Publications

The present review describes the state of the art of the use of metal organic framework (MOF)-encapsulated Au nanoparticles (NPs) as heterogeneous catalysts. The purpose is to show that catalysts with very good performance, frequently among the most active Au catalysts reported so far, can be obtained by incorporation of Au NPs inside MOFs. The available data indicate that the high catalytic activity of MOF-encapsulated Au NPs derives from (i) small particle size, (ii) high dispersion and homogeneous distribution inside MOFs crystals, (iii) stabilization of particle size by confinement of Au NPs inside MOFs cages, and (iv) the synergy that can arise by the combination of the activity of Au NPs and MOFs. After some introductory sections presenting general issues commenting about the relevance of Au catalysis, how to determine the internal versus external location of Au NPs, and evidence in support for catalyst stability, this mini review covers reactions using Au@MOFs as catalysts for oxidations, reductions, tandem processes, and photocatalysis with the emphasis in providing a comparison with the performance of other alternative Au-containing catalysts. In the final section, we summarize in our view the current achievements and which are the next targets in this area.

In this Letter, for the first time, we demonstrated the preparation of a highly efficient electrocatalyst, spinel CuCo2O4 nanoparticles supported on N-doped reduced graphene oxide (CuCo2O4/N-rGO), for an oxygen reduction reaction (ORR) under alkaline media. The hybrid exhibits higher ORR catalytic activity than CuCo2O4 or N-rGO alone, the physical mixture of CuCo2O4 nanoparticles and N-rGO, and Co3O4/N-rGO. Moreover, such a hybrid affords superior durability to the commercial Pt/C catalyst.

Purpose To discover new photochromic molecules suitable for various applications. Design/methodology/approach The synthesis of the new photochromic Aniline derivatives was accomplished by reaction of tetracyanoquinodimethane and anilines in polar solvents such as dimethylformamide. Findings A novel photochromic system had been designed and developed. The synthesis and photochromic properties of three aniline derivatives upon irradiation with ultraviolet light were studies in different solvents. The photochromic and thermochromic properties were affected markedly upon changing the solvent polarity. The new materials gave colourless to deep yellow coloration upon irradiation with ultraviolet, rendering them suitable candidates for optical storage media using the region of 700 nm. Practical implications A new photochromic system had been developed via a simple method. The new compounds showed photochromic, thermochromic, and solvatochromic properties making them potential candidates for many applications such as photo sensors, optical data storage, thermochromic sensors and heat sensitive materials. Originality/value The photochromic system was novel and hence the photochromic molecules were novel.

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.

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.

Photochromic compounds are compounds with unique properties, where it forms firm, the first form is a form of color can be turned into a form that is colored when exposed to radiation with a wavelength of light is selected. Aelamedasul many compounds derived from aldehydes and substituted Abannzel compound was prepared and then was oxidized to give Aelamedasul polychlorinated compounds as well as Votocromeh Thermukromeh. All of the vehicles that have been prepared using a characterization of the infrared spectrometer and a spectrum of ultraviolet and visible. Compounds were irradiated with ultraviolet rays using (LED UV rays). I have been studying X-ray spectrum of ultraviolet and visible vehicle prepared before irradiation and after irradiation in two lengths and Mveben Alasithonatrajl. Most of the vehicles gave the change of color is clear and visible to the eye color from light yellow to dark purple color when it is irradiated. As well as the kinetic study of the coloring process, and then calculate the half-life of the coloring process and build on these results, the compounds prepared have been encouraging. Have been prepared thin films of poly methyl acrylate Metha saturated compounds that were prepared have been exposing these films to ultraviolet rays showed a color change in a clear and fast. Demonstrating the ease of work and a simple and accessible to all is a cheap and simple.

Here, we present the design, fabrication and characterization of shockproof rubber-jelly (NiPc-CNT-oil) composite-based resistors. To fabricate the resistors, gels of CNT and NiPc with edible oil were prepared and deposited on a flexible rubber substrate using rubbing-in technique. The devices' resistance and impedance were investigated under the effect of pressure, displacement, humidity, temperature and mechanical vibrations. The resistance and the impedance decreased, on average, by 1.08 times under the effect of pressure (up to 850 gf/cm²) and by 1.04 times under the effect of displacement (up to 50 µm). Accordingly, upon increasing the humidity from 60% to 90% RH, the resistance and impedance decreased by up to 1.04 times, while upon increasing the temperature from 25 °C to 43 °C, the resistance and impedances also decreased by up to 1.05 times. Moreover, under the effect of vibration, a decrease in resistance and impedance, by up to 1.03 times, was observed. The investigated samples can potentially be used as prototypes for the development of shockproof jelly electronic-based devices in particular resistors. The technological achievement in the fabrication of these devices is the use of edible organic oil, which allows for the fabrication of uniform jelly films of organic materials that cannot be realized simply by mixing "dry" ingredients. Especially, we highlight that edible organic oil is environmentally friendly, unlike some other inorganic oils that are used in practice.