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Man-made and bioinspired materials from nanocellulose : challenges and opportunities

Laurent Heux CERMAV-CNRS, Structure and Properties of Glycomaterials, CNRS and Grenoble Alpes University

Natural structures exhibit spectacular properties like, for instance, the toughness of wood, the elasticity of primary walls or in the animal kingdom the iridescence of beetle shells. All those properties rely on hierarchical assemblies made of fibrillar nano-elements that fulfill their function at a very reasonable energy cost and a light weight. Among the different possible sources, cellulose is the most abundant polymer produced in Nature. Two types of the so-called “nanocelluloses” are nowadays exploited for their properties i.e. cellulose micro/nanofibrils (MFC/NFC) with almost infinite longitudinal sizes obtained by a mechanical disruption of the original fibers (Figure 1a) or cellulose nanocrystals (CNC) recovered after acid hydrolysis that are rodlike shaped(Figure 2a).

The applications that are considered often requires the modification of their dispersability and hence some kind of surface modification. Nanocellulose can be modified by wet chemistry [1] or prepared as cellulose aerogel (Figure 1b) that can be further hydrophobized [2]. Those aerogels can be directly used after chemical modification for elastomer reinforcement [3]. In colloidal suspension, CNCs can be physically covered by surfactants to give stable suspensions in organic solvents that exhibit nice self-organizing properties in organic solvents [4] (Figure 2b). Recently, we also demonstrated that these nanorods bear a permanent dipole moment [5] that allows their orientation under relatively modest electric fields allowing the control of designed helicoidal structures.

 

Références :

 

[1] N.Guigo, K. Mazeau, J.-L. Putaux, L. Heux Cellulose 21, 4119-4133(2014)
[2]M. Fumagalli ; D. Ouhab ; S. Boisseau ; L. Heux, Laurent, Biomacromolecules , 3246-3255 (2013)
[3] B. DE Gdemaris, J. Berriot, A. Veyland, N. Seeboth, L. Heux, S. Boisseau & M. Fumagalli Rubber composition comprising cellulose , WO2014096188 (A1)
[4] S. Elazzouzi-Hafraoui, J.-L. Putaux and L. Heux J. Phys. Chem. B, 113, 11069-11075 (2009)
[5] B. Frka-Petesic, B. Jean and L. Heux EPL 107 28006 (2014)