Xu, HongyuBalea Martín, AnaBlanco Suárez, María ÁngelesNegro Álvarez, Carlos Manuel2024-10-242024-10-242024-12Xu, H., Balea, A., Blanco, A., & Negro, C. (2024). Influence of swelling on the efficiency of TEMPO reaction, nanofibril production and characterization. Carbohydrate Polymer Technologies and Applications, 8, 100556.2666-893910.1016/j.carpta.2024.100556https://hdl.handle.net/20.500.14352/109397This paper studies the effect of three swelling pretreatment processes (glycerol, alkaline, and molten salt hydrate) to improve the efficiency of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO)-mediated oxidation (TMO) to produce cellulose nanofibrils (CNFs). The novelty of this research lies in the presentation of a new approach that increases the process`s sustainability. The new pretreatment results in the reduction of both chemical reagents and energy consumption. Results demonstrate that pulps pretreated with molten salt hydrate exhibit a crystallinity index up to 50 % lower than the original fibers, while the carboxyl groups obtained during oxidation increase up to 30 %. The increase in oxidation efficiency allows us to obtain a highly fibrillated CNF with a 50 % dose reduction of TEMPO and NaBr at the same time that the energy consumption (kWh/kg) is reduced by 15%.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal articlehttps://doi.org/10.1016/j.carpta.2024.100556https://www.sciencedirect.com/science/article/pii/S2666893924001361open access66NanocelluloseOxidation efficiencyTempo-mediated oxidationFiber swellingCrystallinity indexCellulose nanofibrilIngeniería química3303 Ingeniería y Tecnología Químicas