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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Probing cellulose-solvent interactions with self-diffusion NMR: Onium hydroxide concentration and co-solvent effects.

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  • 1MED-Mediterranean Institute for Agriculture, Environment and Development, Universidade do Algarve, Faculdade de Ciências e Tecnologia, Campus de Gambelas, Ed. 8, 8005-139 Faro, Portugal; FSCN Research Center, Surface and Colloid Engineering, Mid Sweden University, SE-851 70 Sundsvall, Sweden.

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Researchers measured molecular diffusion in cellulose solutions using NMR. Results show tetrabutylammonium hydroxide (TBAH) ions bind to cellulose, influencing chain interactions and potentially hindering dissolution.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Materials Science

Background:

  • Microcrystalline cellulose (MCC) dissolution is crucial for its applications.
  • Understanding solvent-solute interactions in cellulose solutions is key to controlling its properties.
  • Aqueous tetrabutylammonium hydroxide (TBAH) is a promising solvent system for cellulose.

Purpose of the Study:

  • To investigate the molecular self-diffusion coefficients of cellulose solutions.
  • To quantify the binding of ions and solvent molecules to cellulose.
  • To elucidate the interaction mechanisms between cellulose, TBAH, and co-solvents.

Main Methods:

  • Pulsed field gradient stimulated echo Nuclear Magnetic Resonance (NMR) measurements were employed.
  • Solutions of microcrystalline cellulose in TBAH (aq) and TBAH (aq)/DMSO mixtures were analyzed.
  • A two-state model was used to estimate binding parameters.

Main Results:

  • Self-diffusion coefficients were determined for cellulose in various solvent compositions.
  • The average number of TBA+ ions bound per anhydroglucose unit (AGU) ranged from 0.5 to 2.3.
  • The fraction of bound molecules (Pb) for TBA+, DMSO, and water increased with cellulose concentration.

Conclusions:

  • TBAH interacts with ionized hydroxyl groups on cellulose, forming a TBA+ counterion sheath.
  • This interaction leads to steric hindrance between cellulose chains, impacting dissolution.
  • The findings provide insights into the mechanism of cellulose dissolution in TBAH-based systems.