Fast dynamic interfacial tension measurements and dilational rheology of interfacial layers by using the capillary pressure technique

Adsorption of proteins at the solution/air interface influenced by added non-ionic surfactants at very low concentrations for both components. 1. Dodecyl dimethyl phospine oxide

“…The data obtained here by the buoyant bubble methods agree very well with the results measured in the short time with the capillary pressure tensiometry (oscillating drop and bubble analyzer ODBA described in [28]). For example, at a concentration of 10 −5 mmol/l BLG and 10 −2 mmol/l C 12 DMPO the surface tension values obtained from ODBA measurements are between 61 mN/m and 59 mN/m in a time range between 200 and 1600 s. From Fig.…”

Dynamics of drops — Formation, growth, oscillation, detachment, and coalescence

“…However, when the hydrodynamic contribution is significant it has to be estimated (experimentally or theoretically) and recalculated as γ = (P total − P hydro )/(2/r). The hydrodynamic pressure losses P hydro are a function of capillary tip size and capillary geometry, the flow path line through the pressure chamber, fluid properties and the applied flow rate [4,29]. Fig.…”

“…Therefore, measurements of the capillary pressure P provide an extra parameter for this purpose. This technique was developed for fast dynamic conditions starting from a basic design [5,26,27] for static or quasi-static conditions [1,3,4]. Fig.…”

“…Among different available experimental techniques, the most recently developed capillary pressure technique (CPT) [2][3][4][5] and profile analysis technique (PAT) [6][7][8][9] represent the leading edge of the experimental investigations on dynamics of single drops and bubbles. Furthermore, these techniques have also the potential to be applied to study the bubble/drop coalescence and splitting processes [10,11].…”

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

“…CPT provides in addition access to measure fast interfacial dynamic quantities as it was discussed by Javadi et al in [116]. In particular for interfaces between two immiscible liquids CPT allows producing data for adsorption times as short as about 10 ms [117]. For interfaces between two liquids of similar density or in microgravity, this methodology is anyway the method of choice [118], as it is the only one not based on gravity effects.…”