Abstract
Nanostructured films of poly(o-ethoxyaniline) (POEA) alternated with cellulose nanofibrils (CnF) were successfully produced by self assembly (SA) at different pH values and investigated by atomic force microscopy and ultraviolet-visible spectroscopy. Results show that it was possible to build up films by alternating POEA and CnF layers with relatively precise architectural control by controlling the number of layers and pH. Film thickness had a dependence on pH which is a combination of the effects of the deposited amount for each POEA layer and the pH at which the absorption of the cellulose nanofibrils was carried out. Comparison of alternated layers of POEA and CnF with multi-immersions of POEA at different pH values, as measured by the ratio between slopes of the straight lines of deposited amount of polymer versus the number of self-assembled layers, shows that alternate deposition at pH 2 has a fourfold increase in the slope. Alternatively, at pH 5, there is no significant difference whether the deposition is alternated (POEA–CnF) or not (POEA).
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One of the authors, Luiz H. C. Mattoso, would like to acknowledge CNPq and Embrapa/Labex program for their support to this research.
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Medeiros, E.S., Mattoso, L.H.C., Bernardes-Filho, R. et al. Self-assembled films of cellulose nanofibrils and poly(o-ethoxyaniline). Colloid Polym Sci 286, 1265–1272 (2008). https://doi.org/10.1007/s00396-008-1887-x
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DOI: https://doi.org/10.1007/s00396-008-1887-x