Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 27, Pages 9321-9325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9027035
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Funding
- Grantin-Aid for Priority Area [20031017]
- International Center for Integrated Research and Advanced Education in Materials Science [B-09]
- Grants-in-Aid for Scientific Research [20031017] Funding Source: KAKEN
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A binary room-temperature ionic liquid (RTIL) composed of bis(pentafluoroethanesulfonyl)amide (C2C2N-) salts of tetraheptylammonium (THpA(+)) and N-tetradecylisoquinolinium (C(14)Iq(+)) undergoes a phase transition upon increasing the mole fraction of C(14)Iq(+) (x) in the bulk RTIL. The initial decrease with x of the interfacial tension (gamma) at the interface between water (W) and the binary RTIL reaches a break point at x similar or equal to 0.2 irrespective of the values of the phase-boundary potential. The surface tension at RTIL air interface and the conductivity of the binary RTIL Support that the break point at x = 0.2 at the RTIL vertical bar W interface is attributable to the change of the bulk property. However, unlike the micelle formation of a surfactant solution, a further increase in x gives rise to a further change in gamma. Whereas the phase transition at x = 0.2 does not depend on the applied potential (E) across the RTIL vertical bar W interface, the mode of the change in gamma at x > 0.2 strongly depends on E and the apparent deficit of C(14)Iq(+) at the interface is more pronounced when E is closer to the point of zero charge.
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