Dodecyltrimethylammonium chloride

A surfactant solution is a mixture of DTAC (dodecyltrimethylammonium chloride) and CPC (cetyl pyridinium chloride) the respective CMCs of the pure surfactants are 2 X lO M and 9 x IO M (Ref. 140). Make a plot of the CMC for mixtures of these surfactants versus the mole fraction of DTAC. 

Creme rinses are appHed to the hair after washing. Frequently used quaternaries in creme rinses are dodecyltrimethylammonium chloride [112-00-5] dimethyloctadecy1(pentaethoxy)ammonium chloride, benzyldimethyloctadecylammonium chloride [122-19-0] and dimethyldioctadecylammonium chloride... 

Dodecyltrimethylammonium chloride [112-00-5] M 263.9, m 246 (dec). Dissolved in MeOH, treated with active charcoal, filtered and dried in vacuo [Waldenburg J Phys Chem 88 1655 1984], or recrystd several times from 10% EtOH in acetone. Also repeatedly crystd from EtOH/ether or MeOH. [Celia et al. 7 Am Chem Soc 74 2062 7952.]... 

The mechanism and rate of reduction of nitroarenes by cluster rhodium/cobalt carbonyls under basic conditions and catalysed by dodecyltrimethylammonium chloride has been reported [13]. 

Dodecyltrimethylammonium chloride is rapidly mineralized in fresh water after an acclimation period, and the rate is faster following the second rather than the first addition of the quaternary ammonium compound. 

Dodecyltrimethylammonium chloride [112-00-5] M 263.9. Dissolved in MeOH, treated with active... 

Fig. 2.18. Phase diagram of the dodecyltrimethylammonium chloride-water system. F denotes isotropic solution phase, M normal hexagonal liquid crystal, N lamellar liquid crystal and C and C cubic liquid crystalline phases. (From Ref.84))...

Materials. Sodium dodecylsulfate (SDS) and fully deuterated sodium dodecylsulfate (SDS-d ) were obtained from Sigma and Cambridge Isotope Laboratories respectively, and used as received. The cationic surfactants, dodecyltrimethylammonium chloride (DTAC), dodecyltrimethylammonium bromide (DTAB), and didodecyldimethylammonium bromide (DDAB) were purchased from Eastman Kodak, and purified by repeated recrystallization from an ethanol/acetone solvent pair. Even so, a small amount of surface active impurity was observed in surface tension plots for DTAC. The tetradecyldimethylamine oxide (C14AO) was a commercial sample (Ammonyx MO) obtained from Stepan (Control No. 533-30027). This sample is primarily C14AO, but also contains other chain length components. Sodium chloride (NaCl) was obtained from EM Science and used as received. Water was purified by a three stage Bamstead water purification system. 

The rate of racemization of the ionic biphenyl 24 was found to be accelerated by sodium dodecyl sulfate and by sodium polystyrene sulfonate but was not appreciably affected by polydiallyldimethyl-ammonium bromide or dodecyltrimethylammonium chloride (Table 17). 

SDS sodium dodecyl sulfate HDTC1 hexadecyltrimethylammonium chloride HDTBr hexadecyltrimethylammonium bromide Brij 35 polyoxyethylene (23) lauryl ether DTAC dodecyltrimethylammonium chloride TTAC1 tetradecyltrimethylammonium chloride HDPB hexadecylpyridinium bromide KDC potassium decanoate SPFO sodium perfluorooctanoate KTC potassium tetradecanoate... 

The measuring cell which serves as a basis of the CFMIO method [3] can also be used in a stopped-flow mode by positioning of one or more observation channels perpendicular to the flow tube. This combined stopped-flow, continuous-flow method [5] was used to determine the effect of surface-active substances (sodium dodecyl sulfate or dodecyltrimethylammonium chloride) on electron-transfer reactions between metal complexes. 

A recent study has explored the potential of the ternary complex formed between a poly(p-cyclodextrin) (formed by polycondensation of p-cyclodextrin), a cationic surfactant (dodecyltrimethylammonium chloride), and a polyanion in water, to act as a delivery system for gene therapy,using a combination of viscometric and SANS studies as well as visual observations to determine the macroscopic and microscopic properties of the complexes. In the study, sodium dextran sulfate was used as a substitute for DNA. The potential advantages of the use of such ternary complexes over the more commonly investigated DNA-lipid or polymer complexes (lipoplexes and poly-plexes, respectively) include a high water solubility of the resulting complex (lipoplexes and polyplexes often... 

The reaction is catalyzed by a mixture of H4Ru4(CO),2 and Co2(CO)g (THF, 120 C, 24 hr, CT 9) (382). Under phase-transfer conditions, y-keto acids can be obtained from terminal alkynes, methyl iodide, carbon monoxide, and water using a 1 1 mixture of Co2(CO)8 and Ru3(CO),2 in a benzene-sodium hydroxide solution with dodecyltrimethylammonium chloride (200°C, 1 bar, the yield and catalytic turnover were not reported) (383) ... 

H. J. D. McManus, Y. S. Kang, and L. Kevan, Electron spin resonance, electron spin echo, and electron nuclear double resonance studies of the photoieduction yield of a series of alkylmethylviologens in sodium dodecyl sulfate and dodecyltrimethylammonium chloride micelles Effect of the alkyl chain length ofthe viologen, J. Phys. Chem. 96, 5622-5628 (1992). 

Relaxation rates of selectively deuterated dodecyltrimethylammonium chloride/water system in the micellar cubic phase have been studied by NMR spectroscopy at several frequencies down to 0.5 The results... 

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