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Optimization of a Nanoparticle Suspension for Freeze Casting
Author(s) -
Lu Kathy,
Kessler Chris S.,
Davis Richey M.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01111.x
Subject(s) - suspension (topology) , dispersant , materials science , rheology , nanoparticle , adsorption , casting , acrylic acid , chemical engineering , microstructure , composite material , particle (ecology) , dispersion (optics) , polymer , chemistry , nanotechnology , organic chemistry , physics , mathematics , engineering , oceanography , homotopy , geology , pure mathematics , optics , monomer
Poly(acrylic acid) (PAA) dispersant concentration, suspension pH, and Al 2 O 3 solids loading effects on PAA adsorption onto Al 2 O 3 nanoparticles were studied; the stability and rheology of the Al 2 O 3 nanoparticle suspensions were examined. The most desirable suspension conditions were 7.5–9.5 for pH and 2.00–2.25 wt% of Al 2 O 3 for the PAA concentration. Electrical double‐layer thickness and PAA adsorption layer thickness comparison showed that electrosteric stabilization was dominant. 45.0 vol% Al 2 O 3 solids loading can be achieved for freeze casting. The maximum solids loading was predicted to be 50.7 vol%. The freeze‐cast sample showed that pre‐rest before freezing was critical for achieving desirable microstructures.