Publications

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Cerium oxide (CeO2 1) nanoparticles (NP) have been synthesized hydrothermally in the presence of urea and studied the effect of particle size on the chemical sensing and photo-catalytic properties of CeO2. CeO2 1 was described by field emission scanning electron microscopy (FESEM), Energy dispersive spectroscopy (EDS), X-ray powder diffraction (XRD), Raman spectrum, Fourier transform infrared spectroscopy (FTIR), and UV-visible absorption spectrum which divulged that the prepared product is well crystalline cubic phase optically active nanoparticles. SEM images of CeO2 1 illustrated that the synthesized product is composed of cumulative form of highly crytallinity spherical shape nanoparticles with an average diameter of ~ 12 ± 10 nm. Additionally, CeO2 1 was exploited as redox mediator for the development of ethanol chemi-sensor. The fabricated chemical sensor exhibited an excellent performance for electrocatalytic oxidization of ethanol by exhibiting higher sensitivity (1.192 μA.cm-2.M-1) and lower limit of detection (9.7 μM) with the linear dynamic range of 17.0 μM ~ 1.7 M. Moreover, by applying to organic pollutant, CeO2 1 degraded almost 50% of acridine orange in short time. By comparing with 2, CeO2 1 showed lower particle size, lower limit of detection and higher sensitivity toward ethanol sensing and high photo-catalytic activity for degradation of acridine orange. It is concluded that reduction in the particle size enhances the active surface area of the CeO2 which results in increase of chemical sensing and photo-catalytic properties of CeO2.

The effect of theblack medick (Medicago lupulina L.) herbextraction cytotoxic activity of healthy donors and cancer patients’ lymphocytes was studied. It was established that the extraction of M. lupulina has a direct cytotoxic effect on tumor cells and activates the antitumor activity of natural killers by interleukin – 2up-regulation. Theextraction of M. lupulina has a direct cytotoxic effect on the line of K-562 human tumor cells in a concentration not lower than 5mg/ml; Increases the cytotoxicity of lymphocytes in healthy donors and oncological patients against K-562 tumor cells in a concentration of at least 1.0mg/ml by 18% and by 23% accordingly. At the same concentration, it causes a reliable increase of 12% in the level of interleukin-2 in healthy donors and of 17% in oncological patients without effect of on the level of interleukin-1. The mechanism of M. lupulina activation influence on the cellular link of antitumor immunity can be related to the ability of biologically active substances isolated from alfalfa hops to stimulate release of regular cytokines from lymphocytes, inter alia, IL-2.M. lupulina herb can be used to create effective and low-toxic preventive medicines containing flavonoids. Natural flavonoids have a more selective and mild effect.The effect of the M. lupulina extracton cytotoxic activity of healthy donors and cancer patients lymphocytes was studied. It was established that the M. lupulina extract on has a direct cytotoxic effect on tumor cells and activates the antitumor activity of natural killers by interleukin – 2up-regulation.

A MnAl₂O₄·ZnAl₂O₄ nanomaterial was synthesized by co-precipitation and characterized by XRD, SEM, EDS, TEM, AFM, FTIR, PL, CV and EIS. The photocatalytic activity of the nanocomposite against MV dye and its MDR anti-bacterial functions were studied. The nanocomposite shows excellent photocatalytic as well as anti-bacterial activity. A MnAl₂O₄·ZnAl₂O₄ nanomaterial/Nafion/GCE electrode was fabricated and implemented as the working electrode of a 3-CP sensor. The sensor exhibited good sensitivity, with the lowest detection limit, fast response time, large linear dynamic range (LDR), and long-term stability in the chemical environment. The estimated sensitivity is 70.07 μA mM^-1 cm^-2. The LDR, limit of detection (LOD), and limit of quantification (LOQ) are 0.1 nM to 0.01 M, 0.0014 ± 0.0001 nM, and 0.004 nM, respectively. The MnAl₂O₄·ZnAl₂O₄ nanomaterial/Nafion/GCE is a promising fabricated sensor probe for the selective detection of 3-CP for the environmental safety and healthcare fields on a large scale.

Ethanol chemical sensors have been developed by proficient exploitation of polypropylene carbonate (PPC) and PPC/cloisite 20B (clay) nanocomposite (NC) for the detection and quantification of ethanol in the environment. NC was synthesized by the addition of polypropylene carbonate (PPC) into 5 wt% of cloisite 20B. The physicochemical structure was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. The thermal and mechanical properties of PPC and NC were investigated by thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and nanoindentation analyzer, respectively. NC displayed high thermal and mechanical properties. TGA results revealed that the thermal decomposition temperature (Td50%) of PPC increased significantly, being 43 °C higher than that of pure PPC, while DSC measurements indicated that NC increased the glass transition temperature from 21 to 32 °C. Accordingly, NC showed a high elastic modulus and hardness as compared to PPC. By applying to ethanol sensing, both PPC and NC performed as the best ethanol chemi-sensors in terms of sensitivity. NC showed 3.24 times higher sensitivity (0.8231 μA cm−2 mM−1) as compared to pure PCC (0.2543 μA cm−2 mM−1).

Electrocatalytic NO reduction controls NO emission and produces NH₃ under ambient conditions. Herein, a NiO nanosheet array on titanium mesh is proposed as a highly active and selective electrocatalyst for NO reduction, attaining a faradaic efficiency of up to 90% with a NH₃ yield of 2130 μg h^-1 cm^-2. Its aqueous Zn-NO battery can generate electricity with a power density of 0.88 mW cm^-2 and simultaneously offer an NH₃ yield of 228 μg h^-1 cm^-2. The NO electroreduction mechanism on NiO is revealed using theoretical calculations.

Environmental friendly and biodegradable nanocomposite (NC) has been developed by efficient intercalation of poly propylene carbonate (PPC) into the interlayer space of cloisite 20B (C-20B) for biomedical and food packaging applications. The physicochemical and structural characterization was studied by X-ray diffraction (XRD) and Fourier transforms infrared spectroscopy. Thermal stability, mechanical property and anti-water sorption capacity of PPC and nanocomposite were scrutinized by thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC), nanoindentation analyzer and thin film diffusion analyzer, respectively. Nanocomposite showed very high thermal decomposition temperature (Td50%) and 10 °C higher glass transition temperature when compared to pure PPC. In addition the nanocomposite exposes high elastic modulus, hardness and anti-water sorption property as compared to PPC. Therefore, this nanocomposite can be used in biomedical and food packaging applications. Keywords: Poly propylene carbonate, cloisite 20B, nanocomposite, thermal stability, hardness, modulus, water absorption