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- W3025744586 abstract "Previous nanotribology measurements demonstrated that 2 mol % of the oil-miscible ionic liquid (IL) trihexyltetradecyl(phosphonium) bis(2,4,4-trimethylpentyl)phosphinate (P₆,₆,₆,₁₄ (ⁱC₈)₂PO₂) diluted in octane lubricated as effectively as pure IL. However, until now the structure and composition of the lubricating adsorbed layer, which is critical for lubrication, was unknown. Here, the unconfined structure of the IL adsorbed layer at the oil–silica interface has been studied using neutron reflectometry. Multiple neutron contrasts revealed an 8 A thick adsorbed layer, even at 60 and 80 °C. The ratio of cations and anions in the layer was investigated by synthesizing the IL with deuterated cations and measuring its reflectivity at the oil–silica interface. At 60 °C the layer was composed of 48 ± 6 mol % P₆,₆,₆,₁₄⁺ cations, 24 ± 2 mol % (ⁱC₈)₂PO₂– anions, and 28 ± 8 mol % octane, while at 80 °C the composition was 50 ± 2 mol % P₆,₆,₆,₁₄⁺, 28 ± 2 mol % (ⁱC₈)₂PO₂– anions, and 22 ± 2 mol % octane. These results reinforce the importance of the judicious selection of IL cations and anions for charged surfaces and support their use in high-temperature applications." @default.
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- W3025744586 date "2018-01-01" @default.
- W3025744586 modified "2023-09-25" @default.
- W3025744586 title "Ionic Liquid Adsorption at the Silica–Oil Interface Revealed by Neutron Reflectometry C" @default.
- W3025744586 hasPublicationYear "2018" @default.
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