Lattice Model for the Wetting Transition of Alkanes on Aqueous Surfactant Solutions

Matsubara, Hiroki; Aratono, Makoto; Wilkinson, Katherine M.; Bain, Colin D.

doi:10.1021/la052632a

Cited by 26 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the free energy of a monolayer at an air–water interface was calculated using 2D lattice theory. This 2D lattice has Γ m sites per unit area, which is equal to the total surface excess of surfactant and oil at saturation . Assuming that each interfacial site is occupied by surfactant and oil molecules with probability x s and x 0 , respectively, or that they can be empty with probability (1 – x s – x 0 ), the γ AW for the DTAB–hexadecane system is given by where γ 0 AW is the surface tension of pure water and m is the concentration of DTAB.…”

Section: Line Tensionmentioning

confidence: 99%

“…Therefore, it can be concluded for the above system that the 2D gas−liquid phase transition leads to a first-order transition from partial to pseudopartial wetting. We applied 2D lattice theory to the wetting transition, 23 revealing that the abrupt increase in surface density at the air− water interface upon the 2D gas−liquid phase transition stabilizes the interface against oil penetration. This is caused by the entropic gain as the result of the mixing of surfactant and oil molecules within the monolayer.…”

Section: ■ Wetting Transitionsmentioning

confidence: 99%

“…This 2D lattice has Γ m sites per unit area, which is equal to the total surface excess of surfactant and oil at saturation. 23 Assuming that each interfacial site is occupied by surfactant and oil molecules with probability x s and x 0 , respectively, or that they can be empty with probability (1 − x s − x 0 ), the γ AW for the DTAB−hexadecane system is given by…”

Section: ■ Line Tensionmentioning

confidence: 99%

See 2 more Smart Citations

Unique Interfacial Phenomena on Macroscopic and Colloidal Scales Induced by Two-Dimensional Phase Transitions

Matsubara

Aratono

2018

Langmuir

View full text Add to dashboard Cite

This feature article addresses a variety of unique macroscopic-scale and colloidal-scale interfacial phenomena, such as wetting transitions of oil droplets into molecularly thin films, spontaneous merging and splitting of oil droplets at air-water interfaces, solid monolayer and bilayer formation in mixed cationic surfactant/alkane adsorbed films, switching of foam-film thickness, and oil-in-water emulsion stability. All of these phenomena can be observed using commercial cationic surfactants, liquid alkanes, and water.

show abstract

Section: Line Tensionmentioning

confidence: 99%

Section: ■ Wetting Transitionsmentioning

confidence: 99%

Section: ■ Line Tensionmentioning

confidence: 99%

See 1 more Smart Citation

Unique Interfacial Phenomena on Macroscopic and Colloidal Scales Induced by Two-Dimensional Phase Transitions

Matsubara

Aratono

2018

Langmuir

View full text Add to dashboard Cite

show abstract

“…This is surely the reason why many groups dedicated work to this subject, for example. [1][2][3][4][5][6] The present work is closely linked to systematic studies of adsorption of alkanes from the gas phase on a water surface mainly pioneered by Pethica and co-workers. [7][8][9][10][11][12] Using modern methodologies like X-ray and neutron reflection the thickness of such adsorbed alkane layers was determined to be about 4-5 nm, 13 while Schlossman 14 discussed on the basis of X-ray data that the thickness of the transition region from alkane to water has a width of about 0.5 nm.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

et al. 2010

View full text Add to dashboard Cite

In this paper it is demonstrated that short chain alkanes (pentane, hexane, heptane, octane) can be adsorbed from a saturated vapour phase at the water-air interface. Measurements with the drop profile analysis tensiometry demonstrate that this molecular adsorption transfers into a condensation leading to a thin alkane film at the drop surface. At sufficient amounts, i.e. after such a film has reached a respective thickness, the condensed liquid starts to drain and an oil lens of alkane is formed at the water drop apex. The formation of such oil lenses is visually observed and leads to the situation that the obtained surface tensions are only effective values because the Laplace equation of capillarity does no longer describe the profile of the drop/oil lens. This is clearly demonstrated by the standard deviation of the profile fitting and the distribution of the deviation between experimental and calculated profile.

show abstract

“…Therefore, the spreading rates of the organic droplets decreased quickly at first and then slowed down. The spreading of the organic droplet results in the deformation of the organic droplet quickly from a sphere to a flat organic lens on the supporting fluid …”

Section: Discussionmentioning

confidence: 99%

Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane

et al. 2019

View full text Add to dashboard Cite

The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of gas bubbles to form a layer of the gas bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of gas bubbles. However, once the organic extractant starts to spread on the surface of gas bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the gas–water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the gas–water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable gas bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios.

show abstract

Lattice Model for the Wetting Transition of Alkanes on Aqueous Surfactant Solutions

Cited by 26 publications

References 15 publications

Unique Interfacial Phenomena on Macroscopic and Colloidal Scales Induced by Two-Dimensional Phase Transitions

Unique Interfacial Phenomena on Macroscopic and Colloidal Scales Induced by Two-Dimensional Phase Transitions

Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane

Contact Info

Product

Resources

About