Structural details of cellulose nanocrystals/polyelectrolytes multilayers probed by neutron reflectivity and AFM.
Neutron reflectivity measurements and AFM observations were used as complementary techniques to investigate multilayered films consisting of alternating sheets of rigid cellulose nanocrystals and flexible poly(allylamine hydrochloride) (PAH) prepared by the layer-by-layer assembly technique. Both techniques showed that smooth films with a high load of cellulose could be obtained. After deposition, the cellulose component occurred as a double layer with different densities: 50% and 25% for the lower and upper layer, respectively. A linear growth of the multilayer and the presence of a Bragg peak on neutron reflectivity curves indicated the formation of a well-ordered structure resulting from entropy-driven assembly and smoothening effect of the flexible PAH macromolecules. The possible alignment of the nanocrystals when anisotropic suspensions were used is also shown and opens the route to an improved control of the architecture of these multilayers.
Jean
Bruno
B
Centre de Recherche sur les Macromolécules Végétales (CERMAV-CNRS), BP 53, 38041 Grenoble Cedex 9, France. bruno.jean@cermav.cnrs.fr
Dubreuil
Frédéric
F
Heux
Laurent
L
Cousin
Fabrice
F
D002482:Cellulose / Q000737:chemistry*; D019277:Entropy; D046911:Macromolecular Substances / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D053758:Nanoparticles / Q000737:chemistry*; D033363:Neutron Diffraction; D011073:Polyamines / Q000737:chemistry*; D011108:Polymers
D046911:Macromolecular Substances; D011073:Polyamines; D011108:Polymers; C063994:polyallylamine; D002482:Cellulose