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Polymer-free electrospinning of tannic acid and cross-linking in water for hybrid supramolecular nanofibres

Abstract

Electrospinning is the process of choice allowing the preparation of nanofibrous materials from a solution usually based on a high molar mass polymer. The solution must bring enough chain entanglements to avoid any breaking or Raleigh instability of the electrospun jet resulting thus to the deposition of a continuous and regular solid nanofibre. It has been however shown that some few non-polymeric molecules can be electrospun without using a carrier polymer. We demonstrate here the case of tannic acid. Indeed, it was possible to electrospin this molecule solubilised in a mixture of water and ethanol as well as in pure water. Rheology, dynamic light scattering and cryo-TEM highlight the formation of tannic acid aggregates in solution. Above a critical concentration, these aggregates form a supramolecular interconnected network strong enough to allow the electrospinning of a continuous and regular nanofibre. The resulting nanoweb is mechanically stable and can be handled and wrapped. Furthermore, as opposed to the other small molecules for which polymer-free electrospinning was also demonstrated, tannic acid nanowebs can be efficiently cross-linked in water either by oxidative reaction with sodium periodate or, most interestingly, with FeIII by a combination of oxidative reaction and the formation of coordination complexes. The proposed electrospinning and cross-linking strategy is easy, low cost, scalable and uses non-toxic solvents as well as biocompatible and biofunctional molecules. Furthermore, using the ability of tannic acid to coordinate with a wide variety of metals, hybrid smart nanowebs can be envisaged for various applications in biomedical, catalysis as well as environment.

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Publication details

The article was received on 05 Feb 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01067F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Polymer-free electrospinning of tannic acid and cross-linking in water for hybrid supramolecular nanofibres

    M. Allais, D. Mailley, P. Hébraud, D. Ihiawakrim, V. Ball, F. Meyer, A. Hébraud and G. Schlatter, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01067F

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