RHEOLOGICAL EVIDENCE OF ADSORBATE-MEDIATED SHORT-RANGE STERIC FORCES IN CONCENTRATED DISPERSIONS

摘要: In order to examine quantitatively the effect of short-range forces on state dispersion in dense suspensions, a series anionic adsorbates rheology model zirconia concentrated suspension has been studied detail. The additives include sulfate, phosphate, pyrophosphate and polyphosphates as well simple organic acid anions such lactate, malate citrate. shifted pH maximum static yield stress and, equivalently, zero zeta potential (ζ), lower values. also lowered magnitude at ζ= 0. results are all consistent with producing steric barrier equivalent size adsorbed molecule along attractive van der Waals interaction. Separately polyphosphate shown assume flat orientation do not appear produce thick electro-steric coagulation.