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, Howard A. Stone

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Article number238001
JournalPhysical review letters
Volume116
Issue number23
DOIs
StatePublished - Jun 8 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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