Oxide ionic conductivity properties of binary δ-(Bi2O3)1 - x (Yb2O3) x system

In this study, after doping ytterbium oxide (Yb2O3) to a-bismuth trioxide (a-Bi2O3) in the range of 9% n 20% in a series of different mole ratios, heat treatment was performed by applying a cascade temperature rise in the range of 700–790 C for 48 hours and new phases were obtained in the (Bi2O3)1 x(Yb2O3)x system. After 24 hours of heat treatment at 700 C and 750 C and 48 hours of heat treatment at 790 C, mixtures containing 9–20 mol% Yb2O3 formed a face-centered cubic phase. With the help of X-ray diffraction (XRD), the crystal systems and lattice parameters of the solid solutions were obtained and their characterization was carried out. The surfaces of the solid solutions were detected by a scanning electron microscope (SEM). Thermal measurements were made by using a simultaneous DTA/TGA (differential thermal analysis/thermogravimetric analysis) system. The total conductivity (sT) in the d-Bi2O3 doped with Yb2O3 system was measured using the four-probe DC method

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Performance improvement of Co3O4@nHAP hybrid nanomaterial in the UV light-supported degradation of organic pollutants and photovoltaics as counter electrode

© 2021An eco-friendly hybrid nanomaterial, the cobalt supported on nano-hydroxyapatite (Co3O4@nHAP), which the nano-hydroxyapatite (nHAP) is a promising material for catalytic systems because of immobilization stability with metals or complexes, was fabricated by ultraviolet irradiation and calcination. The prepared hybrid nanomaterial (Co3O4@nHAP) was characterized by FT-IR, XRD, FESEM, EDX, and mapping, and the cobalt ions were founded to be incorporated into the hydroxyapatite surface. The Co3O4@nHAP nanomaterial was used as a catalyst in the reduction of 2-nitrophenol (2-NP) and Rhodamine B (Rh B) and for the first time, the Co3O4@nHAP type nanomaterial was tested as a counter electrode in the dye-sensitized solar cells (DSSC). The catalytic conversions of Co3O4@nHAP nanomaterial were founded as 97.8% at 12 min. for 2-NP and 86.7% at 15 min. for Rh B and the reusability work for the 2-NP was performed as I - V cycles between 97.8%, to 85.8%, respectively. Also, the power conversion efficiencies (PCEs) of Co3O4@nHAP and Co3O4@nHAP/CNT in the DSSC devices as a counter electrode (reduction layer) were recorded as 0.05% and 0.36%, respectively. These model tests for the development of low cost and effective catalysts show promise

Microwave-Assisted and Green Fabrication of Carbon Quantum Dots from Viburnum opulus for Potential Bioimaging Applications

Early diagnosis is very strategic for today’s diseases such as cancer and infectious diseases. Mostof the mortality in these diseases has not been diagnosed early and the mortality rates decreasesignificantly in early diagnosed cases. Carbon quantum dots (C-dots), which are fluorescent materialsused in early diagnosis methods, are both novel and promising materials. The carbon quantum dotshave proved their usefulness in bio-applications with this feature. Herein, we reported that a stepfacile-green microwave-assisted hydrothermal fabrication of C-dots was carried out from Viburnumopulus as a green substrate (Figure 1). The characterization of the fabricated C-dots from Viburnumopulus was accomplished by Fourier transform infrared spectroscopy (FT-IR), UV-vis spectrophotometer,and field-emission scanning electron microscope (FE-SEM). The carbon quantum dots havemultifunctional properties that can be found in many areas. For example, they are importantmaterials that can be used in high-performance nanoprobes, bio-imaging applications, moleculelabeling applications, labeling and imaging techniques in cancer cells, and as contrast agents.&nbsp;</p

Palladium(II) complexes assembled on solid materials: as catalysts for the -NO2 (nitro) to -NH2 (amine) reactions

Herein, a new series of [PdCl2(L)(2)] complexes where ligands are monodentate amine ligands bearing sulfonamide groups were synthesized, characterized using various techniques such as NMR, FT-IR, UV-Vis, and sc-XRD and investigated for their catalytic performance for the reduction of nitroarenes (2-nitroaniline, 4-nitroaniline, and nitrobenzene) in the presence of NaBH4 in water under heterogeneous conditions. Because the results show that the synthesized complexes are very efficient catalysts, materials using the selected palladium(II) complex supported by multiwall carbon nanotubes, silicon dioxide, and iron(II,III) oxide (Fe3O4) were fabricated by a simple-impregnation methodology, characterized by FT-IR, BET, TEM, and XRD techniques and investigated for their catalytic performance for the same reaction. Thus, a series of supported catalysts was designed with the aim of both enhancing catalytic activity and reducing noble-metal contents. Our findings serve to develop simple catalytic systems and this system can be easily used for catalytic reduction reactions which are the cornerstone of the production of important chemicals