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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomass Valorization

Background:

  • Lignin valorization is crucial, requiring understanding its nanoscale architecture.
  • Colloidal lignin particles (CLPs) are promising building blocks, but their surface interactions are poorly understood.
  • Lack of model films with defined CLP-like surfaces hinders fundamental surface studies.

Purpose of the Study:

  • To prepare well-defined and stable thin films from CLPs.
  • To investigate the surface phenomena and interactions of these CLP thin films.
  • To assess the suitability of CLP films for fundamental studies and material interaction testing.

Main Methods:

  • Preparation of uniform CLP thin films on substrates with cationic anchoring polymers.
  • Atomic Force Microscopy (AFM) for visualizing CLP distribution.
  • Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) for quantifying adsorption and detecting changes (swelling, dissolution).

Main Results:

  • Uniform CLP distribution achieved on prepared substrates.
  • QCM-D showed preferential adsorption of cationic lignin onto CLP films, indicating interaction with carboxylic acid-rich surfaces.
  • CLP films demonstrated stability up to pH 8, with some instability at pH 10 and dissolution at pH 12.
  • Particle size influenced adsorption magnitude; similar trends observed for CLPs from different solvent systems.

Conclusions:

  • A practical method for creating well-defined CLP thin films was established.
  • These films are suitable for fundamental surface studies and investigating lignin nanoparticle interactions.
  • The findings support the use of CLP films as a platform for testing lignin nanoparticle stability and interactions in various applications.