Freezing transition of Langmuir-Gibbs alkane films on water

E. Sloutskin; Z. Sapir; L. Tamam; B. M. Ocko; C. D. Bain; M. Deutsch

doi:10.1016/j.tsf.2006.12.007

Freezing transition of Langmuir-Gibbs alkane films on water

E. Sloutskin, Z. Sapir, L. Tamam, B. M. Ocko, C. D. Bain, M. Deutsch

Department of Physics - at Bar-Ilan University

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

We show that adding CTAB (CTAB, hexadecyltrimethylammonium bromide) in sub-millimolar bulk concentrations to water reduces its surface tension (ST) to a level where spontaneous surface spreading of a monolayer of medium-sized alkane (C_nH_2n+2, 12 ≤ n ≤ 17) occurs. ST and X-ray reflectivity (XR) measurements are used to show that the quasi two-dimensional (2D) liquid monolayer can be driven through a reversible surface freezing phase transition upon cooling. Grazing incidence diffraction (GID) shows that the frozen monolayer is crystalline, hexagonally packed, with surface-normal molecules, and a crystalline coherence length of at least a few hundred Å, very similar to the structure of surface-frozen (SF) monolayers at the surface of similar-length alkane melts.

Original language	English
Pages (from-to)	5664-5668
Number of pages	5
Journal	Thin Solid Films
Volume	515
Issue number	14 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.tsf.2006.12.007
State	Published - 23 May 2007

Keywords

Gibbs
Langmuir film
Surface freezing
X-ray reflectivity

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10.1016/j.tsf.2006.12.007

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title = "Freezing transition of Langmuir-Gibbs alkane films on water",

abstract = "We show that adding CTAB (CTAB, hexadecyltrimethylammonium bromide) in sub-millimolar bulk concentrations to water reduces its surface tension (ST) to a level where spontaneous surface spreading of a monolayer of medium-sized alkane (CnH2n+2, 12 ≤ n ≤ 17) occurs. ST and X-ray reflectivity (XR) measurements are used to show that the quasi two-dimensional (2D) liquid monolayer can be driven through a reversible surface freezing phase transition upon cooling. Grazing incidence diffraction (GID) shows that the frozen monolayer is crystalline, hexagonally packed, with surface-normal molecules, and a crystalline coherence length of at least a few hundred {\AA}, very similar to the structure of surface-frozen (SF) monolayers at the surface of similar-length alkane melts.",

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AU - Sloutskin, E.

AU - Sapir, Z.

AU - Tamam, L.

AU - Ocko, B. M.

AU - Bain, C. D.

AU - Deutsch, M.

PY - 2007/5/23

Y1 - 2007/5/23

N2 - We show that adding CTAB (CTAB, hexadecyltrimethylammonium bromide) in sub-millimolar bulk concentrations to water reduces its surface tension (ST) to a level where spontaneous surface spreading of a monolayer of medium-sized alkane (CnH2n+2, 12 ≤ n ≤ 17) occurs. ST and X-ray reflectivity (XR) measurements are used to show that the quasi two-dimensional (2D) liquid monolayer can be driven through a reversible surface freezing phase transition upon cooling. Grazing incidence diffraction (GID) shows that the frozen monolayer is crystalline, hexagonally packed, with surface-normal molecules, and a crystalline coherence length of at least a few hundred Å, very similar to the structure of surface-frozen (SF) monolayers at the surface of similar-length alkane melts.

AB - We show that adding CTAB (CTAB, hexadecyltrimethylammonium bromide) in sub-millimolar bulk concentrations to water reduces its surface tension (ST) to a level where spontaneous surface spreading of a monolayer of medium-sized alkane (CnH2n+2, 12 ≤ n ≤ 17) occurs. ST and X-ray reflectivity (XR) measurements are used to show that the quasi two-dimensional (2D) liquid monolayer can be driven through a reversible surface freezing phase transition upon cooling. Grazing incidence diffraction (GID) shows that the frozen monolayer is crystalline, hexagonally packed, with surface-normal molecules, and a crystalline coherence length of at least a few hundred Å, very similar to the structure of surface-frozen (SF) monolayers at the surface of similar-length alkane melts.

KW - Gibbs

KW - Langmuir film

KW - Surface freezing

KW - X-ray reflectivity

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Freezing transition of Langmuir-Gibbs alkane films on water

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Keywords

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