Ion conductivity through TEMPO-mediated oxidated and periodate oxidated cellulose membranes. (1st April 2020)

• Record Type: Journal Article
• Authors: Dahlström, C.; López Durán, V.; Keene, S.T.; Salleo, A.; Norgren, M.; Wågberg, L.
• Is Part Of: Carbohydrate polymers. Volume 233(2020)
• Publication Date: 2020-04-01
• Subjects: Cellulose nanofibrils -- Ion conductivity -- TEMPO oxidation -- Periodate oxidation -- Structure-property relationship -- Specific ion effects; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.115829
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Ion conductivity through membranes depends on cellulose properties and electrolyte. Specific ion effects could be observed for the TEMPO-oxidised cellulose. Periodate oxidated cellulose showed low ion conductivity for all electrolytes. Swelling was inhibited for the periodate oxidated cellulose. Abstract: Cellulose in different forms is increasingly used due to sustainability aspects. Even though cellulose itself is an isolating material, it might affect ion transport in electronic applications. This effect is important to understand for instance in the design of cellulose-based supercapacitors. To test the ion conductivity through membranes made from cellulose nanofibril (CNF) materials, different electrolytes chosen with respect to the Hofmeister series were studied. The CNF samples were oxidised to three different surface charge levels via 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO), and a second batch was further cross-linked by periodate oxidation to increase wet strength and stability. The outcome showed that the CNF pre-treatment and choice of electrolyte are both crucial to the ion conductivity through the membranes. Significant specific ion effects were observed for the TEMPO-oxidised CNF. Periodate oxidated CNF showed low ion conductivity for all electrolytes tested due to an inhibited swelling caused by the crosslinking reaction.