Gx. Zhao et Jx. Xiao, RHEOLOGICAL PROPERTIES OF THE AQUEOUS MIXTURES OF CATIONIC-ANIONIC SURFACTANTS, Colloid and polymer science, 273(11), 1995, pp. 1088-1094
The theological properties of the aqueous mixtures of cationic-anionic
surfactants, both in single-phase systems and in aqueous two-phase sy
stems, have been studied. Bizarre theological properties negative thix
otropy, viscoelasticity and high viscosity of shear rate dependent at
relatively low concentration - have been observed. An unusual viscosit
y change, that is, viscosity lowering with increasing concentration, w
as obtained. The negative thixotropy might be due to the existence of
lamellar or sheet-like micelles, viscoelasticity might be induced by r
odlike and lamellar or sheet-like micelles, the high viscosity might b
e a consequence of the formation of network by long rodlike micelles a
nd the concentration-induced viscosity lowering could be interpreted i
n terms of the decrease of micellar dimensions with concentration.