A Comparative Study of the Effect of Ready-Made andin Situ-Formed Surfactants on Interfacial Tension Measured by Drop Volume Tensiometry

Surface Pressure, Hysteresis, Interfacial Tension, and CMC of Four Sorbitan Monoesters at Water–Air, Water–Hexane, and Hexane–Air Interfaces

“…Interfacial tension and surface pressure techniques can be used to determine the interactions in the presence and the absence of different surface-active agents (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38). These measurements have appeared to be useful, for example, in preformulation studies on emulsifier films: the stronger the interfacial film, the more stable the resultant emulsion.…”

Effect of Neck Formation on the Measurement of Dynamic Interfacial Tension in a Drop Volume Tensiometer

“…Second, the hydrostatic pressure term shown in Table 1 are independent of flow rate, it can be concluded that can be assumed constant since the depth of immersion of the capillary hydrodynamic effects on drop formation can be neglected for the flow was not varied for the experiments in configuration B. Equation [ 5 ] can rates tested. When a neck is present, the force balance around a de-thus be simplified to give taching drop given in Eq.…”

“…P n consists of two d in Eq. [ 5 ] to give components: the excess pressure ᭝ P and the hydrostatic pressure P h .…”

“…When the interfacial tension is 18 mN m 01 , the corresponding Equation [ 5 ] may be used to obtain corrected values of interfacial tension drop volume is about 11 mL. Water drops of this size or less appear to from apparent ones if d n , b , and h are known.…”

“…[ 5 ] can be easily applied to dynamic interfacial tension data obtained from drops exhibiting neck formation. Based…”