On the structure of Ag-containing sol-gel bioactive glasses
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Open Ceramics
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Ag-containing bioactive glasses (Ag-BG) have been extensively studied as a bactericidal biomaterial, produced
mainly by the sol-gel method over the last decades. According to the literature, sol-gel-derived Ag-BG may show
metallic or ionic silver species in the glass structure. However, most of these works lack detailed information
about how the addition of silver affects the glass network. In this study, we systematically produced sol-gel
derived 58S glasses containing different quantities of Ag2O (1, 5, and 10 wt%), yielding glasses with different
proportions of silver species (Ag0 or Ag+1). Results from X-ray diffraction and scanning electron microscopy
coupled with energy dispersive spectroscopy (SEM-EDS) evidenced the progressive formation of silver crystals
due to the addition of silver in the glass structure. 29Si and 31P nuclear magnetic resonance and photoelectronic
X-ray spectroscopies evidenced a glass depolymerization caused by Ag1+ addition in the glass structure. On the
other hand, the presence of silver crystals (Ag0) removes the network modifier role of silver, yielding glasses with
higher network connectivity. A possible mechanism to explain the formation of silver crystals was proposed
based on surface nucleation and growth. Finally, we suggest understanding Ag1+ or Ag0 formation as a solution
to design glasses with tuned bactericidal properties.
Como referenciar
BORGES, ROGER; OLIVEIRA, JULIANA S.S.; QUEIROZ, ANTONIA P.; ZAMBANINI, TELMA; HANASHIRO, AKIKO M.; LIMA, NELSON B.; SCHNEIDER, JOSÉ F.; MARCHI, JULIANA. On the structure of Ag-containing sol-gel bioactive glasses: a surface crystal growth of metallic silver removes its network modifier role in the glass structure. Open Ceramics, v. 16, p. 1-10, 2023. DOI: 10.1016/j.oceram.2023.100449. Disponível em: http://repositorio.ipen.br/handle/123456789/34377. Acesso em: 24 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.