Journal of Composites and Compounds
Volume:5 Issue: 14, Mar 2023

In this research, enhanced WBMs (water-based muds) was prepared by using SiO2 and Al2O3 nanofluids (size 15-20 nm) in aqueous solution of bentonite and investigated on thermal conductivity, filtration and rheological properties at three temperatures of 27, 50, and 80 °C. Nanofluids were prepared in different concentrations of 0.01, 0.03, 0.05, 0.1, 0.5, and 1 wt% in base fluid. Experimental data with flow curves for different nano water-based drilling fluid (NWBDF) are fitted to rheological drilling fluid models (Herschel-Bulkley, Bingham plastic, and power law models). According to the results, NWBDF follow Herschel Bulkley's model for rheological behavior. All samples exhibit shear-thinning behavior because the shear rate decreases as the apparent viscosity increases. After adding 1 wt% of SiO2 nanoparticles, the plastic viscosity (PV) increased to 14 ± 0.02 cP. Comparing the permeability of clay cakes according to Darcy's law showed that nanofluids are more impermeable cakes than the base fluid. Thermal conductivity was dramatically improved in the presence of both samples at 80 °C. ©2023 UGPH.

In this research, the preparation of a reusable AlFeO3@SiO2@SO3H nanostructure as a perovskite-based magnetic nanomaterial is described. The structure of prepared AlFeO3@SiO2@SO3H was characterized by FT-IR, XRD, FE-SEM, EDS, TGA, and VSM analyses. The prepared acidic hybrid nanocatalyst showed high thermal stability and used as an efficient magnetic nanocatalyst in the synthesis of 3,4-dihydropyrimidin-2-one, and mono/ bis 1,4-dihydropyridine derivatives as pharmaceutically active heterocycles under solvent free conditions. High efficiency of procedure, good yields, short reaction times, magnetic recovery and reusability of nanocatalyst, high thermal stability of catalyst, and environmentally benign conditions are highlights of this new protocol.

Cyclodextrin is a cyclic molecule that contains the three essential six, seven, and eight glucose molecules, called by the names α, β, and γ-cyclodextrin, individually. Cyclodextrins are thought to be completely polar as a result of the hydroxyl groups presents in glucose moieties. Secondary C2-hydroxyl groups of glucose units are found on the secondary face, while the C6-hydroxyl type groups are located on the primary face because these are related to the primary face of the incomplete cone. The C1 group, a glucoside oxygen ring, and another ring of C-H groups make up the inside of the cyclodextrin cone, making it rather nonpolar. Hydrophobic fullerenes Cn [n= 60, 70, 76, 82, and 86] have been chosen for the guest molecules and different parameters like first to fourth free activations, the kinetic rate constant, the energies of electron transfer (ket(n)), and ΔG#et(n) where (n=1-4), were calculated and discussed in detail. All the computed results showed the best coherence with the Marcus theory. Different analyses suggested that free energy is lowered due to an efficient electron transfer, which begins with the first step (the first of the four activate free energy values).

To prevent a major energy crisis in the near future, it is necessary to assemble efficient electrochemical energy storage devices such as supercapacitors. Herein, a Fe3O4@Fe3S4 nanocomposites coated with polyindole-polythiophene on nickel foam (NF) has been prepared by following a low facile, multistep method. In terms of structural and electrochemical performance, the nanocomposites have been investigated. The electrochemical properties of as fabricated Fe3O4@Fe3S4@PIn-PTh are studied in 2M KOH. A specific capacitance of 100.83 F g−1 at a current density of 2 A g-1. The results of the synthesized sample in comparison with Fe3O4 show that using sulfide metal and polymer component improve the electrochemical performance. These characteristics of Fe3O4@Fe3S4@ PIn-PTh as the active material illustrate a sutiable performance as a cathode material for electrochemical energy storage.

The properties of metal-organic frameworks (MOFs), a potential class of porous crystalline materials with a wide range of uses, depend on their structural details, including compositions and architectural designs. Through functionalization and their interaction with other nanomaterials, MOFs' structure and design have undergone changes as a result of their extensive research. Numerous outstanding evaluations on single MOFs, MOF-based composites created through conjugation with non-MOF materials, and their derivatives have summarized the developments in the field of MOFs. A thorough examination of MOFs and their combination is, however, lacking. In this perspective, we present a current and thorough description of the accomplishments of MOF-based hybrids below. First, a description of the synthetic strategy/formation process is provided to illustrate how host and visitor MOFs interact. The structural diversity in MOF-based systems is then thoroughly examined to show how MOF systems enable advancements in abased composites for a variety of applications, particularly in the medical and environmental fields. Finally, we present our personal opinions on the difficulties and potential paths for the development of MOFs materials.

Nickel sulfide (NiS) is an extremely a transition metal sulfide with great potential use as a sensor material because of its exceptional conductivity and stability. Herein, we present first, the all of synthesis of NiS into sensor and biosensor. Electrochemical sensor, Due to the fact that disposal to electrolyte during electrochemical impact can rapidly deform NiS, lowering its electroactivity and measurement repeatability, a method for effectively integrating NiS into sensors is crucial. Then, the main focus of this review is the recent advancements in sensor systems that utilize NiS and its composites. The article discusses the correlation between sensing performance and electrode construction strategies, and identifies shortcomings and limitations in the current applications of these sensors. Based on this analysis, the authors suggest potential future directions and areas for further research in the development of NiS-based sensors. This study focused on developments in NiS-based sensor systems and their composites throughout the past articles. The article investigates the correlation between the way electrodes are made and the effectiveness of the sensors they produce. On this basis, we discuss the scope for future of NiS-based sensors and offer additional directions.

Supplying clean water is a significant problem in contemporary societies. The rise of industrialization and urbanization, coupled with population growth have caused a shortage of clean water supplies, and the disparity between pure water demand and availability is expected to worsen. For this reason, the need to treat water impacted by emergent organic contaminants (EOCs) and inorganic pollutants has become a primary worldwide concern. The most promising approach for water treatment is the use of primary photocatalytic oxidation processes. The paper begins by outlining the issue of scarce water supplies and the many methods of purification, including photocatalysis using semiconductors like metal oxides, graphene oxides, and MOFs. Moreover, the articles also review published research on the application of these photocatalysts materials for the degradation of pollutants from water. Finally, the article provides an overview of photocatalytic water treatment technology, discussing the basic mechanism of photocatalysis and nanobased photocatalysts used for the degradation of organic pollutants in water and wastewater.