Scopus Research — Hawraa Abd Alkareem Alewi Almurshedy

Now, in this paper, we report the successful fabrication of MNPs-bis(2-hydroxyethyl)-guanidine-Ni nanocatalyst and study its catalytic behavior for the synthesis of pyrano[2,3-c]pyrazoles and highly functionalized piperidines. The Structure of the as-fabricated MNPs-guanidine-bis(ethanol)-Ni nanomaterial was fully characterized by advanced microscopic and spectroscopic methods, such as FT-IR, SEM, TEM, EDX, TGA, VSM, XRD and ICP-OES. With aryl aldehydes, ethyl acetoacetate, and aniline or malononitrile and hydrazine hydrate as the reactive species, the created MNPs-bis(2-hydroxyethyl)-guanidine-Ni catalytic agent acts as a promising candidate to deliver numerous pharmaceutically relevant highly functionalized piperidines and pyrano[2,3-c]pyrazoles scaffolds. The developed methodology comes with a host of advantageous features, such as gentle reaction conditions, a broad substrate range, great product yields, and a brief reaction time. Additionally, the Ni nanocatalyst could be easily recovered by a simple magnetic separation and recycled at least 8 times without deterioration in catalytic activity. © 2022 Taylor & Francis Group, LLC.

Using the microwave-assisted method, novel Fe3O4/Zn-metal organic framework magnetic nanostructures were synthesized. The crystallinity, thermal stability, adsorption/desorption isotherms, morphology/size distribution, and magnetic hysteresis of synthesized Fe3O4/Zn-metal organic framework magnetic nanostructures were characterized by XRD patterns, TGA curve, BET adsorption/desorption technique, SEM image, and VSM curve, respectively. After confirming the Fe3O4/Zn-metal organic framework magnetic nanostructures, its antimicrobial properties against Gram-positive bacterial, Gram-negative bacterial, and fungal strains based on minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and minimum fungicidal concentration (MFC) values were studied. The MIC values in antimicrobial activity for Gram-positive and Gram-negative bacterial strains, between 16–128 μg/ml, and for fungal strain, 128 μg/ml were observed. The results showed that the high specific surface area of Fe3O4/Zn-metal organic framework magnetic nanostructures caused the antimicrobial power of nanoparticles to be high, and the observed antimicrobial effects were higher than some known commercial antimicrobial drugs. Another advantage of the specific surface area of Fe3O4/Zn-metal organic framework magnetic nanostructures was its high catalytic properties in the three-component reaction of isatin, malononitrile, and dimedone. New spiro [indoline-pyranopyrimidines] derivatives were synthesized with high efficiency. The catalytic activity results of Fe3O4/Zn-metal organic framework magnetic nanostructures showed that, in addition to recyclability, derivatives could be synthesized in less time than previously reported methods. The results of investigating the catalytic activity of Fe3O4/Zn-metal organic framework magnetic nanostructures showed that the spiro [indoline-pyranopyrimidines] derivatives were synthesized in the time range of 10–20 min with an efficiency of over 85%. As a final result, it can be concluded that the microwave synthesis method improves the unique properties of magnetic nanostructures, especially its specific surface area, and has increased its efficiency. Copyright © 2022 Bashar, Kareem, Hasan, Ahmad, Alshehri, Al-Majdi, Hadrawi, AL Kubaisy and Qasim.

Because of its unique features, including optical, magnetic, and crystalline properties, CoFe2 O4 magnetic nanoparticles have gotten a lot of interest in photocatalytic process. In this work, CoFe2 O4 magnetic nanoparticles is applied to effective removal of Reactive Violet 5 as a water organic pollutant. For this purpose, the CoFe2 O4 magnetic nanoparticles is fabricated by a hydrothermal method at 170 °C for 12 h. Then, the crystalline structure, shape and size of the prepared CoFe2 O4 nanoparticles are characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM) methods. The performance of any photocatalyst depends on optical band gap energy of photocatalyst. So, the optical properties of the prepared CoFe2 O4 nanoparticles are investigated by the UV-Vis spectroscopy. The optical band gap of CoFe2 O4 magnetic nanoparticles (2.41 eV) lead to excellent photocatalytic properties of CoFe2 O4 nanoparticles. The obtained results showed that the prepared CoFe2 O4 nanoparticles could effectively degrade Reactive Violet 5. The 76.4% of Reactive Violet 5 was degraded in 75 minutes under visible light irradiation. © This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

Silica glasses are used to improve the mechanical properties of bioceramic composites, such as strength and durability. Nowadays, further improvements of the thermo-mechanical properties of dental composites are in great demand. The present study aimed to improve SiO2 dental composites’ mechanical properties using reinforced-hydroxyapatite nano-powder. Besides, investigation of their thermal properties is targeted in the research project. Hydroxyapatite (HA) is synthesized and characterized by XRD, XRF, FE-SEM, and TEM techniques and is used as an additive to dental composite mixtures. The mechanical properties of these composites, including flexural strength, modulus of rupture, diameter tensile strength (DTS), and compressive strength, are investigated. Furthermore, the heat transfer of composites both in water and SBF (as immersed subjects in simulated body fluid) is cross-examined. Five dental-composite samples are prepared, containing 30% HA. Compared to traditional, HA-containing composite structures, the samples exhibit better mechanical properties. Thermal conductivity enhancement of HA/SiO2 at 1.0 vol% and 50 °C is 11.23% in water and 11.1% in SBF. Since bioceramics are insulative materials, enhancing solid composites such as SiO2 with HA is necessary to improve their thermal properties. Finally, an optimization approach is applied to obtain the fittest correlation for water-based and SBF-based HA-SiO2 hybrid-nanofluids. Moreover, the neural network technique is initialized to forecast the effect of temperature on mechanical properties. © 2022 Elsevier B.V.

This paper investigates the cross-kink and solitary wave solutions to the nonlinear vibration and dispersive wave systems. The solutions include periodic, cross-kink and solitary wave solutions. The bilinear form is considered in terms of Hirota derivatives. Accordingly, we utilize the Cole-Hopf algorithm to get the exact solutions of the (2 + 1)-dimensional modified dispersive water-wave system. The analytical treatment of cross-kink, solitary wave solutions is studied and plotted in three forms of two, density and three-D plots. A nonlinear vibration system will be investigated. Employing appropriate mathematical assumptions, the novel kinds of the cross-kink and solitary wave solutions are derived and constructed in view of the combination of kink, periodic and soliton for cross-kink and also a combination of two kinks in terms of exponential functions for solitary of the governing equation. To achieve this, the illustrative example of the (2 + 1)-D modified dispersive water-wave system is furnished to exhibit the feasibility and reliability of the procedure utilized in this research. The trajectory solutions of the traveling waves are presented explicitly and graphically. The effect of the free parameters on the behavior of designed figures of a few obtained solutions for two nonlinear rational exact cases was also considered. By comparing the suggested technique with the other existing schemes, the results present that the execution of this technique is concise, simple and straightforward. © 2022 World Scientific Publishing Company.