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Salicylhydroxamic acid as an electro-responsive and switchable adhesive molecule.

Kan Wang1, Vedika Khare1, Abhilash Arjan Das1

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Salicylhydroxamic acid (SHAM) is a novel electro-responsive molecule that enables switchable adhesion on metallic surfaces in wet conditions. This reversible adhesive bonding is achieved through protonation and deprotonation, offering potential for advanced adhesive technologies.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • Developing switchable adhesives for wet environments is challenging.
  • Existing materials like catechol-based polymers suffer from irreversible oxidation.
  • Electro-responsive molecules offer tunable adhesion properties.

Purpose of the Study:

  • To investigate salicylhydroxamic acid (SHAM) as a new electro-responsive, switchable adhesive molecule.
  • To evaluate the reversible adhesion switching of a SHAM-containing polymer on a metallic surface.
  • To elucidate the molecular mechanism behind SHAM's electro-responsive adhesion.

Main Methods:

  • Synthesis of a SHAM-containing polymer.
  • Evaluation using a customized Johnson-Kendall-Roberts (JKR) contact mechanics setup with a titanium electrode.
  • Electrochemical characterization using cyclic voltammetry and electrochemical impedance spectroscopy.
  • Spectroscopic analysis including UV-vis, FTIR, and XPS.

Main Results:

  • Electrical potential application reversibly reduced work of adhesion by 84% on a titanium surface.
  • SHAM demonstrated fully reversible adhesion switching via protonation/deprotonation.
  • Catechol-containing polymers showed irreversible oxidation and loss of adhesion.
  • Comparable electrical conductivity was observed between SHAM and catechol polymers.

Conclusions:

  • SHAM exhibits electro-responsive interfacial bonding to metallic surfaces under wet conditions.
  • The reversible switching mechanism relies on the protonation and deprotonation of SHAM.
  • SHAM is a promising candidate for designing new switchable adhesives without irreversible degradation.