Tuning kinetics to control droplet shapes on chemically stripe patterned surfaces

H.P. Jansen, Kai Sotthewes, C. Ganser, C. Teichert, Henricus J.W. Zandvliet, Ernst S. Kooij

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)

Abstract

The typically elongated shape of droplets on chemically microstriped surfaces has been suggested to depend strongly on the kinetics during deposition. Here, we unequivocally establish the importance of impact kinetics by comparing the geometry of pico- to microliter droplets deposited from an inkjet nozzle with those obtained by conventional deposition from a syringe. For large Weber numbers, the strongly enhanced spreading during the impact in combination with direction-dependent pinning of the contact line gives rise to more spherical droplets with a low aspect ratio. The impact energy can be minimized by the prolonged firing of small picoliter droplets to form larger droplets or, as shown in the past, by using high-viscosity liquids. In the first case, the impact energy is absorbed by the liquid already present, therewith reducing the impact diameter and consequently forming markedly more elongated droplets
Original languageEnglish
Pages (from-to)13137-13142
Number of pages6
JournalLangmuir
Volume28
Issue number37
DOIs
Publication statusPublished - 2012

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shape control
Tuning
tuning
Kinetics
kinetics
syringes
low aspect ratio
liquids
nozzles
viscosity
Syringes
energy
Liquids
geometry
Contacts (fluid mechanics)
Aspect ratio
Nozzles
Viscosity
Geometry

Keywords

  • METIS-288995
  • IR-84698

Cite this

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title = "Tuning kinetics to control droplet shapes on chemically stripe patterned surfaces",
abstract = "The typically elongated shape of droplets on chemically microstriped surfaces has been suggested to depend strongly on the kinetics during deposition. Here, we unequivocally establish the importance of impact kinetics by comparing the geometry of pico- to microliter droplets deposited from an inkjet nozzle with those obtained by conventional deposition from a syringe. For large Weber numbers, the strongly enhanced spreading during the impact in combination with direction-dependent pinning of the contact line gives rise to more spherical droplets with a low aspect ratio. The impact energy can be minimized by the prolonged firing of small picoliter droplets to form larger droplets or, as shown in the past, by using high-viscosity liquids. In the first case, the impact energy is absorbed by the liquid already present, therewith reducing the impact diameter and consequently forming markedly more elongated droplets",
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Tuning kinetics to control droplet shapes on chemically stripe patterned surfaces. / Jansen, H.P.; Sotthewes, Kai; Ganser, C.; Teichert, C.; Zandvliet, Henricus J.W.; Kooij, Ernst S.

In: Langmuir, Vol. 28, No. 37, 2012, p. 13137-13142.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Tuning kinetics to control droplet shapes on chemically stripe patterned surfaces

AU - Jansen, H.P.

AU - Sotthewes, Kai

AU - Ganser, C.

AU - Teichert, C.

AU - Zandvliet, Henricus J.W.

AU - Kooij, Ernst S.

PY - 2012

Y1 - 2012

N2 - The typically elongated shape of droplets on chemically microstriped surfaces has been suggested to depend strongly on the kinetics during deposition. Here, we unequivocally establish the importance of impact kinetics by comparing the geometry of pico- to microliter droplets deposited from an inkjet nozzle with those obtained by conventional deposition from a syringe. For large Weber numbers, the strongly enhanced spreading during the impact in combination with direction-dependent pinning of the contact line gives rise to more spherical droplets with a low aspect ratio. The impact energy can be minimized by the prolonged firing of small picoliter droplets to form larger droplets or, as shown in the past, by using high-viscosity liquids. In the first case, the impact energy is absorbed by the liquid already present, therewith reducing the impact diameter and consequently forming markedly more elongated droplets

AB - The typically elongated shape of droplets on chemically microstriped surfaces has been suggested to depend strongly on the kinetics during deposition. Here, we unequivocally establish the importance of impact kinetics by comparing the geometry of pico- to microliter droplets deposited from an inkjet nozzle with those obtained by conventional deposition from a syringe. For large Weber numbers, the strongly enhanced spreading during the impact in combination with direction-dependent pinning of the contact line gives rise to more spherical droplets with a low aspect ratio. The impact energy can be minimized by the prolonged firing of small picoliter droplets to form larger droplets or, as shown in the past, by using high-viscosity liquids. In the first case, the impact energy is absorbed by the liquid already present, therewith reducing the impact diameter and consequently forming markedly more elongated droplets

KW - METIS-288995

KW - IR-84698

U2 - 10.1021/la302551m

DO - 10.1021/la302551m

M3 - Article

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