title: Adsorption of polyelectrolytes and polyelectrolytes-surfactant mixtures at surfaces: a physico-chemical approach to a cosmetic challenge.
abstract: The use of polymer and polymer - surfactant mixtures for designing and developing textile and personal care cosmetic formulations is associated with various physico-chemical aspects, e.g. detergency and conditioning in the case of hair or wool, that determine their correct performances in preserving and improving the appearance and properties of the surface where they are applied. In this work, special attention is paid to the systems combining polycations and negatively charged surfactants. The paper introduces the hair surface and presents a comprehensive review of the adsorption properties of these systems at solid-water interfaces mimicking the negative charge and surface energy of hair. These model surfaces include mixtures of thiols that confer various charge densities to the surface. The kinetics and factors that govern the adsorption are discussed from the angle of those used in shampoos and conditioners developed by the cosmetic industry. Finally, systems able to adsorb onto negatively charged surfaces regardless of the anionic character are presented, opening new ways of depositing conditioning polymers onto keratin substrates such as hair.
authors: Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain.
authors: Sara
authors: S
authors: Llamas
authors: Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain; CNR-Istituto per l'Energetica e le Interfasi-U.O.S. Genova, Via de Marini 6, 16149-Genova, Italy.
authors: Eduardo
authors: E
authors: Guzmán
authors: Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain.
authors: Francisco
authors: F
authors: Ortega
authors: L'Oreal Research and Innovation, Aulnay-Sous Bois, France.
authors: Nawel
authors: N
authors: Baghdadli
authors: L'Oreal Research and Innovation, Aulnay-Sous Bois, France.
authors: Colette
authors: C
authors: Cazeneuve
authors: Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain. Electronic address: rgrubio@quim.ucm.es.
authors: Ramón G
authors: RG
authors: Rubio
authors: L'Oreal Research and Innovation, Aulnay-Sous Bois, France. Electronic address: gluengo@rd.loreal.com.
authors: Gustavo S
authors: GS
authors: Luengo
mesh_terms: D000327:Adsorption; D003358:Cosmetics / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry*; D006801:Humans; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D003358:Cosmetics; D004573:Electrolytes; D011108:Polymers; D013501:Surface-Active Agents
keywords: Cosmetic; Hair; Polymers; Surfaces; Surfactant