TY - JOUR
T1 - Aqueous processing and stabilization of manganese zinc ferrite powders via a passivation-dispersion approach
AU - Mandanas, Michael M.
AU - Shaffer, Walter
AU - Adair, James H.
PY - 2002/9
Y1 - 2002/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0036737321&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036737321&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.2002.tb00427.x
DO - 10.1111/j.1151-2916.2002.tb00427.x
M3 - Article
AN - SCOPUS:0036737321
SN - 0002-7820
VL - 85
SP - 2156
EP - 2160
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 9
ER -