Dodecyltrimethyl ammonium bromide

Minimum surface tension at a 1 1 cationic/anionic ratio has been observed in the system containing SDS and dodecyltrimethyl ammonium bromide (3). In addition, 1 1 association has been observed for with long-chain sulfonates (1,2). The... 

Cetyltrimethyl ammonium bromide (CTAB) dodecyltrimethyl ammonium bromide (DTAB) tetradecyltrimethyl ammonium bromide (TTAB) trioctyl-methyl ammonium chloride (TOMAC) N-benzyl-N-dodecyl-hf-bis(2-hy-droxy ethyl) ammonium chloride (BDBAC) cetyl pyridinimn chloride (CPC) quaternary ammonium salt with carbon atoms of R ranging from 8-10 (CHj Rj N+ CL) (Aliquat 336)... 

In this work we investigated the formation process of two different types of Zeogrids (ZG) in presence of cetyltrimethylammonium bromide (CTAB) and dodecyltrimethyl-ammonium bromide (DTAB), respectively. 

The novel synthesis method of AI-MCM-41, using tetraethoxysilane (TEOS) and sodium aluminate (NaAlOa) as Si and AI sources, was studied. Dodecyltrimethyl ammonium bromide was employed as template and the initial gel was hydrothermally treated at 100 C. The influence of reaction conditions such as surfactant/Si molar ratio and synthesis time have been evaluated. The samples showed well-defined X-ray diffraction patterns indicating a highly ordered structure of pore arrays. MCM framework was characterized by infrared analysis and a tentative assignment of bands was performed. Both XRD and FT-IR studies could be correlated and an optimal characterization of material could be reached. 

V- Hexagonal MCM- lattice 41 VOSO4 Fumed silica Dodecyltrimethyl ammonium bromide Hydrothermal synthesis 100 °C, 6-7 days in Teflon-hned autoclaves tumbled at 25 rpm Sayari, 1995 (57)... 

Taheri-Kafrani, A. Asgari-Mobarakeh, E. Bordbar, A.K. Haertle, T. Structure-function relationship of P-lactoglobulin in the presence of dodecyltrimethyl ammonium bromide. Colloid Surface B 2010, 75 (1), 268-274. 

Chang et al. incorporated hexadecylamine, dodecyltrimethyl ammonium bromide, and quaternary ammonium salt-modified MMT clays in PLA films at 0-10% [w/w) MMT levels, based on wet casting method, using Al,Al-dimethylacetamlde as a solvent. They observed that there was an optimal loading of organoclay [ 3-... 

Surprisingly, almost all the applied work in MLC to date appears to have involved only ionic micellar mobile phases composed of either anionic sodium dodecyl sulfate (SDS), or cationic hexadecyltrimethyl-ammonium bromide or chloride (CTAB or CTAC), and dodecyltrimethyl-ammonium bromide (DTAB). Reports on the use of unclmrg nonionic surfactants, such as Neodol 91-6 and polyoxyethylene(23) dodecanol (Brij 35) are exceptions. 

Phenoxy acid herbicides, sulfonyl ureas, quaternary ammonium derivatives (quats), and aryloxy propanoic acids are the main classes of compounds subjected to capillary zone electrophoresis (CZE). Triazines are also separated using nonaqueous CZE, while low pfCa characterized chlorotriazines require an ion-pair-like solubilization using cationic surfactants (tetradecylammonium bromide, dodecyltrimethyl-ammonium bromide). Chiral selectors are added in CZE for obtaining enantioselectivity. Chiral selectors used for herbicide enantiomeric discrimination are vancomycin, y-cyclodextrin, ethyl carbonate -cyclo-dextrin, cyclohexyl-alkyl-)S-D-maltoside, sulpropyl ether a-cyclodextrin, and hexakis(2,3-di-0-methyl)-a-cyclodextrin. 

FIGURE 12 Plots of Aobs lor the hydrolysis of p-nitrophenyl acetate (curves A), mono-p-nitrophenyl dodecanedioate (curves B), and p-nitrophenyl octanoate (curves C) versus (a) concentration of sodium dodecanoate at pH 9.59 = 0.1 and 50° and versus (b) concentration of n-dodecyltrimethyl ammonium bromide (LTAB) at pH 10.49 = 0.2 and 50°. Values of /(bbs lor the reaction of A with sodium laurate have been divided by 2.0 to bring the curve on scale. [From Monger, F. M., and Portnoy, C. E. (1967). J. Am. Chem. Soc. 89, 4698-4703.]... 

Durchschlag H, Zipper P Volume, Surface and Hytotion Properties of Proteins 19 Bering T -) Kettler E El Seoud OA, Pires PAR FTIR and H NMR Studies on the Structure of Water Solubilized by Reverse Aggregates of Dodecyltrimethyl-ammonium Bromide Didodecyl-dimethylammonium Bromide, and Their Mixtures in Organic Solvents 101... 

Abstract Viscosity, conductivity, and uln asound velocity measurements have been used to study shape transitions of micelles. Sodium dodecylsulfate, dode-cylammonium chloride, and dodecyltrimethyl-ammonium bromide all exhibit such transitions for 0.3 m aqueous solutions in the presence of 1-alcohols. The transition point is dependent upon the temperature and pressure, and on the alcohol chain length. The alcohols from hexanol upwards promote transitions to larger aggregates, the higher alcohols being the most efficient. At higher temperatures more alcohol must be added to induce shape transition. The same applies as the pressure is increased, but the effect of pressure is less pronounced. 

We have studied three model systems of five-component mixtures oil -water - surfactant - alcohol - salt. Three different ionic surfactants have been used dodecyltrimethyl ammonium bromide (DTAB), sodium dodecyl sulfate (SDS) and sodium hexadecyl benzene sulfonate (SHBS). The alcohol used was butanol its addition was necessary because the above surfactants alone could form microemulsions. The salt screened the electrostatic interactions between surfactant polar heads it reduced Cq In this way, a continuous structural evolution o/w - bicontinuous - w/o could be obtained by addition of salt. At each salinity, the size of the structural elements was the largest (maximum swelling Rq for droplets, bicontinuous structures) because the microemulsions coexisted with excess oil and/or water. 

It was reported that phosphoms in high-purity silicon could be determined down to a level of 0.01 ag/g, by converting P to molybdophosphate, followed by the formation of molybdophosphate-dodecyltrimethyl-ammonium bromide. Phosphoms was then indirectly quantified by analyzing Mo by isotope dilution-ICP-MS. 

Distearyidimethylammonium chloride, dodecyltrimethyl-ammonium bromide, cocoalky-dimethylbenzylammonium chloride, and an imidazolium compound... 

Okubo et al successfully achieved an aqueous microsuspension RTCP of MMA with NIS catalyst. The particle phase included MMA (8 M), CP-I (80mM), AIBN (lOmM), and NIS (ImM), as in the mentioned bulk polymerization (Table 7.1 (entry 11)). The water content was 90% with the use of a cationic surfactant, dodecyltrimethyl ammonium bromide. The polymerization smoothly proceeded and the conversion reached 93% for 2 h at 80 °C. The PDI was small (1.3-1.5) throughout the polymerization, demonstrating the successful polymerization in water continuous phase. 

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