Phase transition of a binary room-temperature ionic liquid composed of bis(pentafluoroethanesulfonyl)amide salts of tetraheptylammonium and N-tetradecylisoquinolinium and its surface properties at the ionic liquid|water interface

Ryoichi Ishimatsu, Yuki Kitazumi, Naoya Nishi, Takashi Kakiuchi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A binary room-temperature ionic liquid (RTIL) composed of bis(pentafluoroethanesulfonyl)amide (C2C2N-) salts of tetraheptylammonium (THpA+) and N-tetradecylisoquinolinium (C14Iq+) undergoes a phase transition upon increasing the mole fraction of C14Iq+ (x) in the bulk RTIL. The initial decrease with x of the interfacial tension (γ) at the interface between water (W) and the binary RTIL reaches a break point at x = 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|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 γ. Whereas the phase transition at x = 0.2 does not depend on the applied potential (E) across the RTIL|W interface, the mode of the change in γ at x > 0.2 strongly depends on E and the apparent deficit of C14Iq+ at the interface is more pronounced when E is closer to the point of zero charge.

Original languageEnglish
Pages (from-to)9321-9325
Number of pages5
JournalJournal of Physical Chemistry B
Volume113
Issue number27
DOIs
Publication statusPublished - Jul 9 2009
Externally publishedYes

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Ionic Liquids
Surface Properties
Phase Transition
Amides
Ionic liquids
surface properties
amides
Surface properties
Salts
Phase transitions
salts
Temperature
Water
room temperature
liquids
water
Surface Tension
Surface tension
interfacial tension
liquid air

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "Phase transition of a binary room-temperature ionic liquid composed of bis(pentafluoroethanesulfonyl)amide salts of tetraheptylammonium and N-tetradecylisoquinolinium and its surface properties at the ionic liquid|water interface",
abstract = "A binary room-temperature ionic liquid (RTIL) composed of bis(pentafluoroethanesulfonyl)amide (C2C2N-) salts of tetraheptylammonium (THpA+) and N-tetradecylisoquinolinium (C14Iq+) undergoes a phase transition upon increasing the mole fraction of C14Iq+ (x) in the bulk RTIL. The initial decrease with x of the interfacial tension (γ) at the interface between water (W) and the binary RTIL reaches a break point at x = 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|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 γ. Whereas the phase transition at x = 0.2 does not depend on the applied potential (E) across the RTIL|W interface, the mode of the change in γ at x > 0.2 strongly depends on E and the apparent deficit of C14Iq+ at the interface is more pronounced when E is closer to the point of zero charge.",
author = "Ryoichi Ishimatsu and Yuki Kitazumi and Naoya Nishi and Takashi Kakiuchi",
year = "2009",
month = "7",
day = "9",
doi = "10.1021/jp9027035",
language = "English",
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journal = "Journal of Physical Chemistry B Materials",
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T1 - Phase transition of a binary room-temperature ionic liquid composed of bis(pentafluoroethanesulfonyl)amide salts of tetraheptylammonium and N-tetradecylisoquinolinium and its surface properties at the ionic liquid|water interface

AU - Ishimatsu, Ryoichi

AU - Kitazumi, Yuki

AU - Nishi, Naoya

AU - Kakiuchi, Takashi

PY - 2009/7/9

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N2 - A binary room-temperature ionic liquid (RTIL) composed of bis(pentafluoroethanesulfonyl)amide (C2C2N-) salts of tetraheptylammonium (THpA+) and N-tetradecylisoquinolinium (C14Iq+) undergoes a phase transition upon increasing the mole fraction of C14Iq+ (x) in the bulk RTIL. The initial decrease with x of the interfacial tension (γ) at the interface between water (W) and the binary RTIL reaches a break point at x = 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|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 γ. Whereas the phase transition at x = 0.2 does not depend on the applied potential (E) across the RTIL|W interface, the mode of the change in γ at x > 0.2 strongly depends on E and the apparent deficit of C14Iq+ at the interface is more pronounced when E is closer to the point of zero charge.

AB - A binary room-temperature ionic liquid (RTIL) composed of bis(pentafluoroethanesulfonyl)amide (C2C2N-) salts of tetraheptylammonium (THpA+) and N-tetradecylisoquinolinium (C14Iq+) undergoes a phase transition upon increasing the mole fraction of C14Iq+ (x) in the bulk RTIL. The initial decrease with x of the interfacial tension (γ) at the interface between water (W) and the binary RTIL reaches a break point at x = 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|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 γ. Whereas the phase transition at x = 0.2 does not depend on the applied potential (E) across the RTIL|W interface, the mode of the change in γ at x > 0.2 strongly depends on E and the apparent deficit of C14Iq+ at the interface is more pronounced when E is closer to the point of zero charge.

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