Contact electrification phenomena and powder surface treatments

Oguchi, Toshihiko; Tamatani, Masaaki

doi:10.1016/0043-1648(93)90202-w

Cited by 18 publications

(13 citation statements)

References 7 publications

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“…To investigate the effect of the coating materials and their contents on contact charging, titania particles of 0.15-0.3m in diameter coated with alumina and silica were brought into contact with iron. The experimental results are shown in Fig. 13 (Oguchi and Tamatani, 1993). The contact charge shifted toward the positive direction with an increase in the alumina content, while the silica contributed to a shift toward the negative direction.…”

Section: Surface Treatment and Charge Control Agentsmentioning

confidence: 96%

See 1 more Smart Citation

Triboelectric charging of powders: A review

Matsusaka

Maruyama

Matsuyama

et al. 2010

Chemical Engineering Science

505

336

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Particles are often electrostatically charged by frictional contact during powder-handling operations. This phenomenon is called 'triboelectric charging' or 'contact electrification'. The charged particles cause problems such as particle deposition and adhesion. In addition, if particles are excessively charged, an electrostatic discharge may occur, which can pose a risk of fire and explosion hazards; thus, to mitigate the adverse effects, it is important to elucidate the underlying triboelectric charging mechanisms. The electrostatics is, on the other hand, very useful in a number of applications that have been developed using the principles. In this review, the basic concepts and theories of charge transfer between solid surfaces are summarized, and chemical factors depending on materials and environmental effects are described. To theoretically analyze the process of particle charging, relevant models are discussed. Using the models, particle charging by repeated impacts on a wall is formulated. To experimentally evaluate particle charging, measurement and characterization methods are outlined. Furthermore, important applications and computer simulations are described.

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Section: Surface Treatment and Charge Control Agentsmentioning

confidence: 96%

“…Only the toner is blown off through the filter and the carrier with a charge equivalent but opposite in polarity to that of the blown-off toner is left in the cage. The variation of the charge in the cage is measured by an electrometer (Oguchi and Tamatani, 1993)…”

Section: Specific Chargementioning

confidence: 99%

Triboelectric charging of powders: A review

Matsusaka

Maruyama

Matsuyama

et al. 2010

Chemical Engineering Science

505

336

View full text Add to dashboard Cite

show abstract

“…The cascade method to measure the charge of particles cascading down an inclined plate has often been used for characterizing particle tribocharging because of its ease of operation [18][19][20]. However, the motion of small particles that are on the surface is disturbed by adhesive forces such as van der Waals forces [21] and electrostatic forces [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Mizutani

Yasuda

Matsusaka

2015

Advanced Powder Technology

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a b s t r a c tIn this study, we propose a new method to effectively characterize particle tribocharging caused by repeated contact with a wall in an external electric field. We perform experiments using a two-stage system consisting of two inclined vibrating plates and electrodes. The mass flow rate and charge of particles were controlled at the first vibrating plate, and the charge that was transferred from the plate to the particles was obtained from the difference between the charges on particles at the lower and upper ends of the second vibrating plate. In addition, electric currents generated by the charge transfer were simultaneously measured at the second vibrating plate. From these measurements, we verified that the charge balance in this system holds. Furthermore, we found that the charge transfer depends on various factors, such as the initial charge, chemical and electrical properties, travel length of particles, and the external electric field. We also found that the equilibrium charge of particles depends on the chemical property and external electric field. The equilibrium charge and the rate of tribocharging were evaluated analytically from the relationship between the initial and transferred charges without changing the travel distance of particles. This method enables the rapid and reliable analysis of the particle tribocharging process.

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“…18 Methods used for studying contact electrification of many particles include allowing them to slide down a solid surface by gravity, 19 vibrating them on a solid surface, 20 forcing them through a pipe via the flow of a carrier gas, 21,22 or agitating them in a fluidized bed. 23,24 These methods, however, typically involve a large number of particles.…”

Section: ■ Introductionmentioning

confidence: 99%

Charging of Multiple Interacting Particles by Contact Electrification

et al. 2014

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Many processes involve the movement of a disordered collection of small particles (e.g., powders, grain, dust, and granular foods). These particles move chaotically, interact randomly among themselves, and gain electrical charge by contact electrification. Understanding the mechanisms of contact electrification of multiple interacting particles has been challenging, in part due to the complex movement and interactions of the particles. To examine the processes contributing to contact electrification at the level of single particles, a system was constructed in which an array of millimeter-sized polymeric beads of different materials were agitated on a dish. The dish was filled almost completely with beads, such that beads did not exchange positions. At the same time, during agitation, there was sufficient space for collisions with neighboring beads. The charge of the beads was measured individually after agitation. Results of systematic variations in the organization and composition of the interacting beads showed that three mechanisms determined the steady-state charge of the beads: (i) contact electrification (charging of beads of different materials), (ii) contact de-electrification (discharging of beads of the same charge polarity to the atmosphere), and (iii) a long-range influence across beads not in contact with one another (occurring, plausibly, by diffusion of charge from a bead with a higher charge to a bead with a lower charge of the same polarity).

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Contact electrification phenomena and powder surface treatments

Cited by 18 publications

References 7 publications

Triboelectric charging of powders: A review

Triboelectric charging of powders: A review

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Charging of Multiple Interacting Particles by Contact Electrification

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