The Use of Sedimentation for the Estimation of Aspect Ratios of Charged Cellulose Nanofibrils

Onyianta, Amaka Joy; Williams, Rhodri

Abstract

In this study, the aspect ratios of carboxymethylated and TEMPO-oxidised cellulose nanofibrils (CNF) were estimated by gel point analysis using a sedimentation approach. The flocculation and subsequent sedimentation of the CNF aqueous suspensions, which were stabilised by negative repulsive forces, were made possible after screening in concentrated salt media. The aspect ratios of the CNFs were then calculated from the linear fit (gel point) of the plot of concentration of the CNFs against the relative sediment height, using the crowding number theory.

Citation

Onyianta, A. J., & Williams, R. (2018). The Use of Sedimentation for the Estimation of Aspect Ratios of Charged Cellulose Nanofibrils. In R. Fangueiro, & S. Rana (Eds.), Advances in Natural Fibre Composites (195-203). https://doi.org/10.1007/978-3-319-64641-1_17

• Conference Name: 3rd International Conference on Natural Fibers ICNF 2017
• Conference Location: Braga, Portugal
• Start Date: Jun 21, 2017
• End Date: Jun 23, 2017
• Acceptance Date: Mar 15, 2017
• Online Publication Date: Oct 25, 2017
• Publication Date: 2018
• Deposit Date: Nov 21, 2017
• Publisher: Springer
• Pages: 195-203
• Book Title: Advances in Natural Fibre Composites
• Chapter Number: 10
• ISBN: 9783319646404; 9783319646411
• DOI: https://doi.org/10.1007/978-3-319-64641-1_17
• Keywords: Cellulose nanofibrils, Carboxymethylation, TEMPO-oxidation, aspect ratio, sedimentation,
• Public URL: https://doi.org/10.1007/978-3-319-64641-1_17