Drops on functional fibers: from barrels to clamshells and back

Burak Eral, J. de Ruiter, Riëlle de Ruiter, J.M. Oh, Jung Min Oh, Ciro Semprebon, Martin Brinkmann, Friedrich Gunther Mugele

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Drops on cylindrical fibers are a familiar sight, for instance in the form of dew drops on spider webs. They can exist in two competing morphologies, a cylindrically symmetric barrel state completely engulfing the fiber and an asymmetric clamshell state, in which the drop touches the fiber only sideways. Despite their omnipresence and their practical relevance, e.g. for the adherence of drops to fibers in separation technology and filter materials, the physical mechanisms governing the stability of the two morphologies remained elusive. Using electrowetting-functionalized fibers we can tune the wettability of the fibers and thereby reversibly switch between the two states. This allows determination of the stability limits of both morphologies as a function of the two relevant control parameters, namely the contact angle and the liquid volume. While clamshells are found to prevail for large contact angles and small volumes, and barrels prevail for small angles and large volumes, there is also a wide range of intermediate parameter values, for which both morphologies are mechanically stable. Mapping out the energy landscape of the system by numerical minimization of the free energy we find that the barrel state is easily deformed by non-axisymmetric perturbations. Such perturbations facilitate the transition to the clamshell state and thereby the removal of drops from the fibers. From a general perspective, the demonstration of electrowetting-based reversible switching of liquid morphologies on fibers opens up opportunities for designing functional textiles and porous materials for various applications in detergency, filtering, and controlled absorption and release of liquids.
Original languageUndefined
Pages (from-to)5138-5143
Number of pages6
JournalSoft matter
Volume7
Issue number11
DOIs
Publication statusPublished - 2011

Keywords

  • METIS-276555
  • IR-76491

Cite this

Eral, B., de Ruiter, J., de Ruiter, R., Oh, J. M., Oh, J. M., Semprebon, C., ... Mugele, F. G. (2011). Drops on functional fibers: from barrels to clamshells and back. Soft matter, 7(11), 5138-5143. https://doi.org/10.1039/C0SM01403F
Eral, Burak ; de Ruiter, J. ; de Ruiter, Riëlle ; Oh, J.M. ; Oh, Jung Min ; Semprebon, Ciro ; Brinkmann, Martin ; Mugele, Friedrich Gunther. / Drops on functional fibers: from barrels to clamshells and back. In: Soft matter. 2011 ; Vol. 7, No. 11. pp. 5138-5143.
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abstract = "Drops on cylindrical fibers are a familiar sight, for instance in the form of dew drops on spider webs. They can exist in two competing morphologies, a cylindrically symmetric barrel state completely engulfing the fiber and an asymmetric clamshell state, in which the drop touches the fiber only sideways. Despite their omnipresence and their practical relevance, e.g. for the adherence of drops to fibers in separation technology and filter materials, the physical mechanisms governing the stability of the two morphologies remained elusive. Using electrowetting-functionalized fibers we can tune the wettability of the fibers and thereby reversibly switch between the two states. This allows determination of the stability limits of both morphologies as a function of the two relevant control parameters, namely the contact angle and the liquid volume. While clamshells are found to prevail for large contact angles and small volumes, and barrels prevail for small angles and large volumes, there is also a wide range of intermediate parameter values, for which both morphologies are mechanically stable. Mapping out the energy landscape of the system by numerical minimization of the free energy we find that the barrel state is easily deformed by non-axisymmetric perturbations. Such perturbations facilitate the transition to the clamshell state and thereby the removal of drops from the fibers. From a general perspective, the demonstration of electrowetting-based reversible switching of liquid morphologies on fibers opens up opportunities for designing functional textiles and porous materials for various applications in detergency, filtering, and controlled absorption and release of liquids.",
keywords = "METIS-276555, IR-76491",
author = "Burak Eral and {de Ruiter}, J. and {de Ruiter}, Ri{\"e}lle and J.M. Oh and Oh, {Jung Min} and Ciro Semprebon and Martin Brinkmann and Mugele, {Friedrich Gunther}",
year = "2011",
doi = "10.1039/C0SM01403F",
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Eral, B, de Ruiter, J, de Ruiter, R, Oh, JM, Oh, JM, Semprebon, C, Brinkmann, M & Mugele, FG 2011, 'Drops on functional fibers: from barrels to clamshells and back', Soft matter, vol. 7, no. 11, pp. 5138-5143. https://doi.org/10.1039/C0SM01403F

Drops on functional fibers: from barrels to clamshells and back. / Eral, Burak; de Ruiter, J.; de Ruiter, Riëlle; Oh, J.M.; Oh, Jung Min; Semprebon, Ciro; Brinkmann, Martin; Mugele, Friedrich Gunther.

