ABSTRACT In recent years, nanotechnological research has introduced hybrid nanofluids, which are advanced fluids with augmented thermal properties that give better results than regular nanofluids. The thermal transfer characteristics of the Falkner-Skan flow of MgO-MoS2/Engine oil hybrid nanofluid induced by a wedge surface with thermophoresis and Brownian motion are numerically investigated. The main objective of this research is to examine the augmented thermal transport behavior of Casson and Carreau hybrid nanofluids. The equations that arise are solved by adopting the bvp5c scheme in MATLAB software. Plots and numerical values illustrate the stimulus of various pertinent parameters on the flow-determining factors such as velocity, thermal and concentration fields, wall friction, energy, and mass transports. The rate of energy transport in the Carreau hybrid nanofluid is significantly larger than that of the Casson hybrid nanofluid. The implication of 5% volume of MgO-MoS2 nanoparticles enhances the rate of thermal transport by 53% in the Carreau fluid and 47% in the Casson fluid, respectively. This research holds potential for applications in geothermal energy systems.

A numerical investigation is performed to scrutinize the enhanced thermal transmission of Carreau nanoliquid above an incessantly moving thin needle in the occurrence of nonuniform heat rise/fall effects. The arising system of nonlinear coupled equations is exercised numerically by employing a suitable numerical scheme, i.e. bvp5c Matlab solver. The prime motive of this research is to determine the effectual thermal conductivity of the nanoliquid by using Maxwell/Xue models to achieve enhanced energy transmission. The stimulus of pertinent constraints upon the flow factors, viz. velocity and thermal gradients, are illustrated through plots. Also, the wall friction and energy transmission rate are bestowed via plots and tabular values. The outcomes reveal that the Xue nanomodel augments the thermal transmission rate of the nanofluid to a greater extent than the Maxwell nanomodel. This research holds potential for applications in geothermal power production.

This contribution describes the synthesis and characterization of bimetallic zirconium metallocene derived from unsubstituted 1,8-dihydro-as-indacene (as-IcH2). The complex [(Cp*ZrCl2)2-as-Ic] was synthesized from the dilithiated salt of as-indacene [as-Ic][Li]2 with two equivalent of [(Cp*ZrCl3)]. This complex here reported was characterized by means of 1H and 13C NMR, elemental analysis, and X-ray diffraction. In order to gain further knowledge about their catalytic behavior, the complex was tested in the catalysis of ethylene polymerization showing a highest activity. Theoretical calculations of zirconium compound were carried out to benefit additional understanding the mechanism of this novel olefin catalyst.

In this study, BaO nanorods (NRs) were synthesized with inherent surface defects using the chemical coprecipitation process. The rich oxygen defect BaO NRs exhibited enhanced light sensitivity and effectively interacted with the organic pollutant methylene blue (MB) dye under UV-light illumination for wastewater treatment. The X-ray diffraction (XRD) analysis confirmed the highly crystalline tetragonal structure of the BaO NRs. Microstructural characteristics were examined using theoretical approaches such as Debye-Scherrer (DS), Williamson-Hall (W-H), and Size-Strain Plot (SSP), revealing an average crystallite size of approximately 30 nm. Field emission scanning electron microscopy (FE-SEM) revealed the rod-shaped structure of the BaO nanorods, with particles aligned on top of each other. UV–visible absorption studies demonstrated an increased optical bandgap in the BaO NRs compared to the bulk material. Photoluminescence spectroscopy revealed the presence of oxygen traps and surface defects, which aided the photodegradation process. The photocatalytic activity of the BaO NRs was assessed by degrading MB dye. We found that a concentration of 150 mg of BaO NRs exhibited the highest degradation efficiency at 85 %.

AbstractPolyvinylidenefluoride (PVDF) is a semi‐crystalline ferroelectric polymer with a wide range of interesting properties and shows potentiality in a variety of technological applications. Flexible thin films of PVDF nanocomposites (NCs) have attracted many researchers due to their tunable electronic properties. This paper reports the synthesis, characterization, and dielectric studies of PVDF‐TiO2 NC thin films. The synthesized films are self‐supporting thin and the average thickness of the thin films is 60 µm measured using a Digital thickness gauge of resolution 0.01 mm. TiO2 nanoparticles are prepared using the combustion method. Commercially available PVDF granules are used to develop PVDF‐TiO2 NC thin films using the film casting technique. The structural study of the prepared thin films is carried out using XRD that confirms the retention of the β‐phase of PVDF. The functional group and bonding nature have been studied using FTIR Spectroscopy. The thermal stability of the NC thin films is studied using TGA. The variation of dielectric constant (DC), dielectric loss (DL), AC conductivity, and dissipation factor of the medium of pristine PVDF and PVDF‐TiO2 NC thin films are studied in the frequency range of 10 Hz to 8 MHz at ambient temperature. The dielectric constant of PVDF‐TiO2 NC thin films increases up to 8 wt% and anomaly for 10 wt% of TiO2 fillers in the PVDF matrix at a lower frequency and found to decrease with increasing frequency. The dielectric loss of NC thin films is high at a lower frequency and decreases with an increase in the frequency that is in good agreement with the Maxwell–Wagner type of interfacial polarization. At lower frequencies, the dielectric constant of PVDF‐TiO2 NC increases with the increase in filler content. AC conductivity shows a sharp increase at higher frequencies whereas the dissipation factor of the polymer NCs remains unaltered with respect to frequency by maintaining the trend. This suggests that PVDF‐TiO2 NC is potential material for energy storage devices.

Correction for ‘Unlocking the effect of Zn2+ on crystal structure, optical properties, and photocatalytic degradation of perfluoroalkyl substances (PFAS) of Bi2WO6’ by Mirabbos Hojamberdiev et al., Environ. Sci.: Water Res. Technol., 2023, 9, 2866–2879, https://doi.org/10.1039/D3EW00430A.

Energy is an essential component of life, and its production and utilization must be compatible with the ecosystem.

The effect of the phase transition from bismuth iodide to bismuth oxyiodides on the photodegradation efficiency of nitazoxanide is explored.

Recent research reports that the increasing number of new bacterial infections are resistant to current antibiotics and have become a significant issue for public health. Silver nanoparticles (AgNPs) as bactericides, fungicides, and anti-cancer agents are notably promising, as evidenced by the recent investigation of scientific communications worldwide. Though biocompatible and non-toxic, they are unstable at higher ionic strengths, and even ambient light may cause nano-silver to aggregate. The aggregation can be overcome by surface functionalization. Thus, the current report is an attempt for biologically active dimercapto-triazole (DMT), which has both free thiol (R-SH) and amine(R-NH2) groups were successfully used for the functionalization of AgNPs. Characterization techniques like UV/Vis-spectroscopy, zeta-potential, XRD, SEM, TEM, and FT-IR data confirmed the functionalization of AgNPs with the thiol (R-SH) group. The functionalized AgNPs have an average spherical particle size of 50–51 nm and a broad spectrum of activity for Gram-negative and Gram-positive bacteria and anti-cancer activity against MCF-7 cell lines with an IC50 value of −18.681 % v/v. Molecular docking studies reviewing the best-fitting conformation of DMT-capped AgNPs with the highest binding energy for target proteins of cancer and bacteria reveal its biocompatibility.