Shape changes during the drying of droplets of suspensions
Shape changes during the drying of droplets of suspensions
During drying of droplets of suspensions, several flow regimes contribute to the radial flow of powder to the periphery to leave a pile-up of powder at the rim. It is shown that the shape of the droplet residues can be controlled both by restricting evaporation and by combining high and low boiling point solvents which modify particle flows and produce a range of droplet residues varying from a concave “doughnut” shape, sometimes with a central hole, to a convex dome shape. Addition of formamide to aqueous suspensions is shown to affect powder deposition by setting up a Marangoni flow rather than by reducing evaporation at the periphery. The results find direct application in thick-film combinatorial printing of ceramics to form small disks by droplet drying.
3752-3758
Zhang, Y.
f812509d-2a3c-41aa-8ba1-68210952d5a6
Yang, S.
e0018adf-8123-4a54-b8dd-306c10ca48f1
Chen, L.
586c0d55-dc72-49c0-a4fa-31df7000ce18
Evans, J.R.G.
6f6c8a4c-24ac-4144-a555-51438e4d40e0
11 March 2008
Zhang, Y.
f812509d-2a3c-41aa-8ba1-68210952d5a6
Yang, S.
e0018adf-8123-4a54-b8dd-306c10ca48f1
Chen, L.
586c0d55-dc72-49c0-a4fa-31df7000ce18
Evans, J.R.G.
6f6c8a4c-24ac-4144-a555-51438e4d40e0
Zhang, Y., Yang, S., Chen, L. and Evans, J.R.G.
(2008)
Shape changes during the drying of droplets of suspensions.
Langmuir, 24 (8), .
(doi:10.1021/la703484w).
Abstract
During drying of droplets of suspensions, several flow regimes contribute to the radial flow of powder to the periphery to leave a pile-up of powder at the rim. It is shown that the shape of the droplet residues can be controlled both by restricting evaporation and by combining high and low boiling point solvents which modify particle flows and produce a range of droplet residues varying from a concave “doughnut” shape, sometimes with a central hole, to a convex dome shape. Addition of formamide to aqueous suspensions is shown to affect powder deposition by setting up a Marangoni flow rather than by reducing evaporation at the periphery. The results find direct application in thick-film combinatorial printing of ceramics to form small disks by droplet drying.
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Published date: 11 March 2008
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 165041
URI: http://eprints.soton.ac.uk/id/eprint/165041
ISSN: 0743-7463
PURE UUID: 4a6b1011-f40f-4d3c-a2a2-9a5201b41a28
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Date deposited: 08 Oct 2010 08:18
Last modified: 14 Mar 2024 02:09
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Author:
Y. Zhang
Author:
L. Chen
Author:
J.R.G. Evans
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