Abstract
Polyvinylpyrrolidone (PVP) is used in a wide variety of applications because of its unique chemical and physical features, including its biocompatibility and low toxicity. In this study, hollow PVP/silver nanoparticle (PVP/Ag NP) composite fibers were synthesized. Stable, spherical Ag NPs, with an average size of 14.4 nm, were produced through a facile sonochemical reduction method. A small amount of starch as a potent reducing and stabilizing agent was used during the reduction of Ag ions to Ag NPs. The fabricated Ag NPs were then added to a 10 wt% PVP-dichloromethane (DCM) solution, which was utilized as an electrospinning feed solution under a dense carbon dioxide (CO2) environment at 313 K and 5 MPa and an applied voltage of 15 kV. The dense CO2 enabled rapid extraction of DCM from the PVP-Ag NPs-DCM solution, which was then dissolved into PVP/Ag NPs, resulting in a hollow structure. Scanning electron microscopy, Fourier-transform infrared (FT-iR) spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses, and thermogravimetric analysis (TGA), were used to characterize the electrospinning products.
Highlights
Academic Editor: Francesco GalianoSilver nanoparticles (Ag NPs) have been used in a wide variety of applications, such as biochemical sensing [1], antibacterial coatings [2], and catalysis [3], because of their unique physicochemical properties, which differ from those of their bulk counterparts
The intensity of the peak at 405 nm decreased with increasing ultrasonic frequency, which implies that the formation rate of Academic Editor: Francesco GalianoSilver nanoparticles (Ag NPs) in the colloidal solution decreased with increasing frequency [30]
Electrospinning of PVP fibers with different PVP concentrations (6, 8, and 10 wt%) at 12–18 kV was investigated under room conditions and dense CO2 environment
Summary
Silver nanoparticles (Ag NPs) have been used in a wide variety of applications, such as biochemical sensing [1], antibacterial coatings [2], and catalysis [3], because of their unique physicochemical properties, which differ from those of their bulk counterparts They have been synthesized through numerous methods, such as photochemical methods [4], laser ablation [5], chemical reduction [6], and electrochemical techniques [7]. Ozawa et al [24] have successfully produced the hollow PVP-TiO2 NPs (titanium dioxide nanoparticles) composite fibers. The properties of PVP, such as high solubility in water and organic solvents, low toxicity, excellent film-forming capabilities, and good binding characteristics, make them suitable for the electrospinning process. More Ag NPs were exposed on the surface, thereby enhancing the antibacterial characteristics of the composite fibers [27]
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