Acid-base components of solid surfaces and the triboelectric series

Clint, John H.; Dunstan, Timothy S.

doi:10.1209/epl/i2001-00244-6

Cited by 36 publications

(29 citation statements)

References 9 publications

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“…As pointed out by Duke, 27 Follows,28 and Brennan, 29 the polarity of net surface charge carried by polymer materials when electrified depends on the group possessed by the polymers. And Clint 30 and Veregin 31,32 observed that solid surfaces with significant Lewis basicity (as determined from contact-angle measurements or inverse gas chromatography) tended to become positively charged upon contact electrification, whereas surfaces with significant Lewis acidity tended to become negatively charged.…”

Section: Contact Electrification Modeling and Discussionmentioning

confidence: 99%

Contact electrification by collision of homogenous particles

Xie¹,

G.²,

Bao³

et al. 2013

Journal of Applied Physics

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Contact electrification by collisions of homogenous particles is investigated by two-particle collision experiments, which reveals the relation between electrification and the diameter ratio and relative colliding velocity of the two particles. Then, based on researches reported by Grzybowski's research group, a statistical model to compute the net charge of electrified particle after a single collision and multiple collisions are established, respectively. The model shows the net charge carried by the electrified particles depends on the difference between the two surfaces’ areas involved in collision contact and gives results in good agreement with our experiment results.

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Section: Contact Electrification Modeling and Discussionmentioning

confidence: 99%

Contact electrification by collision of homogenous particles

Xie¹,

G.²,

Bao³

et al. 2013

Journal of Applied Physics

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“…Della Volpe and Siboni proposed a different ratio suggesting water as acidic rather than amphoteric (Volpe and Siboni, 1997). Despite differing in absolute values, the acidity/basicity order is similar for both approaches (Clint and Dunstan, 2001). For IGC, the  + or  -values for the monopolar probes requires further validation, and the acid-base surface energy values for the solid surface only offers a description of the relative acid-base nature (Etzler, 2003;Ho and Heng, 2013).…”

Section: Surface Energy Analysismentioning

confidence: 99%

Effect of milling temperatures on surface area, surface energy and cohesion of pharmaceutical powders

Shah

Wang

Olusanmi

et al. 2015

International Journal of Pharmaceutics

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Particle bulk and surface properties are influenced by the powder processing routes. This study demonstrates the effect of milling temperatures on the particle surface properties, particularly surface energy and surface area, and ultimately on powder cohesion. An active pharmaceutical ingredient (API) of industrial relevance (brivanib alaninate, BA) was used to demonstrate the effect of two different, but most commonly used milling temperatures (cryogenic vs. ambient). The surface energy of powders milled at both cryogenic and room temperatures increased with increasing milling cycles. The increase in surface energy could be related to the generation of surface amorphous regions. Cohesion for both cryogenic and room temperature milled powders was measured and found to increase with increasing milling cycles. For cryogenic milling, BA had a surface area ∼ 5× higher than the one obtained at room temperature. This was due to the brittle nature of this compound at cryogenic temperature. By decoupling average contributions of surface area and surface energy on cohesion by salinization post-milling, the average contribution of surface energy on cohesion for powders milled at room temperature was 83% and 55% at cryogenic temperature.

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“…[7][8][9] The focus in this paper is on inorganic dielectric solids; however, the effect may also play a role in the electrification of organic polymers. In polymers, the effect may be more likely to occur in parallel with other mechanisms, e.g., charge transfer between charge patches on the surfaces, [10][11][12] from surface functional groups with acid/base character, 48 from charge transfer induced by strain, 49 or by material transfer. Finally, the results provide support for charge transfer by electrons rather than ions during many instances of triboelectric charging.…”

Section: Discussionmentioning

confidence: 99%

Tribo-electric charging of dielectric solids of identical composition

Angus

Greber

2018

Journal of Applied Physics

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Despite its long history and importance in many areas of science and technology, there is no agreement on the mechanisms responsible for tribo-electric charging, including especially the tribo-charging of chemically identical dielectric solids. Modeling of the excitation, diffusional transport, and de-excitation of electrons from hot spots shows that a difference in local surface roughness of otherwise identical solid dielectric objects leads to different transient excited electron concentrations during tribo-processes. The model predicts that excited electron concentrations are lower and concentration gradients higher in solids with rougher rather than smoother surfaces. Consequently, during contact, the flux of charge carriers (electrons or holes) from hot spots will be greater into the rougher solid than into the smoother solid. These predictions are in agreement with current and historical observations of tribo-electric charge transfer between solids of the same composition. This effect can take place in parallel with other processes and may also play a role in the charging of solids of different composition.

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Acid-base components of solid surfaces and the triboelectric series

Cited by 36 publications

References 9 publications

Contact electrification by collision of homogenous particles

Contact electrification by collision of homogenous particles

Effect of milling temperatures on surface area, surface energy and cohesion of pharmaceutical powders

Tribo-electric charging of dielectric solids of identical composition

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