Adsorption and micellar properties of a mixed system of nonionic–nonionic surfactants

Islam, Nazrul; Kato, Takeshi

doi:10.1016/j.jcis.2005.05.072

Cited by 12 publications

(8 citation statements)

References 49 publications

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“…It should be noted here that this conclusion cannot be drawn only from dynamic surface tension data. The conclusion on the existence of the LC state at high concentrations is in complete agreement with BAM studies. , …”

Section: Resultssupporting

confidence: 88%

“…The phase transition was observed in the Langmuir monolayer, while not observed in the Gibbs one. Although Kato et al also has reported the phase transition in the Gibbs films of C 12 E 1 at the air/water surface based on dynamic surface pressure and BAM images, their experiments were performed at various temperatures but with different concentrations. , So, in the present work, we studied this surface phase transition at constant temperature and different concentrations by different methods and from both equilibrium and dynamic points of view.…”

Section: Introductionmentioning

confidence: 94%

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Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

et al. 2006

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The surface conformational states of the Gibbs monolayer of ethylene glycol mono-n-dodecyl ether (C(12)E(1)) at the air/water interface was studied using dynamic surface tension, external reflection-absorption FT-IR spectroscopy (ERA FT-IR), and two-dimensional infrared (2D IR) correlation methods at constant temperature. The dynamic surface tensions were measured at different bulk concentrations of C(12)E(1), and it was observed that a constant surface tension region appears at approximately 38.5 mN m(-1) in a dynamic surface tension profile at concentrations higher than 11 micromol kg(-1). This constant surface tension region corresponds to the surface phase transition from liquid expanded (LE) to liquid condensed (LC). Two sets of ERA FT-IR spectra were collected, one at different bulk concentrations but after equilibrium time (equilibrium measurements) and another at constant bulk concentration (m = 16 micromol kg(-1)) but at different times (dynamic measurements). The first set of these measurements show that the peak area increases in the range of 11 < m < or = 16 micromol kg(-1), which means the increase in the number of surfactant molecules at the air/water interface. Also, the wavenumber of antisymmetric CH(2) stretching decreases gradually from approximately 2923 cm(-1) (for 10 and 11 micromol kg(-1)) to approximately 2918 cm(-1) (for m > or = 16 micromol kg(-1)) with increasing concentration. The wavenumbers of 2923 and 2918 cm(-1) were assigned to LE and LC phases, respectively, and the decrease of wavenumber in the concentration range of 11 < m < or = 16 micromol kg(-1) were correlated to the surface phase transition (LE --> LC), or in other words, in the mentioned concentration range, two phases coexist. The dynamic ERA FT-IR measurements at 16 micromol kg(-1) also confirm the surface phase transition from LE to LC. The 2D IR correlation method was applied to the both equilibrium and dynamic IR spectra of the C(12)E(1) monolayer. The synchronous correlation maps show two strong autopeaks at approximately 2922 and approximately 2851 cm(-1) and also show a strong correlation (cross-peaks) between antisymmetric CH(2) stretching (nu(a)) and symmetric CH(2) stretching (nu(s)). The asynchronous correlation maps show that both observed bands of nu(a) and nu(s) in one-dimensional IR split into two components with the characteristic of overlapped bands, which reveals the coexistence of two phases (LE and LC) at the interface at 11 < m < or = 16 micromol kg(-1). The synchronous and asynchronous maps that were obtained from dynamic IR spectra closely resembled the equilibrium map.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 94%

Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

et al. 2006

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“…Suresh et al [27] studied the phase behavior of myristic acid, and observed the formation of circular and fractal domains at lower and higher temperatures, respectively. In the case of both Langmuir [28,29] and Gibbs monolayers [15,16] we also have observed the formation of circular domains with internal stripes at lower temperatures, and fractal or fingering patterns at higher temperatures. The appearance of the fractal or fingering pattern in the condensed phases mentioned above has been ascribed to a decrease in line tension with increasing temperature, which tends to zero approaching the critical point [27].…”

Section: Introductionmentioning

confidence: 63%

Two-dimensional facets in Langmuir monolayers of 1-O-hexadecyl-rac-glycerol at the air–water interface

Islam

Kato

2006

Journal of Colloid and Interface Science

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“…The properties of the bulk solution, including micelle formation, have been the central concern and usually include the cmc, the interaction of mixed micelles, and the determination of micelle shape and size. 308,309 In addition, both the β M and β σ values are small and negative, also indicating that the surfactant mixtures behave almost ideally during monolayer and micelle formation. Further, the β M value was more negative than the β σ value, indicating a stronger interaction between the surfactant molecules during monolayer formation.…”

Section: Ideal Mixtures Of Homologous C N Eo M Surfactantsmentioning

confidence: 99%

“…Nonetheless, the interesting processes of micelles changing from spheres to rods is inadequately studied in C n EO m homologues mixed systems. 308,309…”

Section: N Eo M Interact With Sugar-based Nonionic Surfactantsmentioning

confidence: 99%

Complex Fluids of Poly(oxyethylene) Monoalkyl Ether Nonionic Surfactants

2010

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Adsorption and micellar properties of a mixed system of nonionic–nonionic surfactants

Cited by 12 publications

References 49 publications

Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

Two-dimensional facets in Langmuir monolayers of 1-O-hexadecyl-rac-glycerol at the air–water interface

Complex Fluids of Poly(oxyethylene) Monoalkyl Ether Nonionic Surfactants

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Adsorption and micellar properties of a mixed system of nonionic–nonionic surfactants

Cited by 12 publications

References 49 publications

Surface Phase Transition of C12E1 at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

Surface Phase Transition of C12E1 at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

Two-dimensional facets in Langmuir monolayers of 1-O-hexadecyl-rac-glycerol at the air–water interface

Complex Fluids of Poly(oxyethylene) Monoalkyl Ether Nonionic Surfactants

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Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods

Surface Phase Transition of C₁₂E₁ at the Air/Water Interface: A Study by Dynamic Surface Tension, External RA FT-IR, and 2D IR Correlation Methods