In this work, silver–copper oxide (Ag–CuO) nanoparticles were incorporated into polyethylene oxide/carboxymethyl cellulose (PEO/CMC) blend to tailor its structural, dielectric, and electrical properties. A constant content of Ag nanoparticles of 0.3
Flexible PVDF-based electrolyte films incorporating AgNO3/LiCl nanofillers were prepared via a solution casting process. Hybrid salt additives were introduced at varying concentrations (0.5, 1.5, and 3.0 wt.%) into the PVDF matrix to assess their impact on the structural, optical, and electrical properties of the composite films. XRD analysis confirmed a decrease in crystallinity from 36.32% in pure PVDF to 17.95% at 3.0 wt.% loading, indicating increased amorphous content conducive to ionic mobility. FTIR spectroscopy revealed strong interactions between nanofillers and the polymer, with shifts and broadening of characteristic bands. UV-Vis spectroscopy showed enhanced absorption in the UV-Visible range and a notable decrease in optical bandgaps, from 3.51 eV (direct) in pure PVDF to 2.53 eV in the 3.0 wt.% sample. AC conductivity measurements revealed a significant increase in conductivity with filler content, particularly at high frequencies, attributed to enhanced charge transport via hopping mechanisms. Dielectric analysis showed a marked increase in dielectric constant (up to 7.4 x 104 at 1.5 wt.%) and dielectric loss at low frequencies. Electric modulus and Cole-Cole plots confirmed improved relaxation behavior and reduced bulk resistance. These results demonstrate that PVDF- AgNO3/LiCl nanocomposites are promising candidates for high-performance solid polymer electrolytes in energy storage and optoelectronic applications.
This work investigates the synergistic impact of iron oxide (Fe₂O₃) nanorods and molybdenum trioxide (MoO₃) nanobelts incorporated into a polyvinyl alcohol/hydroxypropyl methylcellulose (PVA/HPMC) blend via solution casting. The structure–property relationships of PVA/HPMC/Fe₂O₃–MoO₃ nanocomposites were analyzed using XRD, FTIR, UV–Vis spectroscopy, and electrical/impedance measurements. Structural analyses (XRD, FTIR) revealed reduced PVA/HPMC blend crystallinity and enhanced interfacial interactions, confirming effective integration of Fe₂O₃–MoO₃ nanofillers. Optical studies showed increased absorption, a bathochromic shift, and the appearance of a ligand-to-metal charge-transfer band, accompanied by reduced direct and indirect bandgaps due to defect-induced localized states and intensified interfacial charge transfer. Electrical and dielectric measurements indicated significant improvements in AC conductivity, charge transport, and dielectric constant, with the highest value ( 908) achieved at 2.00 wt
New transition metal chelates derived from eco-friendly synthesized 4-amino-5-mercapto-1,2,4-triazolylhydrazonoindolin-2-one (H2TIS) have been separated with Cu(II), Mn(II), Hg(II), and V(IV)O cations. Structural characterization was elucidated via CHN elemental microanalysis, UV-Visible, FT-IR, XRD, 1H/13C NMR, MS, EPR, magnetic moment, TG/DTA and molar conductivity. The hydrazone ligand revealed either mononegative or neutral bidentate chelation. The complexes [Hg(H2TIS)2Cl2].2H2O and [Mn(HTIS)(OAc)(H2O)2].H2O presented octahedral geometries while [VO(H2TIS)SO4] and [Cu(H2TIS)Cl2].H2O existed in square pyramidal and square planar arrangements, respectively. These coordination modes and geometries were confirmed via spectral data and optimized using Gaussian software. Cyclic voltammetry and Molar ratio clarified the stoichiometry and the effect of ligand coordination on electrochemistry of the metal cations. Antimicrobial assays pointing Staphylococcus aureus, Escherichia coli and Candida albicans showed significant activity superior that of the free ligand. Furthermore, all compounds demonstrated promising cytotoxic effects against HepG-2 hepatocellular carcinoma cell line. ABTS antioxidant assay and DNA-binding tests showed acceptable results and th molecular docking exposed strong associations with protein receptors 1YWN and 8EC1, relating to DNA interactions and antitumor activity.
In this study, the polymer nanocomposites (PNC) films, which consist of chitosan (CS), poly (vinyl) pyrrolidone (PVP), and iron vanadate (FeVO4) nanoparticles (FVO NPs) were prepared utilizing the solution casting method. Numerous investigations, including structural, vibrational, electrical, dielectric, and optical tests, demonstrate promising properties of the generated polymer nanocomposites. Up to a 1.5 weight% FVO concentration, the sample's amorphous character improved, according to the Xray diffraction (XRD) examination. The existence of intermolecular interactions in the nanocomposite was confirmed by Fourier transform infrared spectroscopy (FTIR) and UV-Visible spectroscopy. Experimental results showed that the nanocomposites' optical bandgap decreased as the FVO concentration grew. The investigative values of the ε', ε'', and σac show notable differences in frequency. It is found that the values of the ε' and ε'' rise with frequency. It is shown that when the frequency increases, so does the σac. The σac value increased with frequency, reaching 4.14 × 10- 6 S·cm- 1 at 104 Hz from 5.42 × 10- 10 S·cm- 1 at 100 Hz. An increase in σac values is observed when the loading of FVO NPs is increased. Dielectric analyses showed that the CS/PVP/1.2%FVO nanocomposite sample had the best boost. Additionally, the energy density rose from 4.2 × 10- 7 J/m3 for CS/PVP to 1.35 × 10- 6 J/m3 for CS/PVP/1.2%FVO. The results show that the CS/PVP/FVO films can be used in energy storage applications because of their dielectric properties, which are successfully improved by increasing the FVO concentration.
