In situ characterization of spinel nanoceramic suspensions

Tamar Kadosh, Yachin Cohen, Yeshayahu Talmon, Wayne D. Kaplan

Research output: Contribution to journalArticlepeer-review


In this study, an approach to characterize ceramic colloidal suspensions has been developed, based on vitrification of aqueous ceramic suspensions and microstructural characterization using cryogenic-temperature scanning electron microscopy (cryo-SEM), augmented by conventional rheological measurements. The flocculation phenomenon in as-milled and aged Mg-spinel (MgAl 2O 4) aqueous suspensions was characterized. A microstructure based on hard particle agglomerates separated by long-chain deflocculant molecules was directly observed, and correlated to the rheological properties of the suspension. Several levels of flocculation were detected as a function of suspension preparation conditions. Although suspensions at solid-loading levels appropriate for ceramic processing cannot be characterized using conventional particle size measurement techniques, cryo-SEM can be used to measure characteristic sizes, and to distinguish between agglomerated and flocculated particles, opening a new approach for optimizing solid-loading conditions for slip casting in terms of viscosity and green density.

Original languageEnglish
Pages (from-to)3103-3108
Number of pages6
JournalJournal of the American Ceramic Society
Issue number10
StatePublished - Oct 2012

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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