Hexanol-cetyltrimethylammonium

Ekwall P, Mandell L, Fontell K (1969) Cetyltrimethylammonium Bromide-Hexanol-Water System. J Colloid Interface Sci 29 639... 

Figure 9.1 The phase diagram for the positively charged surfactant CTAB (cetyltrimethylammonium bromide) depending on the relative concentration of CTAB, water, and hexanol, quite different organized structures are formed.

Preparation and Polymerization of (0/W) Cetyltrimethylammonium Bromide Microemulsion (CTAB-yE) (5-7). An oil in water pE composed of 1.0 g of CTAB, 0.5 g of hexanol, and 1.0 g of 50% styrene-divinylbenzene in 50 mL of water was carefully prepared by slowly adding the water to a stirred mixture of the other components to yield a slightly bluish clear solution. A 0.1% solution (w/w) of initiator AIBN (based on monomer) was then solubilized in the system followed by removal of 02 (by gentle N2 bubbling for 5 min), and finally the system was heated in an oil bath (50°C) until complete polymerization was achieved as determined spectrophotometrically. Proper dilution with water was then made to give a 0.01 M CTAB-P-pE solution P-pE indicates polymerized microemulsion. 

The cationic cetyltrimethylammonium bromide-hexanol-water system contains hexanol, which forms the organic phase and plays the role of cosurfactant. It has been mapped by Ahmad and Friberg [39] (see Fig. 1). Although possessing a large L2 domain, this microemulsion is capable of solubilizing only small amounts of water at low R values. The mciximum water dispersion appears at 2.16 m CTABr in hexanol for an R value of 44. 

Fig. 5. Cetyltrimethylammonium bromide 2.2 x 10" at 24 . Variation of the relaxation time for the exchange process upon addition of alcohol (A) methanol ( ) ethanol (x) propanol (d) butanol (+) pentanol and (0) hexanol. Note the similarity between these curves and those relative to the change of a with 1 values were measured by...

EkwaU P, MandeU L, FonteU K (1969) The cetyltrimethylammonium bromide-hexanol-water... 

The kinetics of the basic hydrolysis of ethyl / -nitrophenyl ethylphosphonate (190) in the SDS-hexanol-water reverse micellar system has shown that at high pH and low water content the reaction occurs in the surface layer and is adequately described by a pseudo-phase model.The reactivity of ethyl aryl chloromethylphosphonates (191 X = NO2, Br, H, Et, Bu, n-octyl) in the basic hydrolysis reactions in direct micelles of cetyltrimethylammonium bromide depends on both the electronic and the hydrophobic... 

Wan-Badhi, W., Bloor, D.M., Wyn-Jones, E. The partition of n-hexanol into micelles of cetyltrimethylammonium bromide in aqneons solntion nltrasonic relaxation and head-space analysis measurements. Langmuir 1994, 10(J), 2219-2222. 

One of the first reported instances of catalysis by reversed micelles in the early 1970s concerned the hydrolysis of p-nitrophenyldodecanoate in hexanol-water systems containing cetyltrimethylammonium bromide (CTAB). Since that time, nonaqueous systems have gained greater attention as models that mimic the catalytic activity of natural enzymatic reactions. The fundamental principles controlling activity in nonaqueous systems are basically the same as those for aqueous solu-... 

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