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

TitleEffect of the Polydispersity of a Colloidal Drop on Drying Induced Stress as Measured by the Buckling of a Floating Sheet.
Publication TypeJournal Article
Year of Publication2016
AuthorsBoulogne, F, Kong, YLin, Nunes, JK, Stone, HA
JournalPhys Rev Lett
Volume116
Issue23
Pagination238001
Date Published2016 Jun 10
ISSN1079-7114
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.

DOI10.1103/PhysRevLett.116.238001
Alternate JournalPhys. Rev. Lett.
PubMed ID27341259