Yazar "Hsissou, R." seçeneğine göre listele

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    Carbon Dots in Stationary Phase of Chromatography, Enhanced Crop Yield, and Stationary Phase of Chromatography
    (American Chemical Society, 2024) Rbaa, M.; Hsissou, R.; Dahmani, K.; Oubaaqa, M.; Tüzün, B.; Berdimurodov, E.; Rouifi, Z.
    The scientific research area has been paying close attention to carbon dots (CDs) over the last decade. They perform exceptional optical and chemical properties because of their size-dependent quantum confinement effects, minimal toxicity, improved biocompatibility, and favorable charge and electric conductivity. So, they provide a unique affinity for different analytes, and high surface coverage makes them a promising alternative for different chromatographic methods, such as high-performance liquid chromatography (HPLC) and thin-layer chromatography (TLC), which are useful in fields such as chemistry, biochemistry, pharmaceuticals, forensics, environmental analysis, and more. This chapter focuses on understanding how CDs can improve the interaction between the stationary phase and the analytes, to explain the compounds’ rather interesting separation efficiency, selectivity, and sensitivity during chromatographic analyses. Then, we expose the criteria of choice of some examples of conventional stationary phases used in different chromatographic techniques and stationary phases, in terms of selectivity and efficiency of the separation. It therefore explains the processes involved in separating and quantifying the components of a chemical mixture using the chromatography technique, while discussing the advantages of using carbon dots as stationary phases. At last, we have compiled the properties of CDs in terms of remarkable photoluminescence, high quantum yield, low toxicity, small size, appreciable biocompatibility, and abundance sourced from low-cost carbon. These have been used to explain their separation efficiency, selectivity, and sensitivity to chromatographic analysis. In short, this chapter supports the use of carbon-dot-containing stationary phases over conventional stationary phases as a powerful analytical prospect, particularly for improving chromatography yield and stationary phase. © 2024 American Chemical Society.
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    Insight into the corrosion inhibition of novel macromolecular epoxy resin as highly efficient inhibitor for carbon steel in acidic mediums: Synthesis, characterization, electrochemical techniques, AFM/UV-Visible and computational investigations
    (Elsevier, 2021) Hsissou, R.; Abbout, S.; Benhiba, F.; Seghiri, R.; Safi, Z.; Kaya, S.; Briche, S.
    The present work aimed to investigate the corrosion behaviour of carbon steel (CS) in hydrochloric acid and sulfuric acid solutions (1 MHCl and 0.5 M H2SO4) in the presence of new macromolecular epoxy resin synthesized namely N2.N4.N6-tris(2-(oxiran-2-yl methoxy) ethyl)-N2.N4.N6-tris(oxiran-2-yl methyl)-2. 4.6-triamine-1.3.5-triazine (ERT). This corrosion protection activity was detected by utilizing various methods including electrochemical impedance spectroscopy (EIS), polarisation curve (PC) measurements, atomic force microscope (AFM) analysis, global quantum chemical descriptors computations (GQCDs) and molecular dynamics (MDs) simulation. The corrosive solutions after corrosion tests have been identified by UV-visible. The obtained results, indicating that the compound as mixed type inhibitor significantly reduced the corrosion rate of CS due to the formation of a stable protective film on the metal surface. As confirmed by EIS, AFM and theoretical studies, chemically adsorbed ERT molecule is a better corrosion inhibitor with higher corrosion efficacy of about 95.5% in HCl and 98% in H2SO4 at room temperature. Langmuir isotherm model is the most acceptable one to describe the ERT molecules adsorption on the surface of CS. Protection mechanisms were supported by GQCDs, Fukui functions, dual local descriptors, radial distribution function and MDs simulation. These theoretical calculations support the results obtained experimentally to qualify ERT as a very effective inhibitor against the corrosion of CS in both acidic media. (C) 2021 Elsevier B.V. All rights reserved.
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    Synthesis of new halogenated compounds based on 8-hydroxyquinoline derivatives for the inhibition of acid corrosion: Theoretical and experimental investigations
    (Elsevier, 2022) Rbaa, M.; Galai, M.; Ouakki, M.; Hsissou, R.; Berisha, A.; Kaya, Savas; Berdimurodov, Elyor
    In the present work, a new 8-hydroxyquinoline substituted with bromine (Q-C4Br) and chlorine (Q-C4Cl) was first synthesized and introduced as a powerful corrosion inhibitor for carbon steel in 1.0 M HCl. These compounds were obtained in high yield, and their structures were characterized by infrared (IR) spectroscopy, NMR spectroscopy (C-13, H-1) and elemental analysis (EA). The anti-corrosion properties of Q-C4Br and Q-C4Cl were tested by experimental [mass loss (ML), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)] and theoretical [density functional theory (DFT), Monte Carlo simulations (MC) and molecular dynamic simulations (MD] methods. Inductively coupled plasma mass spectrometry-optical emission spectrometry (ICP-OES) and UV-visible spectroscopy (UV-vis) were used to identify the corrosion and inhibition processes in solutions. The surface morphology of the steel surface after corrosion and inhibition processes was investigated by AFM, EDS, SEM and FT-IR spectroscopy. It is found that these compounds are ideal corrosion inhibitors for steel, and Q-C4Cl was a better inhibitor than Q-C4Br. The inhibition behavior, chelation characteristics, donor-acceptor effects and coordination bonding properties of the 8-hydroxyquinoline ring were enhanced by the Br and Cl modifications. The obtained results may be useful for creating the next generation of corrosion inhibitors based on aromatic compounds in future research works.