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Małgorzata Wisniewska,Stanisław Chibowski,Teresa Urban 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
The effect of solution pH and molecular weight of polyethylene glycol (PEG) and polyethylene oxide (PEO) on their adsorption as well as stability of the colloidal Al2O3 water suspension was studied. The following methods were applied: turbidimetry, spectrophotometry, viscosimetry, potentiometric titration and microelectrophoresis. It was shown that the increasing solution pH affects conformation of the adsorbed macromolecules which affects the stability properties of such systems. The polymer adsorption causes deterioration of the stability conditions of the investigated alumina systems in comparison to those without polymer at all investigated pH values. At pH 3 and 6 the effect of the suspension destabilization is significantly smaller than at pH 9. The most effective flocculent of Al2O3 water suspension is PEO of the molecular weight 218,000 at pH 9.
Małgorzata Wisniewska,Stanisław Chibowski,Teresa Urban 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The effects of solution pH and degree of polymer hydrolysis on the adsorption mechanism of anionicpolyacrylamide (PAM) on the alumina surface were investigated. The spectrophotometry, potentiometrictitration, microelectrophoresis and thermogravimetry were applied to determine polymer adsorbedamount, surface charge density and zeta potential of solid particles in the presence and absence of PVA,as well as thermal characteristics of Al2O3 surface with the adsorbed polymer, respectively. The obtainedresults indicate that adsorption of PAM decreases with the increasing pH. Additionally, the polymeradsorption level depends on its degree of hydrolysis (which is equivalent to the content of carboxylgroups).
Katarzyna Szewczuk-Karpisz,Małgorzata Wisniewska,Małgorzata Pac-Sosin´ ska,Adam Choma,Iwona Komaniecka 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
This paper describes the electrokinetic, adsorption and stability properties of the silica–exopolysac-charide Sinorhizobium meliloti (EPS). Exopolysaccharide adsorbs on the silica surface in the whole pHrange, but the adsorption amount increases with the pH growth (at pH 9 approx. 0.8 mg/m2). The EPSadsorption affects the electrokinetic and stability properties of the system. At low pH values (3 and 4.6)the increase in the system stability occurs (electrosteric interactions), whereas at higher (7.6 and 9) thelight system destabilization was noted (formation of a single polymer bridges between particles).