Liquid–polymer triboelectricity: chemical mechanisms in the contact electrification process

Sosa, Mariana D.; Ricci, María Luz Martínez; Missoni, Leandro Luis; Murgida, Daniel H.; Cánneva, Antonela; D’Accorso, Norma B.; Negri, R. Martı́n

doi:10.1039/d0sm00738b

Cited by 44 publications

(57 citation statements)

References 52 publications

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“…On hydrocarbon (TCPS)- or fluorocarbon (PFOTS)-functionalized surfaces, drops charge positively ( Figure 2 c, green: TCPS, purple: PFOTS). 7 , 8 , 10 − 12 , 14 , 18 − 20 Hydrocarbon (TCPS) surfaces charge lower, at an initial charge of ca. 0.5 nC, which saturates to ca.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Charge of Sliding Water Drops

Wong

Bista

et al. 2022

Langmuir

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When a water drop slides over a hydrophobic surface, it usually acquires a positive charge and deposits the negative countercharge on the surface. Although the electrification of solid surfaces induced after contact with a liquid is intensively studied, the actual mechanisms of charge separation, so-termed slide electrification, are still unclear. Here, slide electrification is studied by measuring the charge of a series of water drops sliding down inclined glass plates. The glass was coated with hydrophobic (hydrocarbon/fluorocarbon) and amine-terminated silanes. On hydrophobic surfaces, drops charge positively while the surfaces charge negatively. Hydrophobic surfaces coated with a mono-amine (3-aminopropyltriethyoxysilane) lead to negatively charged drops and positively charged surfaces. When coated with a multiamine ( N -(3-trimethoxysilylpropyl)diethylenetriamine), a gradual transition from positively to negatively charged drops is observed. We attribute this tunable drop charging to surface-directed ion transfer. Some of the protons accepted by the amine-functionalized surfaces (−NH 2 with H + acceptor) remain on the surface even after drop departure. These findings demonstrate the facile tunability of surface-controlled slide electrification.

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Section: Resultsmentioning

confidence: 99%

Tuning the Charge of Sliding Water Drops

Wong

Bista

et al. 2022

Langmuir

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“…Introduction.-Spontaneous charge-accumulation of moving drops is commonly observed in sliding (slide electrification) [1][2][3] , micropipetting [4], aerosolizing [5], bouncing [6][7][8][9][10][11] or squeezing [12] of drops. It is highly debated whether the source of this charging is electron [3,12,13] or ion transfer [14][15][16][17]. However, the electric double layer (EDL) is thought to play a key role; some of the charge from EDL is left behind on the surface as the contact line moves.…”

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confidence: 99%

Adaptive two capacitor model to describe slide electrification in moving water drops

Bista¹,

Stetten²,

Wong³

et al. 2022

Preprint

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Slide electrification is a spontaneous charge separation between a surface and a sliding drop. Here, we describe this effect in terms of a voltage generated at the three-phase contact line. This voltage moves charges between capacitors, one formed by the drop and one on the surface. By introducing an adaptation of the voltage upon water contact, we can model drop charge experiments on many surfaces, including more exotic ones with drop-rate dependent charge polarity. Thus, the adaptive two capacitor model enables new insights into the molecular details of the charge separation mechanism.

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“…Recently, Sosa et. al 42 showed that RH affects the charging of sliding drops only when RH >70%. Thus, we assume that relative humidity does not affect the charging process in this work.…”

Section: Discussionmentioning

confidence: 99%

“…We performed our experiments under lab ambient conditions, so we did not control RH (measured values were 30–40%). Recently, Sosa et al 42 showed that RH affects the charging of sliding drops only when RH > 70%. Thus, we assume that relative humidity does not affect the charging process in this work.…”

Section: Discussionmentioning

confidence: 99%