A5021361518- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Nuclear Materials and Properties
- Diamond and Carbon-based Materials Research
- Advanced ceramic materials synthesis
- High Entropy Alloys Studies
- Electrochemical Analysis and Applications
- Tribology and Wear Analysis
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- SARS-CoV-2 detection and testing
- Biosensors and Analytical Detection
- Optical Coatings and Gratings
- Advanced Sensor Technologies Research
- Material Selection and Properties
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and interfaces
- Advanced Sensor and Energy Harvesting Materials
- Metallurgical Processes and Thermodynamics
- ZnO doping and properties
- Magnetic and Electromagnetic Effects
- Electrical Contact Performance and Analysis
- Adhesion, Friction, and Surface Interactions
- Advanced biosensing and bioanalysis techniques
Universidad Nacional de Colombia
2012-2025
Pontificia Universidad Javeriana
2021-2024
Abstract Aluminum in its Al 3+ form is a metal that inhibits plant growth, especially acidic soils (pH < 5.5). Rapid and accurate quantitative detection of agricultural critical for the timely implementation remediation strategies. However, detecting ions requires time-consuming preparation samples, using expensive instrumentation non-portable spectroscopic techniques. As an alternative, electrochemical sensors offer cost-effective minimally invasive approach situ quantification ions....
ABSTRACT The effect of iron oxide (Fe₂O₃) deposits on the hot corrosion (HC) mechanisms yttria‐stabilized zirconia (YSZ) thermal barrier coatings in presence vanadium was investigated. experiments involved exposing YSZ samples to pentoxide (V₂O₅) at 900°C for 90 min, both with and without addition Fe₂O₃. Surface cross‐sectional analyses were conducted using optical microscopy, scanning electron microscopy (SEM/EDS), X‐ray diffraction. Additionally, porosity delamination percentages...
A critical path to solving the SARS-CoV-2 pandemic, without further socioeconomic impact, is stop its spread. For this happen, pre- or asymptomatic individuals infected with virus need be detected and isolated opportunely. Unfortunately, there are no current ubiquitous (i.e., ultra-sensitive, cheap, widely available) rapid testing tools capable of early detection infections. In article, we introduce an accurate, portable, low-cost medical device bio-nanosensing electrode dubbed SenSARS...
The pervasive use of portable electronic devices, powered from rechargeable batteries, represents a significant portion the electricity consumption in world. A sustainable and alternative energy source for these devices would require unconventional power sources, such as harvesting kinetic/potential mechanical vibrations, ultrasound waves, biomechanical motion, to name few. Piezoelectric materials transform deformation into electric fields or, conversely, external motion. Therefore, accurate...
Bismuth thin films were grown onto glass substrates through the DC magnetron sputtering technique.The effects of substrate temperature on microstructure evaluated.The structural behavior was analyzed via X-ray diffraction, and it showed a marked influence crystallite size micro-stress.The morphologies evaluated Electron Probe Microanalyzer images indicated slight difference in grain with an increase as well significant surface roughness, according to profilometer measurements.
Heat treatments were carried out at 350, 450, 550 and 650°C on WC-10Co4Cr coatings deposited by High-Velocity Oxy-Fuel (HVOF) onto AISI 420 stainless steel substrate in order to study their influence the abrasive wear resistance of coatings. The thickness microhardness measured while microstructure was analysed with aid OM, SEM XRD techniques. X-ray diffraction results revealed presence W2C phase as-sprayed coatings, WO3 CoWO4 phases after heat treatments. No significant degradation observed...
In this work, titanium doped tungsten disulfide thin films (WS2-Ti) were deposited on AISI 304 stainless-steel substrates using the magnetron co-sputtering DC technique. Films produced with varying titanium-cathode power from 0 to 25 W. The content of WS2 structure was determined energy dispersive spectroscopy (EDS), thereby obtaining a maximum 10% for sample grown at X-ray diffraction (XRD) results indicated, pure sample, presence hexagonal phase high intensity (103) plane. However,...
Titanium-doped tungsten disulfide thin films (WS2-Ti) were deposited using a DC magnetron co-sputtering on AISI 304 stainless steel and silicon substrates. Different Ti cathode power densities between 0 1.25 W/cm2 used for coating deposition. Energy-dispersive spectroscopy evidenced an increase in percentage at the expense of W, as well sulfur deficiency. Raman was to identify bands corresponding W-S undoped WS2. As material doped, changes crystalline structure caused main separate. Scratch...
Molecular dynamics (MD) simulations were carries out for studying the influence of nanoindentation in atomistic deformation mechanisms Cr/CrN and (Cr/CrN)2 coatings with BCC FCC crystalline structures Cr CrN, respectively.The Morse potential was employed order to determine atomic interaction forces Cr-Cr Cr-N atoms.A non-deformable solid sphere implemented determining role nanoindenter.The Oliver-Parr method (OP) used obtain hardness elastic modulus layers, resulting values 18 20 GPa...
El objetivo de este trabajo es estudiar a partir simulaciones el comportamiento mecánico un sistema sustrato/recubrimiento. Se analizan los esfuerzos contacto y la deformación elástica, al aplicar una carga normal superficie compuesto por película delgada resistente desgaste Carburo Tungsteno (WC) sustrato acero inoxidable. análisis se basa en utilizando método Monte Carlo del algoritmo Metrópolis; fenómeno fue simulado estructura cristalina centrada las caras fcc, tanto para recubrimiento...
The effect of the presence iron oxide deposits on hot corrosion resistance YSZ thermal barriers in vanadium was evaluated. In experiments, samples were exposed to pentoxide (V2O5) at 900°C for 90 min with and without addition oxide. tested surfaces cross section evaluated by optical scanning electron microscopy. cross-sectional porosity percentage delamination measured through digital image processing. Microstructural analysis carried out X-Ray Diffraction. Elemental chemical microanalysis...
Aluminum in its Al3+ form is a metal that inhibits plant growth, especially acidic soils (pH < 5.5). Rapid and accurate quantitative detection of Al3+in agricultural critical for the timely implementation remediation strategies. However, detecting ions requires time-consuming preparation samples, using expensive instrumentation non-portable spectroscopic techniques. As an alternative, electrochemical sensors offer cost-effective minimally invasive approach situ quantification ions. Here, we...
Abstract Aluminum in its Al 3+ form is a metal that inhibits plant growth, especially acidic soils (pH < 5.5). Rapid and accurate quantitative detection of agricultural critical for the timely implementation remediation strategies. However, detecting ions requires time-consuming preparation samples, using expensive instrumentation non-portable spectroscopic techniques. As an alternative, electrochemical sensors offer cost-effective minimally invasive approach situ quantification ions....