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pH- and Sugar-Responsive Gel Assemblies Based on Boronate-Catechol Interactions.

Masaki Nakahata1, Shoko Mori1, Yoshinori Takashima1

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Phenylboronic acid (PB) gels and catechol (CAT) gels reversibly assemble in basic solutions. Their adhesion strength is tunable via pH and competitive monosaccharides, offering potential for smart materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Investigating interactions between functionalized polymer gels.
  • Understanding self-assembly mechanisms in aqueous media.
  • Exploring stimuli-responsive materials for advanced applications.

Purpose of the Study:

  • To investigate the macroscopic assembly of poly(acrylamide) gels functionalized with phenylboronic acid (PB gel) and catechol moieties (CAT gel).
  • To characterize the adhesion strength and reversibility of the gel assembly.
  • To explore the tunability of adhesion based on environmental stimuli.

Main Methods:

  • Preparation of poly(acrylamide) gels functionalized with phenylboronic acid and catechol moieties.
  • Macroscopic assembly in basic aqueous media.
  • Stress-strain measurements for adhesion strength estimation.
  • pH-dependent studies for assembly/disassembly.
  • Investigation of monosaccharide competition for tunability.

Main Results:

  • PB gels and CAT gels form macroscopic assemblies in basic aqueous media.
  • The assembly and disassembly are reversible and controlled by pH.
  • Adhesion strength is tunable, influenced by competitive monosaccharide molecules.
  • The degree of tunability correlates with the association constant between monosaccharides and PB moieties.

Conclusions:

  • The interaction between PB gels and CAT gels enables reversible macroscopic assembly.
  • pH and competitive monosaccharides offer effective control over gel adhesion strength.
  • These findings suggest potential for developing tunable, self-healing, or responsive materials.