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Switchable surface structured hydrogel coatings.

Sander Kommeren1, J Dongmo2, C W M Bastiaansen3

  • 1Dept. of Chemical Engineering and Chemistry, Functional Organic Materials & Devices (SFD), Eindhoven University of Technology, Building 14 - HELIX STO 0.26, De Rondom 70 - 5612 AP, P.O. Box 513 - 5600 MB, Eindhoven, The Netherlands. s.kommeren@tue.nl.

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This summary is machine-generated.

This study introduces a new hydrogel coating with switchable surface structures. The material can be patterned using UV light and reversibly switched between structured and flat states with temperature changes.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Hydrogel-based switchable surfaces are gaining traction in diverse applications.
  • Developing simple and controllable methods for creating these surfaces is crucial.

Purpose of the Study:

  • To present a novel photo-cross-linkable terpolymer for creating hydrogel coatings with switchable surface structures.
  • To demonstrate the control over surface structure formation using ultraviolet (UV) light and temperature.

Main Methods:

  • Synthesis of a photo-cross-linkable terpolymer based on poly(N-isopropylacrylamide) (PNIPAm).
  • Application of the terpolymer as a coating using slit die coating under ambient conditions.
  • Patterning of surface structures via UV illumination through masks.
  • Investigation of swelling ratio control by UV energy dose.
  • Demonstration of reversible switching between structured and flat states using temperature.

Main Results:

  • A novel hydrogel coating with switchable surface structures was successfully fabricated.
  • Slit die coating enabled ambient condition application of the terpolymer.
  • The swelling ratio of the hydrogel coating was precisely controlled by the UV light energy dose.
  • Both simple and complex surface topographies were created using single or multiple UV exposure steps.
  • The hydrogel coatings exhibited reversible switching from a structured to a flat state in response to temperature changes.

Conclusions:

  • The developed terpolymer and method offer a versatile platform for creating switchable hydrogel surfaces.
  • The technique allows for tunable surface patterning and reversible structural changes, applicable in microfluidics, soft robotics, and anti-fouling technologies.