Phototribology: Control of Friction by Light.

Autor: Perotti BL; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil., Cammarata A; Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6 16627, Czech Republic., Cemin F; Laboratoire de Physique des Gaz et des Plasmas (LPGP), Université Paris-Saclay, CNRS, Orsay Cedex F-91405, France., Sales de Mello SR; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil., Leidens LM; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil., Echeverrigaray FG; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil., Minea T; Laboratoire de Physique des Gaz et des Plasmas (LPGP), Université Paris-Saclay, CNRS, Orsay Cedex F-91405, France., Alvarez F; Instituto de Física 'Gleb Wataghin' (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo 13083-970, Brazil., Michels AF; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil., Polcar T; Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6 16627, Czech Republic.; Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, U.K., Figueroa CA; Programa de Pós-Graduação em Engenharia e Ciência dos Materiais (PPGMAT), Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2021 Sep 15; Vol. 13 (36), pp. 43746-43754. Date of Electronic Publication: 2021 Sep 07.
DOI: 10.1021/acsami.1c13054
Abstrakt: In dry sliding, the coefficient of friction depends on the material pair and contact conditions. If the material and operating conditions remain unchanged, the coefficient of friction is constant. Obviously, we can tune friction by surface treatments, but it is a nonreversible process. Here, we report active control of friction forces on TiO 2 thin films under UV light. It is reversible and stable and can be tuned/controlled with the light wavelength. The analysis of atomic force microscopy signals by wavelet spectrograms reveals different mechanisms acting in the darkness and under UV. Ab initio simulations on UV light-exposed TiO 2 show a lower atomic orbital overlapping on the surface, which leads to a friction reduction of up to 60%. We suggest that photocontrol of friction is due to the modification of atomic orbital interactions from both surfaces at the sliding interface.
Databáze: MEDLINE
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