Study of the Interaction between Particles of Bentonite: Use of Dispersant Additives

Raquel Santos Leite; Renalle Cristina Alves de Medeiros Nascimento; Luciana Viana Amorim

doi:10.4028/www.scientific.net/MSF.798-799.659

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HomeMaterials Science ForumMaterials Science Forum Vols. 798-799Study of the Interaction between Particles of...

Study of the Interaction between Particles of Bentonite: Use of Dispersant Additives

Abstract:

This study has evaluated the influence of dispersant additives on the interaction of sodium bentonite clay in aqueous dispersion. Measurements of apparent viscosity (AV) and plastic viscosity (PV) for the dispersions, before and after additive, were done in a Fann 35A viscometer at ambient temperature and after thermal ageing (366K during 57600 seconds in Fann Roller Oven). The dispersions were prepared with clay contents of 0.04 and 0.08 kg/10^-3m³ of water and the dispersants (sodium polyacrylate and sodium polyphosphate) with 0.02 and 0.04 kg/10^-3m³ of water. Was observed that the dispersions prepared with clay and dispersant at ambient temperature presented, very likely, associations between particles of the type face to face, characterized by the low values of viscosity when compared to the ones of the dispersions containing only clay. Comparing the dispersions at ambient temperature with the aged ones, an increase of VA and VP was observed, wherein the dispersion was in a flocculated state, with associations of the types face-to-edge and/or edge-to-edge.

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Periodical:

Materials Science Forum (Volumes 798-799)

Pages:

659-664

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.798-799.659

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Online since:

June 2014

Authors:

Raquel Santos Leite*, Renalle Cristina Alves de Medeiros Nascimento, Luciana Viana Amorim

Keywords:

Aging, Association between Particles, Dispersions, Viscosity

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