Charging of Insulator Surfaces by Ionization and Transport in Gases

Cooke, C. M.

doi:10.1109/tei.1982.298553

Cited by 96 publications

(37 citation statements)

References 5 publications

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“…In the present study, the surface charge decay characteristics of epoxy nanocomposites were analyzed through electrostatic voltmeter. It is possible to deposit charges on surface of the insulating material through sharp‐pointed emitter process and by corona discharges process . In the present study, corona charging process (Fig.…”

Section: Methodsmentioning

confidence: 74%

Understanding surface discharge activity with epoxy silicon carbide nanocomposites

Sarathi

Sahoo

Chen

et al. 2017

Polymer Engineering & Sci

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Surface discharge inception voltage (SDIV) with epoxy silicon carbide nanocomposite material in LN 2 medium is about three times higher than that in air. Under AC voltage that SDIV increases with increase in wt% of silicon carbide (SIC) material in epoxy nanocomposites. Dielectric measurements indicates an increase in temperature of the specimen and the weight percentage of SIC filler in epoxy resin increases the permittivity of the material. Also, irrespective of percentage of SiC in epoxy resin, the tan(d) reduces with increase in frequency and the converse at room temperature. The UHF signal measured during surface discharge activity in air/LN 2 medium has frequency content in the range of 0.5-1.5 GHz. The charge decay characteristics of epoxy SiC nanocomposites indicate the deposited charge is less and the charge decay time reduces with increase in wt% of SiC in epoxy resin. The surface roughness caused due to surface discharge activity is high under negative DC voltage compared with positive DC/AC voltage. The phase resolved partial discharge (PRPD) analysis indicates discharges occur at the near peak of the AC voltage on inception of surface discharge and at higher stress it appears at the rising portion of AC voltage.

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Section: Methodsmentioning

confidence: 74%

Understanding surface discharge activity with epoxy silicon carbide nanocomposites

Sarathi

Sahoo

Chen

et al. 2017

Polymer Engineering & Sci

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“…The charge accumulation theory has predicted that, when an electric field was applied across an insulating substrate, the charges would accumulate on the substrate surface by several means such as the injecting effect of the electrode. The charge density is closely associated with the accumulation time ( t ) and obeys the injection law σ = f ( E ) 44–46. For further demonstration, Figure 4 shows the position dependence of the charge density on the surface of the glass substrate at different accumulating time t .…”

Section: Resultsmentioning

confidence: 86%

Electrically induced linear locomotion of polymer gel in air

Liang

Xu²,

Weng

et al. 2007

J Polym Sci B Polym Phys

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A electromechanical gel, which could be driven in air by a DC electric field, was developed using poly(vinyl alcohol)/dimethylsulfoxide gel. When the applied electric field exceeds a certain threshold, the gel exhibited a continuous and linear crawling motion. The result indicated that, under the applied electric field of 275 V/ mm, the maximum crawling velocity of the gel could reach v ¼ 1.63 mm/s, which is about 80 times larger than that reported in earlier works. At a proper range of the driving time, the average crawling speed and crawling direction could be well controlled by the external electric field. Furthermore, some factors, which have influence on the critical driving electric field of the gel, such as the swelling degree of the gel and the apparent contact area between the gel and substrate, were studied. For the first time, a mechanism based on the strong electrostatic interaction between the external electric field and the charges accumulated in the gel-air and substrate-gel interfacial regions was put forward to explain the novel motion.

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“…Upon applying a large voltage, the surface of the PS windows might become charged; this charging could be from either charge injection 12 or air ionization and deposition. 13 Experimentally, we are able to visualize a corona at the corners of the gold electrode as well as observe the ionic breeze from the electrode when using the high voltages. These charges would shield the glass spheres on the windows from the electric field inside the capacitor, so that even these spheres could be lifted by the fringe electric field above the surface.…”

Section: ͑1͒mentioning

confidence: 91%

Mechanics of a process to assemble microspheres on a patterned electrode

Zhu

Suo

Winkleman

et al. 2006

Applied Physics Letters

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A process has been demonstrated recently to assemble microspheres on a patterned electrode under the influence of an applied voltage. Here we examine the mechanics of this process, and describe both the conditions under which excess microspheres jump off the electrode when the voltage is applied, and the forces that attract the remaining microspheres to the desired positions. A quantitative mechanistic understanding of this process rationalizes experimental observations, provides scaling relations, and suggests modifications of the process.

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Charging of Insulator Surfaces by Ionization and Transport in Gases

Cited by 96 publications

References 5 publications

Understanding surface discharge activity with epoxy silicon carbide nanocomposites

Understanding surface discharge activity with epoxy silicon carbide nanocomposites

Electrically induced linear locomotion of polymer gel in air

Mechanics of a process to assemble microspheres on a patterned electrode

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