Solutions of alkali soaps and water in fatty acids

Solutions of alkali soaps and water in fatty axids VII. X-ray scattering of the isotropic liquid L2-phase

“…The chemicals used (octanoic acid, HCs, and sodium octanoate, NaCs, respectively, and the preparation of the samples were the same as in previous studies in this series [9][10][11][12][14][15]. The water was twice distilled.…”

Solutions of alkali soaps and water in fatty acids X. The basic structure of the molecules and the size of the particles of acid octanoates in the L2-phase at water contents below 40%

“…The second difference in comparison with systems containing alcohols, the existence in the fatty acid systems of the peculiar type of L2-phase which extends from non-aqueous melt to a water content of about 96 % [3,5,[7][8][9], was, in contrast, not expected. It suggested a transition from particles of "reversed" type to those of "normal" type inside the same liquid phase [5,[7][8][9].…”

“…However, in the present system, only one of them, 2 NaC8 : 1 HC8, separated in solid crystalline state [3][4][5]. From viscosity measurements, it was evident that the reaction between the sodium soap and the liquid fatty acid also leads to the formation of acid octanoate 1 NaC8:2 HC8, which, at 20 ~ remains dissolved in GL 406 the melt [5,[7][8][9]. This result was afterwards confirmed by IR-measurements [6,10].…”

“…It suggested a transition from particles of "reversed" type to those of "normal" type inside the same liquid phase [5,[7][8][9]. The questions arose of (i) up to which water content the original basic structure of the molecules of the acid octanoate continues to exist and (ii) when have these particles certainly been replaced by particles of "normal" structures.…”

“…The questions arose of (i) up to which water content the original basic structure of the molecules of the acid octanoate continues to exist and (ii) when have these particles certainly been replaced by particles of "normal" structures. From the studies in the 1960s it was directly evident that the definite transformation occurs at water contents between 40 and 55 % and also that one has to do with particles of acid sodium octanoate on both sides of this transition region [5,[7][8][9].…”