Sedimentation of Halloysite (cas 12068-50-7) nanotubes from different deposits in aqueous media at variable ionic strengths

Add time:08/01/2019    Source:sciencedirect.com

Halloysite (cas 12068-50-7) clay is a natural nanomaterial that is attracting a growing interest in colloidal science. The halloysite aqueous dispersion stability is a key aspect for the configuration of a purification protocol as well as to establish the durability of a formulation. A physico-chemical study demonstrated the role of ionic strength and nanotube characteristic sizes on the sedimentation behavior. We highlighted the importance of the electrostatic repulsions exercised between the particles in the settling process. A protocol for image analysis has been proposed to provide robust information from time resolved optical images on the suspensions. In conclusion, we managed to correlate microscopic aspect to the peculiar sedimentation process of halloysite nanotubes.

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