7 research outputs found

    Influence of LaNiO<sub>3</sub> Shape on Its Solid-Phase Crystallization into Coke-Free Reforming Catalysts

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    Shape-controlled LaNiO<sub>3</sub> nanoparticles were prepared by modified hydrothermal and precipitation routes resulting in cubes, spheres, and rods. The solid-phase crystallization of LaNiO<sub>3</sub> into its active catalyst form, Ni/La<sub>2</sub>O<sub>3</sub>, was found to be highly dependent on the shape and structure of the parent nanoparticle. Factors such as the crystallization pathway and Ni<sup>2+</sup>-ion depletion are considered as key factors influencing the final material. Catalysts derived from LaNiO<sub>3</sub> spheres and rods were found to be free of carbon accumulation after 100 h of reforming, while those derived from cubes showed excessive carbon accumulation and signs of sintering. All three catalysts are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and thermogravimetric analyses (TGA). The presence of defects, particularly stacking faults within the perovskite, may impact the reduction pathway and subsequent catalytic properties. Stable and active catalysts can therefore be designed and tuned by controlling the shape and structure of perovskite precursors

    Composition Dependent Strain Engineering of Lead-Free Halide Double Perovskite: Computational Insights

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    The critical photophysical properties of lead-free halide double perovskites (HDPs) must be substantially improved for various applications. In this regard, strain engineering is a powerful tool for enhancing optoelectronic performance with precise control. Here, we employ ab initio simulations to investigate the impact of mild compressive and tensile strains on the photophysics of Cs2AgB′X6 (B′ = Sb, Bi; X = Cl, Br) perovskites. Depending on the pnictogen and halide atoms, the band gap and band edge positions of HDPs can be tuned to a significant extent by controlling the applied external strain. Cs2AgSbBr6 has the most substantial strain response under structural perturbations. The subtle electronic interactions among the participating orbitals and the band dispersion at the edge states are enhanced under compressive strain, reducing the carrier effective masses. The exciton binding energies for these Br-based HDPs are in the range 59–78 meV and weaken in the compressed lattices, suggesting improved free carrier generation. Overall, the study emphasizes the potential of lattice strain engineering to boost the photophysical properties of HDPs that can ultimately improve their optoelectronic performance

    Inhibition of serum antibodies against N-LDL and G-LDL binding by D-ribose (♦), N-LDL (▴) and G-LDL (▪) respectively.

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    <p>The microtiter plate was coated with D-ribose, N-LDL and G-LDL (10 µg/ml) respectively. Each data represents average of three experiments. The values represent the mean ± SD.</p

    Level of induced antibodies against D-ribose-modified LDL.

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    <p>Direct binding ELISA of D-ribose antisera (□), N-LDL antisera (▴), G-LDL antisera (♦) and preimmune sera (▪). The microtiter wells were coated with D-ribose, N-LDL and G-LDL (10 µg/ml) in direct binding ELISA of D-ribose antisera, native LDL antisera and G-LDL antisera respectively. Each data represents average of three experiments. The values represent the mean ± SD.</p

    Effect of CFA, D-ribose, N-LDL and G-LDL on plasma TBARS and Conjugated Diene (CD) in control and treated NZW female rabbits.

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    <p>Each data represents average of three experiments. The values represent the mean ± SD.</p><p>Effect of CFA, D-ribose, N-LDL and G-LDL on plasma TBARS and Conjugated Diene (CD) in control and treated NZW female rabbits.</p
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