Dodecyltrimethyl ammonium

The determination of alkyltrimethyl ammonium compounds with the general formula RN (CH3)3X surfactant were performed using CF-FAB and ESI. The compounds examined were dodecyl-, tetradecyl-, and hexadecyl-trimethyl ammonium compounds dissolved in water. The product ion spectra of dodecyltrimethyl ammonium compound and its methyl-deuterated homologue were presented. The product ion at m/z 60 [(CH3)3NH]+of the non-deuterated compound at m/z 228 was the only ion that shifted after deuteration to m/z 69 [38],... 

Labelled [2H3]dodecyltrimethyl ammonium iodide ([2H3]Ci2TMAI) was synthesised as an internal standard for the quantitative determination of dodecyltrimethyl ammonium chloride (Ci2TMAC) in sewage and river water samples by using FAB-MS [117]. The synthesis of [2H3]Ci2TMAI involved the reaction of dimethylamino dodecane with deuterated methyl iodide (CD3I) in methanol. 

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)... 

The vast majority of miniemulsion polymerizations reported in the literature have been stabilized with anionic surfactants, probably because of the widespread application of anionic surfactants in macroemulsion polymerization, and due to their compatibility with neutral or anionic (acid) monomers and anionic initiators. However, Landfester and coworkers [70, 71] have used the cationic surfactants cetyltrimethyl ammonium bromide (CTAB) and cetyltri-methyl ammonium tartrate for the production of styrene miniemulsions. They report that these surfactants produce similar particle sizes to anionic surfactants used at the same levels. Bradley and Grieser [72] report the use of dodecyltrimethyl ammonium chloride for the miniemulsion polymerization of MMA and BA. 

Commercially available tetraethyl orthosilicate (TEOS), dodecyltrimethyl- ammonium chloride (DTMACl) and trimethylammonium hydroxide (TMAOH) were mixed in water and the solution was stirred for 4 h at room temperature. The composition of the gel mixture was Si DTMACl TMAOH H2O = 1 0.6 0.3 60. White precipitates were filtered and dried at 393 K. This as-synthesized powder was calcined at 903 K for 4 h to obtain MCM-41. The silica was stirred vigorously in toluene containing a monolayer equivalent amount (1.0 per 1 nm ) of [l-(2-aminoethyl)-3-aminopropyl]trimethoxysilane... 

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... 

Hayakawa, K. and J. C. Kwak (1982). Surfactant-polyelectrolyte interactions. 1. Binding of dodecyltrimethyl-ammonium ions by sodium dextransulfate and sodium poly(styrenesuffonate) in aqueous solution in the presence of sodium chloride. The Journal of Physical Chemistry 86(19) 3866-3870. 

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. 

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