Rheological behavior of highly concentrated aqueous calcium carbonate suspensions in the presence of polyelectrolytes

Surface charge and rheological properties of raw porcelain gres suspension with acrylic copolymers bearing carboxylic groups

“…SA 33.2 ± 0.08 8.7 ± 0.05 0.011 SA/SS 1 29.5 ± 0.10 9.8 ± 0.09 0.009 SA/SS 2 26.6 ± 0.30 10.0 ± 0.20 0.009 SA/SS 3 31.0 ± 0.10 9.2 ± 0.09 0.008 The zeta potential, ζ, correlated with the specific polymer electrical charge and the adsorption amount. Therefore, both characteristics may affect the final particle electrical charge.…”

“…The plateau observed in the isotherms indicated a monolayer adsorption of the polymers, independently of their composition. 1,25,26 At pH below the IEP of the raw porcelain gres the positive charge of the particles anchors negatively charged dispersants 23,[26][27][28][29] (remember that pK a of acrylic acid is 6.0 and pK a of sulfonic acid is below 1). 30,31 After the adsorption, the interactions between electrical double layers result in repulsion among the particles and electrostatic stabilization takes place.…”

“…Some processing techniques, for example slip casting or injection moulding, use ceramic suspensions with high solid volume and proper stability to improve its economics. 1 However, with increasing solid loading, processing of a suspension becomes increasingly difficult. Since its flow characteristics are usually of crucial importance, they have to be controlled in order to yield a final product with the best properties as well as to improve the economics of the process to optimize energy requirements.…”

Polyelectrolyte adsorption, interparticle forces, and colloidal aggregation

“…They are industrially used in water purication, papermaking, mineral separation, or to control ow properties of particle slurries. [1][2][3][4][5][6] Emerging industrial applications of PEs include, for example, stabilization of metallic iron particles for environmental remediation, use as additives in the chemicalmechanical polishing process, or in biomedical applications. [7][8][9][10][11] PEs are further employed to create protective or functional surface coatings, whereby important approaches include adsorption of PE monolayers, 7,[12][13][14] fabrication of multilayers of oppositely charged PEs, 13,[15][16][17][18] or the preparation of PE brushes by graing or by adsorption of block copolymers.…”

Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed

“…Several studies have shown the effect of dispersants on the rheological properties of slurries (Tari andFerreira, 1998, Kugge andDaicic, 2004). Polyelectrolyte dispersants such as the salts of polyacrylic acid can be used to prepare concentrated suspensions of mineral powder (Garcia, 2001, Tobori andAmari, 2003) and can improve the rheological properties of concentrated calcite suspensions.…”