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Related Experiment Videos

Patterned supported lipid bilayers and monolayers on poly(dimethylsiloxane).

Peter Lenz1, Caroline M Ajo-Franklin, Steven G Boxer

  • 1Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. peter.lenz@physik.uni-marburg.de

Langmuir : the ACS Journal of Surfaces and Colloids
|December 1, 2004
PubMed
Summary

Researchers developed a straightforward method to pattern supported lipid bilayers on poly(dimethylsiloxane) surfaces. This technique precisely controls lipid assembly, creating distinct regions of bilayers, monolayers, and bare surfaces for advanced material applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biomaterials Engineering

Background:

  • Supported lipid bilayers (SLBs) are crucial for mimicking cell membranes in biomaterial applications.
  • Controlled patterning of SLBs on polymer substrates like poly(dimethylsiloxane) (PDMS) remains a challenge.
  • Surface properties, such as hydrophilicity, significantly influence lipid assembly and stability.

Purpose of the Study:

  • To present a simple and practical method for patterning supported lipid bilayers and monolayers on PDMS.
  • To achieve controlled spatial organization of different lipid structures (bilayers, monolayers, bare regions) on a single surface.
  • To establish a method for tuning substrate chemical composition to direct lipid assembly.

Main Methods:

  • Utilized electron microscopy grids to create lateral gradients in plasma oxidation on PDMS surfaces.

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  • Controlled the extent of plasma oxidation to generate regions with varying surface hydrophilicities.
  • Applied millimeter-sized plastic masks and varied plasma-cleaning times to control patterning on macroscopic scales.

    • Main Results:

    • Achieved spontaneous formation of side-by-side lipid bilayers and monolayers on the patterned PDMS surface.
    • Successfully created regions that reject lipid adhesion or adsorb intact lipid vesicles.
    • Demonstrated controlled influence over substrate chemical composition to support specific lipid structures or prevent adhesion.

    Conclusions:

    • The developed method offers a practical approach for creating complex lipid architectures on PDMS.
    • This technique enables precise control over surface chemistry to dictate lipid assembly, opening new avenues for biomaterial design.
    • The ability to pattern fluid lipid monolayers, reject lipid adhesion, and support fluid bilayers provides a versatile platform for surface functionalization.