Interaction forces between silica surfaces in aqueous solutions of cationic polymeric flocculants: effect of polymer charge

Langmuir : the ACS Journal of Surfaces and Colloids
Ying ZhouGeorge V Franks

Abstract

Three cationic polymers with molecular weights and charge density of 3.0 x 10(5) g/mol and 10% (D 6010), 1.1 x 10(5) g/mol and 40% (D6040), and 1.2 x 10(5) g/mol and 100% (D6099) were investigated in aqueous NaCl solutions in the presence of silica. The atomic force microscope (AFM) colloidal probe technique was used to determine silica interparticle interaction forces, which were compared to macroscopic information on the strength of interactions such as compressive yield stress measurements. It was found that in 30 mM NaCl solution the 10% charged polymer produced steric repulsion upon approach and long-range adhesion with multiple pull off events upon retraction at the optimum flocculation concentration. This suggests that the polymer was adsorbed in a conformation where segments extend from the surface, resulting in bridging flocculation. The 40 and 100% charged polymers produced attraction upon approach and strong adhesion with snap out from contact upon separation at optimum polymer dosages. This suggests that these polymers are adsorbed with flat conformations and is typical of charge neutralization or patch attraction. The attractions for 40 and 100% charged polymers measured with the AFM are significantly larger than f...Continue Reading

References

Feb 15, 2002·Advances in Colloid and Interface Science·G C BushellR Amal
May 4, 2004·Journal of Colloid and Interface Science·Saeed FarrokhpayPeter Self
Jul 26, 2005·Journal of Colloid and Interface Science·Angus McFarlaneJonas Addai-Mensah
Apr 25, 2006·Journal of Colloid and Interface Science·Melanie J McGuireKristen E Bremmell
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Ying Zhou, George V Franks

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Citations

Oct 13, 2010·Proceedings of the National Academy of Sciences of the United States of America·C MercaderP Poulin
Mar 22, 2014·Soft Matter·Istvan SzilagyiMichal Borkovec
Nov 3, 2010·Journal of Colloid and Interface Science·Elizaveta BurdukovaGeorge V Franks
Apr 14, 2010·Journal of Colloid and Interface Science·José HierrezueloMichal Borkovec
Nov 17, 2009·Journal of Colloid and Interface Science·Elizaveta BurdukovaGeorge V Franks
May 6, 2009·Journal of Colloid and Interface Science·Ying ZhouGeorge V Franks
Jul 7, 2018·Environmental Science and Pollution Research International·Yuan ZhaoWenyan Liang
Feb 26, 2019·Scientific Reports·Agha Hasan, Pedram Fatehi
Nov 15, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Danfeng YuJinben Wang
Oct 24, 2018·The Journal of Physical Chemistry. B·Morten StornesRita S Dias

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