Thinning and thickening transitions of foam film induced by 2D liquid–solid phase transitions in surfactant–alkane mixed adsorbed films

Matsubara, Hiroki; Umezaki, T.; Funatsu, Tsuyoshi; Tanaka, Hiromasa; Ikeda, Norihiro; Aratono, Makoto

doi:10.1016/j.cis.2020.102206

Cited by 7 publications

(3 citation statements)

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“…Therefore, the difference in the α 2 values between these two curves indicates that the surface charge of adsorbed CTA + ions was more effectively shielded in the Stern layer in the surface solid film, and the compression of the electrical double layer occurred at the surface freezing transition. These findings support the thinning transition of foam film stabilized by the CTAB-tetradecane mixed adsorbed film, 15 in which the thickness of the foam film abruptly decreased from 40 to 15 nm at the surface freezing transition. In the last half of the paper, we will see how these counterion distribution changes affect the surface viscoelasticity of the mixed adsorbed films using SQELS measurements.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Applications of surface freezing mentioned above are mainly derived from the mechanical strength of the mixed adsorbed films. However, we recently found that the freezing transition at the air–water interface gives rise to a thinning transition of foam film, which indicates that the compression of the electrical double layers of surfactant counterions occurs at the surface freezing . Hence, to clarify the effect of surface freezing transition on the foamability and foam stability, it is crucial to evaluate the difference in the electrical double layer structure and counterion adsorption dynamics between the two surface phases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Freezing of a Cationic Surfactant and n-Alkane Mixed Adsorbed Film on Counterion Distribution and Surface Dilational Viscoelasticity Studied by Total Reflection XAFS and Surface Quasi-Elastic Light Scattering

et al. 2023

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When liquid alkane droplets are placed on a surfactant solution surface having a proper surface density, alkane molecules penetrated into the surfactant-adsorbed film to form a mixed monolayer. Such a mixed monolayer undergoes a thermal phase transition from two-dimensional liquid to solid monolayers upon cooling when surfactant tail and alkane have similar chain lengths. We applied the total-reflection XAFS spectroscopy and surface quasi-elastic light scattering to the mixed adsorbed film of cetyltrimethylammonium bromide and hexadecane to elucidate the impact on the surface phase transition on the counterion distribution of the mixed monolayer. The EXAFS analysis verified that a higher percentage of counter Br − ions were localized in the Stern layer than in the diffuse double layer in the surface solid film compared to the surface liquid film, which resulted in a reduction in the surface elasticity measured by the SQELS. The finding that the surface phase transition accompanies the change in the counterion distribution will be important to consider the future applications of the colloidal systems, in which the coexistence of a surfactant and alkane molecules is essential, such as foams and emulsions.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Surface Freezing of a Cationic Surfactant and n-Alkane Mixed Adsorbed Film on Counterion Distribution and Surface Dilational Viscoelasticity Studied by Total Reflection XAFS and Surface Quasi-Elastic Light Scattering

et al. 2023

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“…In the past, thickening acid, 8 foam acid, 9 diverting acid, [10][11][12][13] and others have been used to reduce the acid-rock reaction rate. [14][15][16] The high viscosity of thickening acid effectively reduces the diffusion rate of hydrogen ions to the rock surface, thus reducing the reaction rate of acid-rock. However, the secondary damage caused by the thickening acid is a problem, and it is difficult to pump it in and out, so its application is limited.…”

Section: Introductionmentioning

confidence: 99%