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

Shao, Fenfen, Huynh, Trang, Somers, Anthony, Liu, Boyin, Fu, Jing, Muradoglu, Muradoglu and Ng, Tuck Wah 2014, Nature of crystalline particle assembly in ring shaped colloidal stains from concentrated dispersions, Physica B: condensed matter, vol. 441, pp. 21-27, doi: 10.1016/j.physb.2014.01.020.

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Title Nature of crystalline particle assembly in ring shaped colloidal stains from concentrated dispersions
Author(s) Shao, Fenfen
Huynh, Trang
Somers, AnthonyORCID iD for Somers, Anthony
Liu, Boyin
Fu, Jing
Muradoglu, Muradoglu
Ng, Tuck Wah
Journal name Physica B: condensed matter
Volume number 441
Start page 21
End page 27
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014
ISSN 0921-4526
Keyword(s) Coffee-stain
Colloidal ring
Evaporating droplet
Science & Technology
Physical Sciences
Physics, Condensed Matter
Summary 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.
Language eng
DOI 10.1016/j.physb.2014.01.020
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 869999 Manufacturing not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
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