Abstract
Abstract
Nanocellulose is an emerging material that needs to be well characterized to control its performance during industrial applications. Gel point (Øg) is a convenient parameter commonly used to estimate the aspect ratio (AR) of cellulose nano/microfibers (CNFs/CMFs), providing critical information on the nanofiber network. However, its estimation requires many sedimentation experiments, tedious and time consuming. In this study, a simpler and faster technique is presented to estimate Øg, based on one or two sedimentation experiments, reducing the experiments by a factor of at least 2.5. Here, this new methodology is successfully validated by using the Øg of different CNF/CMF hydrogels calculated with the traditional methodology, showing an error lower than 7%. The error in the estimation of the AR is lower than 3% in all cases. Furthermore, the two mathematical models currently used to estimate Øg, the smoothing spline and the quadratic fit, are compared and the mathematical assumptions improved.
Graphical abstract
Funder
Ministerio de Economía y Competitividad
Comunidad de Madrid
Universidad Complutense de Madrid
Banco Santander
Australian Research Council, Australian Paper, Carter Holt Harvey, Circa, Norske Skog and Visy for their support through the Industry Transformation Research Hub grant
Publisher
Springer Science and Business Media LLC
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