Maximizing surface reactivity: The impact of electrochemical oxidation as a polydopamine modification step

Autor(es)

Teixeira, Jean Valdir Uchoa ; Dias, Leonardo Francisco Gonsalves ; Guerra, Nayrim Brizuela ; Capelin, Guilherme Ribeiro ; Mastelaro, Valmor Roberto ; Lisboa-Filho, Paulo Noronha

• Tipo de documento: Artigo Científico
• Fonte: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 706, p. 14-pg., 2025-02-05.

Resumo

Melanin-based materials are highly versatile and widely utilized across various industries, thanks to their customizable surface properties and excellent biocompatibility. Dopamine, a well-studied precursor, has the remarkable ability to self-oxidize and form melanin-like compounds. This molecule can be tailored using cations during the oxidation process or via the chelation of hydroxyl groups in the final material. In order to explore the adaptability of dopamine-based melanin materials, our research focuses on producing particles using an innovative double-step process. The first oxidation is catalyzed by Y 3 + in an electrochemical process, followed by further cyclization in a basic medium. We examined the resulting products to gauge the impact of the process on the final molecular arrangement and chelation capacity by utilizing Fe2+ as a cation probe. Surface reactivity was assessed using voltammetry techniques and electrochemical impedance spectroscopy. The results clearly indicate significant improvements in the molecular arrangement, demonstrating that the double-step process delivers higher material stability and superior surface reactivity compared to the conventional alkali self-oxidation method. (AU)

• Processo FAPESP: 21/09207-3 - Fabricação de transistores eletroquímicos a base de melanina dopada com condutividade iônica e eletrônica melhorada
• Beneficiário: Nayrim Brizuela Guerra
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs