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Systematic modification of fiber external surfaces and their lumen was demonstrated by using layer-by-layer (LbL) nanoassemblies via alternate adsorption of positive and negative polyelectrolytes. In the best case scenario of 1:1 mixture of positively and negatively charged LbL-treated pulp, we doubled the paper tensile strength. LbL-coating with multilayers of anionic polythiophene (PEDOT-PSS) in alternation with polycations resulted in conductivity of 5x10-3 Scm-1 for unbeaten and 10 Scm-1 for beaten softwood fibers. Fiber conductivity was proportional to the number of deposited PEDOT-PSS monolayers. Fibers were also coated with organized multilayers of nanoparticles (50-nm diameter TiO2, SiO2, and tubule halloysite) with controlled loading in the range of 0.5 - 3 wt %.
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Layer-by-Layer Nanocoating on Lignocellulose Fibers: Conductive Polymers and Nanoparticles, 2006 Int