Alkyltrimethylammonium chloride bromide

V- Hexagonal MCM- lattice 41 V0S04 5H20 Fumed silica Alkyltrimethylammonium chloride or bromide (Ci6H33)(C H2 +i)(CH3)2NBr, with n= 1-22 to control pore size 100 °C, 7 days Sayari, 1995 (57)... 

Na (K) -alkyl 1-sulfates or -sulfonates Na -alkane-1-sulfonates Na -alkane-l-sulfonates Na -alkane-l-sulfonates Na n-alkyl-1-sulfates Na -alkyl-l-sulfates Na n-alkyl-2-sulfates Na p- -alkylbenzene sulfonates Na p- -alkylbenzene sulfonates /i-Alkylammonium chlorides /i-Alkylammonium chlorides /i-Alkytrimethylammonium bromides /i-Alkyltrimethylammonium chlorides (in 0.1 M NaCl)... 

Figure 3.8 Variation of the residence time of surfactants in micelles with the carbon number m of the alkyl chain at 25°C for sodium alkylsulfates (A) sodium alkylsulfonates (0) sodium alkylcarboxy-lates ( ) potassium alkylcarboxylates ( ) alkylammonium chlorides (+) alkyltrimethylammonium chlorides (V) alkylpyridinium chlorides (0) alkylpyridinium bromides ( ) Adapted from Reference 84.

Alkyltrimethylammonium surfactants, such as hexadecyltrimethylammonium chloride (HTAC) [6, 9, 38-41], hexadecyltrimethylammonium hydroxide (HTAH) [38, 42], hexadecyltrimethylammonium bromide (HTAB) [43-46], te-tradecyltrimethylammonium bromide (TTAB) [47], pentadecyltriethylammon-... 

Formation of the Sic Phase in Binary Aqueous Alkyltrimethylam-monium Halide Solutions. These considerations are well illustrated by the formation of the Slc phase in aqueous alkyltrimethylammonium halide solutions (17) (Figure 7). This phase is apparently composed of Si micelles—probably on balance prolate—arranged in a primitive, cubic lattice and rotating fairly freely at the lattice points. The lattice is formed by dodecyl- and tetradecyltrimethylammonium chlorides but not by the hexadecyl or octadecyl chlorides nor by any of the corresponding bromides. This may be expressed as follows. 

Alkyltrimethylammonium bromides -Alkylammonium chlorides Alumina, Preparation Standardization a-Amino acids... 

Empirical Equations Many investigators have developed empirical equations relating the CMC to the various structural units in surface-active agents. Thus, for homologous straight-chain ionic surfactants (soaps, alkanesulfonates, alkyl sulfates, alkylammonium chlorides, alkyltrimethylammonium bromides) in aqueous medium, a relation between the CMC and the number of carbon atoms N in the hydrophobic chain was found (Klevens, 1953) in the form... 

Alkyltrimethylammonium salts (cetyl trimethylammonium bromide, cetyl trimethylammonium chloride), cetylpyridinium chloride, benzalkonium chloride, benzethonium chloride, 5-bromo-5-nitro-l,3-dioxane, dimethyldioctadecylammonium chloride, cetrimonium bromide, dioctadecyldimethylammonium bromide... 

The produced quinone makes black complexes within the original hydroquinone very easily. As shown in Figure 4.48, when the crystals of hydroquinone and quinone are placed separately, the dark-violet crystals of the complex, which are called quinhydron, appear between the two crystalline samples. We tried to stabilize hydroquinone by making complexes with various surfactant molecules containing quaternary ammonium salts, such as alkyltrimethylammonium halides, benzyl(alkyl)dimethyl-ammonium chloride, and ethyl(hexadecyl)dimethylammonium bromide (ECDAB). After many trials, complex crystals suitable for X-ray analysis were formed with benzyl(hexadecyl)dimethylammonium chloride (BCDAC) and ECDAB, as shown in Figure 4.49. 

Ci(i alkyltrimethylammonium bromide, C jj alkanoylaminophenyl trimethylammonium methylsul-fate, and Ci alkylpyridinium chloride from pharmaceutical preparations... 

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