Contact angles and transition regions in soap films

Abstract

Notes 4. Relative rate measurements of TMA-DMP with B2Hg at 9°under the same flow and pressure conditions as a set of the 25°runs indicate no substantial change in relative rates within the estimated experimental uncertainties. Kinetic AnalysisBecause of the nature of the data, relatively little insight can be gained into the mechanisms of these reactions. If one assumes that similar mechanisms hold for MP and DMP-a reasonable assumption in view of

Marginal regeneration of a mobile vertical free liquid film

“…( 1 )), the principles of their drainage still are not fully understood. Drainage has been studied extensively in the case of horizontal films (2-4); however, investigations of vertical films focused on Frankel's law for film formation ( 1,(5)(6)(7)(8), black films (9-21), bursting (22)(23)(24)(25), film contact angles (26)(27)(28)(29)(30)(31), and surface waves (32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42), the last subject being treated mainly theoretically. Only a few papers dealt with actual flow in free films (10,(43)(44)(45) and Plateau borders (46), but the physics of the main drainage mechanism for mobile films, viz., marginal regeneration (1, 7), remained unsolved.…”

Method for direct measurement of the film tension of black foam films at various capillary pressures

“…Some of them are actually methods for measurement of the contact angle [1][2][3][4], the film tension being calculated according to (1) with a surface tension value measured independently. The method [3] has been used by de Feijter and Vrij [5] for systematic detailed measurements of sodium dodecyl sulphate solutions. The measurement of the contact angle is very useful especially when the difference 20 -y is important.…”

Techniques in the Formation and Examination of “Black” Lipid Bilayer Membranes

“…It must be remembered that e is an extrapolated quantity and that the invocation of a hypothetical contact line requires that a line tension term should appear in the force equation (de Feijter and Vrij, 1972), although for the lipid films under discussion, the line tension is negligible. The determination of () for aqueous soap films has been extensively discussed during the past few years, and several methods are available (Mysels et al, 1966;Princen, 1968;Kolarov et aI., 1968;Prins, 1969;Clint et al, 1969;Princen and Frankel, 1971). In principle, these methods may also be applied to lipid films, but in fact only an interference technique comparable to that of Kolarov et al (1968) has so far been described Kruglyakov et al, 1972;Requena, 1974).…”