Abstract
The negligible vapor pressure and friction-reducing abilities of ionic liquids make them ideal candidates as green lubricants. Here we show that ethylammonium nitrate (EAN), a room-temperature ionic liquid, significantly alters energy dissipation between surfaces. Colloidal-probe atomic force microscopy was used to study nano-scale friction between silica, mica, alumina and teflon. Fundamental investigations in a model system imply that three friction regimes exist at low applied loads which correspond to structured EAN layers being sheared. The onset of the regimes is rate dependant and hydrodynamics play a dominant role. For industrially relevant material combinations in EAN, bringing the surfaces together quickly resulted in strong repulsive forces and eliminated attractive forces (electrostatic, capillary, van der Waals) and adhesion, responsible for stiction/wear in miniaturized devices. Moreover, at fast rates and high loads both the friction magnitude and the friction coefficient were decreased in EAN, compared to measurements in air and aqueous solutions.
| Original language | English |
|---|---|
| Publication status | Published - 2011 |
| Externally published | Yes |
| Event | 241st National Meeting and Exposition of the American-Chemical-Society - Anaheim, United States Duration: 27 Mar 2011 → 31 Mar 2011 |
Conference
| Conference | 241st National Meeting and Exposition of the American-Chemical-Society |
|---|---|
| Abbreviated title | ACS |
| Country | United States |
| City | Anaheim |
| Period | 27/03/11 → 31/03/11 |
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Nanotribology of protic ionic liquids : Green lubricants for micro-/nano-electromechanical devices. / Cranston, Emily D.; Werzer, Oliver; Álvarez, Rubén; Atkin, Rob; Rutland, Mark W.
2011. Abstract from 241st National Meeting and Exposition of the American-Chemical-Society, Anaheim, United States.Research output: Contribution to conference › Abstract
TY - CONF
T1 - Nanotribology of protic ionic liquids
T2 - Green lubricants for micro-/nano-electromechanical devices
AU - Cranston, Emily D.
AU - Werzer, Oliver
AU - Álvarez, Rubén
AU - Atkin, Rob
AU - Rutland, Mark W.
PY - 2011
Y1 - 2011
N2 - The negligible vapor pressure and friction-reducing abilities of ionic liquids make them ideal candidates as green lubricants. Here we show that ethylammonium nitrate (EAN), a room-temperature ionic liquid, significantly alters energy dissipation between surfaces. Colloidal-probe atomic force microscopy was used to study nano-scale friction between silica, mica, alumina and teflon. Fundamental investigations in a model system imply that three friction regimes exist at low applied loads which correspond to structured EAN layers being sheared. The onset of the regimes is rate dependant and hydrodynamics play a dominant role. For industrially relevant material combinations in EAN, bringing the surfaces together quickly resulted in strong repulsive forces and eliminated attractive forces (electrostatic, capillary, van der Waals) and adhesion, responsible for stiction/wear in miniaturized devices. Moreover, at fast rates and high loads both the friction magnitude and the friction coefficient were decreased in EAN, compared to measurements in air and aqueous solutions.
AB - The negligible vapor pressure and friction-reducing abilities of ionic liquids make them ideal candidates as green lubricants. Here we show that ethylammonium nitrate (EAN), a room-temperature ionic liquid, significantly alters energy dissipation between surfaces. Colloidal-probe atomic force microscopy was used to study nano-scale friction between silica, mica, alumina and teflon. Fundamental investigations in a model system imply that three friction regimes exist at low applied loads which correspond to structured EAN layers being sheared. The onset of the regimes is rate dependant and hydrodynamics play a dominant role. For industrially relevant material combinations in EAN, bringing the surfaces together quickly resulted in strong repulsive forces and eliminated attractive forces (electrostatic, capillary, van der Waals) and adhesion, responsible for stiction/wear in miniaturized devices. Moreover, at fast rates and high loads both the friction magnitude and the friction coefficient were decreased in EAN, compared to measurements in air and aqueous solutions.
UR - http://www.scopus.com/inward/record.url?scp=80051878835&partnerID=8YFLogxK
M3 - Abstract
ER -