Titre: New Materials Chemistry from Cellulose Nanocrystals
Endroit: Pavillion P. J. Bombardier, salle 1035
Hôte: Wust James D.
Résumé: Cellulose nanocrystals (CNCs) extracted from biomass, including cotton and wood pulp, form stable colloidal suspensions in water and also organize into a chiral nematic liquid crystal when concentrated in water. This chiral nematic organization is retainedin dried films of CNCs, giving films with bright, iridescent colors.[1]Our group has been active in using CNCs as a template to construct novel chiral nematic mesoporous materials with photonic properties.[2] We have succeeded in preparing silica,[3]organosilica,[4] and polymeric materials[5] through self-assembly or templating methods.In this presentation, I will discuss our some of our recent explorations with CNCs, including hydrogels (Fig. 1) and aerogels,[6] tactoids,[7,8]or elastomers with tunable optical properties.
1]Revol, J.-F.; Godbout, L.; Gray, D. G. J. Pulp Pap. Sci. 1998, 24, 146-149.[2]Giese, M.; Blusch, L. K.; Khan, M. K.; MacLachlan, M. J. Angew. Chem. Int. Ed.2015, 54, 2888-2910.[3]Shopsowitz, K. E.; Qi, H.; Hamad, W. Y.; MacLachlan, M.J. Nature2010, 468, 422-425.[4]Shopsowitz, K.E.; Hamad, W.Y.; MacLachlan, M.J. J. Am. Chem. Soc.2012, 134, 867-870.[5]Khan, M. K.; Bsoul, A.; Walus, K.; Hamad, W. Y.; MacLachlan, M. J. Angew.Chem. Int. Ed.2015, 54, 4304-4308.[6]Oechsle, A. L.; Lewis, L.; Hamad, W. Y.; Hatzikiriakos, S. G.; MacLachlan, M. J.Chem. Mater.2018, 30, 376-385.[7] Wang, P.-X., Hamad, W. Y.; MacLachlan, M. J. Angew. Chem. Int. Ed.2018, 130, 3418-3423.[8]Wang, P.-X.; Hamad, W. Y.; MacLachlan, M. J. Chem2019, 5, 681–692.
