Directional liquid spreading over chemically defined radial wettability gradients

O. Bliznyuk, James Richard Thorley Seddon, V. Veligura, Ernst S. Kooij, Henricus J.W. Zandvliet, Bene Poelsema

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)

Abstract

We investigate the motion of liquid droplets on chemically defined radial wettability gradients. The patterns consist of hydrophobic fluorinated self-assembled monolayers (SAMs) on oxidized silicon substrates. The design comprises a central hydrophobic circle of unpatterned SAMs surrounded by annular regions of radially oriented stripes of alternating wettability, i.e., hydrophilic and hydrophobic. Variation in the relative width of the stripes allows control over the macroscopic wettability. When a droplet is deposited in the middle, it will start to move over to the radially defined wettability gradient, away from the center because of the increasing relative surface area of hydrophilic matter for larger radii in the pattern. The focus of this article is on a qualitative description of the characteristic motion on such types of anisotropic patterns. The influence of design parameters such as pattern dimensions, steepness of the gradient, and connection between different areas on the behavior of the liquid are analyzed and discussed in terms of advancing and receding contact lines, contact angles, spatial extent, and overall velocity of the motion.
Original languageEnglish
Pages (from-to)4141-4148
Number of pages8
JournalACS applied materials & interfaces
Volume4
Issue number8
DOIs
Publication statusPublished - 2012

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Wetting
Liquids
Self assembled monolayers
Silicon
Contacts (fluid mechanics)
Contact angle
Substrates

Keywords

  • METIS-287541
  • IR-81163

Cite this

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title = "Directional liquid spreading over chemically defined radial wettability gradients",
abstract = "We investigate the motion of liquid droplets on chemically defined radial wettability gradients. The patterns consist of hydrophobic fluorinated self-assembled monolayers (SAMs) on oxidized silicon substrates. The design comprises a central hydrophobic circle of unpatterned SAMs surrounded by annular regions of radially oriented stripes of alternating wettability, i.e., hydrophilic and hydrophobic. Variation in the relative width of the stripes allows control over the macroscopic wettability. When a droplet is deposited in the middle, it will start to move over to the radially defined wettability gradient, away from the center because of the increasing relative surface area of hydrophilic matter for larger radii in the pattern. The focus of this article is on a qualitative description of the characteristic motion on such types of anisotropic patterns. The influence of design parameters such as pattern dimensions, steepness of the gradient, and connection between different areas on the behavior of the liquid are analyzed and discussed in terms of advancing and receding contact lines, contact angles, spatial extent, and overall velocity of the motion.",
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Directional liquid spreading over chemically defined radial wettability gradients. / Bliznyuk, O.; Seddon, James Richard Thorley; Veligura, V.; Kooij, Ernst S.; Zandvliet, Henricus J.W.; Poelsema, Bene.

In: ACS applied materials & interfaces, Vol. 4, No. 8, 2012, p. 4141-4148.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Directional liquid spreading over chemically defined radial wettability gradients

AU - Bliznyuk, O.

AU - Seddon, James Richard Thorley

AU - Veligura, V.

AU - Kooij, Ernst S.

AU - Zandvliet, Henricus J.W.

AU - Poelsema, Bene

PY - 2012

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N2 - We investigate the motion of liquid droplets on chemically defined radial wettability gradients. The patterns consist of hydrophobic fluorinated self-assembled monolayers (SAMs) on oxidized silicon substrates. The design comprises a central hydrophobic circle of unpatterned SAMs surrounded by annular regions of radially oriented stripes of alternating wettability, i.e., hydrophilic and hydrophobic. Variation in the relative width of the stripes allows control over the macroscopic wettability. When a droplet is deposited in the middle, it will start to move over to the radially defined wettability gradient, away from the center because of the increasing relative surface area of hydrophilic matter for larger radii in the pattern. The focus of this article is on a qualitative description of the characteristic motion on such types of anisotropic patterns. The influence of design parameters such as pattern dimensions, steepness of the gradient, and connection between different areas on the behavior of the liquid are analyzed and discussed in terms of advancing and receding contact lines, contact angles, spatial extent, and overall velocity of the motion.

AB - We investigate the motion of liquid droplets on chemically defined radial wettability gradients. The patterns consist of hydrophobic fluorinated self-assembled monolayers (SAMs) on oxidized silicon substrates. The design comprises a central hydrophobic circle of unpatterned SAMs surrounded by annular regions of radially oriented stripes of alternating wettability, i.e., hydrophilic and hydrophobic. Variation in the relative width of the stripes allows control over the macroscopic wettability. When a droplet is deposited in the middle, it will start to move over to the radially defined wettability gradient, away from the center because of the increasing relative surface area of hydrophilic matter for larger radii in the pattern. The focus of this article is on a qualitative description of the characteristic motion on such types of anisotropic patterns. The influence of design parameters such as pattern dimensions, steepness of the gradient, and connection between different areas on the behavior of the liquid are analyzed and discussed in terms of advancing and receding contact lines, contact angles, spatial extent, and overall velocity of the motion.

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JO - ACS applied materials & interfaces

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