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Tunable wetting of polymer surfaces.

Iskender Yilgor¹, Sevilay Bilgin, Mehmet Isik

¹Surface Science and Technology Center (KUYTAM), Chemistry Department, Koc University, Istanbul 34450 Turkey. iyilgor@ku.edu.tr

Langmuir : the ACS Journal of Surfaces and Colloids

|September 20, 2012

Summary

A new method allows tunable surface wetting on various polymers. This technique uses silica mixtures to achieve superhydrophilic to superhydrophobic surfaces, broadening material applications.

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Area of Science:

Materials Science
Surface Chemistry
Polymer Science

Background:

Controlling surface wettability is crucial for advanced material applications.
Existing methods for tunable surface wetting can be complex or limited in scope.
Developing versatile and simple techniques for surface modification is an ongoing challenge.

Purpose of the Study:

To develop a simple and broadly applicable method for creating polymer surfaces with controlled wettability.
To demonstrate the ability to tune surface wetting from superhydrophilic to superhydrophobic.
To investigate the influence of substrate type and coating composition on surface properties.

Main Methods:

Spin-coating a hydrophilic/hydrophobic silica mixture onto polymer substrates.

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Varying the ratio of hydrophilic to hydrophobic silica to control wettability.

Characterization using scanning electron microscopy, white light interferometry, atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle measurements.

Main Results:

Successfully prepared polymer surfaces with static water contact angles ranging from 0° to over 170°.
Demonstrated tunable wettability from superhydrophilic to superhydrophobic by adjusting the silica mixture ratio.
Confirmed the method's applicability to polystyrene and cross-linked epoxy resin films.
Investigated the effects of substrate material and silica composition on surface behavior.

Conclusions:

A straightforward spin-coating method enables precise control over polymer surface wettability.
The technique offers a scalable approach to achieving a wide spectrum of surface wetting properties.
This method provides a versatile platform for designing functional polymer surfaces for diverse applications.