Alkyltrimethylammonium halide surfactant

Bion et al [122] showed that the pore diameter of periodic mesoporous phenylene-silicas could be varied from 3.2 to 3.9 nm by changing the length of the hydrocarbon chain of the alkyltrimethylammonium halide surfactant (C TMAC1/Br) with n ranging from 14 to 18, respectively. 

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. 

Kwak (and co-workers) (10) were the first to employ the electrode method to study interactions involving ionic polymer systems—in their case a series of polyanions of both synthetic and natural origin, and the cationic surfactants, alkyltrimethylammonium and alkyl-pyridinium halides (69,70). ... 

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