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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Novel insights on the physicochemical properties of eumelanins and their DMSO derivatives

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Autor(es):
Albano, Luiz G. S. ; Di Mauro, Eduardo ; Kumar, Prajwal ; Cicoira, Fabio ; Graeff, Carlos F. O. ; Santato, Clara
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: Polymer International; v. 65, n. 11, p. 1315-1322, NOV 2016.
Citações Web of Science: 8
Resumo

The biopigment eumelanin, ubiquitous in flora and fauna, is made up of chemically heterogeneous macromolecules based on the 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid building blocks. The exciting possibility of designing eumelanin-based technologies for bioelectronics and sustainable electronics has to be properly assessed by gaining insights on the charge transfer and charge carrier transport in the pigment, preferably in film form, easily amenable to devices. In this work, we report a study on the electrochemical behaviour of films of eumelanin and its derivatives synthesized in dimethyl sulfoxide (DMSO eumelanins) in different aqueous electrolytes, with different chemical compositions and pH. DMSO eumelanins feature an improved solubility in the solvent DMSO, of relevance for processing purposes. The voltammetric currents are higher at relatively low pH (5.5), as expected considering the well-established proton transport properties of the biopigment. Raman spectroscopy and atomic force microscopy performed on eumelanin films were combined with thermogravimetry with the aim of advancing knowledge on the molecular and supramolecular features of synthetic commercially available eumelanin, DMSO eumelanins as well as natural eumelanin (Sepia melanin). The results collected permit unprecedented insights on the physicochemical properties of eumelanin. (c) 2016 Society of Chemical Industry (AU)

Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 14/25332-9 - Transistores bioprotônicos utilizando filmes finos de eumelanina
Beneficiário:Luíz Gustavo Simão Albano
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto