Particle size and aspect ratio reduce the permeability of films and materials.
Example: CelluForce NCC®, when added as a layer in poly lactic acid films, greatly improves gas barrier properties*.
*Reference: Chowdhury, R. A., Clarkson, C., & Youngblood, J. P. (2018, 06). 2018 TAPPI International Conference on Nanotechnology for Renewable Materials. Roll-to-roll Fabrication of Transparent Cellulose Nanocrystal (CNC) Coatings with Controlled Anisotropy, 12. Madison, Wisconsin, USA: TAPPI NANO DIVISION.