Nanocelluloses are stiff nanorods or nanofibers that offer a variety of interactions capabilities. They can interact with other components through Hydrogen bonds or van der Walls interactions thank to the hydroxyl or aliphatic groups of glucose monomers, they can also establish electrostatic interactions due the occurrence of ionic moieties on the crystal surface arising usually from preparation procedures (sulfuric acid hydrolysis or TEMPO oxidation for instance). Furthermore the high level of organization of the cellulose chains within the crystal structure induces uneven exposure of chemical functions on the crystal faces resulting in hydrophobic or hydrophilic character of the faces. In this talk, three examples of thin film elaboration displaying smart or tunable functions will be presented. All elaboration processes take advantage of specific interactions capability of nanocelluloses. The first example will describe the formation of structurally colored thin films composed by cellulose nanocrystals and xyloglucan interacting through Hydrogen and van der Walls interactions1. The second will address the dispersion of single wall carbon nanotubes by cellulose nanocrystals through self-assembly for the elaboration of conductive films2. Finally, films with tunable porosity and antireflective properties can be constructed through the control of electrostatic interactions between a polycation and cellulose nanofibrils3. 1 Coloured Semi-reflective Thin Films for Biomass-hydrolyzing Enzyme Detection. Cerclier C., Lack-Guyomard A., Moreau C., Cousin F., Beury N., Bonnin E, Jean B., Cathala B. Advanced Materials 23: 3791–3795, 2011 2 Cellulose Nanocrystals assisted Dispersion of Luminescent Single Wall Carbon Nanotube for Layer-by-Layer Assembled Hybrid Thin Films. Olivier C., Moreau C., Bertoncini P., Bizot H., Chauvet O., and Cathala B., Langmuir, 28 : 12463–12471, 2012 3 Cellulose-based multilayered thin films: ionic strength effect on porosity, swelling and optical properties. Azzam F., Moreau C., Cousin F., Menelle A., Bizot H. and Cathala B. Langmuir 30 : 8091-8100, 2014

Nanocelluloses as versatile platform of interactions for smart and tunable thin films

249th National Meeting (2015)

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