A new system for measuring the charging tendency of solid particles

Kittaka, Shigeyoshi; Murata, Yuji

doi:10.1016/0304-3886(76)90002-4

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…The characteristics of the triboelectric charging can be evaluated by various methods; however, the particles may not be sufficiently charged. Kittaka and Murata (1976), Rowley (2001), and Matsusaka et al (2008b) proposed a method using a cylinder in which particles can be charged by a circular airflow (Fig. 53).…”

Section: General Techniques For Characterizationmentioning

confidence: 99%

Triboelectric charging of powders: A review

Matsusaka

Maruyama

Matsuyama

et al. 2010

Chemical Engineering Science

515

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: General Techniques For Characterizationmentioning

confidence: 99%

Triboelectric charging of powders: A review

Matsusaka

Maruyama

Matsuyama

et al. 2010

Chemical Engineering Science

515

336

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“…The whole line was then relocated to the bottom of the chamber. Next, it was replaced with 3/8 inch copper tubing and valve 28 Arlehlr L.n.i and relocated to above the rotating cylinder. The 1 inch pipe was replaced with the 3/8 inch tubing to increase the gas velocity through this line.…”

Section: Arl_hirmentioning

confidence: 99%

The chemical enhancement of the triboelectric separation of coal from pyrite and ash: A novel approach for electrostatic separation of mineral matter from coal

Gustafson¹,

DiMare²,

Sabatini³

1992

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“…The increase in the adhesive tendency probably is caused by changes in the electrical force component due to triboelectrical charging. Different drug materials will possess different tendencies to be triboelectrically charged with the result that rates of adhesion saturation with blending time will differ (Kittaka & Murata 1976). Verification of electro-static charge accumulation in the system is not possible in freshly prepared mixtures because of the limitations of the air stream Faraday cage for determining the charge measurement at the interactive unit interface due t o incomplete drug particle removal from the carrier and interaction with the cage (Kulvanich & Stewart 1 9 8 7~) .…”

Section: * Correspondencementioning

confidence: 99%

“…During powder processing, the number of contacts and collisions can be increased by increasing the speed of particle motion (i.e. the degree of agitation in the mixer) and the time of processing (Peterson 1954;Kittaka & Murata 1976;Kittaka et all979;Lee & Weser 1979;Staniforth & Rees 1982). For example, during the preparation of an interactive mixture, the exchange of adherent drug particles between the carriers occurs as the particles are displaced from one carrier and randomly readhere to another (Travers & White 1971: Travers 1975Barbosa Canovas & Peleg 1985).…”

mentioning

confidence: 99%

The effect of blending time on particle adhesion in a model interactive system

Kulvanich

Stewart

1987

Journal of Pharmacy and Pharmacology

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The adhesive tendency of drug particles in a model drug carrier interactive system increased with blending time. The degree of interaction was measured using a centrifuge technique; the resultant adhesion profile of per cent retained on the carrier versus the square of the speed of rotation was a logarithmic normal function that allowed the determination of the S50 to characterize the adhesion tendency. The relative degree of adhesion of the drug particles in the interactive mixtures and the rate to attain adhesion saturation in the interactive system during the mixing process was markedly different for the three mixtures studied. The increased adhesive tendencies during blending were probably associated with triboelectrification of the drug and carrier particles.

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A new system for measuring the charging tendency of solid particles

Cited by 13 publications

References 2 publications

Triboelectric charging of powders: A review

Triboelectric charging of powders: A review

The chemical enhancement of the triboelectric separation of coal from pyrite and ash: A novel approach for electrostatic separation of mineral matter from coal

The effect of blending time on particle adhesion in a model interactive system

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