Synthesis Of Oxide Materials Research Articles

Studying the Quality of Micromixing in a Single-Stage Microreactor with Intensively Swirled Flows

The work considers the results of experimental and numerical study on the hydrodynamic characteristics of a jet vortex reactor mikro-VSA-1, for which one of the application fields is the synthesis of oxide materials (e.g., perovskite-like material for solar panels). The energy-dissipation rate and micromixing quality are studied (by the iodide–iodate method) for various methods of supplying micro-VSA-1 and T-shaped millireactors with solutions. Numerical modeling reveals the volumes with the highest energy-dissipation rate. The quality of micromixing in the micro-VSA-1 is shown to be much higher than in the T-shaped millireactor, due to, among other things, the fact that the zone with the highest energy-dissipation rate is localized near the neck of the micro-VSA-1.

Synthesis of oxide materials in the Mg–Sn–O system for use in composite solid electrolytes

Joint precipitation of tin(IV) and magnesium hydroxides from hydrochloric acid solutions was studied by differential thermal and X-ray diffraction analysis, low-temperature nitrogen adsorption, and electron microscopy. The characteristics of MgSn(OH)6 thermal decomposition products were determined. The results of measuring the ionic conductivity of MgSnO3–CsNO2 composites show that magnesium stannate is promising as a heterogeneous additive to composite solid electrolytes.

Extracellular Synthesis of Silica Oxide Particles by <i>Fusarium oxysporum </i>from Rice Husk Ash

Extracellular synthesis of silica particles was carried out by Fusarium oxysporum mycelia using rice husk ash (RHA) as raw material. RHA before and after bioprocessing was analyzed by SEM and specific surface area. Dissolved silica was quantified using colorimetry. Incubation of rice husk ash with F. Oxysporum at 28°C and pH 6.8 indicated that 80% silica was dissolved and micrographs of RHA before and after reaction with fungi showed that the morphology of silica particles changed and the average size decreased (~600 to ~5 µm). Moreover, specific volume pore of particles was reduced from 0.026 to 0.013 cm3/g and surface area increased from 115 to 125 m2/g. Dissolved silica corresponds to 177 m2/g. It is concluded that synthesis of oxide materials using fungal biotransformation is a viable process to obtain added value products from agro-industrial waste materials.

Recent progress in the synthesis of oxide films from liquid solutions

This review surveys recent advances in the synthesis of oxide materials, primarily as supported thin films but also in other forms such as free-standing films, mesoporous solids, and nanostructured fibers, from liquid (primarily aqueous) solutions. New studies using chemical bath deposition (CBD), liquid phase deposition (LPD), and successive ion layer adsorption and reaction (SILAR) to produce single- and multi-component oxide films, and the role that functionalized substrates can play in these deposition techniques, are surveyed. This review highlights significant new insights that have been gained in areas such as: nucleation and growth kinetics as they pertain to film growth in oxide systems; multicomponent films; the roles of polymers and other organic additives on the film deposition mechanism; and fabrication of patterned films and other advanced material morphologies.

EFFECT OF SINTERING CONDITIONS ON MAGNETIC PROPERTIES OF NANOPARTICLE Mn–Zn FERRITE SYNTHESIZED WITH NITRILOTRIACETATE PRECURSOR METHOD

Nitrilotriacetate precursors have been used for synthesis of oxide materials. High permeability Mn – Zn ferrite with general formula Mn x Zn 1-x Fe 2 O 4 where x=0.3/0.35/0.4/0.45/0.5/0.55/0.6/0.65/0.7 were prepared using this novel method. Formation of cubic spinel structure was confirmed by XRD, which also provided information on formation of fine particle material. The magnetic properties of these materials were investigated after sintering the same at 950°C, 1150°C, 1250°C and 1350°C in nitrogen atmosphere and at 1050°C in air and were found to be interesting.

Precursors for the Synthesis of Ceramic Oxide Materials

Classical techniques for solid-phase synthesis of oxide materials used in the production of ceramics and refractories are revised from the standpoint of thermodynamics and kinetics. The theoretical aspects of alternative methods for the synthesis of powdered materials involving chemical and thermochemical techniques for homogenization of precursor mixtures are discussed and routes to the efficient sintering of ceramic materials with required properties are outlined.