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  1. Article ; Online: Enhanced efficiency of flexible organic polymer solar cells by incorporation of titanium dioxide nanoparticles

    Manal A. Awad / Awatif A. Hindi / Khalid M.O. Ortashi / Meznah M. Alanazi / Albandari W. Alrowaily / Taghreed Bahlool / Fatma Aouaini

    Journal of King Saud University: Science, Vol 35, Iss 5, Pp 102690- (2023)

    2023  

    Abstract: Solar power has quickly become one of the most effective forms of renewable energy today as it provides a clean solution to the growing demand for energy. Most solar panels in the market are rigid as they are made up of metals; therefore, organic ... ...

    Abstract Solar power has quickly become one of the most effective forms of renewable energy today as it provides a clean solution to the growing demand for energy. Most solar panels in the market are rigid as they are made up of metals; therefore, organic polymers provide a flexible alternative. Nanotechnology provides the synthesis of nanoparticles by simple approaches suitable for applications in various fields. Nanoparticles of titanium dioxide (TiO2) were synthesized and characterized in this paper (NPs), which were further incorporated in the construction of a novel, organic polymer solar panel (OPSC) that is flexible and portable; it is made from thylakoid (chloroplast) extract of chard (B. vulgaris subsp. cicla) combined with polystyrene polymer matrix. Insertion of TiO2 NPs in the OPSC improved the current generation compared to the reference devices (OPSC) without TiO2 NPs. Therefore possible uses for the constructed solar panel were suggested. The prepared films were tested for the current generation. Under illumination, the solar panels generated a current of −140 µAp, and −213 µAp without and within TiO2 NPs, respectively. This study opens windows for manufacturing flexible, efficient, and stable organic polymer solar panels.
    Keywords Characterization ; Polymer solar panel ; Chloroplasts ; Titanium dioxide ; Nanoparticles ; Science (General) ; Q1-390
    Subject code 600
    Language English
    Publishing date 2023-07-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Green synthesis, characterization and biomedical potential of Ag@Au core–shell noble metal nanoparticles

    Mona S. Alwhibi / Khalid M.O. Ortashi / Awatif A. Hendi / M.A. Awad / Dina A. Soliman / Mohamed El-Zaidy

    Journal of King Saud University: Science, Vol 34, Iss 4, Pp 102000- (2022)

    2022  

    Abstract: In the current times, nanotechnology has emerged as a field that promises scientific advancement with the manipulation, improvement, and application of near-atomic scale materials.Bimetallic nanoparticles (NPs) have been explored for their wide range of ... ...

    Abstract In the current times, nanotechnology has emerged as a field that promises scientific advancement with the manipulation, improvement, and application of near-atomic scale materials.Bimetallic nanoparticles (NPs) have been explored for their wide range of applications owing to their multi-functionalilty. The present study included the synthesis of bimetallic silver@gold (Ag@Au) NPs from aqueous chloroauric acid (HAuCl4) and silver nitrate (AgNO3) making use of ‘green chemistry’ with the extract of Acacia nilotica husk as a reducing and capping agent. The formed bimetallic NPs were characterized by various spectrometry and electron microscopy techniques and devices, including ultraviolet–visible spectroscopy (UV/VIS), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) attached to scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and the particle size distribution was analyzed by dynamic light scattering (DLS) technique. FTIR results identified the functional groups that are involved in and interact with biomolecules and nanoparticles surfaces through extensive screening on synthesized colloidal bimetallic NPs. The synthesized core – shell had mean size and monodispersity index (PDI) values of 0.223 and 61 nm, respectively. TEM micrographs clearly indicated that the Au NPs were coating and surrounding the Ag NPs and their size, distribution and shapes were homogeneous and uniform. Anticancer activity of the synthesized Ag@Au NPs was explored using MTT assay; the recorded cell viability was 500 μg/ml and the cytotoxicity (IC50) was 74.6 ± 7.43 µg/ml for HeLa cell line. This anticancer activity of the Ag@Au NPs opens the window wide for their use in cancer therapy and other biomedical applications.
    Keywords Green synthesis ; Silver@Gold ; Nanoparticles ; Acacia nilotica ; Anticancer activity ; Science (General) ; Q1-390
    Subject code 540
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Wet chemical synthesis and characterization of FeVO4 nanoparticles for super capacitor as energy storage device

    Manal A. Awad / Awatif A. Hendi / Sarala Natarajan / Khalid M.O. Ortashi / Sarah S.A. Alsaif / Reema A. Alnamlah / Abeer Rasheed / Hayat Althobaiti

    Journal of King Saud University: Science, Vol 35, Iss 8, Pp 102857- (2023)

    2023  

    Abstract: Vanadates of transition metal found its potential applications in the fields of lithium ion batteries, gas sensors, photo catalysts, solar cells and so on. Among the metal vanadates, Iron vanadate is vital as an organic pollutant remedying, gas sensor ... ...

