Freezing transition of Langmuir-Gibbs alkane films on water

Sloutskin, Eli; Sapir, Zvi; Tamam, L.; Ocko, B. M.; Bain, Colin D.; Deutsch, Moshe

doi:10.1016/j.tsf.2006.12.007

Cited by 22 publications

(24 citation statements)

References 18 publications

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“…10 Subsequently, Sloutskin et al carried out surface tension and X-ray reflectivity measurements on mixed monolayers of CTAB and the series of n-alkanes and confirmed that the thickness of the surface frozen monolayers increased with n-alkane chain length for dodecane  heptadecane and found that the low-temperature phase was a hexagonally packed two-dimensional solid phase a single monolayer thick, with upright, conformationally ordered chains. 11,12 The structures of the surface frozen layer is similar to those observed for surface frozen monolayers at the airalkane 13 and airalcohol 14 interfaces. For pure linear alkanes, the surface freezing transition occurs between 16 and 50 carbons in length and the surface transition temperatures are up to 3 °C above the bulk melting point.…”

Section: Introductionsupporting

confidence: 67%

Effect of Surface Freezing on Stability of Oil-in-Water Emulsions

et al. 2018

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Penetration of alkane molecules into the adsorbed film of a cationic surfactant gives rise to a surface freezing transition at the alkane-water interface upon cooling. In this paper, we show that surface freezing of hexadecyltrimethylammonium chloride (CTAC) at the tetradecane-water interface stabilizes oil-in-water (OW) emulsions. For concentrations of CTAC near the critical micelle concentration, an OW emulsion coalesced readily above the surface freezing transition whereas the OW emulsion was stable in the surface frozen state. There was a discontinuous change in the stability of the OW emulsion at a temperature very close to the surface phase transition temperature as determined by interfacial tensiometry and ellipsometry on a planar oil-water interface. The mechanical elasticity of the surface frozen layer opposes film drainage and density fluctuations that could lead to rupture and is the most likely cause of the enhanced emulsion stability.

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Section: Introductionsupporting

confidence: 67%

Effect of Surface Freezing on Stability of Oil-in-Water Emulsions

et al. 2018

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“…[3][4][5][6][7] Surface freezing has also been observed for mixed monolayers of surfactant with alkanes at the air/surfactant solution interface. 8,9 In contrast, no such ordered phase is observed at the alkane/water interface, 10 and in fact, most materials show the opposite behavior of surface melting, where the surfaces disorder much below the bulk T m . Because of the lack of any direct structural measurements of interfacial structure for the alkane/surfactant-water system, it is difficult to establish whether the ordered phase is crystalline and similar to that observed for the alkane/air or air/solution interface.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Interfacial Tension at the Oil/Surfactant−Water Interface

Prasad

Dhinojwala

2007

Langmuir

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We have used dynamic interfacial tension measurements to understand the structure of the ordered monolayer at the hexadecane/water interface induced by the presence of surfactant molecules. No abrupt changes in the interfacial tension (gamma) are observed during the expansion and contraction cycle below the interfacial ordering temperature (Ti) as observed for alkanes in contact with air. The lack of an abrupt change in gamma and the magnitude of this change during the expansion process indicate that the ordered phase may not be crystalline. The change in the interfacial tension is due to an increase in contact between water and hexadecane molecules and the disordering of the interfacial ordered layer. At low surfactant concentrations, the recovery of the interfacial tension is slower below Ti, suggesting that there is a critical surfactant concentration necessary to nucleate an ordered phase at the interface.

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“…The series of papers by Bain, Aratono, Deutch, Ocko and their collaborators[84][85][86][87][88] revealed the role of various factors in the interfacial phase transitions at oil-water interface and opened the door for studying their effect on the emulsion properties. Very comprehensive review on the progress in this area was published recently by H. Matsubara and M. Aratono…”

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confidence: 99%

Surface phase transitions in foams and emulsions

Denkov

Cholakova

2019

Current Opinion in Colloid & Interface Science

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Surface phase transitions in surfactant adsorption layers are known to affect the dynamic properties of foams and to induce surface nucleation in freezing emulsion drops. Recently, these transitions were found to play a role in several other phenomena, opening new opportunities for controlling foam and emulsion properties. This review presents a brief outlook of the emerging opportunities in this area. Three topics are emphasized: (1) The use of surfactant mixtures for inducing phase transitions on bubble surfaces in foams; (2) The peculiar properties of natural surfactants saponins which form extremely viscoelastic surface layers; and (3) The main phenomena in emulsions, for which the surface phase transitions areimportant. The overall conclusion from the reviewed literature is that surface phase transitions could be used as a powerful tool to control many foam and emulsion properties, but we need deeper understanding of the underlying phenomena to explore fully these opportunities.

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Freezing transition of Langmuir-Gibbs alkane films on water

Cited by 22 publications

References 18 publications

Effect of Surface Freezing on Stability of Oil-in-Water Emulsions

Effect of Surface Freezing on Stability of Oil-in-Water Emulsions

Dynamic Interfacial Tension at the Oil/Surfactant−Water Interface

Surface phase transitions in foams and emulsions

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