Phototribology: control of friction by light
Phototribology: control of friction by light
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 TiO2thin 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 TiO2show 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.
ab initio simulation, friction force, lateral force microscopy, light, nanotribology, phototribology, TiO2
43746-43754
Perotti, Bruna L.
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Cammarata, Antonio
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Cemin, Felipe
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Sales de Mello, Saron R.
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Leidens, Leonardo M.
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Echeverrigaray, Fernando G.
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Minea, Tiberiu
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Alvarez, Fernando
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Michels, Alexandre F.
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Polcar, Tomas
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Figueroa, Carlos A.
dda701df-de72-471e-a921-f416821c4f38
15 September 2021
Perotti, Bruna L.
7255f170-4e25-42aa-8459-991f970537bd
Cammarata, Antonio
d9f02172-7364-4d80-a32b-03d2d7970257
Cemin, Felipe
bcc685ff-c9ee-4c0d-b068-98ed06e13a62
Sales de Mello, Saron R.
cbfe10ec-2b40-495c-8bd7-626188bba1ed
Leidens, Leonardo M.
534a0ab1-9d7e-4f1c-828f-0b534c76d25f
Echeverrigaray, Fernando G.
04b3c05b-fa67-4fc2-a50b-f273ac65313d
Minea, Tiberiu
c4106691-b3aa-493d-9324-b57e03390f66
Alvarez, Fernando
ec07e2a9-cdd2-46dc-86ae-ed19ed712ffb
Michels, Alexandre F.
a5dd7147-f1f5-412e-a70b-16aa9ef06a62
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Figueroa, Carlos A.
dda701df-de72-471e-a921-f416821c4f38
Perotti, Bruna L., Cammarata, Antonio, Cemin, Felipe, Sales de Mello, Saron R., Leidens, Leonardo M., Echeverrigaray, Fernando G., Minea, Tiberiu, Alvarez, Fernando, Michels, Alexandre F., Polcar, Tomas and Figueroa, Carlos A.
(2021)
Phototribology: control of friction by light.
ACS Applied Materials and Interfaces, 13 (36), .
(doi:10.1021/acsami.1c13054).
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 TiO2thin 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 TiO2show 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.
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More information
Accepted/In Press date: 20 August 2021
e-pub ahead of print date: 7 September 2021
Published date: 15 September 2021
Additional Information:
Funding Information:
This work was partially supported by The Royal Society – UK (award “Royal Society-Newton Advanced Fellowship” - NAF\R2\192108), the French National Center for Scientific Research (CNRS), the Brazilian National Council of Scientific and Technological Development (CNPq – projects: 233194/2014-2, 465423/2014-0, and 422372/2016-1), and Research Support Foundation of the State of Rio Grande do Sul (FAPERGS – projects: 17/2551-0001052-3 and 19/2551-0000656-0). F.C. and F.G.E. are FAPESP fellows (projects 2018/24461-0 and 2019/00757-0). B.L.P., S.R.S.M, and L.M.L. are CAPES fellows. C.A.F and F.A. are CNPq fellows. A.C. and T.P. acknowledge the support from the project ″Novel nanostructures for engineering applications″ No. CZ.02.1.01/0.0/0.0/16_026/0008396 and The Ministry of Education, Youth and Sports from the Large Infrastructures for Research, Experimental Development and Innovations project ″e-Infrastructure CZ – LM2018140″ and the use of VESTA software.
Keywords:
ab initio simulation, friction force, lateral force microscopy, light, nanotribology, phototribology, TiO2
Identifiers
Local EPrints ID: 485340
URI: http://eprints.soton.ac.uk/id/eprint/485340
ISSN: 1944-8244
PURE UUID: a6e74743-0807-4aea-8f5f-ea5fec5033a5
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Date deposited: 04 Dec 2023 17:51
Last modified: 16 Apr 2024 01:43
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Contributors
Author:
Bruna L. Perotti
Author:
Antonio Cammarata
Author:
Felipe Cemin
Author:
Saron R. Sales de Mello
Author:
Leonardo M. Leidens
Author:
Fernando G. Echeverrigaray
Author:
Tiberiu Minea
Author:
Fernando Alvarez
Author:
Alexandre F. Michels
Author:
Carlos A. Figueroa
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