Micellar microviscosity of ionic surfactants under high pressure

Abstract

M, respectively. The solution was contained in a sealed glass tube with a 2-nm diameter. Sixteen of the sealed tubes were placed in a large tube, in which the temperature was controlled by circulating water. The position of the large tube was adjusted to have the sample tubes in the middle of the magnet. Eight of the sample tubes contained the solution of 1 and tetracyclone; the other eight samples which contained the solution of tetracyclone only were employed as control experiments. The control experiments were run to test the stability of tetracyclone and provide the initial optical density reading of tetracyclone at 405,496, and 504 nm for the measurements of A(5) and A(tetracyc1one). The typical conversions of 1 and tetracyclone were 45% and 8% at 90 OC for 5 h, respectively. Similar procedures were performed for thermolysis of 1 in benzene, chloroform, benzonitrile, dodecane, and toluene and for the measurements of singlet oxygen formed from 3 and 4 in dioxane. The initial concentrations of 3 and tetracyclone were 1.78 X M, respectively. The initial concentration of 4 and tetracyclone were 8 X IO4 M. The typical conversions of 3 and tetracyclone were 14% and 6% at 90 OC for 10 h, respectively. The typical conversion of 4 and tetracyclone were 50% and 5%, respectively. The data reported represent the average of eight (or sixteen) independent measurements in addition to eight (or sixteen) control experiments. The error refers to the standard deviation. and 4 X