Didodecyldimethyl ammonium bromide

Examples of other frequently used surfactants that able to form reversed micelles without the addition of cosurfactants are didodecyldimethyl ammonium bromide [17], do-decylammonium propionate, benzyldimethylhexadecyl ammonium chloride [18], lecithin [19], tetraethyleneglycol monododecylether (C12E4) [20], decaglycerol dioleate [21], do-decylpyridinium iodide [22], and sodium bis(2-ethylhexyl) phosphate [23],... 

Fig. 2.51 Forward and reverse square-wave voltammograms of myoglobin-didodecyldimethyl-ammonium bromide films on a basal plane pyrolytic graphite eleetrodes at 200 Hz frequency, 10 mV step height, and different pulse heights. Points are experimental data, and lines are best fits by nonlinear regression onto the Mareus model. Baekground eurrents are ineluded in experimental and eomputed data. T = 37.0 0.2 °C, and the supporting eleetrolyte is 20 mmol/L pH 6.0 phthalate buffer +180 mmol/L NaCl (reprinted from [78] with permission)...

Chemical/Physical. Zhang and Rusling (1993) evaluated the bicontinuous microemulsion of surfactant/oiPwater as a medium for the dechlorination of polychlorinated biphenyls by electrochemical catalytic reduction. The microemulsion (20 mL) contained didodecyldimethyl-ammonium bromide, dodecane, and water at concentrations of 21, 57, and 22 wt %, respectively. The catalyst used was zinc phthalocyanine (3.5 nM). When PCB-1232 (69 mg), the microemulsion and catalyst were subjected to an electrical current of mA/cm on 11.2 cm lead electrode for 12 h, a dechlorination yield of >99.8% was achieved. Reaction products included minor amounts of mono- and dichlorobiphenyls (0.01 mg), biphenyl, and reduced alkylbenzene derivatives. 

The rate at which the microemulsion droplets exchange the contents of their aqueous cores is another important transport variable. Exchange kinetics have been measured using fluorescence techniques. Dynamic fluorescence quenching has also been used to study micelle size. f The technique is, however, more useful as a tool to explore the exchange kinetics between microemulsion droplets. The systems studied were AOT or didodecyldimethyl ammonium bromide and water in propane up to 100°C and... 

Self-diffusion measurements using the NMR technique have also elucidated the matter of water structure in the pool up to 10-15 water molecules per — 03 group (when AOT is the surfactant) were shown to be structurally perturbed [42]. From self-diffusion NMR studies of AOT-induced w/o microemulsions, Maitra proposed several regions of bound water in the water pool domain [43]. The state of water in the pool for cationic surfactant-containing microemulsions (water/dodecyidimethyl ammonium bromide or didodecyldimethyl ammonium bromide/chloroform or cyclohexane) was examined by NMR self-diffusion studies at different [Fl20]/[amphiphile] ratios or rvalues. Three types of water molecules— bound, aggregated, and free—in various proportions have been envisaged [44]. 

Mocatta et al. explored the room temperature n- and p-type doping of InAs NCs with Cu or Ag by the addition of the corresponding metal salts dissolved in a mixture of toluene, dodecyl amine and didodecyldimethyl-ammonium bromide to ca. 4nm InAs NCs in toluene. " The Cu-doped InAs NCs showed a blue-shift in the absorption whereas Ag-doped InAs NCs exhibited a red-shift. The scanning txmnelling spectroscopy measurements of Ag-doped NCs confirmed the shift of the Fermi level towards the valence band (p-type) and the Fermi level of Cu-doped NC s were shifted towards the conduction band (n-type). 

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