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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid and Surface Chemistry

Background:

  • Nanocelluloses, including cellulose nanocrystals (CNCs), possess high surface areas and tunable assembly properties.
  • Understanding solvent effects on CNC organization is crucial for advanced material design.

Purpose of the Study:

  • To investigate the assembly of cellulose nanocrystals (CNCs) in tert-butanol (TBA) and water mixtures.
  • To elucidate the influence of TBA concentration on CNC suspension structure and freeze-dried foam morphology.
  • To explore the potential of TBA as a structuring agent for nanomaterials.

Main Methods:

  • Preparation and characterization of CNC suspensions in varying TBA/water ratios.
  • Rheological measurements to assess suspension viscosity.
  • Analysis of freeze-dried foam morphology and properties.

Main Results:

  • Addition of >30 wt% TBA shifted ordered CNC packing to an isotropic network, disrupting ionic interactions.
  • TBA adsorption to hydrophobic CNC interfaces increased suspension viscosity by 5-fold at 50 wt% TBA.
  • TBA modulated CNC crystal growth during freezing, transforming foam morphology and increasing mechanical strength (3-fold) and surface area (15-fold).

Conclusions:

  • Tert-butanol acts as a potent structuring agent in CNC/water systems.
  • Solvent-mediated control over CNC assembly enables tailored foam properties.
  • This work highlights opportunities for designing nanomaterial systems using solvent mixtures.