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Related Concept Videos

Adhesion01:14

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Thermally Triggered Injectable Underwater Adhesives.

Mehdi Vahdati1, Guylaine Ducouret1, Costantino Creton1

  • 1Soft Matter Sciences and Engineering, ESPCI Paris, PSL University, Sorbonne University, CNRS, F-75005, Paris, France.

Macromolecular Rapid Communications
|February 19, 2020
PubMed
Summary

Researchers developed a novel underwater adhesive from a thermoresponsive graft copolymer. This injectable solution forms a sticky hydrogel below body temperature, offering strong, water-resistant adhesion without chemical crosslinking.

Keywords:
generic adhesionhydrophobic interactionspressure-sensitive adhesivesthermoresponsive hydrogelsunderwater adhesion

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Adhesion Science

Background:

  • Conventional chemical hydrogels often lack inherent stickiness and rely on crosslinking reactions.
  • Injectable adhesives for underwater or in-situ applications face challenges with stability and efficacy in aqueous environments.
  • Bioinspired materials offer potential for novel adhesive properties mimicking natural systems.

Purpose of the Study:

  • To report a novel bioinspired underwater adhesive with tunable properties.
  • To investigate the mechanism of adhesion in an aqueous medium.
  • To demonstrate an alternative to conventional chemical crosslinking for injectable adhesives.

Main Methods:

  • Synthesis of a graft copolymer with a thermoresponsive backbone.
  • Characterization of the solution-to-hydrogel transition below body temperature.
  • Evaluation of adhesive properties, including fibrillation and energy dissipation under deformation.

Main Results:

  • The injectable aqueous solution transforms into a sticky hydrogel just below body temperature.
  • The hydrogel exhibits pressure-sensitive adhesive (PSA) like behavior due to hydrophobic domain network formation.
  • The material demonstrates robust adhesion in aqueous environments, resisting water weakening of hydrophobic interactions.

Conclusions:

  • The developed hydrogel offers chemistry-insensitive adhesion, a significant advantage over current methods.
  • The bioinspired design provides strong underwater adhesion through a unique hydrophobic nanoscaffold.
  • This thermoresponsive adhesive presents a promising alternative for biomedical and other underwater applications.