittivity can be derived from the electrical imped- measurement of liquid materials. Their four-t