Colloid probe investigation of the stabilization mechanism in aqueous 1,2-propanediol nano-zirconia dispersions

Rheology studies on highly filled nano-zirconia suspensions

“…Triammonium citrate (TAC) was used as an electrostatic dispersant, 2-(2-(2 methoxy ethoxy) ethoxy)acetic acid (trioxadecanoic acid-TODA) as a steric stabilizer and low molecular weight polyacrylic acid (PAA) as electrosteric dispersant. TODA had been used in previous colloid probe investigations and was therefore also utilized here 5,6 .…”

“…Thus, a stable slurry may only be produced if the dispersing medium and dispersants are tailored to the surface chemistry of the ceramic particles which are to be processed. Recently we have investigated the dispersing quality of electrostatically and sterically stabilized particles using the colloid probe technique 5 . The dispersing medium was varied between a pure d.i.…”

Stabilization of alumina with polyelectrolyte and comb copolymer in solvent mixtures of water and alcohols

“…They are not new in ceramic processing, although very few studies of water-based solvent mixtures are reported. Successful processing of barium titanate in water and 22 vol% isopropanol 11 as well as the use of water and 1,2-propanediol for dispersions of nano-sized zirconia 12 has been described. The use of pure alcohols in milling operations prior to granulation and drying gives a highly fluid powder, resulting in high compaction density in the subsequent pressing operation compared to water.…”

Surface Chemical Characterization of Ceramic Materials: Adsorption and Degradation of 3,6,9‐Trioxadecanoic Acid on Nano‐ZrO2

“…Special interest was directed towards degradation behavior of the adsorbates and its influence on dispersant capabilities of TODA regarding stabilization of ethanolic nano-ZrO 2 suspensions. ZrO 2 adsorption sites and the adsorbates formed are examined by diffuse reflectance infrared Fourier transform spectroscopy, thermal analysis, 1 H-, and 13 C-cross polarization magic angle spinning solid-state nuclear magnetic resonance spectroscopy. 1 H as well as 13 C-chemical shifts and the configurations of the corresponding adsorbed TODA species on zirconia sites are predicted by means of density functional theory quantum chemical calculations for supporting the interpretation of the experimental spectral data obtained.…”