Uniform iron oxide magnetic nanoparticles, with sizes in the range 9–22 nm, have been synthesized by thermal decomposition of an oleate complex 1-octadecene, controlling reaction parameters related to nucleation and growth processes. After transferring water through a ligand substitution process, nanoparticles display very good magneto-thermal properties. The relationship between these properties size distribution particles is discussed. colloidal stability dispersed common biological...

Ultraviolet light emitting diodes (UV-LEDs) are attracting the interest of researchers for design compact photoreactors due to their energy efficiency, life expectancy, flexibility, and easily tuned intensity emission wavelength. However, quasi-point source nature viewing angle dependence these illumination sources, distribution in LED based reactors can be highly inhomogeneous if locations LEDs reactor not carefully designed. This work describes a novel standardized accurate measurements...

This work describes the procedure for simulation of operation a photocatalytic reactor by using multiphysics computational fluid dynamics (CFD) model based on determination intrinsic kinetics parameters in an optically differential photoreactor. The includes rigorous description hydrodynamics, radiation transfer, mass transport and chemical reaction rate mechanistic kinetic model. Possible existence dead recirculation zones has been identified from flow field, showing non-uniform through...

COVID 19 lockdown forced a general move of teaching activities from their on-site mode to remote producing different negative consequences for students. In this work, the use Kahoot! platform was studied keep students' interest during online teaching. For this, games were carried out topics university subject. The data analysis revealed that high participation implies an improvement in final marks. Additionally, questions response time also extracted serving as reference exams. On other...

Our students belong to a highly digitised generation with easy and rapid access information. They are dependent on technology tend become bored quickly. There is an ongoing debate regarding the need reconsider our teaching methods in order capture attention of students. This study surveyed both teachers subject online its impact university education. Additionally, it explored issues related integrating interactive applications These considered essential tools combating student boredom...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation F. J. Teran, C. Casado, N. Mikuszeit, G. Salas, A. Bollero, M. P. Morales, Camarero, R. Miranda; Accurate determination of the specific absorption rate in superparamagnetic nanoparticles under non-adiabatic conditions. Appl. Phys. Lett. 6 August 2012; 101 (6): 062413. https://doi.org/10.1063/1.4742918 Download...

In this study, the degradation of diclofenac (DCF), a frequently detected non-steroidal pharmaceutical, was evaluated by using UV-B and UV-C (265, 285, 310 nm) light-emitting diodes (LEDs) alone in combination with hydrogen peroxide (UV/H2O2) free chlorine (UV/FC). The DCF followed pseudo first-order kinetic, their trend reflected pattern molar absorption coefficients oxidants. A positive synergistic factor found for UV-LED driven advanced oxidation processes almost all cases, but despite...

This work presents the enhanced numerical simulation of radiation transport in three different types photocatalytic reactor using a novel Discrete Ordinate Method model recently developed for open-source Computational Fluid Dynamics (CFD) platform OpenFOAM. The photoreactors represent commonly used geometries and illumination sources field heterogeneous photocatalysis: an annular illuminated by mercury fluorescent lamp, tubular coupled to compound parabolic collector sunlight, LEDs....

This work focuses, for the first time, on mechanistic modelling of wastewater disinfection by solar photo-Fenton process using controlled simulated radiation. At circumneutral pH, iron precipitates forming hydroxides and significantly affecting optical properties water. In this regard, radiation transfer in reactor has been taken into account. The proposed model considers that inactivation bacteria follows a serial n-event mechanism with n reversible steps photonic attacks leading to...

Abstract In this article, magnetite nanoparticles (MNPs) coated with glycopolymer bearing glucose moieties were designed optimal structural, colloidal, and magnetic properties for biomedical applications. MNPs an average size of 17 ± 2 nm synthesized by thermal decomposition process then their surfaces modified active vinyl groups. Two different monomers immobilized onto the surfaces: dopamine methacrylamide, a monomer inspired on mussels adhesive capacity, or unprotected glycomonomer, 2‐{[(...

A novel procedure for the simulation of solar water disinfection (SODIS) processes in flow reactors is presented. The modeling approach includes rigorous description hydrodynamics, radiation transfer, mass transport and bacterial inactivation phenomena within reactor by means a computational fluid dynamics (CFD) software. methodology has been evaluated tubular coupled with compound parabolic collector (CPC). Velocity profiles have validated versus theoretical fully developed flow, fields...

<ns3:p>Background Measurement of light intensity reaching a point interest in complex systems is challenge faced by academia and industry. This study analyzes an optical ray tracing method to predict the radiant germicidal system. Methods Implementation was performed analyzing how compares with discrete ordinate method, radiometry, actinometry. further quantified effect photoreactor quartz tube on measured for multiple wavelengths. Results Light losses were estimated be 10 ± 0.5% FX-1 265...

Abstract A three‐dimensional numerical model was solved for a turbulent incompressible steady flow and the discrepancies similarities between software OpenFOAM® ANSYS® Fluent on modeling were analyzed. The evaluation performed meshing, setup, simulation step of process. Outcomes contrasted with experimental data to validate fluid obtained both softwares. With this aim, an pulse‐response technique applied obtain residence time distribution (RTD) curve be compared RTD curves achieved from...