Preparation of Emulsion Polymerization from Styrene Vinylpyrrolidone and Studying their Thermal Stability and Electrical Conductivity

Copolymer styrene and vinylpyrrolidone were prepared using different techniques. The emulsion polymerization technique was chosen as it gives the highest molecular weight with polymer particles in the nanorange. The polymer nanocomposites were prepared using Pickering emulsion polymerization stabilized by adding inorganic nanosized particles. Ag nanometal and nanometal oxides of CuO, ZnO and AgO were added into the copolymer for enhancing its thermal stability and electrical conductivity. The nanocomposite chemical structure was confirmed by using FTIR, 1HNMR spectroscopy and TEM. Transmission electron microscopy, TEM photos show that the copolymer particles are almost in the nanoscale region. The thermal stability (TGA) of styrene-co-vinylpyrrolidone in the presence of the nanometal and nanometal oxides was slightly increased. The electrical conductivity of these nanocomposites using dc at different temperatures was measured. The data reveal that the nanocomposites are enhanced by adding the nanometal and nanometal oxides. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3556

Synthesis and Biocidal Activity of Some Naphthalene-Based Cationic Surfactants

In this study, different cationic surfactants were prepared by reacting dodecyl bromide with tertiary amines to produce a series of quaternary ammonium salts that were converted subsequently to stannous and cobalt cationic complexes via complexing them with stannous (II) or cobalt (II) ions. Surface properties such as surface- and interfacial-tension, and the emulsifying power of these surfactants were investigated. The surface parameters including critical micelle concentration, maximum surface excess, minimum surface area, tension lowering efficiency and effectiveness were studied. The free energy of micellization and adsorption were calculated. Antimicrobial activity was determined via the inhibition zone diameter of the prepared compounds, which was measured against six strains of a representative group of microorganisms. The antimicrobial activity of some of the prepared surfactants against sulfate reducing bacteria was determined by the dilution method. FTIR spectra, elemental analysis and a H1 NMR spectrum were examined to confirm compound structure and purity. The results obtained indicate that these compounds have good surface properties and good biocidal effect on broad spectrum of micro organisms

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