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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Molecular Lipid Films on Microengineering Materials.

Silver Jõemetsa1, Karolina Spustova2, Kiryl Kustanovich3

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This study reveals novel lipid film formation on diverse surfaces using microfluidics. Findings detail unique adhesion phenomena and predict membrane-surface interactions for biomimetic coatings.

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Area of Science:

  • Materials Science
  • Biophysics
  • Surface Chemistry

Background:

  • Understanding lipid membrane formation on solid substrates is crucial for biomimetic applications.
  • Model membranes are widely used as functional coatings in microfluidic devices and biosensors.

Purpose of the Study:

  • To systematically investigate molecular phospholipid film formation on various solid substrates.
  • To characterize the fluidic properties and adhesion phenomena of lipid membranes on these surfaces.

Main Methods:

  • Lipid films were deposited from small unilamellar vesicles (SUVs) using an open-space microfluidic device.
  • Formation and development of films were monitored using laser scanning confocal microscopy.
  • Coverage, fluidity, and integrity of lipid membranes were evaluated.

Main Results:

  • Investigated phospholipid film formation on diverse materials including glass, mica, SiO2, Al, Al2O3, TiO2, ITO, SiC, Au, Teflon AF, SU-8, and graphene.
  • Observed novel lipid adhesion phenomena: reverse rolling of spreading bilayers, spontaneous multilamellar vesicle nucleation, and formation of double lipid bilayer patches.
  • Characterized membrane coverage, fluidity, and integrity on tested substrates.

Conclusions:

  • Findings provide insights into complex lipid membrane-surface interactions.
  • Enables accurate prediction of membrane behavior in microfabricated devices.
  • Supports the use of model membranes as functional biomimetic coatings.