Dynamic Surface Tension and Foaming Properties of Aqueous Polyoxyethylene n-Dodecyl Ether Solutions

Influence of Surfactant Structure on the Drainage of Nonionic Surfactant Foam Films

“…Each sample has a much narrower distribution of EO units and lower levels of unreacted alcohol than conventional ethoxylate prepared with an alkali catalyst. The EO distribution of analogous NREs were shown in our previous paper (8). The modified NRE8 (NRE8Et and NRE8Bu) were obtained by reaction with chloroethane and 1-chlorobutane, respectively, below their boiling points for several hours in the presence of KOH as a catalyst.…”

“…A plot of log (d␥ t /dt) max vs concentration gives an approximately straight line for every surfactant system, and the shorter the length of the hydrocarbon chain, the faster the adsorption. In our previous paper, the initial foamability, measured by the Ross and Miles test, was correlated with the value of (d␥ t /dt) max (8). Furthermore, a number of articles have reported about the foamability of aqueous POE alkyl ether solutions (11,29).…”

“…According to previous papers (7,8), dynamic surface tension (␥ t ) was measured using the maximum bubble pressure method, and the maximum rate of decrease in surface tension, (d␥ t /dt) max , was calculated using the dynamic surface tension data according to the treatment by Rosen et al (23). Thus, the dynamic surface tension, ␥ t , at a constant surfactant concentration can be represented by the relaxation function…”

Dynamic Surface Tension and Surface Dilatational Elasticity Properties of Mixed Surfactant/Protein Systems

“…Experiments have shown that the increase in foamability appears in parallel with the lowering of the dynamic surface tension but not the equilibrium surface tension, which is almost constant in the same concentration range 20,21) . Besides, the surface dilatational elasticity is considered to have a significant contribution to the foaming properties [22][23][24][25][26] . Therefore, the knowledge of interfacial dynamics is basic to an understanding of the properties and application of the system.…”

Stability Factors of Foam Film in Contrast to Fluctuation Induced by Humidity Reduction

“…The surface shear viscosity measurement was carried out FT-IR Measurement using an oscillation torsion pendulum method with a surface Fourier transform infrared ( FT-IR) spectrometer, System viscoelastimeter, Model SVR-A ( Kyowa Interface Science 2000 FT-IR ( Perkin Elmer Co.), was used to determine the Co.) ( 5,35). A teflon-coated disk (radius 5 cm) was contacted thickness of the foam films according to a similar method with the liquid surface and attached to a torsion wire.…”