Effect of surface charge on hydrophobicity levels of insulating materials

Moreno-Villa, V.M.; Ponce-Velez, M.A.; Valle-Jaime, E.; Fierro-Chavez, J.L.

doi:10.1049/ip-gtd:19982361

Cited by 34 publications

(10 citation statements)

References 13 publications

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“…If the charged particles deviate from the appropriate range of the q/m values, for most of the particles to move with the same driving voltage, the charged particles will show an irregular movement because of the obstruction of their movement. Moreover, the electrical and optical properties of the panel must be degraded with a short lifetime [7,8].…”

Section: Resultsmentioning

confidence: 99%

“…When the positively and negatively charged particles are in the same cell without any bias voltage, the charged particles exert a Coulomb force (i.e., attractive and repulsive force) and an image force is associated with the charged particles and the conductive electrodes. These forces are in proportion with the value of q/m, where q is the amount of the electric charge of a particle, and m is the mass of the particle [7,8]. Therefore, a force greater than the abovementioned forces is required to move the charged particles.…”

Section: Introductionmentioning

confidence: 99%

“…The values of q/m vary during the particle-mixture and particle-insertion processes. Additionally, this variation in q/m induces an irregular movement of the charged particles by non-moveable charged particles, including a short lifetime, a high driving voltage, and degradation of the optical properties [8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Discharging Process on Electrical and Optical Properties in Charged Particle-type Reflective Electronic Display

Kim

2014

Transactions on Electrical and Electronic Materials

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In this study, the use of a discharging process for charged particles is proposed to achieve an ideal electrical balance or neutralization and to improve the electrical and optical properties of a reflective electronic display. Here, negatively charged particles (white) and positively charged particles (black) are used. The q/m (charge per mass for a particle) values of the black and white particles are + 4.5 μC/g and -4.5 μC/g, respectively. We compared the movement of the charged particles by varying their discharging time. Stable movement of the charged particles is obtained with an appropriate discharging time, which resulted in improvements of the optical properties of the panel.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Discharging Process on Electrical and Optical Properties in Charged Particle-type Reflective Electronic Display

Kim

2014

Transactions on Electrical and Electronic Materials

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“…In another particle-insertion method, namely the corona-gun method, charged particles are accelerated by the high voltage bias of over 200 V at the electrode of a corona gun, and are piled on the lower substrate [11]. This method, in common with the simple particle-loading method, cannot filter the non-moving particles; and, additionally, results in an increase in electric and mechanical damage of particles during the particle-insertion process [12].…”

Section: Particle-moving Methodsmentioning

confidence: 99%

An Analysis of Driving Property of a Reflective Electronic Display Fabricated by Using Filtering Method of Non-moving Particles

Kim

2012

Transactions on Electrical and Electronic Materials

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The driving properties of a particle-insertion method that filters non-moving particles are analyzed, by measuring its optical and electrical properties. An area that is occupied by the moved particles is proposed, as a desirable evaluation method for a reflective display. To compare the driving property of the particle-moving method with that of the reported simple particle-loading method, two panels are fabricated, according to the different particleinsertion methods, in the same panel condition, of which the width of ribs is 30 μm, the cell size is 220 μm × 220 μm, the cell gap is 116-120 μm, the q/m value of the black particles is +1.8 μC/g and that for the white particles is -4.3 μC/ g. The particle-moving method has a filtering effect which excludes the non-moving particles, inserting only movable particles into the respective cell, so that a panel fabricated by the particle-moving method can drive most of the particles in a cell. Also, most of the particles move at the threshold voltage of 40 V, with enhanced reflectivity. The driving property is also verified by measurement of the occupation rate of the moved particles.

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“…One electrode is connected to the high voltage source through a resistance of 10 MΩ and the other electrode connected to ground. Figure 2 shows the experimental setup used to measure the surface charge accumulation on OIP material [27]. The sample was charged by non-contact corona discharge using needle plane electrode configuration at position 1.…”

Section: B Test Electrodementioning

confidence: 99%

Understanding the Surface Discharge Activity with Thermally Aged Nanofluid Impregnated Paper Insulating Material

Swati

Sarathi

Sharma³

2017

ijeei

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SDIV of OIP material gets altered with thermal ageing temperature of OIP material, supply voltage frequency and the harmonic content in the supply voltage. The UHF signal radiated due to surface discharges formed under AC voltage, high frequency AC voltages and with harmonic voltages, have dominant frequency at about 0.9 GHz. Surface charge accumulation studies indicate that thermal ageing have high impact on amount of charge accumulation. Also number of layers of insulation have high charge trap density, which is ascertained through tdv/dt plot. The amount of charge accumulated is high with pressboard impregnated in titania nanoparticle dispersed transformer oil. The SD activity occurs at the rising portion of AC voltage and at high dv/dt's with harmonic AC voltages. More number of discharges occur with OIPs thermally aged at higher temperature. Physico-chemical changes clearly indicate not much of a change occurs with transformer insulation due to thermal ageing.

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Effect of surface charge on hydrophobicity levels of insulating materials

Cited by 34 publications

References 13 publications

Effect of Discharging Process on Electrical and Optical Properties in Charged Particle-type Reflective Electronic Display

Effect of Discharging Process on Electrical and Optical Properties in Charged Particle-type Reflective Electronic Display

An Analysis of Driving Property of a Reflective Electronic Display Fabricated by Using Filtering Method of Non-moving Particles

Understanding the Surface Discharge Activity with Thermally Aged Nanofluid Impregnated Paper Insulating Material

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