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- W2021876350 abstract "A surface quasielastic light scattering (SQELS) and electrocapillary wave (ECW) study of a monolayer of 1-dodecanol, obtained by placing a reservoir drop of the alcohol on top of a water surface, has been carried out as a function of temperature at different wavevectors. This monolayer goes through a liquid−solid phase transition at 312.1 K, more than 14 K above the freezing of bulk 1-dodecanol. The fit of the SQELS spectra gives the frequency, ωc, and the temporal damping, Δωc, of thermally induced capillary waves. In all the temperature range ωc follows Kelvin-like behavior (i.e., ωc ∼ q3/2) leading to values of the apparent dynamic surface tension lower than the static ones. In addition the damping follows, Δωc ∼ q1.2-1.4 very far from the expected ∼q2 dispersion behavior. Both wave parameters show temperature trends compatible with the expected liquid−solid 2D phase transition at around 312 K. The expansion of the frequency range by using the ECW technique, shows that our experimental results cover the regions q ≤ qR ≤ q, where qR is the wavevector at which capillary-dilational resonance takes place. Within the classical elasto-hydrodynamic theory, our results can be accounted for if the dilational viscosity, κ, takes a negative sign. In these conditions mode mixing takes place for q ≥ qR. Alternatively the experimental results can be quantitatively explained with κ = 0 if an extra hydrodynamic coupling is included in the dispersion equation. From a physicochemical point of view this coupling may arise from the vicinity of the phase transition and/or molecular orientational effects promoted by the dilational wave. The small values of the dynamic elasticity, ε(ω), found in this work can be rationalized in terms of a monolayer−subsurface material transport, within the Lucassen−Van de Tempel model." @default.
- W2021876350 created "2016-06-24" @default.
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- W2021876350 date "2000-07-06" @default.
- W2021876350 modified "2023-10-01" @default.
- W2021876350 title "Viscoelastic Behavior of 1-Dodecanol Monolayers Undergoing a Liquid−Solid Phase Transition. A Surface Quasielastic Light Scattering Study" @default.
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- W2021876350 doi "https://doi.org/10.1021/la0001474" @default.
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