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Rapidly responsive smart adhesive-coated micropillars utilizing catechol-boronate complexation chemistry.

Ameya R Narkar1, Chito Kendrick2, Kishan Bellur3

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Researchers developed smart adhesive hydrogels on micropillars that switch between strong and weak adhesion in one minute by changing pH. This rapid response is due to the increased surface area of the hydrogel coating.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Developing advanced adhesives with tunable properties is crucial for various applications.
  • Stimuli-responsive materials offer dynamic control over adhesion.
  • Hydrogels provide biocompatible platforms for adhesive development.

Purpose of the Study:

  • To create and characterize smart adhesive hydrogels on polydimethylsiloxane (PMDS) micropillars.
  • To investigate the pH-triggered adhesion switching behavior of these coated micropillars.
  • To compare the transition rates of coated pillars with bulk hydrogels.

Main Methods:

  • In situ polymerization of dopamine methacrylamide (DMA) and 3-acrylamido phenylboronic acid (APBA) onto PMDS micropillars.
  • Johnson-Kendall-Roberts (JKR) contact mechanics tests to measure adhesion.
  • pH variation to induce deactivation and reactivation of adhesion.

Main Results:

  • Adhesive-coated pillars showed strong wet adhesion (Wadh = 420 mJ m-2) at pH 3.
  • Adhesion could be repeatedly switched between strong (pH 3) and weak (pH 9) states.
  • Coated pillars exhibited a significantly faster transition rate (1 min) compared to bulk hydrogels.

Conclusions:

  • The smart adhesive hydrogel-coated micropillars demonstrate rapid, reversible pH-responsive adhesion.
  • The enhanced surface area to volume ratio of the coated pillars facilitates faster ion diffusion and complex formation/breakage.
  • These findings offer potential for dynamic adhesive applications requiring fast switching capabilities.