A comparison of silver nanoparticles made by green chemistry and femtosecond laser ablation and injected into a PVP/PVA/chitosan polymer blend

Abstract

Pristine samples of a polymer blend of polyvinylpyrrolidone (PVP)/ polyvinyl alcohol (PVA)/ chitosan lled with different concentrations of silver nanoparticles (AgNPs) were prepared using the casting method. The samples were then examined using various physical and antibacterial characterization techniques. Characterization studies showed that the blend provides a uniform and controlled distribution of AgNPs inside the polymeric matrix without the addition of any more stabilizers. The mean particle size for green and laser-ablated AgNPs was found to be 50 nm according to transmission electron microscopy (TEM) studies. Fourier transforms infrared (FTIR) studies showed the presence of characteristic main peaks corresponding to the vibrational groups which characterize the prepared samples. The interactions between the AgNPs and the blend were marked by changes in the intensity of vibrational peaks and spectral positions. X-ray diffraction (XRD) con rmed the structural modi cation within the PVP/PVA/chitosan matrix because of AgNPs lling. The change in the absorbance has been studied with the help of measured ultraviolet-visible spectroscopy (UV-Vis.) and therefore the optical band gap was calculated. The lling of AgNPs in the blend shows a broad peak at 427 nm because of the phenomenon of surface plasmon resonance (SPR) and its intensity increases with increasing ller concentration. The blend and the Ag-nanocomposite showed good antibacterial activity and caused a signi cant decrease in microbial growth (Escherichia coli) in 24 hours.

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

“…PVA shows distinctive absorption peaks at 2909 cm −1 as a result of symmetrical CH 2 stretching, 1660 cm −1 from C=C stretching, 1096 cm −1 from CO stretching, and 924 cm −1 from CH 2 rocking [18,23]. Moreover, the distinctive coronene peaks were also seen at 3047 and 3015 cm −1 due to CH stretching and at 1607, 1494, and 1310 cm −1 due to C-C stretching [24].…”

“…The spectra display distinct stretching and bending vibrational modes' bands that correspond to the molecular structure of the produced composites. The FTIR absorption bands' centers of the produced composites are summarized in Table 1; they were assigned based on the published works [18,23,24].…”

Synthesis, Characterization, and Properties of Sulfonated CNT‐Doped Poly(aniline‐co‐carbazole)‐PVA Conductive Films

“…The insertion of P(Ani‐ co ‐Cz) copolymer results in an increase in stress measurements as a result of the stiff backbone of conductive copolymer that was added to the polymeric matrix. [ 32 ] It is clearly distinct that as the nanocomposite is added to the film a distinct shift to higher elongation at break is recorded for either doped film regardless of its nanocomposite load to show that the films can be stretched more without rupture. A profound study on the conductive nanocomposite film of PVA‐P(Ani‐ co ‐Cz)@CNT‐SO 3 H (1%) showed a systematic increase in the modulus, tensile strength, and elongation at break compared to the pristine PVA and PVA‐P(Ani‐ co ‐Cz) films with no nanoparticle in its matrix as tabulated in Table 2 .…”

The Influence of NiO Nanoparticles on Structural, Optical and Dielectric Properties of CMC/PVA/PEDOT:PSS Nanocomposites

“…The spectra of the pure blend show the characteristic absorption bands of PVA at 1373, 1256, and 863 cm −1 as a result of CH2 bending vibration, 2907 cm −1 due to CH 2 symmetrical stretching, and 1086 cm − 1 due to CO stretching [16][17][18][19]. The CMC characteristic peaks were also observed at 1603 cm −1 due to asymmetric COO stretching, and 1419 cm −1 due to CH 2 scissoring [17].…”