Dynamics and ordering of weakly Brownian particles in directional drying

Cecile Noirjean, Moreno Marcellini, Sylvain Deville, Thomas E. Kodger, and Cécile Monteux
Phys. Rev. Materials 1, 065601 – Published 15 November 2017

Abstract

Drying of particle suspensions is an ubiquitous phenomenon with many natural and practical applications. In particular, in unidirectional drying, the evaporation of the solvent induces flows which accumulate particles at the liquid/air interface. The progressive buildup of a dense region of particles can be used, in particular, in the processing of advanced materials and architectures while the development of heterogeneities and defects in such systems is critical to their function. A lot of attention has thus been paid to correlating the flow and particle dynamics to the ordering of particles. However, dynamic observation at the particle scale and its correlation with local particle ordering are still missing. Here we show by measuring the particle velocities with high frame rate laser scanning confocal microscopy that the ordering of weakly Brownian particles during unidirectional drying in a Hele-Shaw cell opened on one side depends on the velocity of particles that impinge at the pinned liquid/solid interface. Under the ambient and experimental conditions presented in the following, the particle velocities accumulate in two branches. A higher degree of ordering is found for the branch of faster particle velocity which we explain by an increase in the pressure drop which drags the particles into a denser packing as the flow velocity increases. This counterintuitive behavior is the opposite to what is found with Brownian particles, which can reorganize by Brownian motion into denser packing during drying, as long as the flow velocity is not too high. These results show that different kinetic conditions can be used to obtain dense, defect-free regions of particles after drying. In particular, it suggests that rapid, directional drying could be used to control the crystallinity of particle deposits.

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  • Received 12 May 2017
  • Revised 26 September 2017

DOI:https://doi.org/10.1103/PhysRevMaterials.1.065601

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied PhysicsPolymers & Soft Matter

Authors & Affiliations

Cecile Noirjean*, Moreno Marcellini, and Sylvain Deville

  • Ceramic Synthesis and Functionalization Lab, UMR3080 CNRS/Saint-Gobain, 84306 Cavaillon, France

Thomas E. Kodger

  • Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708WE Wageningen, The Netherlands

Cécile Monteux

  • SIMM, UMR 7615 CNRS-ESPCI-Université Pierre et Marie Curie, ESPCI, Paris, France

  • *ce.noirjean@gmail.com
  • sylvain.deville@saint-gobain.com

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Issue

Vol. 1, Iss. 6 — November 2017

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