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Wednesday, 18 September 2019
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Raw materials & technologies, Raw materials

Nanoparticles as adhesives for gels and biological tissues

Thursday, 20 February 2014

Adhesives are made of polymers because they ensure good contact between surfaces by covering asperities, and retard the fracture of adhesive joints by dissipating energy under stress.

The nanoparticles’ ability to adsorb is the basis for the method

Source: Fotolia/fafoutis

The nanoparticles’ ability to adsorb is the basis for the method

Source: Fotolia/fafoutis

But using polymers to ‘glue’ together polymer gels is difficult, requiring chemical reactions, heating, pH changes, ultraviolet irradiation or an electric field. French researchers from Université Pierre et Marie Curie, Paris, show that strong, rapid adhesion between two hydrogels can be achieved at room temperature by spreading a droplet of a nanoparticle solution on one gel’s surface and then bringing the other gel into contact with it.

Method achieves strong bond

The method relies on the nanoparticles’ ability to adsorb onto polymer gels and to act as connectors between polymer chains, and on the ability of polymer chains to reorganize and dissipate energy under stress when adsorbed onto nanoparticles. The scientists demonstrate this approach by pressing together pieces of hydrogels, for approximately 30 seconds, that have the same or different chemical properties or rigidities, using various solutions of silica nanoparticles, to achieve a strong bond. Furthermore, they show that carbon nanotubes and cellulose nanocrystals that do not bond hydrogels together become adhesive when their surface chemistry is modified. To illustrate the promise of the method for biological tissues, they also glued together two cut pieces of calf’s liver using a solution of silica nanoparticles. As a rapid, simple and efficient way to assemble gels or tissues, this method is desirable for many emerging technological and medical applications such as microfluidics, actuation, tissue engineering and surgery.

The study is published in: Nature 505, January 2014, p. 382-385

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