Paik, U Hackley, VA Lee, HW 2024-01-21T15:41:11Z 2024-01-21T15:41:11Z 2021-09-04 1999-04 0002-7820 https://pubs.kist.re.kr/handle/201004/142322 The interaction of dispersant and binder on the surface of particles was studied to identify the effect of these additives on aqueous ceramic powder processing. Poly(methacrylic acid) (PMAA) and poly(vinyl alcohol) (PVA) were used as the dispersant and binder, respectively. The adsorption isotherms of the organic additives on silicon nitride were determined. The adsorption of PMAA was differentiated from PVA in the mixed additive system via ultraviolet spectroscopy. The electrokinetic behavior of silicon nitride was measured by using an electrokinetic sonic amplitude analyzer. As the PMAA concentration increased, the isoelectric point (pH(iep)) of silicon nitride shifted from pH 6.7 +/- 0.1 to acidic pH values. The magnitude of the shift depended on the surface coverage of PMAA. PVA did not affect the pH(iep) of suspensions but did cause a moderate decrease in the near-surface potential. Finally, the rheological behavior of silicon nitride suspensions was measured to assess the stability of particles against flocculation in aqueous media; this behavior was subsequently correlated with the electrokinetic and adsorption isotherm data. English AMER CERAMIC SOC POLY(ACRYLIC ACID) SURFACE-CHEMISTRY POLYVINYL-ALCOHOL ADSORPTION STABILITY POWDER Dispersant-binder interactions in aqueous silicon nitride suspensions Article 10.1111/j.1151-2916.1999.tb01843.x 1 JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.82, no.4, pp.833 - 840 JOURNAL OF THE AMERICAN CERAMIC SOCIETY 82 4 833 840 scie scopus 000079929000004 2-s2.0-0032641086 Materials Science, Ceramics Materials Science Article POLY(ACRYLIC ACID) SURFACE-CHEMISTRY POLYVINYL-ALCOHOL ADSORPTION STABILITY POWDER dispersant