Electrocontrolled Swelling and Water Uptake of a Three-Dimensional Conducting Polypyrrole Hydrogel

Autor(es)

Antonio, Jadielson L. ; Hofler, Lajos ; Lindfors, Tom ; Cordoba de Torresi, Susana I.

• Tipo de documento: Artigo Científico
• Fonte: CHEMELECTROCHEM; v. 3, n. 12, p. 2146-2152, DEC 2016.
• Citações Web of Science: 6

Resumo

Polypyrrole 3D hydrosponges of tubular structure were synthesized and electrochemically characterized. The Fourier transform infrared attenuated total reflection (FTIR-ATR) spectroscopy technique was employed to study the water uptake of the hydrosponges under different conditions. This technique presents several advantages over conventional swelling measurements due to its specificity that allows analyzing the kinetics of water uptake at the molecular level. In combination with mathematical modeling, FTIR-ATR spectroscopy also enables the calculation of the water diffusion coefficients in the hydrogels. The experimental setup also allows electroswelling of the hydrosponges to be studied. The results presented herein are complementary to those obtained with the electrochemical quartz crystal microbalance with dissipation (EQCM-D) technique and make it possible to determine the actual role played by water in the ionic exchange occurring in conducting polymers during their redox processes. Whereas EQCM-D shows the whole mass change in the film provoked by injection/ejection of ions and solvent molecules, FTIR-ATR spectroscopy follows water flux only, which thus allows separation of the solvent contribution. (AU)

• Processo FAPESP: 13/08370-1 - Estudo cinético do intumescimento de hidro-esponjas de polipirrol em diferentes meios aquosos utilizando a técnica FTIR_ATR
• Beneficiário: Jadielson Lucas da Silva Antonio
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 10/17511-0 - Hidrogéis de polímeros condutores com potencial aplicação na remoção de metais pesados em águas superficiais e solos
• Beneficiário: Jadielson Lucas da Silva Antonio
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto