Abstract
In this work not only colloids of poly(acrylic acid) (PAA) embedded with silver nanoparticles (Ag-NPs) but thin films (10 nm) also were deposited using electrospray deposition technique (ESD). A mixture of sodium borohydride (NaBH4) and ascorbic acid (AA) were utilized to reduce the silver ions to generate Ag-NPs in the PAA matrix. Moreover, sodium tricitrate was used to stabilize the prepared colloids. The obtained colloids and films were characterized using UV-visible, transmission electron microscopy (TEM). UV-Vis results reveal that an absorption peak at 425 nm was observed in presence of PAA-AgNO3-AA-citrate-NaBH4. This peak is attributed to the well-known surface plasmon resonance of the silver bound in Ag-NPs, while the reduction was rendering and/or inhibiting in absence of the AA and citrate. FTIR spectroscopy was used to study the mechanism of the reaction process of silver nitrate with PAA. TEM images showed the well dispersion of Ag-NPs in the PAA matrix with average particle size of 8 nm. The antimicrobial studies showed that the Ag-NPs embedded in the PAA matrix have proven to have a significant antimicrobial activity againstE. coli,B. subtilis, andC. albicans.
Highlights
Surface contamination by pathogenic bacteria, viruses, and fungi is a problem that acquired community contribution to solve it
The antimicrobial activities of poly(acrylic acid) (PAA)/Ag nanocomposites deposited onto Si-wafer substrate by electrospray deposition technique (ESD) technique were performed using disc diffusion agar technique against Gram negative bacteria Escherichia coli (E. coli), Gram positive bacteria Bacillus subtilis (B. subtilis), and fungi Candida albicans (C. albicans)
Reduction of Ag+ into AgNPs proceeds by electrons transfer from the reducing agent to the silver ions leading to the formation of silver atoms (Ag) and it was usually monitored by visual inspection and ultraviolet and visible regions (UV-Vis) spectroscopy
Summary
Surface contamination by pathogenic bacteria, viruses, and fungi is a problem that acquired community contribution to solve it. In situ reduction of silver ions produces polymer/Ag-NPs composites [4]. This method can be used to prepare Ag-NPs which are uniform in shape and size, are convenient in use, and have a pronounced antibacterial effect. Poly(acrylic acid)/silver nanocomposite successfully will be prepared through a novel synthetic route by utilizing chemical reduction method; sodium borohydride is used as a strong reducing agent in presence of sodium tricitrate as a surfactant. This pathway will be achieved through simple steps, inexpensive precursors. The prepared nanocomposite films might potentially be used for surface modifications of medical devices
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