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Published on: November 14, 2025
Unidirectional control of anisotropic wetting through surface modification of PDMS microstructures
Daisuke Tanaka1, Daniel Buenger, Haika Hildebrandt
1Interactive Materials Research - DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 14, 2013
Summary
Researchers can control anisotropic wetting on microstructured surfaces by tailoring surface chemistry. Modifying the surface chemistry selectively altered wetting along the pattern direction, offering new possibilities for surface engineering.
Area of Science:
- Surface Science
- Materials Chemistry
- Microfluidics
Background:
- Anisotropically microstructured surfaces exhibit anisotropic wetting phenomena.
- Controlling surface chemistry is key to tailoring wetting properties.
Purpose of the Study:
- To investigate the control of anisotropic wetting by tailoring surface chemistry.
- To explore the effect of surface modification on wetting properties of microstructures.
Main Methods:
- Fabrication of polydimethylsiloxane (PDMS) microchannels.
- Permanent hydrophilization and further functionalization of PDMS surfaces.
- Immobilization of silicon nanoparticles (SiNPs) on microstructured surfaces.
Main Results:
- Wetting parallel to the groove strongly depended on chemical modification.
- Wetting perpendicular to the groove was largely unaffected by surface chemistry.
- Selective unidirectional alteration of anisotropic wetting was achieved by SiNP immobilization.
Conclusions:
- Surface chemistry modification offers a method to control anisotropic wetting.
- Selective functionalization can unidirectionally alter wetting behavior along microstructures.
- This approach provides a pathway for advanced surface engineering applications.
