Dependence of triboelectric charging behavior on material microstructure

Wang, Andrew E.; Gil, Phwey S.; Holonga, Moses; Yavuz, Zelal; Baytekin, H. Tarık; Sankaran, R. Mohan; Lacks, Daniel J.

doi:10.1103/physrevmaterials.1.035605

Cited by 39 publications

(37 citation statements)

References 45 publications

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“…Figure 6 shows the distribution of the X and Y components of the induced electric field, where the Z component distribution is similar to the X one. The presence of the electric field will induce charge transfer in the conductive electrodes as a direct result to contact electrification [9,25]. Also, The field distributions are shown to be consistent with the potential distribution in the sense that the field will exert a force on the charges to move from higher to lower potential zones.…”

Section: Electric Characteristicsmentioning

confidence: 69%

Atomistic Field Theory for contact electrification of dielectrics

Abdelaziz

Chen

Hieber

et al. 2018

Journal of Electrostatics

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The triboelectrification of conducting materials can be explained by electron transfer between different Fermi levels. However, triboelectrification in dielectrics is poorly understood. The surface dipole formations are shown to be caused by the contact-induced surface lattice deformations. An Atomistic Field Theory (AFT) based formulation is utilized to calculate the distribution of the polarization, electric and potential fields. The induced fields are considered as the driving force for charge transfer. The simulation results show that a MgO/BaTiO 3 tribopair can generate up to 104 V /cm 2 , which is comprable with the data in the published literature.

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Section: Electric Characteristicsmentioning

confidence: 69%

Atomistic Field Theory for contact electrification of dielectrics

Abdelaziz

Chen

Hieber

et al. 2018

Journal of Electrostatics

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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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“…(This helps explain why even the same polymers can be charged by tribo-contacts; it is because even identical polymers will have different material compositions at each depth, which account for the same material charge transfer [29].) Moreover, material transfer is possible if dynamical changes in the surfaces and tribological environments exist, because materials will tend toward a lower potential energy state and these dynamical changes can lead to the potential energy minimum shifts [53,54]. For example, one dynamical change (in quasistatic form) can be strain and its corresponding potential energy form (near the potential energy local maximum, i.e., the local energy barrier at interface) is…”

Section: (Nano-) Materialsmentioning

confidence: 99%

“…Different explanations and theories are provided to understand the electrification, among which pattern and geometry are believed to play a vital role. Wang et al [53] proved that the differences in the microstructure of chemically identical materials trigger distinct tribo-charging behavior. In this sense, as a strained surface will exhibit different microstructures due to voids and seams (which can be scaled from nano-to micrometers) and the different microstructures will trigger different surface potential energy minimum according to catastrophe theories [53,54], as shown in Fig.…”

Section: Microstructure/pattern/geometrymentioning

confidence: 99%

“…Wang et al [53] proved that the differences in the microstructure of chemically identical materials trigger distinct tribo-charging behavior. In this sense, as a strained surface will exhibit different microstructures due to voids and seams (which can be scaled from nano-to micrometers) and the different microstructures will trigger different surface potential energy minimum according to catastrophe theories [53,54], as shown in Fig. 5, the strained surface may exhibit different triboelectric behavior [20,53].…”

Section: Microstructure/pattern/geometrymentioning

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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Dependence of triboelectric charging behavior on material microstructure

Cited by 39 publications

References 45 publications

Atomistic Field Theory for contact electrification of dielectrics

Atomistic Field Theory for contact electrification of dielectrics

Tribo-electric charging of dielectric solids of identical composition

Fundamental theories and basic principles of triboelectric effect: A review

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