Dispersant adsorption and viscoelasticity of alumina suspensions measured by quartz crystal microbalance with dissipation monitoring and in situ dynamic rheology

Langmuir : the ACS Journal of Surfaces and Colloids
Lisa Palmqvist, Krister Holmberg

Abstract

Adsorption behavior and water content of adsorbed layers of four dispersants for aqueous ceramic processing were studied by quartz crystal microbalance with dissipation monitoring (QCM-D) on alumina surfaces. The dispersants were a poly(acrylic acid), a lignosulfonate, and two hydrophilic comb copolymers with nonionic polyoxyethylene chains of different molecular weights. A Voigt model was applied to analyze the viscoelastic behavior of the adsorbed dispersant layers. The results from QCM-D were compared with viscoelastic properties determined by in situ dynamic rheology measurements of highly concentrated alumina suspensions during slip casting. The QCM-D results showed that both the poly(acrylic acid) and the lignosulfonate adsorbed in low amounts and in a flat conformation, which generated thin, highly rigid layers less than 1 nm thick. The water content of these layers was found to be around 30% for the lignosulfonate and 35% for the poly(acrylic acid). High casting rate and strength in terms of storage modulus were observed in the final consolidate of the suspensions with the two polyelectrolytes. In contrast, the high molecular weight comb copolymer adsorbed in a less elastic layer with a thickness of about 6 nm, which is...Continue Reading

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Citations

Jul 22, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Mingquan YanJixia Cheng
Nov 3, 2011·The Journal of Physical Chemistry. B·Yonghong DengXueqing Qiu
Apr 20, 2016·Journal of Environmental Sciences (China)·Yue ZhangDongsheng Wang
Sep 10, 2010·Science and Technology of Advanced Materials·Hidehiro Kamiya, Motoyuki Iijima
Apr 18, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Masaki Yanagioka, Curtis W Frank
Mar 4, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Jason R StokesHarmen H J de Jongh
Feb 13, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Lana AlaghaJacob Masliyah

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