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Electrowetting on this dielectric-coated surface is called electrowetting-on-dielectric (EWOD) [7] to distinguish it from the conventional electrowetting on the bare electrode. Electrowetting can be demonstrated by replacing the metal electrode in the EWOD system by a semiconductor.
Optoelectrowetting (OEW) is a method of liquid droplet manipulation used in microfluidics applications. This technique builds on the principle of electrowetting, which has proven useful in liquid actuation due to fast switching response times and low power consumption.
A liquid dielectric is a dielectric material in liquid state. Its main purpose is to prevent or rapidly quench electric discharges . Dielectric liquids are used as electrical insulators in high voltage applications, e.g. transformers , capacitors , high voltage cables , and switchgear (namely high voltage switchgear ).
A simple ER fluid can be made by mixing cornflour in a light vegetable oil or (better) silicone oil. There are two main theories to explain the effect: the interfacial tension or 'water bridge' theory, [4] and the electrostatic theory. The water bridge theory assumes a three phase system, the particles contain the third phase which is another ...
Dielectric liquids are divided into single- and two-phase applications, which differ in whether or not the cooling fluid turns into a gas during the cooling cycle. Single-phase immersion uses a circulation method for the dielectric liquid across hot electronic components and to a heat exchanging approach.
The lower the resulting breakdown voltage, the poorer the quality of the transformer oil. The transformer oil is filled in the vessel of the testing device. Two standard-compliant test electrodes with a typical clearance of 2.5 mm are surrounded by the dielectric oil.
where ε is the dielectric constant of the electrolyte solution and ε 0 is the vacuum permittivity. This equation can be further simplified using the Debye-Hückel approximation =, where 1 / k is the Debye length, used to describe the characteristic thickness of the electric double layer. The equations for potential field within the double ...
Electrical breakdown in an electric discharge showing the ribbon-like plasma filaments from a Tesla coil.. In electronics, electrical breakdown or dielectric breakdown is a process that occurs when an electrically insulating material (a dielectric), subjected to a high enough voltage, suddenly becomes a conductor and current flows through it.