Colloidal stability hematite particles

Effects ofNOM. Laboratory experiments by Tiller (2) on the effects of NOM on the colloidal stability of hematite particles (a-Fe203) are presented in Figure 5. Colloidal stability characterized by the sticking probability (a) is plotted as a function of the concentration of NOM (mg of C/L) added to a... [Pg.322]

Tipping, E. and Higgins, D. C. (1982). The effect of adsorbed humic substances on the colloid stability of hematite particles. Colloid Surf. 5, 85-92. [Pg.636]

Nabavi N., Spalla O., Cabane B.J. Surface chemistry ofnanometric ceria particles in aqueous dispersions. J. Colloid Interface Sci. 1993 160 459 71 Napper, Polymeric Stabilization of Colloidal Dispersions. New York Academic Press, 1983 Ozaki M., Kratohvil S., Matijevic E. Formation of monodisperse spindle-type hematite particles. J. Colloid Interface Sci. 1984 102(1) 146-151... [Pg.451]

Johnson, J.E. Matijevic, E. (1992) Interactions of proteins with uniform colloidal hematite and chromium hydroxide particles. II. Stability and mobility. Colloid Polymer Sd. 270 364-369... [Pg.593]

Penners, N.H.G. Koopal, L.K. (1987) The effect of particle size on the stability of hematite (a-Fe203) hydrosols. Colloids Surfaces 28 67-83... [Pg.616]

Tiller and O Melia (1993) compared their polymer adsorption statistics calculations with data from laboratory experiments on the interaction of polyacrylic and polyaspartic acid as well as of humic acids with hematite. Their conclusion is that, at low ionic strength, anionic polyelectrolytes affect the coagulation of positively charged particles by altering the net surface charge in a way similar to that of multivalent, monomeric anions. Steric repulsion, at low ionic strength (i.e., in fresh water), plays little or no role in the stabilization of hematite colloids by the organic macromolecules used in their work calcium... [Pg.850]

Another area of practical importance is in controlling (or altering) the stability of colloid dispersions by organic acids. In analogy to hydrolyzed cations, polyprotic acids that react with the particles may either promote coagulation or inhibit it. The effect that prevails depends on the charge and the adsorptivity of anions in question. As example, the stability domain for finely dispersed hematite as a... [Pg.861]

Various DHBCs have successfully been used as a stabilizer for the purely steric or combined steric/electrosteric stabilization of ceramic precursor particles like AI2O3 [308,309], BaTiOs [310-314] colloidal silica [315-320] alumina coated Ti02 [321], Ce02 [322], o -Fe203 (hematite) [281,323-325], and various pigments [327] in aqueous solution. The solid amoimt can be stabilized to extremely high concentrations (up to 80 wt % [327]) showing the stabilization capabilities of optimized DHBCs. [Pg.43]

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