Friction, tribochemistry and triboelectricity: recent progress and perspectives
Production of electricity by friction is well known but poorly understood, and is the source of electrostatic discharge causing serious accidents. Recent results are in agreement with one of the conflicting views on this problem, according to which triboelectricity in polymers is triggered by mechan...
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| Published in | RSC advances Vol. 4; no. 19; pp. 6428 - 64298 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2014
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| Online Access | Get full text |
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| Summary: | Production of electricity by friction is well known but poorly understood, and is the source of electrostatic discharge causing serious accidents. Recent results are in agreement with one of the conflicting views on this problem, according to which triboelectricity in polymers is triggered by mechanochemical and wear or mass transfer phenomena. These results also challenge the widely accepted paradigm of one-way charge transfer that is the basis of the triboelectric series. Experimental results from powerful analytical techniques coupled to surface charge mapping support the following hypothesis: charge-bearing species are ionic polymer fragments formed through mechanical action. Beyond this, the atmosphere participates through tribocharge build-up and dissipation due to reactive plasma formation and charge exchange at the gas-solid interface, mediated by adsorption of non-neutral water, or ion partition during water adsorption, as in hygroelectricity phenomena.
Mechanochemical reactions during polymer friction or contact produce ionic fragments distributed on positive and negative domains at both surfaces. |
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| Bibliography: | André Galembeck obtained BSc (Chemistry) and PhD degrees from the University of Campinas and in 1999 he joined the Universidade Federal de Pernambuco as an Associate Professor. The main focus of his research is in polymer-based nanostructured materials. Currently, he is a member of the Nanotechnology Consulting Committee and the General Director of the Research Institute (CETENE) of the Brazilian Ministry of Science, Technology and Innovation. Thiago A. L. Burgo received his BSc degree (Chemistry) from the State University of Maringá and his PhD from the University of Campinas (2013), working on the triboelectrification of dielectric polymers, where he identified charge carriers and showed for the first time their effects on friction coefficients. He joined the Argonne National Laboratory (Chicago - USA) as a postdoc, investigating the exchange of electric charge at metal-insulator interfaces during friction force fluctuations. His research interests include scanning probe microscopy, electrostatic adhesion, stream electricity and functional materials. Rubia F. Gouveia holds a Chemistry BSc (2003) from the State University of Maringá and she obtained MSc (2005) and PhD degrees (2010) from the University of Campinas, where she discovered that water vapour adsorption at the solid-gas interface modifies the solid surface potential due to water ion partition concurrent with adsorption. Her thesis received the "Casimiro Montenegro Award". She was a postdoc at King's College, London and later joined the National Nanotechnology Laboratory in Campinas. Her current research interests include topics of physical chemistry, electrostatics, surface science and microscopy. Lia Beraldo da Silveira Balestrin obtained her BSc from the University of Campinas, where she is currently a graduate student working in the area of triboelectrification. Her undergraduate research work contributed to showing the formation and properties of water carrying excess electric charge. Awards: "Lavoisier Award" for academic achievement (2012) from the São Paulo Chemistry Professional Board (CRQ-IV) and "2014 Joint Electrostatic Conference Student Paper Award" 2nd Place from the Electrostatic Society of America (2014). Cristiane A. Silva received a BSc degree (Chemistry) from the State University of Maringá, followed by MSc and PhD degrees from the University of Campinas, Brazil, studying coatings made from polymer and aluminium polyphosphate nanoparticles. She is now a composite materials specialist in the Brazilian Nanotechnology Laboratory. Fernando Galembeck FRSC obtained BSc and PhD degrees at the University of São Paulo and he was a postdoc in the Universities of Colorado and California, followed by a stay in Unilever Port Sunlight. He was in the faculty of USP and later became a Professor of Chemistry at the University of Campinas, working on colloids, surfaces, materials and nanotechnology while consulting with industry and advising funding agencies. He is the recipient of Álvaro Alberto and Anísio Teixeira Prizes, the two most important for Brazilian scientists and educators. He is the current Director of the National Nanotechnology Laboratory at Campinas. |
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/c4ra09604e |