Murilo B. Valério, Ladimir J. de Carvalho, Eduardo La Marca da Silva, Leila Y. Reznik, Luiz C. Bertolino, Ana L. N. da Silva
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引用次数: 0
Abstract
The present study evaluates the structural transformation of niobium pentoxide (Nb2O5) through reaction with sodium hydroxide (NaOH) under hydrothermal conditions, focusing on the effects of temperature and reaction time on its crystalline morphology. In this parametric study, Nb2O5 particles were reacted with NaOH at 160 °C and 180 °C temperatures and reaction times of 90, 120, and 180 min. The resulting materials were characterized by X-ray diffraction (XRD), laser diffraction particle size analysis (LDPSA), specific surface area analysis (BET), and scanning electron microscopy (SEM). XRD confirmed the formation of NaNbO₃ and highlighted changes in the crystalline structure. LDPSA showed particle size redistribution due to the reaction conditions. BET analysis revealed significant surface area enhancements, with the sample treated at 180 °C for 90 min achieving the highest value. SEM images confirmed morphological changes induced by temperature and reaction time. These results underscore the importance of precise control over synthesis parameters to optimize the textural and structural properties of niobium oxide for advanced applications, such as active polymer packaging systems, catalysis, adsorption, and biomedicine.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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