Charge Segregation Depends on Particle Size in Triboelectrically Charged Granular Materials

Forward, Keith M.; Lacks, Daniel J.; Sankaran, R. Mohan

doi:10.1103/physrevlett.102.028001

Cited by 170 publications

(122 citation statements)

References 27 publications

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“…A possible reason is thought to be the adhesion of fine particles (<40 μm) to coarse particles, which eventually enhance the surface roughness of the coarse particles, similar to the effects of the pattern/ microstructure shown in Table 4. Except for the pure charge (density) analyses, triboelectric series analyses have also been given equal importance [64,70,71]. These experiments and simulations confirm the general trend that large particles tend to charge positively, while small particles tend to charge negatively.…”

Section: Particle Sizesupporting

confidence: 54%

“…These experiments and simulations confirm the general trend that large particles tend to charge positively, while small particles tend to charge negatively. The theory behind this trend can be summarized from the following several aspects [24,70]. D respectively, will lead to the collision fraction occurring between a large particle and a small particle LS f and give it the form of…”

Section: Particle Sizementioning

confidence: 99%

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Fundamental theories and basic principles of triboelectric effect: A review

2018

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Long-term observation of the triboelectric effect has not only proved the feasibility of many novel and useful tribo-devices (e.g., triboelectric nanogenerators), but also constantly motivated the exploration of its mysterious nature. In the pursuit of a comprehensive understanding of how the triboelectric process works, a more accurate description of the triboelectric effect and its related parameters and factors is urgently required. This review critically goes through the fundamental theories and basic principles governing the triboelectric process. By investigating the difference between each charging media, the electron, ion, and material transfer is discussed and the theoretical deduction in the past decades is provided. With the information from the triboelectric series, interesting phenomena including cyclic triboelectric sequence and asymmetric triboelectrification are precisely analyzed. Then, the interaction between the tribo-system and its operational environment is analyzed, and a fundamental description of its effects on the triboelectric process and results is summarized. In brief, this review is expected to provide a strong understanding of the triboelectric effect in a more rigorous mathematical and physical sense.

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Section: Particle Sizesupporting

confidence: 54%

Section: Particle Sizementioning

confidence: 99%

Fundamental theories and basic principles of triboelectric effect: A review

2018

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“…Forward et al (2009aForward et al ( , 2009b found, for particles of identical composition, that smaller grains tend to charge negatively and larger grains tend to charge positively. As discussed more extensively in Sect.…”

Section: Tribo-electric Current Generation J Tribomentioning

confidence: 99%

“…3, they argued that the mass-size dependency involves the collisional transfer of electrons trapped in defect-created meta-states upon contact or rubbing, with the net exchange of electrons statistically favouring the smaller grains due to their increase likelihood of defect region 'rubbing' with larger grains (see Fig. 3 in Forward et al 2009aForward et al , 2009b. In the centre of a convective feature, the grains become stratified in the upward flow of warm air.…”

Section: Tribo-electric Current Generation J Tribomentioning

confidence: 99%

Applications of Electrified Dust and Dust Devil Electrodynamics to Martian Atmospheric Electricity

et al. 2016

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Atmospheric transport and suspension of dust frequently brings electrification, which may be substantial. Electric fields of 10 kV m −1 to 100 kV m −1 have been observed at the surface beneath suspended dust in the terrestrial atmosphere, and some electrification has been observed to persist in dust at levels to 5 km, as well as in volcanic plumes. The interaction between individual particles which causes the electrification is incompletely understood, and multiple processes are thought to be acting. A variation in particle charge with particle size, and the effect of gravitational separation explains to, some extent, the charge structures observed in terrestrial dust storms. More extensive flow-based modelling demonstrates that bulk electric fields in excess of 10 kV m −1 can be obtained rapidly (in less than 10 s) from rotating dust systems (dust devils) and that terrestrial breakdown fields can be obtained. Modelled profiles of electrical conductivity in the Martian atmosphere suggest the possibility of dust electrification, and dust devils have been suggested as a mechanism of charge separation able to maintain current flow between one region of the atmosphere and another, through a global circuit. Fundamental new understanding of Martian atmospheric electricity will result from the ExoMars mission, which carries the DREAMS (Dust characterization, Risk Assessment, and Environment Analyser on the Martian Surface)-B R.G. Harrison

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“…2 The difficulties encountered in studies on charge accumulation mainly arise from a large number of factors influencing the process and measurements. These include powder physical properties such as particle size [5][6][7][8] and shape, surface roughness or crystallinity, 9 environmental conditions namely humidity and temperature, [10][11] as well as type of the surface that powder is in contact with. 10 In addition, factors controlling the interaction between the particles and contact surface itself, such as duration of contact, might affect the charge observed.…”

Section: Introductionmentioning

confidence: 99%

Novel Coupling of a Capacitive Probe with a Dynamic Vapor Sorption (DVS) Instrument for the Electrostatic Measurements of Powders

Biegaj

Kwek

Lukas

et al. 2016

Ind. Eng. Chem. Res.

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Powders may become electrostatically charged due to friction. This phenomenon may lead to unusual outcomes such as increased cohesion, adhesion and poor flow. It is still a challenge to investigate the electrostatic properties of powders due to restrictions associated with existing methods. The objective is to present a novel coupling method with the Dynamic Vapor Sorption (DVS) instrument using a capacitive probe to measure the electrostatic potential of powders. The critical factors affecting measurements are defined to aid experimental design. The method was tested with glass beads tribocharged after contact with stainless steel to assess the feasibility of the setup via analysis of the repeatability and reproducibility of the data generated. The results obtained show that electrostatic measurements can be performed with minimum noise interference, short equilibration time of 15 min and high reproducibility based on 19 measurements. Stability of experimental conditions of ±0.1 °C and ±0.2% RH is achieved.

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Charge Segregation Depends on Particle Size in Triboelectrically Charged Granular Materials

Cited by 170 publications

References 27 publications

Fundamental theories and basic principles of triboelectric effect: A review

Fundamental theories and basic principles of triboelectric effect: A review

Applications of Electrified Dust and Dust Devil Electrodynamics to Martian Atmospheric Electricity

Novel Coupling of a Capacitive Probe with a Dynamic Vapor Sorption (DVS) Instrument for the Electrostatic Measurements of Powders

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