Relation between stability of oxide and clay disperse systems and the electric properties of their particles

Electrooptics of β-FeOOH Particles in Aqueous Media

“…The electrooptic methods (7), such as electric dichroism (ED) (1,8), electric birefringence (EB) (2)(3)(4)(5)8), and electric light scattering (ELS) (7,9), were extensively applied for such investigations. The electrooptic quantities are quite important from the fundamental and practical points of view because they are directly related to the stability of the dispersed colloidal systems at low and high concentrations.…”

“…The orientation mechanism of those colloid particles by the applied external electric field is of primary importance to understand the surface properties and the bulk electrooptical behavior in aqueous media. There still remain some unsettled questions raised by ELS and other work, even in dilute concentrations, on the nature of electric dipole moments for the aforementioned colloid systems (7,9,12).…”

Electrokinetics in extremely bimodal suspensions

“…In particular, it has long been reported that some dispersed systems exhibit intriguing anomalous electroorientation manifested in negative electric birefringence [10][11][12][13][14]. But all these phenomena disappear for dilute suspensions, for which the interactions between particles can usually be neglected and only single-particle effects are expected to be measured.…”