Methods for investigating the electrostatic behaviour of powders

Boschung, P.; Glor, Martin

doi:10.1016/0304-3886(80)90007-8

Cited by 33 publications

(6 citation statements)

References 14 publications

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“…However, it was interesting to note a significant increase of dynamic charge of lactose when ambient RH was increased beyond 35% in this study. A number of studies had reported increased particle electrostatic charge upon RH increase (2,12,28,38,(54)(55)(56). Rowley and Mackin (12) observed an increased triboelectrification of α-lactose monohydrate on polyvinyl chloride surface from 0% to 20% RH and attributed this to moisture sorption phenomenon.…”

Section: Effect Of Ambient Rh On Dynamic Chargementioning

confidence: 95%

Investigation of Electrostatic Behavior of a Lactose Carrier for Dry Powder Inhalers

et al. 2008

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Section: Effect Of Ambient Rh On Dynamic Chargementioning

confidence: 95%

Investigation of Electrostatic Behavior of a Lactose Carrier for Dry Powder Inhalers

et al. 2008

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“…However, even repeated experiments with the same samples showed a range in charge magnitude results. Although this is common in particulate electrostatic problems [e.g., Boschung and Glor, 1980], natural variations within the pumice samples also produced different particle sizes and particle masses per impact between successive experiments. The net specific charges calculated from the frictiondominated rotational experiments were smaller than those from the impact experiments.…”

Section: Ion Productionmentioning

confidence: 99%

“…It is also well documented that industrial powders transported pneumatically readily charge through impacts with pipe walls and other particles [Boschung and Glor, 1980]. plumes is necessary in order to improve our knowledge of electrostatic particle aggregation processes, the electrical hazards from eruptions, and our understanding of atmospheric potential gradient and particle charge measurements made in the field.…”

Section: Introductionmentioning

confidence: 99%

“…This technique can generate specific charges in the range of 10 -8 to 10 '9 C kg '• [Hatakeyama and Uchikawa, 1952], and although Kikuchi and Endoh [ 1982] did record values of up to 10 -5 C kg -•, they thought the process more analogous to the charging of windblown ash rather than any processes which occur during eruptions. It is also well documented that industrial powders transported pneumatically readily charge through impacts with pipe walls and other particles [Boschung and Glor, 1980]. plumes is necessary in order to improve our knowledge of electrostatic particle aggregation processes, the electrical hazards from eruptions, and our understanding of atmospheric potential gradient and particle charge measurements made in the field.…”

Section: Introductionmentioning

confidence: 99%

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Volcanic plume electrification: Experimental investigation of a fracture‐charging mechanism

James¹,

Lane²,

Gilbert³

2000

J. Geophys. Res.

131

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Abstract. Although ashfall from particulate volcanic plumes is known to be highly electrically charged, little is known about the charging mechanism. We describe experiments designed to investigate the particle charges generated from the fracture of pumice. Small silicate particles were produced in the laboratory during collisions between two samples cut from pumice clasts. The net charge magnitudes detected on these particles are similar to those previously measured on ashfall from volcanic plumes (-10 's to 10 -6 C kg-•). This net charge is also shown to be the result of a small imbalance between the sums of individual particle charges of both polarities, which are up to several orders of magnitude larger than the net charge. The magnitude of both the net and single polarity specific charges were only weakly affected by changes of relative humidity, but single polarity charges increased steadily with increasing sample impact velocities. The dominant charging process during the experiments was that of material fracture. The charging mechanism is thus interpreted to be fractoemission (the release of nuclear particles from fresh crack surfaces) occurring during the production of the silicate particles. This implies that the electrification of volcanic plumes could be the result of brittle fragmentation of magma or pumice clasts within the upper regions of the conduit and in the jet region of the plume.

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“…during pneumatic transport) to between 10 −7 and 10 −3 C kg −1 (Boschung and Glor 1980), with some of the differences in both charge magnitude and polarity attributable to specific area and particle size, with the higher charge densities on powders of higher surface area (about 500 m 2 kg −1 , Cross and Farrer 1982). Early electrification experiments on volcanic ash, which involved pouring ash particles down inclined planes (e.g.…”

Section: Solid-based Chargingmentioning

confidence: 98%

Electrical Charging of Volcanic Plumes

et al. 2008

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Many explosive terrestrial volcanic eruptions are accompanied by lightning and other atmospheric electrical phenomena. The plumes produced generate large perturbations in the surface atmospheric electric potential gradient and high charge densities have been measured on falling volcanic ash particles. The complex nature of volcanic plumes (which contain gases, solid particles, and liquid drops) provides several possible charging mechanisms. For plumes rich in solid silicate particles, fractoemission (the ejection of ions and atomic particles during fracture events) is probably the dominant source of charge generation. In other plumes, such as those created when lava enters the sea, different mechanisms, such as boiling, may be important. Further charging mechanisms may also subsequently operate, downwind of the vent. Other solar system bodies also show evidence for volcanism, with activity ongoing on Io. Consequently, volcanic electrification under different planetary scenarios (on Venus, Mars, Io, Moon, Enceladus, Tethys, Dione and Triton) is also discussed.

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Methods for investigating the electrostatic behaviour of powders

Cited by 33 publications

References 14 publications

Investigation of Electrostatic Behavior of a Lactose Carrier for Dry Powder Inhalers

Investigation of Electrostatic Behavior of a Lactose Carrier for Dry Powder Inhalers

Volcanic plume electrification: Experimental investigation of a fracture‐charging mechanism

Electrical Charging of Volcanic Plumes

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