Electrostatic charging due to separation of ions at interfaces: contact electrification of ionic electrets.

  title={Electrostatic charging due to separation of ions at interfaces: contact electrification of ionic electrets.},
  author={Logan S. McCarty and George M. Whitesides},
  journal={Angewandte Chemie},
  volume={47 12},
This Review discusses ionic electrets: their preparation, their mechanisms of formation, tools for their characterization, and their applications. An electret is a material that has a permanent, macroscopic electric field at its surface; this field can arise from a net orientation of polar groups in the material, or from a net, macroscopic electrostatic charge on the material. An ionic electret is a material that has a net electrostatic charge due to a difference in the number of cationic and… 

Electrostatic Charging Due to Separation of Ions at Interfaces: Contact Electrification of Ionic Electrets

This Review discusses ionic electrets: their preparation, their mechanisms of formation, tools for their characterization, and their applications. An electret is a material that has a permanent,

Effect of Surface Pre-Charging and Electric Field on the Contact Electrification between Liquid and Solid

: Contact electri fi cation at the solid − liquid interface is a ubiquitous phenomenon. In spite of the extensive studies about its origin, it remains di ffi cult to reveal the mechanism of charge

Patterns of electrostatic charge and discharge in contact electrification.

It is concluded that the transfer of ions between the contacting surfaces is the most common mechanism for charge separation when organic materials are involved, and this study demonstrates the wealth of quantitative information it can provide as a tool for studying the atomic/molecular mechanisms of contact electrification.

Contact de-electrification of electrostatically charged polymers.

This study describes a mechanism previously unreported in the context of contact electrification, "contact de-electrification", a process in which polymers charged to the same polarity discharge on contact, which appears to be general.

Selective discharge of electrostatic charges on electrets using a patterned hydrogel stamp.

A topographically patterned hydrogel stamp is used to expose electrets purposely and selectively to water for discharging, hence leaving the electrostatic charges in the noncontacted area to achieve high-resolution charge patterns; by applying “single electrode” electrochemical reductions in the charged area, the authors can also obtain a variety of metallic microor nanostructures on electrets.

The Charging Events in Contact-Separation Electrification

The mechanism of CE is refined, providing information for rethinking the conventional ranking of materials’ charging abilities, charge harvesting, and charge prevention, and a large contribution to tribocharge harvesting comes, in fact, from the electrostatic induction resulting from the generated CE charges.

Electron Transfer in Nanoscale Contact Electrification: Photon Excitation Effect

The results suggest that there exists a threshold photon energy for releasing the triboelectric charges from the surface, which is 4.1 eV, and a photoelectron emission model is proposed to describe light-induced charge decay on a dielectric surface.

Anomalous Charging Behavior of Inorganic Materials

Surface charge on materials is important due to its wide range of consequences and applications in many industries (e.g., semiconductor). One important parameter needed for the design of devices and



Ionic electrets: electrostatic charging of surfaces by transferring mobile ions upon contact.

The fabrication and characterization of ionic electrets-materials that bear a long-lived electrostatic charge because of an imbalance between the number of cationic and anionic charges are described.

Contact charging of organic materials: Ion vs. electron transfer

A selected number of papers that relate the charging behavior to electrochemistry and discuss the results reported in light of the transfer mechanisms are discussed.

Contact electrification of materials : The chemistry of ions on polymer surfaces

  • A. Diaz
  • Materials Science, Chemistry
  • 1998
Abstract This report summarizes some recent studies aimed at determining the role of ion transfer in contact charging in polymers. The studies were carried out using blends of polymers and ionomers

Contact electrification induced by monolayer modification of a surface and relation to acid–base interactions

ELECTRICAL charge separation following contact between two materials (contact electrification or the triboelectric effect) is well known to occur between different materials as a consequence of their

Fractional Electrification of Polar Polymers

IT does not appear that any single mechanism suffices to explain frictional electrification completely1,2. The electrolytic mechanism of charge transfer has been discussed by Freundlich3, but is

Direct observation of ion transfer in contact charging between a metal and a polymer

Triboelectric charging between metals and insulators is usually thought to involve electron transfer. Doping some polymers with a small amount of salt can significantly change their charging

A tool for studying contact electrification in systems comprising metals and insulating polymers.

An analytical system for in situ measurement of the charge that develops by contact electrification when a ferromagnetic sphere rolls on the surface of a polymer, which generates an internally consistent set of data that include the polarity and magnitude of charging for a homologous series of polymers that differ chemically in the pendant group on a polyethylene backbone.

A Bidirectional Acid-Base Charging Model for Triboelectrification: part 1. Theory

A model for charging of insulative materials has been developed which quantitatively links the surface chemistry of materials to their work functions, and to the triboelectric charge exchange charge

Molecular modeling of electron trapping in polymer insulators

The presence of space charge in the polymeric insulation of high-voltage cables is correlated with electric breakdown. There is a vast literature concerned with the experimental characterization of

Electrokinetic Measurements Reveal Interfacial Charge at Polymer Films Caused by Simple Electrolyte Ions

The interfacial charge on spin-coated films of poly(tetrafluoroethylene-co-2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole) (Teflon AF) was studied by streaming potential and streaming current