| Full text | |
| Author(s): Show less - |
Perotti, Bruna L.
[1]
;
Cammarata, Antonio
[2]
;
Cemin, Felipe
[3, 4]
;
Sales de Mello, Saron R.
[3, 1]
;
Leidens, Leonardo M.
[1]
;
Echeverrigaray, Fernando G.
[3, 1]
;
Minea, Tiberiu
[4]
;
Alvarez, Fernando
[3]
;
Michels, Alexandre F.
[1]
;
Polcar, Tomas
[2, 5]
;
Figueroa, Carlos A.
[1]
Total Authors: 11
|
| Affiliation: | [1] Univ Caxias do Sul, Programa Posgrad Engn & Ciencia Mat PPGMAT, BR-95070560 Caxias Do Sul, RS - Brazil
[2] Czech Tech Univ, Dept Control Engn, Fac Elect Engn, Prague 16627 6 - Czech Republic
[3] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin IFGW, BR-13083970 Campinas, SP - Brazil
[4] Univ Paris Saclay, Lab Phys Gaz & Plasmas LPGP, CNRS, F-91405 Orsay - France
[5] Univ Southampton, Engn & Phys Sci, Southampton SO17 1BJ, Hants - England
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | ACS APPLIED MATERIALS & INTERFACES; v. 13, n. 36, p. 43746-43754, SEP 15 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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 TiO2 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 TiO2 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. (AU) | |
| FAPESP's process: | 19/00757-0 - Study and control of the crystalline orientations in MoS2/TiO2 and MoS2/TiO2:H heterojunctions and their effects on its physicochemical properties |
| Grantee: | Fernando Graniero Echeverrigaray |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/24461-0 - Study and synthesis of High Entropy Alloy (HEA) thin films |
| Grantee: | Felipe Cemin |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |