In the present study, silver (Ag) and Ag-zinc oxide (ZnO) composite nanoparticles (NPs) were synthesised and studied their wound-healing efficacy on rat model. Ultraviolet-visible spectroscopy of AgNPs displayed an intense surface plasmon (SP) resonance absorption at 450 nm. After the addition of aqueous Zn acetate solution, SP resonance band has shown at 413.2 nm indicating a distinct blue shift of about 37 nm. X-ray diffraction analysis Ag-ZnO composite NPs displayed existence of two mixed sets of diffraction peaks, i.e. both Ag and ZnO, whereas AgNPs exhibited face-centred cubic structures of metallic Ag. Scanning electron microscope (EM) and transmission EM analyses of Ag-ZnO composite NPs revealed the morphology to be monodispersed hexagonal and quasi-hexagonal NPs with distribution of particle size of 20-40 nm. Furthermore, the authors investigated the wound-healing properties of Ag-ZnO composite NPs in an animal model and found that rapid healing within 10 days when compared with pure AgNPs and standard drug dermazin.
The current research study focuses on biosynthesis of silver nanoparticles (Ag NPs) for the first time from silver acetate employing methanolic root extract of Diospyros assimilis. The UV-Vis absorption spectrum of biologically synthesised nanoparticles displayed a surface plasmon peak at 428 nm indicating the formation of Ag NPs. The influence of metal ion concentration, reaction time and amount of root extract in forming Ag NPs by microscopic and spectral analysis was thoroughly investigated. Structural analysis from transmission electron microscopy confirmed the nature of metallic silver as face-centered cubic (FCC) crystalline with an average diameter of 17 nm, which correlates with an average crystallite size (19 nm) calculated from X-ray diffraction analysis. Further, the work was extended for the preliminary examination of antimicrobial activity of biologically synthesised Ag NPs that displayed promising activity against all the tested pathogenic strains.
The health hazards generated from textile and dye industries wastewater which are most carcinogenic and they poses a danger to human and aquatic biota. The present work investigates the degradation of dye pollutants such as Eosin yellow (EY) and Brilliant green (BG) under visible light irradiation using SnO 2 /Fe 2 O 3 /Ag nanocomposite. This nanocomposite was prepared by hydrothermal route and characterized by various instrument techniques like XRD, FTIR, FESEM, EDS, HRTEM, UV-Vis DRS, PL and UV-Vis spectrophotometer for determine its crystalline phase, morphology, bandgap and photocatalytic efficiency. The photocatalytic activity of nanocomposite was tested on both dyes EY and BG under visible light irradiation and the experimental results declared that this composite shown better photocatalytic activity in basic solution degraded 93% of BG and 95% of EY in 75 min and 60 min, respectively under the normalised conditions such as basic pH, 30 mg catalyst dose and 10 mg/L of dye solution concentration without any oxidants such as H 2 O 2. This is due to lower bandgap energy of SnO 2 /Fe 2 O 3 /Ag nanocomposite (1.78 eV) and thus shows the red shift, making it active in the visible region, resulting in higher photocatalytic activity. This was proved by compare the photocatalytic efficiency with SnO 2 and SnO 2 /Fe 2 O 3 shown lesser photocatalytic degradation efficiency over EY and BG under visible light irradiation.
A water-soluble copolymer of maleic acid (MA) and sodium methallyl disulfonate (SMADS) were synthesized by aqueous solution free radical polymerization and evaluated as scale inhibitor for barium sulfate. The copolymer was characterized by FTIR, HNMR, GPC and HPLC results verified the structure of MA-SMADS copolymer and molecular weight was about 1050 g/mol. The experimental results indicates that the optimal conditions for copolymer synthesis are 105 °C, monomer dosage 30% (wt) and sodium persulfate (NaPS) dosage 7%. The inhibition performance of polymer on barium sulfate was evaluated through static bottle test and the static inhibition rate on barium sulfate can reach up to 98%. Consequently, the evaluation criteria was carried out by dynamic scale loop test.
Using aqueous solution free radical polymerization with glacial acrylic acid (GAA), maleic anhydride (MA) and sodium methallyl disulfonate (SMADS), a novel linear polycarboxylate dispersant was synthesized for ceramics. Dispersant linear structural characterization was done by FTIR, 1 H NMR, HPLC and GPC, and the ratio of monomers was determined using an orthogonal experiment. This research is focused on the effects of polymerization temperature, monomer mole ratios and dosage of initiator on ceramic slurry viscosity with linear polycarboxylate dispersant for ceramic dosage rate of 0.30% (based on dry slurry), all of which were investigated by single factor test. The best polymerization conditions for linear GAA-MA-SMADS are when n(AA) : n(MA) : n(SMADS) equals 3.0 : 1.0 : 0.5, the molecular weight of the polymer is 4600 daltons, the initiator sodium persulfate accounts for 7% of the total mass of polymerized monomers, the polymerization temperature is 90°C and the reaction time is 2 h. The ceramic body slurry viscosity drops from 820 mPa•s to 46 mPa•s when the concentration of the polycarboxylate dispersant is 0.30%.
In this research, linear polycarboxylate of glacial acrylic acid (GAA), maleic acid (MA) and sodium methallylsulfonate (SMAS) dispersant polymer as a water reducer was synthesized for ceramic applications by using redox free radical initiation system consisting sodium persulfate (Na2S2O8) and sodium hypophosphite (Na2H2PO2) through aqueous solution free radical polymerization. The structural characterizations were done using FT-IR and 1 H NMR. The molecular weight of polymer was analyzed using GPC and residual monomer levels in final product were measured with HPLC. Measured the ceramic flow times, viscosities at dispersant dosage rate 0.30 % (dry slurry based) and the results indicated that linear polycarboxylate showed a good performance at the mol ratios of GAA:MA:SMAS = 60:20:20, ratios of initiator (Na2S2O8) and chain transfer agents (Na2H2PO2) 2:6 % at, 85 ºC polymerization temperature and 2 h reaction time.
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