Effect of compact spherical potassium 12-tungstosilicate and lithium heteropolytungstate additives on the rheology and surface chemistry of washed spherical and platelet α-Al2O3 suspensions: Patch charge bridging

W. Zhang; C. Sun; Y-K Leong; D. Parsons

doi:10.1016/j.powtec.2019.10.063

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Effect of compact spherical potassium 12-tungstosilicate and lithium heteropolytungstate additives on the rheology and surface chemistry of washed spherical and platelet α-Al2O3 suspensions: Patch charge bridging

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Effect of compact spherical potassium 12-tungstosilicate and lithium heteropolytungstate additives on the rheology and surface chemistry of washed spherical and platelet α-Al2O3 suspensions: Patch charge bridging

W. Zhang, C. Sun, Y-K Leong and D. Parsons

Powder Technology, Vol.360, pp.937-943

2020

DOI: https://doi.org/10.1016/j.powtec.2019.10.063

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Abstract

The zeta potential data confirmed the adsorption of the large compact Keggin [Si(W12O40)]4- and heteropolytungstate (LST) anions on both α-Al2O3. The adsorbed [Si(W12O40)]4- ions should form a thick steric barrier, ~1 nm, but this effect was not reflected in the yield stress results. A relatively strong additional attractive force explained the increasing maximum yield stress. A similar result was observed with LST. For the spherical α-Al2O3 the largest maximum yield stress (at zero charge) occurred at 0.6 dwb% additive. This attractive force was attributed to patch charge attraction between the negative additive patch and the positive surface site. For the low surface area platelet α-Al2O3 suspensions, complete surface coverage occurred at a low additive concentration as reflected by an almost identical all negative zeta potential-pH behaviour at all additive concentrations at low pH. The slightly larger yield stress at pH 2.5 could be due to this patch charge bridging attraction.

Details

Title: Effect of compact spherical potassium 12-tungstosilicate and lithium heteropolytungstate additives on the rheology and surface chemistry of washed spherical and platelet α-Al2O3 suspensions: Patch charge bridging
Authors/Creators: W. Zhang (Author/Creator) - The University of Western Australia
C. Sun (Author/Creator) - University of Science and Technology Beijing
Y-K Leong (Author/Creator) - The University of Western Australia
D. Parsons (Author/Creator) - Murdoch University
Publication Details: Powder Technology, Vol.360, pp.937-943
Publisher: Elsevier B.V.
Identifiers: 991005544177707891
Murdoch Affiliation: Chemistry and Physics
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.22 Inorganic & Nuclear Chemistry; 2.22.1074 Polyoxometalates
Web Of Science research areas: Engineering, Chemical
ESI research areas: Chemistry