Robust superhydrophilic patterning of superhydrophobic ormosil surfaces for high-throughput on-chip screening applications


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Beyazkilic P. , Tuvshindorj U., Yildirim A., Elbuken C., Bayindir M.

RSC ADVANCES, vol.6, no.83, pp.80049-80054, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 83
  • Publication Date: 2016
  • Doi Number: 10.1039/c6ra19669a
  • Title of Journal : RSC ADVANCES
  • Page Numbers: pp.80049-80054

Abstract

This article describes a facile method for the preparation of two-dimensionally patterned superhydrophobic hybrid coatings with controlled wettability. Superhydrophobic coatings were deposited from nanostructured organically modified silica (ormosil) colloids that were synthesized via a simple sol-gel method. On the defined areas of the superhydrophobic ormosil coatings, stable wetted micropatterns were produced using Ultraviolet/Ozone (UV/O) treatment which modifies the surface chemistry from hydrophobic to hydrophilic without changing the surface morphology. The degree of wettability can be precisely controlled depending on the UV/O exposure duration; extremely wetted spots with water contact angle (WCA) of nearly 0 degrees can be obtained. Furthermore, we demonstrated high-throughput biomolecular adsorption and mixing using the superhydrophilic patterns. The proposed superhydrophilic-patterned nanostructured ormosil surfaces with their simple preparation, robust and controlled wettability as well as adaptability on flexible substrates, hold great potential for biomedical and chemical on-chip analysis.