Effect of Methanol on Viscosity of Aqueous Solutions of Cationic Surfactants at 298.15 to 323.15 K

Table 2

CMC values of dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) in water and 0.10, 0.20, 0.30, and 0.40 volume fractions of methanol-water at 298.15 K, 308.15 K, 318.15 K, and 323.15 K.

/K	Volume fraction of methanol	CMC/mM
		DTAB	CTAB
298.15	0.0	14.5	0.97
	0.1	17.5	1.21
	0.2	20.5	1.76
	0.3	25.1	3.86
	0.4	34.5	6.83
308.15	0.0	15.4	1.12
	0.1	18.1	1.38
	0.2	21.7	1.80
	0.3	26.4	4.56
	0.4	35.6	7.23
318.15	0.0	16.3	1.23
	0.1	19.5	1.68
	0.2	22.8	2.64
	0.3	27.3	5.74
	0.4	36.7	7.47
323.15	0.0	17.3	1.30
	0.1	20.5	1.80
	0.2	23.7	2.83
	0.3	28.1	5.82
	0.4	37.8	7.44