Wetting and freezing of hexadecane on an aqueous surfactant solution: Triple point in a 2-D film

H. Matsubara; E. Ohtomi; M. Aratono; Colin D. Bain

doi:10.1021/jp802108v

Wetting and freezing of hexadecane on an aqueous surfactant solution: Triple point in a 2-D film

H. Matsubara, E. Ohtomi, M. Aratono, Colin D. Bain

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

20 Citations (Scopus)

Abstract

Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D 'solid' phase. Evidence is presented to support the hypothesis that the liquid-solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3°C and DTAB concentration of 0.75 mmol kg^-1. The slopes of the three phase boundaries are analyzed thermodynamically.

Original language	English
Pages (from-to)	11664-11668
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	112
Issue number	37
DOIs	https://doi.org/10.1021/jp802108v
Publication status	Published - Sept 18 2008

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1021/jp802108v

Cite this

@article{2c4c358acf44427db0bb255f461d087a,

title = "Wetting and freezing of hexadecane on an aqueous surfactant solution: Triple point in a 2-D film",

abstract = "Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D 'solid' phase. Evidence is presented to support the hypothesis that the liquid-solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3°C and DTAB concentration of 0.75 mmol kg-1. The slopes of the three phase boundaries are analyzed thermodynamically.",

author = "H. Matsubara and E. Ohtomi and M. Aratono and Bain, {Colin D.}",

year = "2008",

month = sep,

day = "18",

doi = "10.1021/jp802108v",

language = "English",

volume = "112",

pages = "11664--11668",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society",

number = "37",

}

TY - JOUR

T1 - Wetting and freezing of hexadecane on an aqueous surfactant solution

T2 - Triple point in a 2-D film

AU - Matsubara, H.

AU - Ohtomi, E.

AU - Aratono, M.

AU - Bain, Colin D.

PY - 2008/9/18

Y1 - 2008/9/18

N2 - Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D 'solid' phase. Evidence is presented to support the hypothesis that the liquid-solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3°C and DTAB concentration of 0.75 mmol kg-1. The slopes of the three phase boundaries are analyzed thermodynamically.

AB - Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D 'solid' phase. Evidence is presented to support the hypothesis that the liquid-solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3°C and DTAB concentration of 0.75 mmol kg-1. The slopes of the three phase boundaries are analyzed thermodynamically.

UR - http://www.scopus.com/inward/record.url?scp=53049107734&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53049107734&partnerID=8YFLogxK

U2 - 10.1021/jp802108v

DO - 10.1021/jp802108v

M3 - Article

C2 - 18729394

AN - SCOPUS:53049107734

SN - 1520-6106

VL - 112

SP - 11664

EP - 11668

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 37

ER -

Wetting and freezing of hexadecane on an aqueous surfactant solution: Triple point in a 2-D film

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this