Surface Activity And Adsorption Of Some 268206Surfactants At Aqueous Air Interface At 268206Different Temperatures

The adsorption of a series of ethoxylated nonionic and anionic 268206surfactant molecules at aqueous air interface at different temperature 268206ranges 298 308 318 328 and 338K was studied. Different surface 268206parameters were evaluated from surface tension measurements at 268206different temperatures. The effectiveness of adsorption 261043max for all 268206nonionic and anionic surfactants was discussed with respect to their 268206hydrophilic and hydrophobic characters. Ethoxylated stearate had the 268206lowest effectiveness of adsorption at 298K comparing to other 268206nonioics. Minimum surface area per molecule Amin was calculated 268206which provides information on the degree of packing and orientation 268206of the adsorbed surfactant molecules. Amin decreased through 268206increasing the hydrophobicity. Also the effectiveness of surface 268206tension reduction 26960cmc was discussed concerning on surfactant 268206structures. The dependence of surface parameters 261043max and Amin on 268206temperatures was explained in details. For the most investigated 268206nonionic and anionic surfactants 26960cmc were slightly affected by 268206temperature.268206