STRUCTURAL EFFECT ON THE ADSORPTION PROPERTIES OF AQUEOUS-SOLUTIONS OF STRAIGHT-CHAIN AND CYCLIC DODECYL SULFATES

The adsorption properties of aqueous solutions of sodium alkyl sulfate s and their oxyethylates have been studied systematically. The effect of defined structural changes on the adsorption parameter values calcu lated on the basis of Frumkin's surface equation of state has been dem onstrated. In particular, a comparison has been made between n-dodecyl and cyclododecyl as hydrophobic groups in sodium alkyl sulfate and it s ethers. The limiting areas obtained by surface tension measurements have been discussed on the basis of the crystal structure data of n-do decyl sulfate and theoretical calculations on the three-dimensional sh ape of selected conformers of cyclododecyl sulfate.