Controlling Macroscopic Friction through Interfacial Siloxane Bonding.
Phys Rev Lett
; 131(22): 226201, 2023 Dec 01.
Article
em En
| MEDLINE
| ID: mdl-38101386
ABSTRACT
Controlling macroscopic friction is crucial for numerous natural and industrial applications, ranging from forecasting earthquakes to miniaturizing semiconductor devices, but predicting and manipulating friction phenomena remains a challenge due to the unknown relationship between nanoscale and macroscopic friction. Here, we show experimentally that dry friction at multiasperity Si-on-Si interfaces is dominated by the formation of interfacial siloxane (SiâOâSi) bonds, the density of which can be precisely regulated by exposing plasma-cleaned silicon surfaces to dry nitrogen. Our results show how the bond density can be used to quantitatively understand and control the macroscopic friction. Our findings establish a unique connection between the molecular scale at which adhesion occurs, and the friction coefficient that is the key macroscopic parameter for industrial and natural tribology challenges.
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MEDLINE
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En
Ano de publicação:
2023
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Article