Effect of the Polydispersity of a Colloidal Drop on Drying Induced Stress as Measured by the Buckling of a Floating Sheet

François Boulogne, Yong Lin Kong, Janine K. Nunes, and Howard A. Stone
Phys. Rev. Lett. 116, 238001 – Published 8 June 2016
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Abstract

We study the stress developed during the drying of a colloidal drop of silica nanoparticles. In particular, we use the wrinkling instability of a thin floating sheet to measure the net stress applied by the deposit on the substrate and we focus on the effect of the particle polydispersity. In the case of a bidisperse suspension, we show that a small number of large particles substantially decreases the expected stress, which we interpret as the formation of lower hydrodynamic resistance paths in the porous material. As colloidal suspensions are usually polydisperse, we show for different average particle sizes that the stress is effectively dominated by the larger particles of the distribution and not by the average particle size.

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  • Received 19 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.238001

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

François Boulogne, Yong Lin Kong, Janine K. Nunes, and Howard A. Stone

  • Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 116, Iss. 23 — 10 June 2016

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