Abstract
Ag nanoparticles (NPs) were synthesized in formic acid aqueous solutions through chemical reduction. Formic acid was used for a reducing agent of Ag precursor and solvent of gelatin. Silver acetate, silver tetrafluoroborate, silver nitrate, and silver phosphate were used as Ag precursors. Ag+ ions were reduced into Ag NPs by formic acid. The formation of Ag NPs was characterized by a UV-Vis spectrophotometer. Ag NPs were quickly generated within a few minutes in silver nitrate (AgNO3)/formic acid solution. As the water content of formic acid aqueous solution increased, more Ag NPs were generated, at a higher rate and with greater size. When gelatin was added to the AgNO3/formic acid solution, the Ag NPs were stabilized, resulting in smaller particles. Moreover, gelatin limits further aggregation of Ag NPs, which were effectively dispersed in solution. The amount of Ag NPs formed increased with increasing concentration of AgNO3 and aging time. Gelatin nanofibers containing Ag NPs were fabricated by electrospinning. The average diameters of gelatin nanofibers were 166.52 ± 32.72 nm, but these decreased with the addition of AgNO3. The average diameters of the Ag NPs in gelatin nanofibers ranged between 13 and 25 nm, which was confirmed by transmission electron microscopy (TEM).
Highlights
The application of nano-scale materials and structures, usually ranging from 1 to 100 nanometers, is an emerging area of nanoscience and nanotechnology
In the chemical reduction method, Ag precursor was dissociated from Ag+ ions in aqueous solution, and Ag+ ions were reduced to Ag0 (Ag NPs) by a reducing agent
The Ag precursor was dissociated from Ag+ ions in aqueous solution
Summary
The application of nano-scale materials and structures, usually ranging from 1 to 100 nanometers (nm), is an emerging area of nanoscience and nanotechnology. A number of methods have been used to generate Ag NPs from Ag ions in electrospun fibers, including chemical reduction by hydrazinium hydroxide or DMF; photocatalytic reduction by TiO2 NPs; photoreduction by UV irradiation; and simple heat treatment. In these methods, the as-formed Ag NPs are prevented from further growth and agglomeration (i.e., stabilized) by polymer matrix [62,63,64,65,66,67,68,69]. Gelatin nanofibers containing Ag NPs were prepared by electrospinning to explore the nanofibrous scaffolds for burn wound dressing Their morphology was investigated by field emission scanning electron microscopy (FE-SEM). Ag NPs in gelatin nanofibers were observed using a transmission electron microscope (TEM) and confirmed by energy dispersive spectroscopy (EDS)
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