A flexible nanogenerator (NG) is fabricated with a poly(vinylidene fluoride) (PVDF) film, where deoxyribonucleic acid (DNA) is the agent for the electroactive β-phase nucleation. Denatured DNA is co-operating to align the molecular -CH2/-CF2 dipoles of PVDF causing piezoelectricity without electrical poling. The NG is capable of harvesting energy from a variety of easily accessible mechanical stress such as human touch, machine vibration, football juggling, and walking. The NG exhibits high piezoelectric energy conversion efficiency facilitating the instant turn-on of several green or blue light-emitting diodes. The generated energy can be used to charge capacitors providing a wide scope for the design of self-powered portable devices.
The present study reports on biogenic-synthesised silver nanoparticles (AgNPs) derived by treating Ag ions with an extract of leaf, a popular Indian medicinal plant found in natural habitation. The progress of biogenic synthesis was monitored time to time using a ultraviolet-visible spectroscopy. The effect of phytochemicals present in including flavonoids, tannins, phenolic compounds and alkaloids on the homogeneous growth of AgNPs was investigated by Fourier-transform infrared spectroscopy. The dynamic light scattering studies have revealed an average size and surface Zeta potential of the NPs as, -39.5 nm and -21.6 mV, respectively. The potential antibacterial and antifungal activities of the AgNPs were evaluated against and. Moreover, their strong antioxidant capability was determined by radical scavenging methods (1,1-diphenyl-2-picryl-hydrazil assay). Furthermore, the AgNPs displayed an effective cytotoxicity against A-431 skin cancer cell line by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay, with the inhibitory concentration (IC) predicted as, 92.2 ± 1.2 μg/ml. The biogenically derived AgNPs could find immense scope as antimicrobial, antioxidant and anticancer agents apart from their potential use in chemical sensors and translational medicine.
24A silver-silica nano composite based geopolymer mortar has been developed by 25 simple adsorption of silver in a suitable amount of colloidal silica suspension for anti-26 bacterial property development. The silver nanoparticles (3-7 nm) were attached on the 27 surface of 20-50 nm sized silica nanoparticle. The silver-silica nano-composite was 28 characterized by Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD) and 29 Energy Dispersive X-ray Spectral analysis. Mechanical strength, durability and mechanistic 30 anti-bacterial activity of the silver-silica nano composite modified geopolymer mortar 31 (GM Ag-Si ) were investigated and compared to nano silica modified geopolymer mortar (GM Si ) 32 and control cement mortar (CM). To accesses the anti-microbial efficacy of the samples, 99% 33 mortality for the Gram positive and Gram negative bacteria were calculated. Minimum 34 Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) values 35 were determined from batch culture. With the addition of 6% (w/w) of silver-silica nano 36 composite in the geopolymer mortar cured at ambient temperature shows substantial 37 improvement in mechanical strength, durability and anti-bacterial property. Reactive Oxygen 38 Species (ROS) generation and cell wall rapture as observed from fluorescence microscopy 39 and Field Emission Scanning Electron Microscopy (FESEM) may be possible reason behind 40 the anti-bacterial efficacy of silver-silica nano composite modified geopolymer mortar.41 42 43 44
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.