Jump to main content
Jump to site search

Issue 19, 2019
Previous Article Next Article

Flow of condensed particles around a packing front visualized by drying colloidal suspensions on a tilted substrate

Author affiliations

Abstract

A gravity effect was demonstrated for 10 nm particles drying in colloidal suspensions. The particles were well-dispersed and did not sediment. However, when a suspension was dried on a tilted directional cell, a clear downward flow of particles was observed around the packing front, which was the boundary between the packed particles layer and the suspension. Three particle sizes (10–110 nm) were examined, with the most pronounced effect being on the 10 nm particles. The primary origin of the downflow was attributed to condensation of particles near the packing front and the subsequent increase in the overall density of the condensed layer. Because of the flow, the packing front was not parallel to the drying interface and tilted cracks formed in the packed layer. A mathematical model was proposed that considered conservation of the suspended particles in the condensed layer. Three competing factors of particle transport (advection, particle consumption by packing, and particle transport by the downward flow) were used to explain the experimental results. Overall, the results suggested that simple substrate tilting would be useful to evaluate whether suspended particles are easily packed or not during drying.

Graphical abstract: Flow of condensed particles around a packing front visualized by drying colloidal suspensions on a tilted substrate

Back to tab navigation

Supplementary files

Article information


Submitted
08 Feb 2019
Accepted
24 Apr 2019
First published
24 Apr 2019

Soft Matter, 2019,15, 4019-4025
Article type
Paper

Flow of condensed particles around a packing front visualized by drying colloidal suspensions on a tilted substrate

T. Mizuguchi and S. Inasawa, Soft Matter, 2019, 15, 4019 DOI: 10.1039/C9SM00280D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements