Skip to Main content Skip to Navigation
Journal articles

Cellulose nanofibril-based multilayered thin films: effect of ionic strength on porosity, swelling, and optical properties

Abstract : TEMPO-oxidized cellulose nanofibrils (CNF) and synthetic poly(allylamine) hydrochloride (PAH) were used to build multilayered thin films via the dipping-assisted layer-by-layer technique. We used the ionic strength, in both CNF suspension and PAH solution, as a key parameter to control the structure of the films. Three systems with different ionic strength parameters were investigated. We studied the growth of the films and their surface morphology by ellipsometry and AFM and investigated their porosity and swelling behavior using neutron reflectivity. Our results showed that the PAH conformation is a determining factor not only for film growth but also for structural properties: with salt-free PAR solution where chains have extended conformation, the resulting films have lower porosity and higher swelling ratios, compared to the ones made using high ionic strength (1 M) PAR solution, where chains have a coiled conformation. The slight aggregation of CNF, induced by adding a small amount of salt (12 mM), has less influence on film growth and porosity, whereas it has a greater impact on swelling. The origin of these differences is discussed. The structure of the films obtained was linked to their optical properties and, in particular, to their antireflective character.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02640220
Contributor : Migration Prodinra <>
Submitted on : Thursday, May 28, 2020 - 2:06:56 PM
Last modification on : Thursday, July 8, 2021 - 3:46:40 AM

Identifiers

Collections

Citation

Firas Azzam, Céline Moreau, Fabrice Cousin, Alain Menelle, Herve Bizot, et al.. Cellulose nanofibril-based multilayered thin films: effect of ionic strength on porosity, swelling, and optical properties. Langmuir, American Chemical Society, 2014, 30 (27), pp.8091 - 8100. ⟨10.1021/la501408r⟩. ⟨hal-02640220⟩

Share

Metrics

Record views

31