Interactions of inorganic nanoparticles of silica, calcium carbonate and clay with nanofibrillated cellulose were examined. Layer formation was investigated by observing adsorption of the calcium carbonate and clay nanoparticles on to a nanofibrillated cellulose (NFC) substrate. The particles had a distinct shape and charge, affecting the adsorption behavior as well as the properties of the formed layer. Dispersion stability was noted to be a prerequisite for a controlled layer formation. By adsorption of carboxymethylated cellulose, the anionicity of the NFC substrate could be increased, providing an additional tool to affect the interplay between NFC and the nanoparticles. The silica nanoparticles were utilized in a layer-by-layer assembly with a cationic polyelectrolyte on the NFC substrate. The silica nanoparticle assembly was compared to sequential adsorption of NFC and the cationic polyelectrolyte. The properties of the formed layers were affected by the nanoparticle interactions and by the size and shape of the particles.

Interactions of inorganic nanoparticles and cellulose nanofibrils

243rd National Meeting (2012)

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