Publication

Factors Affecting Interfacial Polarization and Dielectric Behavior of Wet Soils

Dani Or, Yixing Chen
2005
Conference Papers

Résumé

The presence of free charges and numerous discontinuities separating liquid, gas, and solid phases in partially-saturated soils give rise to a relatively understudied phenomenon of interfacial polarization that could impact bulk dielectric permittivity measurements using TDR and similar soil-embedded sensors. Evidence suggests a complex interplay between the response of complex dielectric permittivity spectrum to changes in ambient temperature and amount of ionic charges present in the wet soil. Model calculations based on Hanai's theory are supported by direct measurements using Network Analyzer showing that at low frequency (

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https://infoscience.epfl.ch/entities/publication/4fe9f034-6dd1-4d68-9cf2-6f495980284e

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Dani Or, Yixing Chen
2005
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/4fe9f034-6dd1-4d68-9cf2-6f495980284e

À propos de ce résultat

Concepts associés (32)

Surface charge

A surface charge is an electric charge present on a two-dimensional surface. These electric charges are constrained on this 2-D surface, and surface charge density, measured in coulombs per square meter (C•m−2), is used to describe the charge distribution on the surface. The electric potential is continuous across a surface charge and the electric field is discontinuous, but not infinite; this is unless the surface charge consists of a dipole layer. In comparison, the potential and electric field both diverge at any point charge or linear charge.

Electrical resistivity and conductivity

Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m).

Spectroscopie diélectrique

Dielectric spectroscopy (which falls in a subcategory of impedance spectroscopy) measures the dielectric properties of a medium as a function of frequency. It is based on the interaction of an external field with the electric dipole moment of the sample, often expressed by permittivity. It is also an experimental method of characterizing electrochemical systems. This technique measures the impedance of a system over a range of frequencies, and therefore the frequency response of the system, including the energy storage and dissipation properties, is revealed.

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Organic matters, but inorganic matters too: column examination of elevated mercury sorption on low organic matter aquifer material using concentrations and stable isotope ratios

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