Abstract
SiO 2/cellulose nanocomposites were prepared using two distinct methodologies: deposition of morphological well-defined SiO 2 nanoparticles at the fibres surfaces via polyelectrolytes assembly (layer-by-layer approach, LbL) and the synthesis of SiO 2 nanoparticles via tetraethoxysilane (TEOS) hydrolysis in the presence of cellulose fibres. Although both methods were able to produce SiO 2/cellulose composites, their final morphological properties strongly depend on the synthetic strategy employed. Whereas in the LbL approach cellulosic fibres covered with discrete spherical SiO 2 nanoparticles have been obtained, for the in situ synthesis of SiO 2, nanocomposites consisting predominantly on fibres homogeneously coated with a SiO 2 film have been obtained. Both methodologies induced a significant decrease in the water uptake capacity of cellulose fibres.
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