How a Surface Nanodroplet Sits on the Rim of a Microcap

S. Peng, Ivan Devic, Huanshu Tan, Detlef Lohse, Xuehua Zhang

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The location and morphology of femtoliter nanodroplets that nucleate and grow on a microcap-decorated substrate in contact with a liquid phase were investigated. We experimentally examined four different wetting combinations of the flat area and the microcaps. The results show that depending on the relative wettability, the droplets sit either on the plain surface or on the top of the microcap or on the rim of the microcap. The contact angle and, for the last case, the radial positions of the nanodroplets relative to the microcap center were characterized, in reasonable agreement with our theoretical analysis, which is based on an interfacial energy minimization argument. However, the experimental data show considerable scatter around the theoretical equilibrium curves, reflecting pinning and thus nonequilibrium effects. We also provide the theoretical phase diagram in parameter space of the contact angles, revealing under which conditions the nanodroplet will nucleate on the rim of the microcap.
Original languageEnglish
Pages (from-to)5744-5754
Number of pages11
JournalLangmuir
Volume32
Issue number23
DOIs
Publication statusPublished - 2016

Fingerprint

rims
Contact angle
Wetting
interfacial energy
wettability
plains
Interfacial energy
Contacts (fluid mechanics)
wetting
Phase diagrams
liquid phases
phase diagrams
optimization
Liquids
Substrates
curves

Keywords

  • METIS-317325
  • IR-100770

Cite this

Peng, S. ; Devic, Ivan ; Tan, Huanshu ; Lohse, Detlef ; Zhang, Xuehua. / How a Surface Nanodroplet Sits on the Rim of a Microcap. In: Langmuir. 2016 ; Vol. 32, No. 23. pp. 5744-5754.
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How a Surface Nanodroplet Sits on the Rim of a Microcap. / Peng, S.; Devic, Ivan; Tan, Huanshu; Lohse, Detlef; Zhang, Xuehua.

In: Langmuir, Vol. 32, No. 23, 2016, p. 5744-5754.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - How a Surface Nanodroplet Sits on the Rim of a Microcap

AU - Peng, S.

AU - Devic, Ivan

AU - Tan, Huanshu

AU - Lohse, Detlef

AU - Zhang, Xuehua

PY - 2016

Y1 - 2016

N2 - The location and morphology of femtoliter nanodroplets that nucleate and grow on a microcap-decorated substrate in contact with a liquid phase were investigated. We experimentally examined four different wetting combinations of the flat area and the microcaps. The results show that depending on the relative wettability, the droplets sit either on the plain surface or on the top of the microcap or on the rim of the microcap. The contact angle and, for the last case, the radial positions of the nanodroplets relative to the microcap center were characterized, in reasonable agreement with our theoretical analysis, which is based on an interfacial energy minimization argument. However, the experimental data show considerable scatter around the theoretical equilibrium curves, reflecting pinning and thus nonequilibrium effects. We also provide the theoretical phase diagram in parameter space of the contact angles, revealing under which conditions the nanodroplet will nucleate on the rim of the microcap.

AB - The location and morphology of femtoliter nanodroplets that nucleate and grow on a microcap-decorated substrate in contact with a liquid phase were investigated. We experimentally examined four different wetting combinations of the flat area and the microcaps. The results show that depending on the relative wettability, the droplets sit either on the plain surface or on the top of the microcap or on the rim of the microcap. The contact angle and, for the last case, the radial positions of the nanodroplets relative to the microcap center were characterized, in reasonable agreement with our theoretical analysis, which is based on an interfacial energy minimization argument. However, the experimental data show considerable scatter around the theoretical equilibrium curves, reflecting pinning and thus nonequilibrium effects. We also provide the theoretical phase diagram in parameter space of the contact angles, revealing under which conditions the nanodroplet will nucleate on the rim of the microcap.

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KW - IR-100770

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