Influence of bound water layer on the viscosity of oxide nanopowder suspensions

Thermal and physical properties of ZrO2–AlO(OH) nanopowders synthesised by microwave hydrothermal method

“…4), which is in agreement with previously reported works [28,39]. The IEP value for v-AlO(OH) is 9.5 and is slightly higher than reported in the literature (9.1-9.2 [27,40]). The difference may be caused by specific features of nanomaterials obtained by MHS.…”

“…The lower viscosity indicates poor dispersion of nanopowder with a lot of aggregates. Higher viscosity indicates that all particles are contributing to the dynamics of the liquid due to the increased solid-liquid contact around particles [27]. Cinar et al [27] also showed that high viscosity of powders is linked to the bound water on particle surface.…”

“…Higher viscosity indicates that all particles are contributing to the dynamics of the liquid due to the increased solid-liquid contact around particles [27]. Cinar et al [27] also showed that high viscosity of powders is linked to the bound water on particle surface. It was explained that bound water, which exists around the nanoparticles, does not function as a solvent in the system, but behaves as a part of the powder.…”

“…That is because the synthesis of ZrO 2 -Al 2 O 3 ceramics is highly sensitive to synthesis parameters, including concentration, temperature, pH and drying method [9]. Also, synthesis conditions influence density, specific surface area, phase composition of ZrO 2 -Al 2 O 3 [26,27] and the amount of adsorbed water.…”

“…The green body nanostructure depends strongly on the viscosity of the slurry used for its production, which in turn depends on the amount of water physically or chemically bounded to the nanoparticles. Cinar et al [27] showed that nanopowder suspensions based on ZrO 2 -Al 2 O 3 are characterised by higher viscosities compared to micron size powders. The lower viscosity indicates poor dispersion of nanopowder with a lot of aggregates.…”