Deakin University
Browse

File(s) under permanent embargo

Nature of crystalline particle assembly in ring shaped colloidal stains from concentrated dispersions

journal contribution
posted on 2014-04-15, 00:00 authored by F Shao, T Huynh, Anthony SomersAnthony Somers, B Liu, J Fu, M Muradoglu, T W Ng
The drying of colloidal droplet suspensions is important in many realms of practical application and has sustained the interest of researchers over two decades. The arrangements of polystyrene and silica beads, both of diameter 1 μm, 10% by volume of solid deposited on normal glass (hydrophilic), and silicone (hydrophobic) surfaces evaporated from a suspension volume of 3 μL, were investigated. Doughnut shape depositions were found, imputing the influence of strong central circulation flows that resulted in three general regions. In the central region which had strong particle build-up, the top most layers of particle arrangement was confirmed to be disordered using power spectrum and radial distribution function analysis. On closer examination, this appeared more like frustrated attempts to crystallize into larger grains rather than beads arranging in a disordered fashion throughout the piling process. With an adapted micro-bulldozing operation to progressively remove layers of particles from the heap, we found that the later efforts to crystallize through lateral capillary inter-particle forces were liable to be undone once the particles contacted the disorganized particles underneath, which were formed out of the jamming of fast particles arriving at the surface. © 2014 Elsevier B.V.

History

Journal

Physica B: condensed matter

Volume

441

Pagination

21 - 27

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0921-4526

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, Elsevier