@article{,
    author = {Roilo, David; Maestri, Cecilia Ada; Scarpa, Marina; Bettotti, Paolo; Egger, Werner; Koschine, Tönjes; Brusa, Roberto Sennen; Checchetto, Riccardo},
    title = {Cellulose Nanofibrils Films : Molecular Diffusion through Elongated Sub-Nano Cavities},
    editor = {},
    booktitle = {},
    series = {},
    journal = {The Journal of Physical Chemistry C},
    address = {},
    publisher = {},
    edition = {},
    year = {2017},
    isbn = {},
    volume = {121},
    number =  {28},
    pages = {15437-15447},
    url = {https://pubs.acs.org/doi/10.1021/acs.jpcc.7b02895},
    doi = {10.1021/acs.jpcc.7b02895},
    keywords = {},
    abstract = {We have studied the kinetics of gas transport through films made of self-assembled cellulose nanofibrils (CNF) by a time-resolved mass spectroscopy technique. Few micrometers thick films deposited on polylactic acid (PLA) substrates act as impermeable barriers for CO<sub>2</sub>, O<sub>2</sub>, and N<sub>2</sub> and reduce the <sup>2</sup>H<sub>2</sub> (deuterium) and He permeation flux by a factor of ~10<sup>3</sup> with respect to the uncoated substrate. Penetrant transport is controlled by the solution-diffusion mechanism and the coating acts as a diffusive barrier. <sup>2</sup>H<sub>2</sub> and He diffusivity values are in the 10<sup>–10</sup> and 10<sup>–9</sup> cm<sup>2</sup> s<sup>-1</sup> range, respectively, and their migration occurs by thermally activated process with 39 ± 1 and 33 ± 2 kJ mol<sup>–1</sup> activation energy. Positron annihilation lifetime spectroscopy analysis indicates that the diffusive path between the packed nanofibrils consists of elongated cavities with cross-sectional size ∼0.31 nm. Results evidence that the selective transport of the small size penetrants is due to sieving effects and that small penetrant transport occurs in configurational diffusion regime.},
    note = {},
    institution = {Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik, LRT 2 - Institut für Angewandte Physik und Messtechnik, Professur: Dollinger, Günther},
    
    
}