title: Effects of dioctadecyl dimethyl ammonium chloride on the rheological behavior of behenyl trimethyl ammonium chloride/1-hexadecanol/water ternary system.
abstract: The effects of dioctadecyl dimethyl ammonium chloride (DODAC) on the rheological properties of ternary systems consisting of behenyl trimethyl ammonium chloride (C22TAC), 1-hexadecanol (C16OH), and water are studied to improve the long-term stability and to establish the preparation method of cosmetic products. The basic ternary systems behave as solids at low stresses, due to the formation of lamella liquid crystals called alpha gel. The additions of DODAC to ternary systems cause the rupture of alpha gel structures and transformation to vesicles. The structures of molecular assemblies are confirmed through particle size distribution, differential scanning calorimetry, and freeze fracture electron microscopy. The vesicle structures formed in coexistence of single-chain surfactant and double-chain surfactant are highly stable. Because the quaternary systems are considered to be constructed by the mixtures of alpha gel and vesicles at the appropriate concentrations of DODAC, the rheology can be controlled by the structural balance between them.
authors.affiliation: Skin Care Products R&D Department, POLA Chemical Industries, Inc., Takashimadai 27-1, Kanagawa-ku, Yokohama 221-0833, Japan. h-akatsuka@pola.co.jp
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Akatsuka
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ohara
authors.forename: Yasufumi
authors.initials: Y
authors.lastname: Otsubo
mesh_terms: D005233:Fatty Alcohols / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D010316:Particle Size; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012212:Rheology; D013499:Surface Properties; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D005233:Fatty Alcohols; D005782:Gels; D000644:Quaternary Ammonium Compounds; C519926:behenyl trimethylammonium; D014867:Water; C015831:dimethyldioctadecylammonium; C005031:cetyl alcohol