Interactions between inorganic nanoparticles and cellulose nanofibrils |
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Authors: | Tiina Nypel? Hanna Pynn?nen Monika ?sterberg Jouni Paltakari Janne Laine |
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Institution: | (1) Department of Forest Products Technology, Aalto University School of Chemical Technology, P.O. Box 16300, 00076 Aalto, Finland;(2) LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland |
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Abstract: | Nanofibrillated cellulose (NFC) is increasingly utilized in materials and biomedical applications consequently increasing
interest in the modification of its surface properties. Besides modification using polyelectrolytes and polysaccharides, NFC
can be combined with solid particles enabling formation of fibril network loaded with particles. Use of particles enabling
easy functionalization could be beneficial for the development of hybrid structures, and lead to preparation of nanocomposites
and functional materials. In order to explore interactions related to preparation of such structures, the interactions between
nanosized precipitated calcium carbonate (nanoPCC) and nanoclay particles and NFC were examined by observing adsorption of
the particles on NFC substrate using a quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy
(AFM) imaging. By a treatment with carboxymethylated cellulose (CMC), the anionicity of the NFC substrate could be increased,
providing an additional tool to affect the interplay between NFC and the inorganic particles. For slightly cationic nanoPCC
particles an increase in the anionicity of the NFC by the CMC treatment increased the affinity, while the opposite was true
for anionic nanoclay. Additionally, for interactions between nanoclay and NFC, dispersion stability was an important factor.
QCM-D was successfully used to examine the adsorption characteristics of nanoparticles although the technique is commonly
used to study the adsorption of thin polymer layers. Distinct adsorption characteristics were observed depending on the nanoparticle
used; nanoclay particles deposited as a thin layer, whereas nanoPCC particles formed clusters. |
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