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The deposition of oil drops on solid substrates from mixed solutions ofsurfactants and cationic polymer is investigated. The used anionic surfactantsare sodium laurylethersulfate (SLES) and sulfonated methyl esters (SME); thezwitterionic surfactant is cocamidopropyl betaine (CAPB). A new method, calledthe pressed drop method (PDM), was proposed to study the drop adhesion tosubstrates of different hydrophobicity. The PDM allows one to detect thepresence or absence of drop adhesion at different degrees of dilution of theinitial solution and, thus, to determine the threshold concentration of dropadhesion. The results show that the increase of the fraction of CAPB in themixture with the anionic surfactant suppresses the oil-drop deposition; SMEprovides easier drop adhesion than SLES; the addition of NaCl enhances, whereascoco-fatty-acid-monoethanolamide (CMEA) suppresses the drop deposition; no dropadhesion is observed in the absence of polymer. The drop-to-substrate adhesionis interpreted in terms of the acting surface forces: polymer bridgingattraction; hydrophobic attraction between segments of adsorbed polymer brushesand electrostatic forces. From viewpoint of applications, the PDM experimentsenable one to compare the performance of various components in personal careformulations and to optimize their composition with respect to the oil-dropdeposition.

Oil drop deposition on solid surfaces in mixed polymer-surfactant solutions in relation to hair- and skin-care applications