Jumping drops on super-hydrophobic surfaces: controlling energy transfer by timed electric actuation

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Aqueous sessile drops are launched from a super-hydrophobic surface by electric actuation in an electrowetting configuration with a voltage pulse of variable duration. We show that the jump height, i.e. the amount of energy that is transferred from surface energy to the translational degree of freedom, depends not only on the applied voltage but also in a periodic manner on the duration of the actuation pulse. Specifically, we find that the jump height for a pulse of optimized duration is almost twice as high as the one obtained upon turning off the voltage after equilibration of the drop under electrowetting. Representing the drop by a simple oscillator, we establish a relation between the eigenfrequency of the drop and the optimum actuation time required for most efficient energy conversion. From a general perspective, our experiments illustrate a generic concept how timed actuation in combination with inertia can enhance the flexibility and efficiency of drop manipulation operations
Original languageEnglish
Pages (from-to)4856-4863
Number of pages8
JournalSoft matter
Volume13
Issue number28
DOIs
Publication statusPublished - 19 Jul 2017

Fingerprint

actuation
Interfacial energy
Energy transfer
surface energy
energy transfer
electric potential
pulses
Electric potential
energy conversion
inertia
manipulators
flexibility
Energy conversion
degrees of freedom
oscillators
configurations
Experiments
energy

Cite this

@article{3c38fa51552849b9a505cded4459a92f,
title = "Jumping drops on super-hydrophobic surfaces: controlling energy transfer by timed electric actuation",
abstract = "Aqueous sessile drops are launched from a super-hydrophobic surface by electric actuation in an electrowetting configuration with a voltage pulse of variable duration. We show that the jump height, i.e. the amount of energy that is transferred from surface energy to the translational degree of freedom, depends not only on the applied voltage but also in a periodic manner on the duration of the actuation pulse. Specifically, we find that the jump height for a pulse of optimized duration is almost twice as high as the one obtained upon turning off the voltage after equilibration of the drop under electrowetting. Representing the drop by a simple oscillator, we establish a relation between the eigenfrequency of the drop and the optimum actuation time required for most efficient energy conversion. From a general perspective, our experiments illustrate a generic concept how timed actuation in combination with inertia can enhance the flexibility and efficiency of drop manipulation operations",
author = "Zhantao Wang and {van den Ende}, {Henricus T.M.} and Arjen Pit and R. Lagraauw and Dani{\"e}l Wijnperle and Mugele, {Friedrich Gunther}",
year = "2017",
month = "7",
day = "19",
doi = "10.1039/c7sm00928c",
language = "English",
volume = "13",
pages = "4856--4863",
journal = "Soft matter",
issn = "1744-683X",
publisher = "Royal Society of Chemistry",
number = "28",

}

Jumping drops on super-hydrophobic surfaces : controlling energy transfer by timed electric actuation. / Wang, Zhantao; van den Ende, Henricus T.M.; Pit, Arjen; Lagraauw, R.; Wijnperle, Daniël ; Mugele, Friedrich Gunther.

In: Soft matter, Vol. 13, No. 28, 19.07.2017, p. 4856-4863.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Jumping drops on super-hydrophobic surfaces

T2 - controlling energy transfer by timed electric actuation

AU - Wang, Zhantao

AU - van den Ende, Henricus T.M.

AU - Pit, Arjen

AU - Lagraauw, R.

AU - Wijnperle, Daniël

AU - Mugele, Friedrich Gunther

PY - 2017/7/19

Y1 - 2017/7/19

N2 - Aqueous sessile drops are launched from a super-hydrophobic surface by electric actuation in an electrowetting configuration with a voltage pulse of variable duration. We show that the jump height, i.e. the amount of energy that is transferred from surface energy to the translational degree of freedom, depends not only on the applied voltage but also in a periodic manner on the duration of the actuation pulse. Specifically, we find that the jump height for a pulse of optimized duration is almost twice as high as the one obtained upon turning off the voltage after equilibration of the drop under electrowetting. Representing the drop by a simple oscillator, we establish a relation between the eigenfrequency of the drop and the optimum actuation time required for most efficient energy conversion. From a general perspective, our experiments illustrate a generic concept how timed actuation in combination with inertia can enhance the flexibility and efficiency of drop manipulation operations

AB - Aqueous sessile drops are launched from a super-hydrophobic surface by electric actuation in an electrowetting configuration with a voltage pulse of variable duration. We show that the jump height, i.e. the amount of energy that is transferred from surface energy to the translational degree of freedom, depends not only on the applied voltage but also in a periodic manner on the duration of the actuation pulse. Specifically, we find that the jump height for a pulse of optimized duration is almost twice as high as the one obtained upon turning off the voltage after equilibration of the drop under electrowetting. Representing the drop by a simple oscillator, we establish a relation between the eigenfrequency of the drop and the optimum actuation time required for most efficient energy conversion. From a general perspective, our experiments illustrate a generic concept how timed actuation in combination with inertia can enhance the flexibility and efficiency of drop manipulation operations

U2 - 10.1039/c7sm00928c

DO - 10.1039/c7sm00928c

M3 - Article

VL - 13

SP - 4856

EP - 4863

JO - Soft matter

JF - Soft matter

SN - 1744-683X

IS - 28

ER -