High-Frequency Surface Dynamics of Solutions of a Nonionic Surfactant

Earnshaw, J. C.; Nugent, C. P.; Lunkenheimer, Klaus

doi:10.1021/la950923l

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…The dilatational viscosities were also averaged and plotted (Figure ). Before averaging, the values fluctuated randomly with q about zero, as was found previously for nonionic surfactants . The values can be seen to be zero for all but the two higher concentrations, which agreed with our finding on re-analyzing the data constraining the dilatational viscosity to be zero.…”

Section: Resultssupporting

confidence: 90%

“…Before averaging, the values fluctuated randomly with q about zero, as was found previously for nonionic surfactants. 32 The values can be seen to be zero for all but the two higher concentrations, which agreed with our finding on re-analyzing the data constraining the dilatational viscosity to be zero. This found there was no change in the values of the other parameters except at the two higher concentrations, implying the dilatational viscosity is nonzero at these concentrations.…”

Section: Resultssupporting

confidence: 89%

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The Effect of Inhibition of Molecular Reorientation and the Resulting Consequences for the Dilatational Elastic Modulus

Earnshaw¹,

Grattan²,

Lunkenheimer

et al. 2000

J. Phys. Chem. B

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Surface light scattering investigations of the propagation of thermally excited capillary waves on the surface of a surfactant solution (triisopropylphosphine oxide) have been carried out. The surfactant had a specifically designed geometry, to eliminate the possibility of molecular reorientation in the absorption layer. The absence of such motions are demonstrated by the absence of any deviation in the dilatational elastic modulus from the value calculated from the equilibrium surface tension versus concentration isotherm, at concentrations appropriate to reorientation in ordinary surfactant adsorption layers.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

The Effect of Inhibition of Molecular Reorientation and the Resulting Consequences for the Dilatational Elastic Modulus

Earnshaw¹,

Grattan²,

Lunkenheimer

et al. 2000

J. Phys. Chem. B

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“…The pioneers of surface research like Traube, von Szyszkowski, Langmuir, , Rehbinder, Frumkin, Harkins, and others used these amphiphiles. These investigations cover the adsorbed layers' thermodynamic, − kinetic, − electric, ,,− ,,− optical, − and surface- rheological − …”

Section: Introductionmentioning

confidence: 99%

Adsorption Properties of Soluble, Surface-Chemically Puren-Alkanoic Acids at the Air/Water Interface and the Relationship to Insoluble Monolayer and Crystal Structure Properties

et al. 2003

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The adsorption properties of soluble, surface-chemically pure n-alkanoic acids at the air/water interface were investigated by evaluating equilibrium surface tension and surface potential versus concentration isotherms. There is no transition-like change in the adsorption isotherms of the n-alkanoic acids between n-pentanoic (C5) and n-undecanoic acid (C11). The isotherms are evaluated by the two-state approach to the adsorption equation and by the Gibbs equation. The nondissociated n-alkanoic acids' surface area demand per molecule adsorbed is not constant within the homologous series but decreases with increasing chain length until it approaches the (almost constant) value of the insoluble homologues. The limiting surface area demand per molecule adsorbed of the soluble n-alkanoic acids is compared with the corresponding data of the insoluble homologues obtained from surface pressure versus surface area isotherms as well as from crystal structure analyses. Standard free enthalpies of adsorption, limiting cross-sectional areas, and surface interaction parameters reveal a distinct effect of alternation within the homologous series. Interestingly, also the Henry constants are subject to the even/odd phenomenon. This is explained by the even and odd homologues' different surface arrangement of their terminal methyl groups with respect to the interface. The linear relationships describing the chain length dependences of the standard free enthalpy of adsorption and of the surface interaction parameter hold for chain lengths in the range 6 ≤ n C ≤ 11. n-Pentanoic acid has a somewhat different characteristic. Unlike the shorter chain homologues' adsorption, the adsorption of n-dodecanoic acid cannot be described by a monotonically proceeding process but seems to include also processes of association.

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“…Consequently, there is the possibility of eliciting some information regarding the behavior of polymers at fluid interfaces from a relatively inexpensive technique rather than recourse to neutron reflectivity. The technique used, surface quasi-elastic light scattering (SQELS), has been much applied to pure liquids and surfactant solutions, − but the application to polymeric films to any significant extent is only a recent development. Nonetheless, SQELS has been responsible for a new theoretical description of polymer modified capillary waves derived from a molecular viewpoint as opposed to the previous phenomenological descriptions …”

Section: Introductionmentioning

confidence: 99%

Surface Viscoelastic Properties of Spread Films of a Polysilylene−Poly(ethylene oxide) Multiblock Copolymer at the Air−Water Interface

et al. 2000

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The viscoelastic properties of a spread layer of a poly(ethylene oxide)-co-poly(methylphenylsilylene) alternating block copolymer at the air-water interface have been obtained by surface quasielastic light scattering over a range of surface concentrations at a fixed capillary wavenumber and as a function of wavenumber for two surface concentrations. The frequency and the damping for a fixed capillary wavenumber showed a maximum at a surface concentration of 0.8 mg m -2 , where resonance between the capillary and dilational waves of the surface film occurs. The surface viscoelastic parameters, i.e., surface tension, dilational modulus, and dilational viscosity, were obtained from the heterodyne correlation functions of the scattered light by direct spectral fitting. The surface tension obtained from light scattering data showed the same qualitative dependence on surface concentration as that from the surface pressure data; however, the light scattering values were somewhat larger, indicating the presence of relaxation processes. Attempts to determine the nature of the relaxation process were made by obtaining the surface viscoelastic parameters as a function of surface wavenumber at the surface concentration where resonance between the surface modes is evident. However, the frequency dependence of the surface moduli followed none of the expectations for simple models of the relaxation process. Close analysis of the capillary wave frequency and damping as a function of surface wavenumber indicated that capillary and dilational modes were mixed at the resonance condition. The possibility of a splay mode of aggregated silylene blocks contributing to surface wave dynamics has been discussed.

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High-Frequency Surface Dynamics of Solutions of a Nonionic Surfactant

Cited by 6 publications

References 16 publications

The Effect of Inhibition of Molecular Reorientation and the Resulting Consequences for the Dilatational Elastic Modulus

The Effect of Inhibition of Molecular Reorientation and the Resulting Consequences for the Dilatational Elastic Modulus

Adsorption Properties of Soluble, Surface-Chemically Puren-Alkanoic Acids at the Air/Water Interface and the Relationship to Insoluble Monolayer and Crystal Structure Properties

Surface Viscoelastic Properties of Spread Films of a Polysilylene−Poly(ethylene oxide) Multiblock Copolymer at the Air−Water Interface

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