Self-assembled films of cellulose nanofibrils and poly(<Emphasis Type="Italic">o</Emphasis>-ethoxyaniline) |
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Authors: | Eliton S Medeiros Luiz H C Mattoso Rubens Bernardes-Filho Delilah F Wood William J Orts |
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Institution: | 1.United States Department of Agriculture, Bioproduct Chemistry and Engineering Unit,Western Regional Research Center,Albany,USA;2.Laboratório Nacional de Nanotecnologia para o Agronegócio,Embrapa Instrumenta??o Agropecuária,S?o Carlos,Brazil |
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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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Keywords: | Cellulose nanofibrils Poly(o-ethoxyaniline) Conducting polymers Self-assembly |
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