Interfacial tension measurements with microfluidic tapered channels

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

We developed a microfluidic chip that is capable of measuring interfacial tensions between two liquids directly from a force balance. This functionality is obtained by using a tapered microchannel connected to a straight channel containing the second immiscible liquid. The equilibrium position of the liquid–liquid interface along the tapered channel depends on the interfacial tension, the contact angles with the channel walls, and externally controllable pressures. Using a device of PDMS with a channel height of 50 μm and a width tapering from 300 to 20 μm, equilibrium interfacial tensions (IFTs) could be measured for various systems with and without surfactant that display IFTs between 3 and 38 mN/m. Quantitative agreement with macroscopic measurements was obtained. In the absence of surfactant the resolution of our approach is limited by contact angle hysteresis and pinning. We demonstrate the potential of our device for measuring IFTs that change over time, by progressively exposing the W/O interface to surfactant. This microfluidic method offers interesting perspectives for measuring static or dynamic interfacial tensions on chip, combined with a flexible control over the composition of the continuous phase.
Original languageUndefined
Pages (from-to)3842-
JournalColloids and surfaces A: Physicochemical and engineering aspects
Volume389
Issue number1-3
DOIs
Publication statusPublished - 2011

Keywords

  • METIS-279895
  • IR-104563

Cite this

@article{d003aad5758647aba8dd0cfb93c21e73,
title = "Interfacial tension measurements with microfluidic tapered channels",
abstract = "We developed a microfluidic chip that is capable of measuring interfacial tensions between two liquids directly from a force balance. This functionality is obtained by using a tapered microchannel connected to a straight channel containing the second immiscible liquid. The equilibrium position of the liquid–liquid interface along the tapered channel depends on the interfacial tension, the contact angles with the channel walls, and externally controllable pressures. Using a device of PDMS with a channel height of 50 μm and a width tapering from 300 to 20 μm, equilibrium interfacial tensions (IFTs) could be measured for various systems with and without surfactant that display IFTs between 3 and 38 mN/m. Quantitative agreement with macroscopic measurements was obtained. In the absence of surfactant the resolution of our approach is limited by contact angle hysteresis and pinning. We demonstrate the potential of our device for measuring IFTs that change over time, by progressively exposing the W/O interface to surfactant. This microfluidic method offers interesting perspectives for measuring static or dynamic interfacial tensions on chip, combined with a flexible control over the composition of the continuous phase.",
keywords = "METIS-279895, IR-104563",
author = "H. Gu and Duits, {Michael H.G.} and Mugele, {Friedrich Gunther}",
year = "2011",
doi = "10.1016/j.colsurfa.2011.08.054",
language = "Undefined",
volume = "389",
pages = "3842--",
journal = "Colloids and surfaces A: Physicochemical and engineering aspects",
issn = "0927-7757",
publisher = "Elsevier",
number = "1-3",

}

Interfacial tension measurements with microfluidic tapered channels. / Gu, H.; Duits, Michael H.G.; Mugele, Friedrich Gunther.

In: Colloids and surfaces A: Physicochemical and engineering aspects, Vol. 389, No. 1-3, 2011, p. 3842-.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Interfacial tension measurements with microfluidic tapered channels

AU - Gu, H.

AU - Duits, Michael H.G.

AU - Mugele, Friedrich Gunther

PY - 2011

Y1 - 2011

N2 - We developed a microfluidic chip that is capable of measuring interfacial tensions between two liquids directly from a force balance. This functionality is obtained by using a tapered microchannel connected to a straight channel containing the second immiscible liquid. The equilibrium position of the liquid–liquid interface along the tapered channel depends on the interfacial tension, the contact angles with the channel walls, and externally controllable pressures. Using a device of PDMS with a channel height of 50 μm and a width tapering from 300 to 20 μm, equilibrium interfacial tensions (IFTs) could be measured for various systems with and without surfactant that display IFTs between 3 and 38 mN/m. Quantitative agreement with macroscopic measurements was obtained. In the absence of surfactant the resolution of our approach is limited by contact angle hysteresis and pinning. We demonstrate the potential of our device for measuring IFTs that change over time, by progressively exposing the W/O interface to surfactant. This microfluidic method offers interesting perspectives for measuring static or dynamic interfacial tensions on chip, combined with a flexible control over the composition of the continuous phase.

AB - We developed a microfluidic chip that is capable of measuring interfacial tensions between two liquids directly from a force balance. This functionality is obtained by using a tapered microchannel connected to a straight channel containing the second immiscible liquid. The equilibrium position of the liquid–liquid interface along the tapered channel depends on the interfacial tension, the contact angles with the channel walls, and externally controllable pressures. Using a device of PDMS with a channel height of 50 μm and a width tapering from 300 to 20 μm, equilibrium interfacial tensions (IFTs) could be measured for various systems with and without surfactant that display IFTs between 3 and 38 mN/m. Quantitative agreement with macroscopic measurements was obtained. In the absence of surfactant the resolution of our approach is limited by contact angle hysteresis and pinning. We demonstrate the potential of our device for measuring IFTs that change over time, by progressively exposing the W/O interface to surfactant. This microfluidic method offers interesting perspectives for measuring static or dynamic interfacial tensions on chip, combined with a flexible control over the composition of the continuous phase.

KW - METIS-279895

KW - IR-104563

U2 - 10.1016/j.colsurfa.2011.08.054

DO - 10.1016/j.colsurfa.2011.08.054

M3 - Article

VL - 389

SP - 3842-

JO - Colloids and surfaces A: Physicochemical and engineering aspects

JF - Colloids and surfaces A: Physicochemical and engineering aspects

SN - 0927-7757

IS - 1-3

ER -