Dodecyltrimethylammonium chloride DTAC

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. 

Kelley and colleagues [389,390] used reverse micellar solutions to prepare M0S2 nanoclusters of tailored size. One of the systems was tridodecylmethylammonium iodide (TDAI)/hexanol/octane with dissolved M0CI4 in the micellar solution. Addition of H2S to the solution under rapid stirring yielded monodisperse sulfide particles of 3 nm diameter The particles were sulfur-rich, MoS with X > 2.0 and could be extracted into acetonitrile or octane - in the latter case, after addition of the necessary minimum of water. With addition of an aqueous solution of (NH4)2S, the nanocluster size increased to 4.5 nm. Another surfactant, used generally for obtaining 4.5 and 8 nm particles, was dodecyltrimethylammonium chloride (DTAC). The 4.5 nm particles were metastable and increased in size to -8 nm. 

Abstract Vibrational sum-frequency spectroscopy in conjunction with interfacial pressure measurements are used to provide the first direct spectroscopic information about the structure of amphiphillic molecules adsorbed to the interface between two immiscible liquids by total internal reflection sum-frequency vibrational spectroscopy (TIR SFVS). The effect of the ionic head group on the conformational order of sodium dodecyl sulfate (SDS), sodium dodecylsulfonate (DDS), dodecyltrimethylammonium chloride (DTAC), and dodecylamine hydrochloride (DAC) adsorbed at the D2O/CCI4 interface has been examined. In addition, the effect of the length of the alkyl chain on the conformation and orientation of sodium hexylsulfonate (HS), sodium undecylsulfonate (UDS), and sodium dodecylsulfonate (DDS) is also presented. SF vibrational spectra indicate the presence of gauche conformations in the hydrocarbon chains of all the surfactants examined. An increase in the surface coverage results in the reduction of gauche defects in the hydrocarbon chains as determined from the intensity ratio of the methyl to methylene symmetric... 

D2O (99%) and HPLC grade CCI4 were purchased from Aldrich. The CCI4 was distilled in order to remove any residual hydrocarbon compounds, and its purity confirmed by transmission FTIR. D2O was shaken with purified CCI4 prior to use and decanted. Sodium dodecyl sulfate (SDS) (Aldrich, 99.8%), Sodium dodecyl sulfonate (DDS) (TCI America, 99%), dodecyltrimethylammonium chloride (DTAC) (TCI America, 99%) and dodecylamine hydrochloride (DAC) (Kodak, 98%) were used as received. Sodium hexylsulfonate (HS) (TCI America, 99%), sodium undodecylsulfonate (UDS) (TCI America, 99%), and sodium dodecylsulfonate (DDS) (TCI America, 99%), were used as received. Dilauroylphosphocholine (DLPC), dimyristoylphosphocholine (DMPC), dipalmitoylphos-phocholine (DPC), and distearoylphosphocholine (DSPC) were purchased in powder form from Avanti Polar Lipids and used without any further purification. 

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. 

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... 

CTAC, CTAB cetyltrimethylammonium chloride, bromide HPC hexadecylpyridinium chloride TTAC, DTAC tetradecyltrimethyl ammonium chloride, dodecyltrimethylammonium chloride SDS sodium dodecylsulfate Triton X-100 polyoxyethylene (n = 9.5) isooctylphenylether. 

Polybutadiene was hydrogenated in biphasic ra-hexane/aqueous micellar solutions with a Rh/TPPTS catalyst under mild conditions (100°C, 2MPa Ha). The reaction rates were markedly influenced by the microstructure of the polymer and by the surfactants used (dodecyltrimethylammonium chloride, DTAG, or DTAC/Brij-35 mixtures). The catalyst was shown highly active and recyclable by phase separation (79). 

Average value obtained using 2,6-diphenyl-4-(2,4,6-triphenyl-l-pyridinio)phenoxide, 1-hexadecyl-4-[(oxocyclohexadienylidene)ethylidene]-l,4-dihydropyridine, l-hexadecyl-5-hydroxyquinoline and l-hexadecyl-6-hydroxyquinoline, average deviation <9 % calculated from [47d]. Abbreviations SDS = sodium dodecyl sulfate DBS = dodecyl benzenesulfonate CTAC = hexadecyltri-methylammonium chloride CTAB = hexadecyltrimethylammonium bromide DTAC = dodecyl-trimethylammonium chloride DTAB = dodecyltrimethylammonium bromide DHP = dihexadecyl phosphate DDDAB = didodecyldimethylammonium bromide DMPC = dimyristoylphosphati-dylcholine DPPC = dipalmitoylphosphatidylcholine POPC = l-palmitoyl-2-oleoylphosphati-dylcholine PCA = phosphatidic acid. 

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