Study on the distribution of binary mixed counterions in surfactant adsorbed films by total reflection XAFS measurements

Imai, Yoshiyuki; Li, H. H.; Takumi, Hiroki; Tanida, Hajime; Watanabe, Ichiro; Takiue, Takanori; Matsubara, Hiroki; Aratono, Makoto

doi:10.1016/j.jcis.2012.08.044

Cited by 10 publications

(4 citation statements)

References 47 publications

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“…One example is the multilayering of surfactant films at air−water interfaces. 9 Also, owing to the development of appropriate experimental techniques, microphase separation 10 and the preferential accumulation of specific counterions 11 have been identified in adsorbed films. Bonales et al demonstrated the existence of hexatic phases 12 and glass structures 13 as S phases for particle monolayers.…”

Section: ■ Introductionmentioning

confidence: 99%

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

Matsubara

Aratono

2018

Langmuir

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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.

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Section: ■ Introductionmentioning

confidence: 99%

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

Matsubara

Aratono

2018

Langmuir

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“…In this paper, we applied the total reflection XAFS (TR-XAFS) spectroscopy and surface quasi-elastic light scattering (SQELS) to the mixed adsorbed film of cetyltrimethylammonium bromide (CTAB) and n -hexadecane (C16). As we have shown previously, , the extended XAFS (EXAFS) analysis of bromide ions revealed the existence of two hydration structures of bromide ions: fully hydrated bromide ions distributed in the diffuse double layer (free Br) and partially dehydrated bromide ions bound to the headgroups of surfactant ions in the Stern layer (bound Br). Therefore, by using factor analysis of the EXAFS spectra, one can evaluate the counterion distribution in the electrical double layer as the fraction of Br ions in the different hydration states.…”

Section: Introductionmentioning

confidence: 55%

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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“…In the free Br state, Br À ions are assumed to be fully hydrated, and in the bound Br state, Br À ions are partially dehydrated and adsorbed onto the hydrophilic groups of surfactant ions at the surface. 35 It was observed that all of the Br À ions exist in a bound state at the air-water interface (Fig. 7(b)).…”

Section: Njc Papermentioning

confidence: 93%

Probing the self-aggregation behavior and counter ion distribution of a copper surfactant complex

et al. 2014

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Study on the distribution of binary mixed counterions in surfactant adsorbed films by total reflection XAFS measurements

Cited by 10 publications

References 47 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

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

Probing the self-aggregation behavior and counter ion distribution of a copper surfactant complex

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