Rheological studies of aqueous stabilised nano-zirconia particle suspensions

Abstract

In the present investigation aqueous suspensions of nano-and colloidal range particles are stabilised by changing the ambient pH. Rheology is used to establish the stability of the suspensions and it is found that the rheology of the suspensions is strongly dependent on the pH values. The viscosity is highest close to the iso-electric point of the powders. At the iso-electric point the net surface charge on the powder particles is zero and is the cause of the high viscosity. Away from the iso-electric point, the particles are charged, giving rise to a double layer phenomenon and causing the reduction in viscosity. It is also found that increasing the solid contents of the suspensions reduces the pH region of low viscosity.

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

“…Alumina, 1-8 zirconia, [9][10][11][12][13][14][15][16] yttrium stabilized zirconia (YSZ), [17][18][19] and titania [20][21][22] are some of the most widely studied ceramic nanopowder systems. An understanding of the surface properties and the rheological behavior of oxide nanopowder suspensions is essential for many applications, including nanofluids, [23][24][25][26][27] advanced ceramics, 10,28,29 nanocomposites, 25,30 and others.…”

“…An understanding of the surface properties and the rheological behavior of oxide nanopowder suspensions is essential for many applications, including nanofluids, [23][24][25][26][27] advanced ceramics, 10,28,29 nanocomposites, 25,30 and others. Lower suspension viscosities facilitate improved end-product quality as they indicate better dispersed systems, and lower production costs.…”

Methods Used for the Compaction and Molding of Ceramic Matrix Composites Reinforced with Carbon Nanotubes

“…The casting from aqueous slips is widely used for manufacturing thin-walled hollow and solid green bodies from either construction or technical ceramics [124][125][126][127][128][129][130][131]. For making solid green bodies, Processes 2020, 8, 1004 20 of 37 additional doses of the slip are added to the mold several times.…”

Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology

“…This interaction can be controlled with chemical additives in three different ways: electrostatic, steric and electrosteric stabilization [8][9][10]. The selection of dispersant is a critical step in slurry preparation because it might be difficult to find a dispersant that is optimal for all suspension components and for establishing control over the suspension stability and its rheological properties [11,12]. To select the optimal suspension dispersant, it is recommended to conduct preliminary viscosity measurements and sedimentation tests with the variation of type and content of dispersants and binders.…”