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Anisotropic wettability on imprinted hierarchical structures.

Fengxiang Zhang1, Hong Yee Low

  • 1Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 2, 2007
PubMed
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Researchers created hierarchical structures on polymers using nanoimprinting lithography, achieving tunable anisotropic wettability for controlled liquid flow in microfluidic devices.

Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Hierarchical structures offer unique surface properties.
  • Controlling surface wettability is crucial for various applications.
  • Nanoimprinting lithography enables precise fabrication of micro- and nanostructures.

Purpose of the Study:

  • To fabricate two-level hierarchical structures on polystyrene (PS) and poly(methyl methacrylate) (PMMA) using sequential nanoimprinting lithography (NIL).
  • To investigate the anisotropic wettability of these hierarchical structures.
  • To demonstrate the tunability of surface wettability without altering surface chemistry.

Main Methods:

  • Sequential nanoimprinting lithography (NIL) was employed to create hierarchical structures with micrometer and sub-micrometer gratings.

Related Experiment Videos

  • Water contact angle measurements were performed to quantify surface wettability and anisotropy.
  • Varying grating orientations were used to tune the anisotropic properties.

    • Main Results:

    • Fabricated hierarchical structures exhibited a wide range of anisotropic wettabilities on both PMMA and PS.
    • PMMA showed anisotropic wettability ranging from 6 to 54 degrees.
    • PS demonstrated anisotropic wettability from 8 to 32 degrees.
    • Surface wettability was tunable up to nearly 120 degrees without surface chemistry modification.

    Conclusions:

    • Two-level hierarchical structures fabricated via NIL can achieve tunable anisotropic wettability on polymers.
    • The ability to control wettability direction is valuable for applications like microfluidic devices.
    • This method provides a pathway for designing surfaces with tailored liquid-interactive properties.