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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

Foam film stratification studies probe intermicellar interactions.

Chrystian Ochoa¹, Shang Gao², Samanvaya Srivastava^3,4,5

¹Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL 60608.

Proceedings of the National Academy of Sciences of the United States of America

|June 17, 2021

Summary

Stratifying foam films exhibit a characteristic step size related to micellar interactions. This study contrasts this step size with intermicellar distance, revealing insights into supramolecular forces within thin films.

Keywords:

X-ray scattering foams and emulsions soft matter structural forces surface forces

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Area of Science:

Colloid and Surface Science
Soft Matter Physics
Supramolecular Chemistry

Background:

Ultrathin foam films with micelles stratify during drainage.
The step size in film thickness is linked to micellar structures but its relation to intermicellar distance is unclear.
Existing theories do not fully explain the relationship between film thickness step size and micellar interactions.

Purpose of the Study:

To directly compare the step size from foam film stratification with intermicellar distance measured by scattering.
To investigate the role of confinement-induced micellar layering in foam films.
To probe non-Derjaguin-Landau-Verwey-Overbeek (non-DLVO) forces in micellar systems.

Main Methods:

Developed Interferometry Digital Imaging Optical Microscopy (IDIOM) protocols to analyze nanoscopic thickness variations in foam films.
Measured film thickness step size using IDIOM.
Determined intermicellar distance using small-angle X-ray scattering (SAXS) on bulk solutions.

Main Results:

Stratification in foam films yields a characteristic step size related to quantized thickness differences.
The study provides the first direct comparison between foam film step size and bulk intermicellar distance.
Found that confinement-induced micellar layering in foam films is a sensitive indicator of micellar interactions.

Conclusions:

Foam film stratification is a sensitive method to probe supramolecular forces and micellar interactions.
The step size in stratifying films offers insights into structural forces beyond classical DLVO theory.
Understanding these forces is crucial for applications involving colloidal dispersions and thin films.