Abstract
Layered double hydroxides (LDHs) have been widely investigated due to their several applications in the material and biotechnology industries. The combination of silver nanoparticles with biocompatible LDH material can create a new hybrid material with new properties. In this work, biogenic silver nanoparticles (AgNPbio) were associated with Mg-Al LDH to obtain the hybrid material LDH-AgNPbio. The new hybrid material obtained was characterized by X-ray diffractometry (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and Fourier transform infrared spectroscopy (FTIR). LDH was efficient to absorb silver nanoparticles due to an opposite surface charge between AgNPbio (ζ = -13.2 mV) and LDH (ζ = +3.2 mV). Furthermore, AgNPbio was not lixiviated from LDH-AgNPbio, even after five washes, indicating a strong interaction. An important property of this hybrid material was its antimicrobial activity against Staphylococcus aureus and Escherichia coli and absence of cytotoxic effect to fibroblast cell (V79). This hybrid material is an interesting and promising nanobiocomposite for biomedical and cosmetic applications.
Highlights
Layered double hydroxides (LDHs) have been widely studied due to their potential applications in different areas, such as, catalysts, pharmaceuticals, UV stabilizers, adsorbents and others
LDH associated with metallic nanoparticles can be obtained by different methods such as the addition of reducing agent in a LDH/metallic ions dispersion followed by heating at high temperature, by deposition‐p recipitation (DP) and successive calcinations or by simple mixtures of LDH and metallic nanoparticle dispersions.[4,7]
AgNPbio interacted with the LDH surface and was not intercalated among the inorganic layers, since it was observed no significant difference in the interlamellar distance of LDHs without (8.48 Å) and with AgNPbio (8.50 Å), as verified by X-ray powder diffraction (XRD) analysis (Figure 3)
Summary
Layered double hydroxides (LDHs) have been widely studied due to their potential applications in different areas, such as, catalysts, pharmaceuticals, UV stabilizers, adsorbents and others. Biogenic silver nanoparticles (AgNPbio) were associated with Mg-Al LDH to obtain the hybrid material LDH-AgNPbio. An important property of this hybrid material was its antimicrobial activity against Staphylococcus aureus and Escherichia coli and absence of cytotoxic effect to fibroblast cell (V79).
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