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(1) Presentation(s)

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Mar. 26/11/2019 14:00 Salle RdC, Bâtiment 11, RdC

Séminaire
BROUZET Christophe (Institut de Recherche sur les Phénomènes Hors-Équilibre (IRPHE), Marseille)
Orientational dynamics and effective interfacial tension in dense colloidal nanorod suspensions.

(Matière Molle)


Sommaire:

Dense colloidal suspensions are paramount in many industrial applications. However, as they are governed by Brownian motion and particle interactions, the ability to quantify their dynamics in flowing systems remains challenging. Using nanocelluloses as model systems, we focus on the dynamics of a colloidal nanorod suspension forming a thread in a flow-focusing channel. I will first demonstrate an experimental method for characterization of the nanorod orientation dynamics using a flow-stop technique coupled with a thorough analysis of the orientation relaxation. The coupling of rotational diffusion coefficients to particle size distributions as well as flow-induced orientation mechanisms in the nanorod network will be discussed. Then, I will focus on the shape of the thread formed by the suspension. Using experiments performed with Optical Coherence Tomography and numerical simulations with a Volume of Fluid method, I will exhibit that the development of the thread in the channel is controlled by an effective interfacial tension between the colloidal suspension and water.


Pour plus d'informations, merci de contacter Truzzolillo D.