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In this paper, we investigate and report the effects of a cationic polyelectrolyte, polydiallydimethylammonium chloride (PDADMAC), on the stability of nano-sized alumina (α-Al 2 O 3 ) suspension. Due to the static electrical repulsion interactions, PDADMAC show significant adsorption on α-Al 2 O 3 only at alkaline pH. Considerable amount of non-adsorbed free PDADMAC...
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