Didodecyldimethylammonium chloride

Didodecyldimethylammonium chloride (hydroxide) Dioctadecyldimethylammonium chloride Base dissociation constant in a micelle based on concentration as a mole ratio... 

The excimer fluorescence of pyrene and substituted pyrenes has been studied in naturaP and syntheticvesicles. The rate constant for electron transfer to pyrene absorbed in didodecyldimethylammonium chloride vesicles was studied by pulse radiolysis, and evaluation of these results suggests a vesicle diameter of 20 nm. Sonication gives rise to an aggregate of smaller dispersisity than does methanol injection. Irradiation of pyrene in dihexadecyl... 

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. 

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. 

Cationic nanoparticles can also be obtained with cationic surfactants by incorporation during preparation or by incubation in a cationic surfactant. Didodecyldimethylammonium bromide (DMAB), dodecyltri-methylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB), dimethyl(dioctyldodecyl)ammonium bromide (DODAB), benzyl-alkonium chloride and cetrimide are widely used as cationic surfactants for this purpose. PLGA nanoparticles which were coated with DMAB were developed for oral delivery of the anticancer drug paclitaxel. This formulation compared with intravenous administration of paclitaxel with cremo-phor showed an equivalent effect with a 50% lower dose of paclitaxel encapsulated in nanoparticles. ... 

Lin etal. [397] dissolved didodecyldimethylammonium bromide in toluene to obtain a micellar solution. An appropriate amount of gold chloride was dissolved in the micellar solution, and an aqueous solution of NaBH4 ([BH4 ]/[Au ]=3 1) added to it under vigorous stirring. In the process, gold colloids formed. The particles were of 6-7 nm size. 

Surfactants have recently been used as models for membranes. Didodecyl-dimethylammonium bromide aggregates extensively in aqueous solutions into stable bilayer structures which further form vesicles and lamellae. Single compartment bilayer dioctadecyldimethylammonium chloride vesicles entrap and retain a number of substrates. Similar aggregation occurs with anionic amphiphiles with two normal alkyl groups as the hydrophobic residue. The hydrolysis of esters catalysed by a hydrophobic imidazole derivative occurs faster (up to 20-fold) in the intravesicle compared with the intervesicle reaction with didodecyldimethylammonium bromide. ... 

Many amphiphiUc substances are able to form reversed micelles. Certainly, the most studied is sodium bis (2-ethylhexyl) sulfosuccinate (AOT) [6]. From this salt, other interesting surfactants able to form reversed micelles have been derived by simply changing the counterion [7]. Other frequently used surfactants are didodecyldimethylammonium bromide [8], benzyldimethylhexadecylam-monium chloride, lecithin [9], tetraethylene glycol monododecyl ether (C12E4) [10], decaglycerol dioleate [11], and dodecylpyridinium iodide [12],... 

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