Thermal Friction Enhancement in Zwitterionic Monolayers.
Journal
The journal of physical chemistry. C, Nanomaterials and interfaces
ISSN: 1932-7447
Titre abrégé: J Phys Chem C Nanomater Interfaces
Pays: United States
ID NLM: 101299949
Informations de publication
Date de publication:
10 Feb 2022
10 Feb 2022
Historique:
received:
03
11
2021
revised:
19
01
2022
entrez:
18
2
2022
pubmed:
19
2
2022
medline:
19
2
2022
Statut:
ppublish
Résumé
We introduce a model for zwitterionic monolayers and investigate its tribological response to changes in applied load, sliding velocity, and temperature by means of molecular-dynamics simulations. The proposed model exhibits different regimes of motion depending on temperature and sliding velocity. We find a remarkable increase of friction with temperature, which we attribute to the formation and rupture of transient bonds between individual molecules of opposite sliding layers, triggered by the out-of-plane thermal fluctuations of the molecules' orientations. To highlight the effect of the molecular charges, we compare these results with analogous simulations for the charge-free system. These findings are expected to be relevant to nanoscale rheology and tribology experiments of locally-charged lubricated systems such as, e.g., experiments performed on zwitterionic monolayers, phospholipid micelles, or confined polymeric brushes in a surface force apparatus.
Identifiants
pubmed: 35178140
doi: 10.1021/acs.jpcc.1c09542
pmc: PMC8842320
doi:
Types de publication
Journal Article
Langues
eng
Pagination
2797-2805Informations de copyright
© 2022 The Authors. Published by American Chemical Society.
Déclaration de conflit d'intérêts
The authors declare no competing financial interest.
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