Aqueous processing and stabilization of manganese zinc ferrite powders via a passivation-dispersion approach

Michael M. Mandanas, Walter Shaffer, James H. Adair

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A dispersion scheme for aqueous processing of manganese zinc ferrite suspensions is presented. The addition of oxalic acid leads to the formation of a uniform negative charge on the surface such that a cationic polyelectrolyte, polyethyleneimine (PEI), adsorbs and provides electrosteric dispersion. At 0.5 w/w (weight percent with respect to the dry powder) oxalic acid addition, there is a relatively uniform negative surface charge (approximately -30 mV) within the suspension pH range investigated (3-10), eliminating the isoelectric point (pH ∼7.6) present for the as-received metal oxide powder. At the addition of 0.5 w/w PEI on an oxalate-treated surface, the surface charge is constant and positive (∼20 mV) through a wide pH range ∼5-10. The resulting rheological data for passivation-dispersion of relatively high-solids manganese zinc ferrite suspensions (∼80 wt%) demonstrate improved colloid stability with improved theological properties. The resulting apparent viscosity and Bingham yield point is 0.01 Pa·s (12.0 cP) and 0.24 Pa (2.4 dynes/cm2), respectively. A sulfonated napthalene-based dispersant, typically used in industry, gives an apparent viscosity and Bingham yield point of 0.03 Pa·s (32 cP) and 3.1 Pa (31 dynes/cm2), respectively.

Original languageEnglish (US)
Pages (from-to)2156-2160
Number of pages5
JournalJournal of the American Ceramic Society
Volume85
Issue number9
DOIs
StatePublished - Sep 2002

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Aqueous processing and stabilization of manganese zinc ferrite powders via a passivation-dispersion approach'. Together they form a unique fingerprint.

Cite this