The oscillating bubble method

Determination of Surface Dilational Viscosity Using the Oscillating Bubble Method

“…The integration of the pressure gradient within the bulk phase to various surface points yields the same value at the pressure transducer independent of the path. Therefore, the oscillating bubble measurements are related to the curvature and the homogeneous dilation rate of the adsorption layer at the bottom of the bubble (36). This simplification is the main advantage of a pressure measurement in comparison to a pure geometrical evaluation of the bubble motion.…”

“…The advantages and disadvantages of the different experimental methods are discussed elsewhere (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34). In recent years we have systematically investigated the surface dilational properties of surfactant solutions using our new oscillating bubble method (35)(36)(37)(38). With our experimental technique we can obtain the surface dilational modulus in the frequency range of 1 Hz ≤ f ≤ 500 Hz, while the frequency characteristics are influenced by various mechanisms.…”

Bubble Oscillations in a Closed Cell

“…Approximate equations follow from [11] and [12] when the observed region has a much shorter dimension than the wavelength (kr 1): [13] v ≈ −i p 0 ωρ a r 2 e i ωt . [14] Equations [13] and [14] coincide with the solution obtained for an incompressible liquid [6]- [7] by neglecting nonlinear terms.…”

“…The solution [13]- [14] has been used in papers dealing with the oscillating bubble technique (8,12). By using Eq.…”

“…There are various types of oscillating bubble (drop) measurements which have been recently reviewed in (12). The experimental schemes are defined by two features: (1) the place where the external perturbation is applied (either from the capillary side or from the cell side of the meniscus) and (2) the system response that is measured (the meniscus height, pressure in the compartment connected to the capillary, pressure in the cell, etc.).…”