Adsorption of sodium bis(2-ethylhexyl) sulfosuccinate and wettability in polytetrafluoroethylene–solution–air system

Wettability alteration by novel betaines at polymer–aqueous solution interfaces

“…The variations of the contact angle values with the increasing concentration of 18C and 18S are presented in Figure 2 for PTFE and PMMA surfaces. Figure 2a clearly depicts that the dependency of contact angle with the logarithm of concentrations on the PTFE surface are different from other researchers' conclusions[12,18,19,31] : for 18C and 18S, the contact angle keep almost a constant value in a wide range of surfactant concentration even more than CMC of individual surfactant solution.Above 1×10 -4 mol/L, the contact angles of both 18C and 18S show rapid downward trend and the values of 18C are significantly lower than that of 18S. However, for the conventional surfactants, there is a decrease in contact angle with the increase in surfactant concentration until CMC of surfactant solution and above that it is almost constant.…”

“…Moreover, the variation tendency of W A for 18C and 18S has some distinctions with other surfactants. Harkot's group [12,13] reported that for cationic …”

“…For examples, Szymczyk et al [10 -11] reported that the adsorption of CTAB and CPyB mixtures at air-liquid is the same as that at PTFE-liquid but is considerably higher than that at PMMA-liquid interface; in addition, the interaction across PTFE-solution interface was Page 6 of 30 A c c e p t e d M a n u s c r i p t 4 largely of Lifshitz-van der Waals type. Harkot et al [12] showed that there was a linear relationship between adhesion tension and the surface tension of not only cationic but also anionic surfactants.…”

Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes

“…Zisman [29] showed that there is a linear relationship between the cos h and the surface tension for pure liquid and aqueous surfactant solutions. But, many other researchers have found that there is a linear relationship between c LG cos h (adhesional tension) and surface tension of aqueous solution, c LG for hydrophobic solids [28,[30][31][32]. They have also found that the slope of the straight line is À1, which implies a similar adsorption density at solid-liquid and air-liquid interfaces.…”

Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide

“…The interfacial chemistry created by adsorbed molecules of surfactants and the nature of the interfacial monolayers formed by these compounds determines the end-use properties of the materials in many different applications. Because of these reasons the adsorption has been studied largely [1][2][3][4][5] to determine the surfactant excess concentration at the interface (which is a measure of the extension of the interface covered by the surfactant), the orientation of the molecules at the interface, the efficiency and effectiveness of adsorption and energy changes in the system resulting from the adsorption. The most useful tools to study the surface phenomena in an aqueous system are changes of * Corresponding author.…”