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Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface: [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB)

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Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface : [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB). / Purcell, Simon M.; Tesa-Serrate, Maria A.; Marshall, Brooks C.; Bruce, Duncan W.; D'Andrea, Lucía; Costen, Matthew L.; Slattery, John M.; Smoll, Eric J.; Minton, Timothy K.; McKendrick, Kenneth G.

In: Langmuir, Vol. 32, No. 39, 04.10.2016, p. 9938-9949.

Research output: Contribution to journalArticle

Harvard

Purcell, SM, Tesa-Serrate, MA, Marshall, BC, Bruce, DW, D'Andrea, L, Costen, ML, Slattery, JM, Smoll, EJ, Minton, TK & McKendrick, KG 2016, 'Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface: [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB)', Langmuir, vol. 32, no. 39, pp. 9938-9949. https://doi.org/10.1021/acs.langmuir.6b02440

APA

Purcell, S. M., Tesa-Serrate, M. A., Marshall, B. C., Bruce, D. W., D'Andrea, L., Costen, M. L., ... McKendrick, K. G. (2016). Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface: [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB). Langmuir, 32(39), 9938-9949. https://doi.org/10.1021/acs.langmuir.6b02440

Vancouver

Purcell SM, Tesa-Serrate MA, Marshall BC, Bruce DW, D'Andrea L, Costen ML et al. Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface: [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB). Langmuir. 2016 Oct 4;32(39):9938-9949. https://doi.org/10.1021/acs.langmuir.6b02440

Author

Purcell, Simon M. ; Tesa-Serrate, Maria A. ; Marshall, Brooks C. ; Bruce, Duncan W. ; D'Andrea, Lucía ; Costen, Matthew L. ; Slattery, John M. ; Smoll, Eric J. ; Minton, Timothy K. ; McKendrick, Kenneth G. / Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface : [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB). In: Langmuir. 2016 ; Vol. 32, No. 39. pp. 9938-9949.

Bibtex - Download

@article{525a69ce29664311a91cccd7f5f4ecdc,
title = "Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface: [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB)",
abstract = "Two complementary approaches were used to study the liquid-vacuum interface of the liquid-crystalline ionic liquid 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12mim][BF4]) in the smectic A (SmA) and isotropic phases. O atoms with two distinct incident translational energies were scattered from the surface of [C12mim][BF4]. Angle-dependent time-of-flight distributions and OH yields, respectively, were recorded from high- and low-energy O atoms. There were no significant changes in the measurements using either approach, nor the properties derived from them, accompanying the transition from the SmA to the isotropic phase. This indicates that the surface structure of [C12mim][BF4] remains essentially unchanged across the phase boundary, implying that the bulk order and surface structure are not strongly correlated for this material. This effect is ascribed to the strong propensity for the outer surfaces of ionic liquids to be dominated by alkyl chains, over an underlying layer rich in anions and cation head groups, whether or not the bulk material is a liquid crystal. In a comparative study, the OH yield from the surface of the liquid crystal, 8CB, was found to be affected by the bulk order, showing a surprising step increase at the SmA-nematic transition temperature, whose origin is the subject of speculation.",
author = "Purcell, {Simon M.} and Tesa-Serrate, {Maria A.} and Marshall, {Brooks C.} and Bruce, {Duncan W.} and Luc{\'i}a D'Andrea and Costen, {Matthew L.} and Slattery, {John M.} and Smoll, {Eric J.} and Minton, {Timothy K.} and McKendrick, {Kenneth G.}",
note = "{\circledC} 2016 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details",
year = "2016",
month = "10",
day = "4",
doi = "10.1021/acs.langmuir.6b02440",
language = "English",
volume = "32",
pages = "9938--9949",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "39",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Reactive-Atom Scattering from Liquid Crystals at the Liquid-Vacuum Interface

T2 - [C12mim][BF4] and 4-Cyano-4′-Octylbiphenyl (8CB)

AU - Purcell, Simon M.

AU - Tesa-Serrate, Maria A.

AU - Marshall, Brooks C.

AU - Bruce, Duncan W.

AU - D'Andrea, Lucía

AU - Costen, Matthew L.

AU - Slattery, John M.

AU - Smoll, Eric J.

AU - Minton, Timothy K.

AU - McKendrick, Kenneth G.

N1 - © 2016 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

PY - 2016/10/4

Y1 - 2016/10/4

N2 - Two complementary approaches were used to study the liquid-vacuum interface of the liquid-crystalline ionic liquid 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12mim][BF4]) in the smectic A (SmA) and isotropic phases. O atoms with two distinct incident translational energies were scattered from the surface of [C12mim][BF4]. Angle-dependent time-of-flight distributions and OH yields, respectively, were recorded from high- and low-energy O atoms. There were no significant changes in the measurements using either approach, nor the properties derived from them, accompanying the transition from the SmA to the isotropic phase. This indicates that the surface structure of [C12mim][BF4] remains essentially unchanged across the phase boundary, implying that the bulk order and surface structure are not strongly correlated for this material. This effect is ascribed to the strong propensity for the outer surfaces of ionic liquids to be dominated by alkyl chains, over an underlying layer rich in anions and cation head groups, whether or not the bulk material is a liquid crystal. In a comparative study, the OH yield from the surface of the liquid crystal, 8CB, was found to be affected by the bulk order, showing a surprising step increase at the SmA-nematic transition temperature, whose origin is the subject of speculation.

AB - Two complementary approaches were used to study the liquid-vacuum interface of the liquid-crystalline ionic liquid 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12mim][BF4]) in the smectic A (SmA) and isotropic phases. O atoms with two distinct incident translational energies were scattered from the surface of [C12mim][BF4]. Angle-dependent time-of-flight distributions and OH yields, respectively, were recorded from high- and low-energy O atoms. There were no significant changes in the measurements using either approach, nor the properties derived from them, accompanying the transition from the SmA to the isotropic phase. This indicates that the surface structure of [C12mim][BF4] remains essentially unchanged across the phase boundary, implying that the bulk order and surface structure are not strongly correlated for this material. This effect is ascribed to the strong propensity for the outer surfaces of ionic liquids to be dominated by alkyl chains, over an underlying layer rich in anions and cation head groups, whether or not the bulk material is a liquid crystal. In a comparative study, the OH yield from the surface of the liquid crystal, 8CB, was found to be affected by the bulk order, showing a surprising step increase at the SmA-nematic transition temperature, whose origin is the subject of speculation.

UR - http://www.scopus.com/inward/record.url?scp=84989817697&partnerID=8YFLogxK

U2 - 10.1021/acs.langmuir.6b02440

DO - 10.1021/acs.langmuir.6b02440

M3 - Article

VL - 32

SP - 9938

EP - 9949

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 39

ER -