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Updated: Jul 18, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

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Published on: April 19, 2021

Flow-controlled phase boundaries in Langmuir monolayers.

R M Muruganathan, Th M Fischer

    The Journal of Physical Chemistry. B
    |November 17, 2006
    PubMed
    Summary

    Flow instabilities in liquid monolayers create finger-like patterns. These patterns grow with flow velocity, matching theoretical predictions for flow-dominated instabilities.

    Area of Science:

    • Surface science
    • Fluid dynamics
    • Soft matter physics

    Background:

    • Understanding phase transitions in two-dimensional (2-D) systems is crucial.
    • Liquid expanded/liquid condensed (LE/LC) phase boundaries in insoluble monolayers exhibit complex behaviors.
    • Instabilities at phase boundaries can significantly alter material properties and functions.

    Purpose of the Study:

    • To investigate flow-controlled fingering instabilities at the LE/LC phase boundary in a 2-D insoluble monolayer.
    • To analyze the development of steady finger profiles under controlled flow conditions.
    • To determine the relationship between flow velocity and instability characteristics.

    Main Methods:

    • Utilizing a laser-induced thermocapillary pump to control flow.

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    Last Updated: Jul 18, 2026

    Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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    Published on: April 19, 2021

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    12:37

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  • Creating spatially periodic perturbations on the monolayer phase boundary.
  • Observing and quantifying the resulting finger structures and their growth dynamics.

    • Main Results:

    • Steady, one-dimensional finger profiles were observed to develop from initial perturbations.
    • The steady-state modulation wave vector and transient growth rate of the fingers increase with flow velocity.
    • Observed scaling laws for instability growth are consistent with theories for flow-dominated instabilities.

    Conclusions:

    • Flow velocity is a critical parameter controlling fingering instabilities in 2-D insoluble monolayers.
    • The experimental results validate theoretical models for flow-driven interfacial instabilities.
    • This study provides insights into pattern formation at phase boundaries in soft matter systems.