Controllable Friction of Green Ionic Liquids via Environmental Humidity

Document identifier: oai:DiVA.org:ltu-77681
Access full text here:10.1002/adem.201901253
Keyword: Engineering and Technology, Mechanical Engineering, Tribology (Interacting Surfaces including Friction, Lubrication and Wear), Teknik och teknologier, Maskinteknik, Tribologi (ytteknik omfattande friktion, nötning och smörjning), Friction control, Humidity, Ionic liquids, Viscosity, Machine Elements, Maskinelement
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 11 Sustainable cities and communitiesSDG 6 Clean water and sanitation
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Intelligent control of friction is an attractive but challenging topic. In this work, it is investigated if it would be possible to adjust friction in a lubricated contact by controlling environmental humidity. By exploiting the ability to adjust the environmental humidity by various saturated salt solutions, friction behavior of contacts lubricated with Choline l‐Proline ([Cho][Pro]) is modulated in a wide range of relative humidity (RH). The friction increases when the environmental humidity is increased and decreases when water is partially evaporated to a lower RH. It is thus possible to control friction by environmental humidity. The addition of water in ionic liquids (ILs) causes a decrease in viscosity, but as the tests are calculated to be performed in boundary lubrication the viscosity change is not the main factor for the change in friction. The friction sensitivity of RH can be explained by the effect of adhesion on the water uptake from humid air by [Cho][Pro]. Furthermore, the reversible changes of H‐bond types determined by the water content could be another explanation to the altered friction.

Authors

Jing Hua

Luleå tekniska universitet; Maskinelement
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Marcus Björling

Luleå tekniska universitet; Maskinelement
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Roland Larsson

Luleå tekniska universitet; Maskinelement
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Yijun Shi

Luleå tekniska universitet; Maskinelement
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