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Atomic Force Microscopy

Atomic Force Microscopy

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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

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Janus Nanofilms.

Yara E Ghoussoub¹, Joseph B Schlenoff¹

¹Department of Chemistry and Biochemistry, The Florida State University , Tallahassee, Florida 32306-4390, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 8, 2016

Summary

This summary is machine-generated.

Researchers created a two-sided Janus film with distinct hydrophilic and hydrophobic properties using Nafion and polyelectrolyte multilayers. These free-floating films exhibit enhanced stability in high salt concentrations.

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Area of Science:

Materials Science
Polymer Chemistry
Surface Science

Background:

Polyelectrolyte multilayers (PEMUs) are versatile thin films with tunable properties.
Janus materials, possessing different surface characteristics, are of significant interest for advanced applications.
Controlling surface wettability is crucial for material design and functionality.

Purpose of the Study:

To develop a two-dimensional Janus film with distinct hydrophilic and hydrophobic surfaces.
To investigate the modification of polyelectrolyte multilayer wettability using Nafion.
To produce free-floating Janus films for further characterization and potential applications.

Main Methods:

Adsorption of perfluorinated anionic polyelectrolyte Nafion onto polyelectrolyte multilayers (PEMUs) composed of poly(diallyldimethylammonium) and poly(styrenesulfonate).
Fabrication of ultrathin films on aluminum substrates, followed by release using alkali solution.
Characterization using water contact angle measurements, atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR).

Main Results:

Nafion coating successfully transformed the hydrophilic PEMU surface to hydrophobic.
Free-floating Janus films with thicknesses in the 100 nm range were successfully produced.
XPS confirmed a gradient of Nafion and different fluorine content on opposing film surfaces.
FTIR demonstrated enhanced resistance of Nafion-containing films to decomposition in high salt concentrations.

Conclusions:

A novel method for creating two-dimensional Janus films with tunable wettability was established.
The resulting Janus films exhibit significant differences in surface hydrophilicity.
Nafion incorporation enhances the stability of polyelectrolyte multilayers in saline environments.