34839-10-6Relevant articles and documents
Synthesis and properties of dissymmetric gemini surfactants
Xu, Qun,Wang, Liyan,Xing, Fenglan
, p. 85 - 90 (2011)
A series of novel dissymmetric gemini cationics surfactants was synthesized by three-step reactions. The dissymmetric gemini surfactants contain a dodecanoic acid dimethylethylamine ester as the constant cationic part on one side of the hydroxypropyl center and a similar other cationic part, but with a different acid length (from octanoic to palmitic), on the other side. The critical micelle concentration (CMC) and the effectiveness of surface tension reduction (γ CMC) were determined. The surface tension measurements of dissymmetric gemini surfactants showed good water solubility, and low CMC had great efficiency in lowering the surface tension and a strong adsorption at the air/water interface. The CMC was observed to increase initially with the increase of the ester bond alkyl group. They also showed good foaming properties and wetting capabilites.
Retarding action of poly(amidoamine) dendrimers and cationic gemini surfactants in acrylic dyeing
Sadeghi-Kiakhani, Mousa,Tehrani-Bagha, Ali Reza
, p. 323 - 330 (2015/11/24)
Two cationic gemini surfactants and two generations of poly(amidoamine) (PAMAM) dendrimers (G = -0.5 and G = 0.5) were studied as retarders in acrylic dyeing with a cationic dye. Effects of retarder concentrations, dyeing time, and temperature were investigated by means of UV-Vis spectrophotometry. The results indicated that the dye adsorption decreased in the presence of the species and more uniform dyeing was achieved. The PAMAM dendrimers had lower retarding action than the cationic gemini surfactants which was attributed to their non-permanent and lower cationic charge density. Kinetics of the dyeing systems were also evaluated by four different empirical models. The modified Cegarra-Puente model fitted the dyeing kinetic data somewhat better than the other empirical kinetic models. Moreover, the activation energy of the dyeing systems was calculated and reported.
Thermal behavior of long-chain alkanoylcholine soaps
Tolentino, Ainhoa,Alla, Abdelilah,Martinez De Ilarduya, Antxon,Font-Bardia, Merce,Leon, Salvador,Munoz-Guerra, Sebastian
, p. 10738 - 10750 (2014/03/21)
Long-chain alkanoylcholines prepared from fatty acids (nACh) are fully sustainable cationic surfactants that are known for their biological and medicinal properties. In the present work the thermal behavior of the homologous series of alkanoylcholine iodides with n = 12, 14, 16 and 18, has been examined within the 25-200 °C range of temperatures. Up to three thermotropic phases have been identified, and the thermal transitions implied in their interconversion have been characterized by DSC and simultaneous WAXS and SAXS analysis carried out in real-time. All three phases consist of a bilayered structure with alkanoyl chains confined in the space between the head group layers and interdigitated to a greater or lesser extent. Melting-crystallization of either the polymethylene segments or the choline iodide groups is involved in such transitions. Additionally, a crystal phase consisting also of a bilayered structure but excluding side chain interdigitation was observed upon crystallization from solution and its structure was elucidated by single-crystal X-ray diffraction direct methods. The close correlation existing between thermal properties, phase structure and n has been brought into evidence.