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Updated: May 11, 2026

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Surface Symphony: Orchestrating DPPC/DOPC Monolayer Behavior.

Wisnu Arfian A Sudjarwo¹, Jose L Toca-Herrera¹

¹Institut für Biophysik, Universität für Bodenkultur Wien (BOKU), Vienna, Austria.

Microscopy Research and Technique

|August 27, 2025

Summary

This summary is machine-generated.

Environmental factors like temperature and ions, along with lipid composition, significantly alter lipid monolayers. Changes in these conditions affect molecular packing, fluidity, and domain formation in DPPC/DOPC mixtures.

Keywords:

DOPC DPPC Langmuir monolayer atomic force microscopy

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Area of Science:

Biophysics
Materials Science
Surface Chemistry

Background:

Lipid monolayers are crucial for biological membranes.
Understanding their properties is key to biomimetic applications.
DPPC and DOPC are common model membrane lipids.

Purpose of the Study:

Investigate environmental and compositional effects on DPPC/DOPC monolayers.
Determine how temperature, ions, and DOPC incorporation influence monolayer structure.
Characterize changes in molecular packing, fluidity, and domain morphology.

Main Methods:

Creation and analysis of 1,2-Dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)/1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid monolayers.
Varying temperature, ionic concentrations (CaCl2, KCl), and lipid ratios.
Surface pressure-area isotherm measurements and morphological analysis.

Main Results:

DPPC monolayer phase behavior is temperature-dependent, showing liquid expanded-liquid condensed coexistence below 25°C.
Divalent ions (CaCl2) promote denser DPPC packing than monovalent ions (KCl).
DOPC incorporation enhances fluidity and disrupts DPPC domain formation at 20°C.
Increased surface pressure leads to improved surface coverage and film continuity.

Conclusions:

Temperature, ionic strength, and lipid composition critically modulate DPPC/DOPC monolayer properties.
These factors influence molecular packing, phase transitions, and domain organization.
Findings are relevant for designing advanced lipid-based materials and understanding membrane biophysics.