Electrochemical single-step obtention and characterization of a biomimetic TiO 2 -HA NTs covered by chitosan
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Electrochemical single-step obtention and characterization of a biomimetic TiO2-HA NTs covered by chitosan Rhauane Almeida Galvão1, Larissa Agostinho de Santa-Cruz1, Paloma Bantim Barreto1, Marla Karolyne dos Santos Horta2, Antonio Marcos Helgueira de Andrade3, Francisco José Moura2, Marilza Sampaio Aguilar4, Suzana Bottega Peripolli5, José Brant de Campos5, Isabel Renata de Souza Arruda6, Giovanna Machado6,a) 1
Laboratório de Nanomateriais (LmNano2), Centro de Tecnologias Estratégicas do Nordeste (CETENE), Recife 50740-545, Brazil; and Centro de Ciências Exatas e da Natureza (CCEN), Universidade Federal de Pernambuco (UFPE), Recife 50740-545, Brazil Departamento de Engenharia Química e Materiais, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro 22451-045, Brazil 3 Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre 91501-970, Brazil 4 Departamento de Engenharia, Universidade Estácio de Sá, Rio de Janeiro 20261-902, Brazil 5 Faculdade de Engenharia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro 20550-013, Brazil 6 Laboratório de Nanomateriais (LmNano2), Centro de Tecnologias Estratégicas do Nordeste (CETENE), Recife 50740-545, Brazil a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 1 November 2018; accepted: 8 January 2019
Obtention of titanium (Ti)- and titanium dioxide (TiO2)–based nanocomposites is of great interest for biological nanomaterial applications, including for dental implants. Their mechanical properties can be improved by use of hydroxyapatite (HA) and chitosan through their biological anchorage with osseointegration and antibacterial activity. Electrochemical methods were chosen to obtain these composites in a quick and controllable way. In this work, electrochemical synthesis in one (alternated potential) or two steps (alternated or constant potential) was successfully applied. The single step (SS) obtained TiO2 + HA sample had different optical properties, as shown using ultraviolet–visible spectrometry, and the HA phase formation was proved using Raman spectroscopy. Thereby, SS_TiO2 + HA increased the corrosion resistance of titanium in artificial saliva medium, as shown by linear polarization and electrochemical impedance spectroscopy results. When using chitosan, the samples showed two corrosion interfaces, indicating its dissolution in human medium. These results indicate that the samples are excellent materials for dental implants.
Introduction The development of biomimetic materials founded on nanotechnology is a way to approximate biological systems once these hierarchical compounds can be taken from the nanoscale to the macroscale. When applied to an osseous implant, which is a tissue compound formed by inorganic lattices (osseous apatite) connected to organic compounds (collagen and other proteins) [1], the biomaterial’s success can be attributed to the mechanical anchorage (geometry) and the biological anchorage (surface topography, chemical composition, wettability, and sur
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