Denk, Patrick; El Maangar, Asmae; Lal, Jyotsana; Kleber, David; Zemb, Thomas; Kunz, Werner
The surfactant C(8)Eo(8)CH(2)COOH (Akypo LF2) and its salts have a small hydrophobic and a significantly longer hydrophilic part. As a consequence, there must be a significant steric constraint, once these surfactant molecules form micelles. In addition, the partially charged headgroups should bring some additional fine-tuning via electrostatic interactions to this “essentially non-ionic” surfactant.Experiments: Phase diagrams of binary mixtures of water and C(8)Eo(8)CH(2)COOH are established over large concentration and temperature ranges, also at different pHs and in the presence of sodium and calcium ions. Surface tensions and osmotic pressures are measured to understand the systems. To evaluate the microstructures, also Dynamic Light Scattering and Small-Angle X-ray Scattering are performed.