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Liquid morphologies on structured surfaces: from microchannels to microchips

Gau1, Herminghaus, Lenz

  • 1H. Gau and S. Herminghaus, Max-Planck-Institute (MPI) of Colloids and Interfaces, Rudower Chaussee 5, D-12489, Berlin-Adlershof, Germany. P. Lenz and R. Lipowsky, MPI of Colloids and Interfaces, Kantstrasse 55, D-14513 Teltow-Seehof, Germany.

Science (New York, N.Y.)
|January 5, 1999
PubMed
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Liquid microchannels on structured surfaces exhibit a shape instability, transitioning from a uniform state to a bulged morphology. This novel instability in microfluidic systems offers potential for advanced fluid microchips and microreactors.

Area of Science:

  • Surface science and microfluidics
  • Physics of fluids and instabilities

Background:

  • Liquid microchannels are fabricated on structured surfaces using patterned wettability.
  • These channels consist of hydrophilic stripes on a hydrophobic substrate.

Purpose of the Study:

  • To investigate the shape instability of liquid microchannels on structured surfaces.
  • To characterize the transition from a homogeneous state to a bulged morphology.

Main Methods:

  • Fabrication of liquid microchannels using wettability patterning.
  • Observation and analysis of channel shape evolution with increasing adsorbed volume.

Main Results:

  • A shape instability was observed in liquid microchannels above a critical adsorbed volume.

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  • The instability leads to a transition from a uniform cross-section to a single bulge.
  • This phenomenon differs from the Rayleigh Plateau instability and represents a morphological bifurcation.

    • Conclusions:

    • The observed instability provides a new mechanism for controlling microchannel morphology.
    • The bulged state enables the construction of complex channel networks.
    • These networks have potential applications in fluid microchips and microreactors.