Dodecyl trimethylammonium chloride

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. 

At an equal interfacial covering of surfactants the mass transfer of acetate is enhanced by a cationic surfactant (dodecyl trimethylammonium chloride, DTACl), unaffected by a nonionic surfactant (octylpolyethylene glycolether, TX100)io and slowed down by an anionic surfactant (sodium lauryl sulfate, NaLS sodiumdodecyl sulfate, NaDdS). This can be quantified when calculating the true interfacial concentrations, mpo,, in the electrochemical double layer with the Boltzmann equation ... 

Fig. 6. Comparison of experimental and model C - D order parameters (with respect to the local normal of the aggregate) for roughly spherical micelles at 40 °C. , results derived from T NMR relaxation measurements on dodecyl-trimethylammonium chloride (DOTAC) at 30 wtVo by Wal-derhaug et al. [3].---, model results assuming a spher-...

Ethoxylated methylcarboxylates Propoxyethoxy glyceryl sulfonate Alkylpropoxyethoxy sulfate as surfactant, xanthan, and a copolymer of acrylamide and sodium 2-acrylamido-2-methylpropane sulfonate Carboxymethylated ethoxylated surfactants (CME) Polyethylene oxide (PEG) as a sacrificial adsorbate Polyethylene glycols, propoxylated/ethoxylated alkyl sulfates Mixtures of sulfonates and nonionic alcohols Combination of lignosulfonates and fatty amines Alkyl xylene sulfonates, polyethoxylated alkyl phenols, octaethylene glycol mono n-decyl ether, and tetradecyl trimethyl ammonium chloride Anionic sodium dodecyl sulfate (SDS), cationic tetradecyl trimethyl ammonium chloride (TTAC), nonionic pentadecylethoxylated nonylphenol (NP-15), and nonionic octaethylene glycol N-dodecyl ether Dimethylalkylamine oxides as cosurfactants and viscosifiers (N-Dodecyl)trimethylammonium bromide Petrochemical sulfonate and propane sulfonate of an ethoxylated alcohol or phenol Petrochemical sulfonate and a-olefin sulfonate... 

Table 14.37 Solubilities of Pure Dodecyl- and Octadecyl-Trimethylammonium Chlorides in Grams per 100 Grams of Solvent (59)...

A number of molecular dynamics (MD) simulations of surfactant monolayers have been published during the last decade. In these studies, the water surface was often modelled as a flat, amorphous plane. Due to severe computer power restrictions, there have been only a few attempts in which the surface was modelled in all atomic details. Monolayers of trimethylammonium chloride at the air/water interface and the properties of tetradecyltrimethylammonium bromide monolayers have been simulated. In addition to these computer experiments, the structures of phenol, p-n-pentylphenol and A,V -diethyl-p-nitroaniline adsorbed on water have been investigated by MD simulations. Recently, molecular dynamics simulations of sodium dodecyl sulfate at the water/vapour and the water/CCU interfaces in regimes of small surface concentrations have been performed (4). 

Ionic surfactants, such as sodium dodecyl benzene sulphonate (NaDBS) or cetyl-trimethylammonium chloride (CTAQ), adsorb on hydrophobic particles of agrochemicals, as a result of the hydrophobic interaction between the alkyl group of the surfactant and the particle surface. As a result, the particle surface will acquire a charge that is compensated by counter ions (Na+ in the case of NaDBS and Cl in the case of CTACl), forming an electrical double layer. 

Surfactant cations are difficult to displace from the clay mineral surface. Quaternary alkylammonium ions are easier to exchange than primary alkylammonium ions. Primary alkylammonium ions are removed by hydrolysis into the amine in alkaline medium [47]. The mutual exchange of surfactants in non-aqueous dispersions was studied by Me Atee [48, 49], Solvent was a mixture of isooctane and isopropyl alcohol. The alcohol served two functions as a solvent for the surfactant chloride salts and the dispersing agent for the clay mineral surfactant particles. An effective agent to displace quaternary alkylammonium ions (dodecyl trimethylammonium ions) is paraquat [50],... 

Sodium dodecyl sulphate. + Cetyl trimethylammonium chloride. t Sodium myristyl sulphate. Non-ionic surfactant with average composition of Ci2H2 5(0CH2CH2)230H. 

Kim, H.-U., Lim, K.-H. Sizes and structures of micelles of cationic octadecyl-trimethylammonium chloride and anionic ammonium dodecyl sulfate surfactants in aqueous solutions. Bull. Korean Ghem. Soc. 2004, 25(3), 382-388. 

Oxidation of terminal olefins to methyl ketones by aqueous palladium chloride and oxygen is very slow, but addition of micellar sodium lauryl sulphate increases the rate of formation of 2-octanone from 1-octene twentyfold at 50 °C. There is weaker catalysis by the non-ionic surfactant Brij-35 and inhibition by cationic surfactants. " Oxidation of diosphenol (35) in basic aqueous tetradecyltrimethylammonium chloride is faster and more effective than in water, giving a higher yield of (36). Two attempts at effecting the enantioselective reduction of aromatic ketones, one in micelles of R-dodecyl-dimethyl-a-phenylethylammonium bromide and the other in sodium cho-late micelles, both give optical yields of less than 2%. Rather more success was obtained in the catalysed oxidation of L-Dopa, 3,4-dihydroxyphenyI-alanine. In the presence of the Cu complex of N-lauroyl-L-histidine in cetyl-trimethylammonium bromide micelles reaction was 1.42 (pH 6.90, 30 °C) to... 

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