Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts

R.J. Vrancken, M.L. Blow, H. Kusumaatmaja, K. Hermans, A.M. Prenen, C.W.M. Bastiaansen, D.J. Broer, J.M. Yeomans

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21 Citations (Scopus)

Abstract

We present results showing how water drops, produced by ink-jet printing, spread on surfaces patterned with lattices of diamond or triangular posts. Considering post widths typically ~7 m and lattice spacings between 15-40 m, we observe drop shapes with 3,4 and 6-fold symmetry, depending on both the symmetry of the lattice and the shape of the posts. This is a result of the different mechanisms of interface pinning and depinning which depend on the direction of the contact line motion with respect to the post shape. Lattice Boltzmann simulations are used to describe these mechanisms in detail for triangular posts. We also follow the motion of the contact line as the drops evaporate showing that they tend to return to their original shape. To explain this we show that the easy direction for movement is the same for spreading and drying drops. We compare the behaviour of small drops with that of larger drops created by jetting several drops at the same position. We find that the contact line motion is unexpectedly insensitive to drop volume, even when a spherical cap of fluid forms above the posts. The findings are relevant to microfluidic applications and to the control of drop shapes in ink-jet printing.
LanguageEnglish
Pages674-683
Number of pages10
JournalSoft Matter
Volume9
Issue number3
DOIs
StatePublished - 2013

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wetting
Wetting
Substrates
inks
printing
Ink jet printing
spherical caps
symmetry
drying
Diamond
diamonds
spacing
Microfluidics
Contacts (fluid mechanics)
fluids
Drying
water
simulation
Fluids
Water

Cite this

Vrancken, R. J., Blow, M. L., Kusumaatmaja, H., Hermans, K., Prenen, A. M., Bastiaansen, C. W. M., ... Yeomans, J. M. (2013). Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts. Soft Matter, 9(3), 674-683. DOI: 10.1039/C2SM26393A
Vrancken, R.J. ; Blow, M.L. ; Kusumaatmaja, H. ; Hermans, K. ; Prenen, A.M. ; Bastiaansen, C.W.M. ; Broer, D.J. ; Yeomans, J.M./ Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts. In: Soft Matter. 2013 ; Vol. 9, No. 3. pp. 674-683
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abstract = "We present results showing how water drops, produced by ink-jet printing, spread on surfaces patterned with lattices of diamond or triangular posts. Considering post widths typically ~7 m and lattice spacings between 15-40 m, we observe drop shapes with 3,4 and 6-fold symmetry, depending on both the symmetry of the lattice and the shape of the posts. This is a result of the different mechanisms of interface pinning and depinning which depend on the direction of the contact line motion with respect to the post shape. Lattice Boltzmann simulations are used to describe these mechanisms in detail for triangular posts. We also follow the motion of the contact line as the drops evaporate showing that they tend to return to their original shape. To explain this we show that the easy direction for movement is the same for spreading and drying drops. We compare the behaviour of small drops with that of larger drops created by jetting several drops at the same position. We find that the contact line motion is unexpectedly insensitive to drop volume, even when a spherical cap of fluid forms above the posts. The findings are relevant to microfluidic applications and to the control of drop shapes in ink-jet printing.",
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Vrancken, RJ, Blow, ML, Kusumaatmaja, H, Hermans, K, Prenen, AM, Bastiaansen, CWM, Broer, DJ & Yeomans, JM 2013, 'Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts' Soft Matter, vol. 9, no. 3, pp. 674-683. DOI: 10.1039/C2SM26393A

Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts. / Vrancken, R.J.; Blow, M.L.; Kusumaatmaja, H.; Hermans, K.; Prenen, A.M.; Bastiaansen, C.W.M.; Broer, D.J.; Yeomans, J.M.

In: Soft Matter, Vol. 9, No. 3, 2013, p. 674-683.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Hermans,K.

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N2 - We present results showing how water drops, produced by ink-jet printing, spread on surfaces patterned with lattices of diamond or triangular posts. Considering post widths typically ~7 m and lattice spacings between 15-40 m, we observe drop shapes with 3,4 and 6-fold symmetry, depending on both the symmetry of the lattice and the shape of the posts. This is a result of the different mechanisms of interface pinning and depinning which depend on the direction of the contact line motion with respect to the post shape. Lattice Boltzmann simulations are used to describe these mechanisms in detail for triangular posts. We also follow the motion of the contact line as the drops evaporate showing that they tend to return to their original shape. To explain this we show that the easy direction for movement is the same for spreading and drying drops. We compare the behaviour of small drops with that of larger drops created by jetting several drops at the same position. We find that the contact line motion is unexpectedly insensitive to drop volume, even when a spherical cap of fluid forms above the posts. The findings are relevant to microfluidic applications and to the control of drop shapes in ink-jet printing.

AB - We present results showing how water drops, produced by ink-jet printing, spread on surfaces patterned with lattices of diamond or triangular posts. Considering post widths typically ~7 m and lattice spacings between 15-40 m, we observe drop shapes with 3,4 and 6-fold symmetry, depending on both the symmetry of the lattice and the shape of the posts. This is a result of the different mechanisms of interface pinning and depinning which depend on the direction of the contact line motion with respect to the post shape. Lattice Boltzmann simulations are used to describe these mechanisms in detail for triangular posts. We also follow the motion of the contact line as the drops evaporate showing that they tend to return to their original shape. To explain this we show that the easy direction for movement is the same for spreading and drying drops. We compare the behaviour of small drops with that of larger drops created by jetting several drops at the same position. We find that the contact line motion is unexpectedly insensitive to drop volume, even when a spherical cap of fluid forms above the posts. The findings are relevant to microfluidic applications and to the control of drop shapes in ink-jet printing.

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Vrancken RJ, Blow ML, Kusumaatmaja H, Hermans K, Prenen AM, Bastiaansen CWM et al. Anistropic wetting and de-wetting of drops on substrates patterned with polygonal posts. Soft Matter. 2013;9(3):674-683. Available from, DOI: 10.1039/C2SM26393A