Simplification of gel point characterization of cellulose nano and microfiber suspensions

Jose Luis Sanchez-Salvador, M. Concepcion Monte, Carlos Negro, Warren Batchelor, Gil Garnier, Angeles Blanco

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

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: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)6995–7006
Number of pages12
JournalCellulose
Volume28
DOIs
Publication statusPublished - 17 Jun 2021

Keywords

  • Aspect ratio
  • Cellulose nanofibers
  • Characterization
  • CSAPS smoothing spline
  • Gel point
  • Sedimentation

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