Dispersion and Rheology of Aqueous Suspensions of Nanosized BaTiO 3 Isabel Santacruz* IPTME, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK Instituto de Cera´mica y Vidrio, CSIC, C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain Departamento de Quı´mica Inorga´nica, Universidad de Ma´laga, 29071 Ma´laga, Spain Jon Binner IPTME, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK Maria I. Nieto and Rodrigo Moreno Instituto de Cera´mica y Vidrio, CSIC, C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain The zeta potential and the rheological behavior of aqueous suspensions of a commercial nanosized BaTiO 3 powder were studied. The influence of the volume fraction of solids, the kind and concentration of dispersant, the homogenization tech- nique, and times were investigated. Because the as-received powder contained B5 wt% organics, the powder was calcined to 3501C/0.5 h. After calcination, a good dispersion was achieved for suspensions with up to 80 wt% solids using a polyacrylic- based dispersant combined with tetramethylammonium hydroxide and 10 min of ultrasound. Green bodies obtained by slip casting had relatively low densities (2.6 g/cm 3 , 43% TD), but homogeneous, agglomerate-free microstructures. Introduction Nanostructured materials are receiving increased attention because they have unusual physical and Int. J. Appl. Ceram. Technol., 7 [S1] E135–E143 (2010) DOI:10.1111/j.1744-7402.2009.02467.x Ceramic Product Development and Commercialization This work was partially supported by Spanish Ministry of Science and Innovation (MAT2009-14369-C02-01 project and Ramo ´n y Cajal fellowship, RYC-2008-03523). *isantacruz@uma.es r 2009 The American Ceramic Society