Abstract In this article, silicotungstic acid (STA)-loaded metal–organic framework (MOF)-derived composites (C-STA@ZrO 2 ) were successfully synthesized by simple strategies. X-ray diffraction, Fourier transform infrared, scanning electron microscopy, energy-dispersive X-ray, N physisorption, UV-vis diffuse reflection spectroscopy, and photoelectron spectroscopy techniques used to characterize ...

A procedure is described for the preparation of ultrathin frozen sections of glutaraldehydefixed or unfixed islets of Langerhans by cryo-ultramicrotomy. Freezing of the tissue was accomplished by direct immersion of isolated islets in liquid nitrogen. Sectioning was performed at a specimen temperature of —80 °C and a knife temperature of —40 °C, the ribbon of sections being collected on a troug...

In this study, the bimetallic Ni-Zr MOF-derived nickel-zirconium oxide (Ni-Zr-O)-impregnated silicotungstic acid (HSiW) nanocomposite catalyst (HSiW@Ni-Zr-O) was prepared via a hydrothermal procedure followed by pyrolysis treatment, and its structural, morphological, surface components oxidation states were characterized using XRD, FTIR, TPD-NH3, SEM, TEM, N2 physisorption, XPS analyses. Then, ...

One-dimensional metal nanostructures are of great interest for applications in electronic and micromechanical devices, solar cells, sensors, heterogeneous (photo)catalysts. We describe the multigram preparation method nanoscopic tungsten fibers (diameter 107 ± 49 nm) first time. The material was prepared by needleless electrospinning from an aqueous polyvinyl alcohol silicotungstic acid solutio...

Abstract In the present study, a facile solvothermal method was used for synthesis of silicotungstic acid (HSiW) immobilized on Ce-based metal organic framework (Ce-BDC) and embedded in Zr-based metal-organic (UiO-66(Zr)) composite catalyst, namely, Ce-BDC@HSiW@UiO-66 production biodiesel through green fatty esterification. The obtained hybrids were characterized by various characterization tec...