    Abstract Vanadates of transition metal found its potential applications in the fields of lithium ion batteries, gas sensors, photo catalysts, solar cells and so on. Among the metal vanadates, Iron vanadate is vital as an organic pollutant remedying, gas sensor material, and selective catalytic reduction material. This current research focuses on synthesizing iron vanadate nanoparticles by wet chemical synthesis with controlled pH using ammonia solution. The nanostructured FeVO4 particle were characterized structurally with the powder XRD studies. Strong crystal planes were formed at Miller indices (111), (0–12), and (−220) which is confirmed from the intensity of the diffraction peaks. FT- IR and micro Raman studies was taken to identify the molecular vibrations present in the material and it shows that the sharpest apex at 508 cm−1 obtained is attributed to the stretching oscillations of Fe–O and V–O–V modes. The Raman spectrum confirmed the separation of Fe − O, V − O, and different stretching fashions of V − O − Fe. The V–O stretching mode increases the intense bands showing the very high strongest peak of FeVO4 because of electro negativity of iron the metal. The morphology of iron vanadate was confirmed with SEM analysis showing that particles are much isolated and cubical with few polyhedron structures. The electrochemical response of FeVO4 evaluated the specific capacitance at 10 mV/s as 402 Fg−1.Energy density values were calculated as 16.08 Whkg−1, 13.08 Whkg−1, 10.2 Whkg−1, 8.76 Whkg−1, 7.64 Whkg−1 and 6.92 Whkg−1 from the cyclic voltammetry profile at the slow rates varying from 10 −100 mV/s. The magnetic properties were analyzed by measuring the magnetic susceptibility and magnetization using a VSM magnetometer and the results evident that the material exhibits the paramagnetic behavior.
    Keywords FeVO4 Nanoparticles ; Controlled pH ; Specific Capacitance ; Paramagnetic Nature ; Science (General) ; Q1-390
    Subject code 620
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Attenuating effect of Indian mustard (Brassica juncea) seed and its nano formulation on arsenic induced-oxidative stress and associated genotoxicity in rat

    Promy Virk / Sarah Turif Abdulhadi Alajmi / Manal Awad / Mai Elobeid / Khalid M.O. Ortashi / Atheer Mohammed Asiri / Nada M. Merghani / Dalia Fouad

    Journal of King Saud University: Science, Vol 34, Iss 6, Pp 102134- (2022)

    2022  

    Abstract: Objective: Arsenic (As) has been in the forefront of toxicological research due to its continual worldwide human exposure and its adverse effects including genotoxicity. The study assessed the potential ameliorative effect of Indian mustard seeds ( ... ...

    Abstract Objective: Arsenic (As) has been in the forefront of toxicological research due to its continual worldwide human exposure and its adverse effects including genotoxicity. The study assessed the potential ameliorative effect of Indian mustard seeds (Brassica juncea) and their nanoparticles against arsenic toxicity. Methods: Male Wistar rats were used for the exposure study. Group I was control and group V was exposed only to the nanoparticles. Groups II, III, and IV were exposed to 10 mg/kg sodium arsenite for two weeks. Groups III and IV were treated with mustard seeds and the nanoparticles (500 mg/kg) respectively. Results: Arsenic intoxication caused a marked increase in the levels of As in the brain. Additionally, oxidative damage was exhibited with significantly enhanced levels of serum 8-OHdG and hepatic p53 and pS15. The pictographs and the analyzed parameters of the COMET assay illustrated DNA damage with significantly increased values of tail moment and length. Treatment with mustard seeds and its nanoparticles markedly reversed the adverse effects of As toxicity, which is attributed to the presence of a gamut of constituent phytocompounds in the mustard seeds. Conclusion: Taken together the nano formulation was more efficacious and could be introduced as a potential nutraceutical to combat metal toxicity.
    Keywords Arsenic ; Indian mustard seed ; Brassica juncea ; Oxidative stress ; Genotoxicity ; Nanoformulation ; Science (General) ; Q1-390
    Subject code 500
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: In Silico Studies on Zinc Oxide Based Nanostructured Oil Carriers with Seed Extracts of Nigella sativa and Pimpinella anisum as Potential Inhibitors of 3CL Protease of SARS-CoV-2

    Awatif A. Hendi / Promy Virk / Manal A. Awad / Mai Elobeid / Khalid M. O. Ortashi / Meznah M. Alanazi / Fatemah H. Alkallas / Maha Mohammad Almoneef / Mohammed Aly Abdou

    Molecules, Vol 27, Iss 13, p

    2022  Volume 4301

    Abstract: Coming into the second year of the pandemic, the acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its variants continue to be a serious health hazard globally. A surge in the omicron wave, despite the discovery of the vaccines, has shifted the ... ...

    Abstract Coming into the second year of the pandemic, the acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its variants continue to be a serious health hazard globally. A surge in the omicron wave, despite the discovery of the vaccines, has shifted the attention of research towards the discovery and use of bioactive compounds, being potential inhibitors of the viral structural proteins. The present study aimed at the green synthesis of zinc oxide (ZnO) nanoparticles with seed extracts of Nigella sativa and Pimpinella anisum —loaded nanostructured oil carriers (NLC)—using a mixture of olive and black seed essential oils. The synthesized ZnO NLC were extensively characterized. In addition, the constituent compounds in ZnO NLC were investigated as a potential inhibitor for the SARS-CoV-2 main protease (3CLpro or Mpro) where 27 bioactive constituents, along with ZnO in the nanostructure, were subjected to molecular docking studies. The resultant high-score compounds were further validated by molecular dynamics simulation. The study optimized the compounds dithymoquinone, δ-hederin, oleuropein, and zinc oxide with high docking energy scores (ranging from −7.9 to −9.9 kcal/mol). The RMSD and RMSF data that ensued also mirrored these results for the stability of proteins and ligands. RMSD and RMSF data showed no conformational change in the protein during the MD simulation. Histograms of every simulation trajectory explained the ligand properties and ligand–protein contacts. Nevertheless, further experimental investigations and validation of the selected candidates are imperative to take forward the applicability of the nanostructure as a potent inhibitor of COVID-19 (Coronavirus Disease 2019) for clinical trials.
    Keywords coronavirus ; Nigella sativa ; Pimpenella anisum ; molecular docking ; molecular dynamic simulation ; zinc oxide nanoparticles ; Organic chemistry ; QD241-441
    Subject code 540
    Language English
    Publishing date 2022-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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