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The electrical resistivity of liquid (GST) is obtained from dc–voltage measurements performed on thin GST films as well as from device-level microsecond-pulse voltage and current measurements performed on two arrays (thicknesses: 20 2 nm and 50 5 nm) of lithographically defined encapsulated GST nano-/microwires (length: 315 to 675 nm; width: 60 to 420...
This paper aims at studying the behavior of water drops deposited on dielectric composite insulating surfaces under DC voltage stress. Experiments were conducted on the coalescence of pairs of sessile water droplets. It particularly analyzes their behavior depending on their size, conductivity and location with respect to electrodes as well as the hydrophobicity of insulator. The conditions for coalescence...
We show a simple method of measuring thermal conductivity and thermal diffusivity of liquids. For this we used stacked liquid calorimeter chips fabricated with thin film membranes for optimum thermal isolation of the sample under test. DC joule heating allows measurement of conductivity, AC joule heating allows measurement of diffusivity. We measured the response for iso-propanol (IPA), methanol and...
In this paper, a novel adaptive front-end circuit for measuring liquid conductivity is proposed. To deal with the chemically active environment around the sensor electrodes, the dc component of the excitation signal is set to be zero. The proposed system is able to generate a symmetrical excitation signal with a single power supply even when one terminal of the sensor electrode is grounded. The use...
The progressive improvement in the purification techniques of dielectric liquids renders the measurement of their resistivity more and more difficult, sometimes impossible (especially at room temperature) with conventional AC bridges (SCHERING bridge, transformer ratio bridge) they are not sensitive enough to detect losses (tanδ) or conductance G of a cell of capacitance C filled with a liquid of...
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