ARTICLES YOU MAY BE INTERESTED INStudy on the mechanism of a manganese-based catalyst for catalytic NO X flue gas denitration AIP Advances 8, 045004 (2018); https://doi.org/10.1063/1.4989431The effect of surface wettability on the performance of a piezoelectric membrane pump AIP Advances 8, 045010 (2018) Antiferromagnetic and ferrimagnetic microtubes decorated with nanowires have been obtained during thermal oxidation process, which was assisted by in situ electrical resistivity measurements. The synthesis route including heat treatment and electrical current along with growth mechanism are presented. This simple method and the ability to tune in the magnetic moment of the obtained microtubes going from a nonmagnetic-like to a large magnetization saturation open an avenue for interesting applications. In vitro experiments involving adherence, migration, and proliferation of fibroblasts cell culture on the surface of the microtubes indicated the absence of cytotoxicity for this material. We have also calculated both torque and driving magnetic force for these microtubes with nanowires and cells as a function of external magnetic field gradient which were found to be robust opening the possibility for magnetic bio micro-robot device fabrication and application in biotechnology.
SnS and ZnS hollow microarchitectures decorated with nanostructures were synthesized by catalysis free thermal evaporation technique using metal microwires and sulfur powder as starting materials. For SnS, we observed a microtube formation comprised of a thin metallic Sn layer in the inner surface, SnS orthorhombic structure thick layer with SnS nanostructures on the top. For ZnS, we found out the formation of hollow sphere with a thin metallic layer in the inner part, a thick cubic phase layer of ZnS, and on this second phase, nanostructures of ZnS hexagonal crystal phase grew up homogeneously. The surface tension, intrinsic to liquids, induces the formation of a microsphere in ZnS sample in order to minimize the surface area. ZnS and SnS hollow semiconducting microstructures have exhibited efficient activity to degrade the methylene blue under simulated sunlight irradiation. The results reveal that ZnS microstructures have higher photoactivity to organic degradation when compare to SnS in the same time interval. The observed results demonstrate the potential of thermal evaporation process without any catalyst material as a simple, fast and efficient route to obtain hollow hierarchically micro/nano architectures of SnS and ZnS with enhanced photocatalytic activity.
La dosimetría Fricke es una técnica con múltiples aplicaciones, desde la industria alimentaria hasta la medicina. En las actividades cotidianas de la planta de irradiación gamma del Servicio Geológico Colombiano (SGC) se usan diferentes sistemas dosimétricos para el estudio de las dosis absorbidas en los materiales, entre ellos el sistema dosimétrico Fricke. En este trabajo se realizó la comparación de la dosis absorbida determinada en el Laboratorio Secundario de Calibración Dosimétrica (LSCD), a partir de patrones trazables calibrados en el Organismo Internacional de Energía Atómica (OIEA), y la aplicación del protocolo IAEA TRS 398, en el irradiador G100 Hopewell Design que contiene una fuente de Co-60, con las dosis obtenidas mediante el sistema Fricke usado rutinariamente. Se aplicaron los protocolos establecidos en la norma ISO-STM 51026 “Práctica estándar para el uso del sistema de dosimetría Fricke”. Se elaboró la curva de calibración de los dosímetros Fricke, de la cual se obtuvo el parámetro experimental para el cálculo de la dosis absorbida en las condiciones ambientales particulares de la instalación; el sistema mostró un comportamiento lineal en el rango de 100 Gy a 350 Gy. Teniendo en cuenta el valor experimental de dosis obtenido con dicho sistema, se realizó la intercomparación con la dosis conocida determinada en el LSCD obteniendo una diferencia en el rango de dosis mencionado no mayor al 3,7 % y una incertidumbre del 3 % con una confiabilidad del 95 %.
A partir del valor experimental encontrado y que la instalación planta irradiación gamma se encuentra en similares condiciones ambientales que el laboratorio secundario de calibración y que los irradiadores de estas instalaciones suministran sus dosis de manera similar, se puede construir un procedimiento propio para el cálculo de la dosis, el cual permitirá mayor precisión y operatividad a la dosimetría de la instalación.
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