The axisymmetric, rod-like shape of cellulose nanocrystals (CNCs) leads to various degrees of particle ordering in suspension which can be preserved in solid films. Multi-domain orientation is found in films ranging in thickness from subnanometer to many microns prepared by unassisted evaporation, whereas long-range order can be achieved by the application of magnetic, electric and shear forces during deposition or casting. Ordered CNC films have been studied for various purposes including: model cellulose surfaces, iridescent pigments, substrates for uniaxial mechanical measurements, and recently as templates for mesoporous silica and carbon films. This review discusses supported and freestanding ordered films prepared by solvent-casting, spin-coating, solution-dipping and Langmuir-Blodgett deposition, characterized by polarized light, atomic force and electron microscopies as well as circular dichroism, neutron scattering and x-ray/electron diffraction. This information can be used to make ordered CNC films with tailored thickness, composition, morphology and degree of ordering for specific applications.

Ordered cellulose nanocrystal films: A review

245th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.