In: Soft matter, Vol. 7, No. 11, 2011, p. 5138-5143.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Drops on functional fibers: from barrels to clamshells and back

AU - Eral, Burak

AU - de Ruiter, J.

AU - de Ruiter, Riëlle

AU - Oh, J.M.

AU - Oh, Jung Min

AU - Semprebon, Ciro

AU - Brinkmann, Martin

AU - Mugele, Friedrich Gunther

PY - 2011

Y1 - 2011

N2 - Drops on cylindrical fibers are a familiar sight, for instance in the form of dew drops on spider webs. They can exist in two competing morphologies, a cylindrically symmetric barrel state completely engulfing the fiber and an asymmetric clamshell state, in which the drop touches the fiber only sideways. Despite their omnipresence and their practical relevance, e.g. for the adherence of drops to fibers in separation technology and filter materials, the physical mechanisms governing the stability of the two morphologies remained elusive. Using electrowetting-functionalized fibers we can tune the wettability of the fibers and thereby reversibly switch between the two states. This allows determination of the stability limits of both morphologies as a function of the two relevant control parameters, namely the contact angle and the liquid volume. While clamshells are found to prevail for large contact angles and small volumes, and barrels prevail for small angles and large volumes, there is also a wide range of intermediate parameter values, for which both morphologies are mechanically stable. Mapping out the energy landscape of the system by numerical minimization of the free energy we find that the barrel state is easily deformed by non-axisymmetric perturbations. Such perturbations facilitate the transition to the clamshell state and thereby the removal of drops from the fibers. From a general perspective, the demonstration of electrowetting-based reversible switching of liquid morphologies on fibers opens up opportunities for designing functional textiles and porous materials for various applications in detergency, filtering, and controlled absorption and release of liquids.

AB - Drops on cylindrical fibers are a familiar sight, for instance in the form of dew drops on spider webs. They can exist in two competing morphologies, a cylindrically symmetric barrel state completely engulfing the fiber and an asymmetric clamshell state, in which the drop touches the fiber only sideways. Despite their omnipresence and their practical relevance, e.g. for the adherence of drops to fibers in separation technology and filter materials, the physical mechanisms governing the stability of the two morphologies remained elusive. Using electrowetting-functionalized fibers we can tune the wettability of the fibers and thereby reversibly switch between the two states. This allows determination of the stability limits of both morphologies as a function of the two relevant control parameters, namely the contact angle and the liquid volume. While clamshells are found to prevail for large contact angles and small volumes, and barrels prevail for small angles and large volumes, there is also a wide range of intermediate parameter values, for which both morphologies are mechanically stable. Mapping out the energy landscape of the system by numerical minimization of the free energy we find that the barrel state is easily deformed by non-axisymmetric perturbations. Such perturbations facilitate the transition to the clamshell state and thereby the removal of drops from the fibers. From a general perspective, the demonstration of electrowetting-based reversible switching of liquid morphologies on fibers opens up opportunities for designing functional textiles and porous materials for various applications in detergency, filtering, and controlled absorption and release of liquids.

KW - METIS-276555

KW - IR-76491

U2 - 10.1039/C0SM01403F

DO - 10.1039/C0SM01403F

M3 - Article

VL - 7

SP - 5138

EP - 5143

JO - Soft matter

JF - Soft matter

SN - 1744-683X

IS - 11

ER -

Eral B, de Ruiter J, de Ruiter R, Oh JM, Oh JM, Semprebon C et al. Drops on functional fibers: from barrels to clamshells and back. Soft matter. 2011;7(11):5138-5143. https://doi.org/10.1039/C0SM01403F