title: Water redispersible dried nanofibrillated cellulose by adding sodium chloride.
abstract: The present study reports for the first time a method to obtain water redispersible dried NFC using freeze-drying. No chemical surface modification was required to get this kind of product. Salt addition (sodium chloride: NaCl) strategy has been selected to block and then to regenerate hydrogen bonds during the drying and the redispersion steps, respectively. Several samples were produced at different pH (i.e., 4, 6, 8, and 10). All the redispersed NFC were characterized by different techniques (e.g., FE-SEM, XRD, EPMA-EDX) to check the effect of salt on NFC aggregation. The interactions between NFC and NaCl at different pH conditions have been discussed and the rheology of the redispersed NFC suspension has been performed. All the results prove a perfect water redispersion at pH 8 and exactly similar suspension is obtained after water dispersion of dried NFC following our procedure. These results are very promising for increasing application of NFC.
authors.affiliation: LGP2 Laboratory of Pulp and Paper Science, 461 Rue de la Papeterie, 38402 Saint-Martin d'Hères Cedex 9, France.
authors.forename: Karim
authors.initials: K
authors.lastname: Missoum
authors.forename: Julien
authors.initials: J
authors.lastname: Bras
authors.forename: Mohamed Naceur
authors.initials: MN
authors.lastname: Belgacem
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D003890:Desiccation; D004577:Electron Probe Microanalysis; D005612:Freeze Drying; D006860:Hydrogen Bonding; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D012212:Rheology; D012965:Sodium Chloride / Q000737:chemistry*; D013535:Suspensions; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D013535:Suspensions; D014867:Water; D012965:Sodium Chloride; D002482:Cellulose