A5006984179- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Nanoparticles: synthesis and applications
- Semiconductor materials and devices
- Mechanical and Optical Resonators
- Advanced Sensor and Energy Harvesting Materials
- Analytical Chemistry and Sensors
- Science, Technology, and Education in Latin America
- Integrated Circuits and Semiconductor Failure Analysis
- Electrochemical sensors and biosensors
- Near-Field Optical Microscopy
- Graphene and Nanomaterials Applications
- Microwave Engineering and Waveguides
- Advanced MEMS and NEMS Technologies
- Nanotechnology research and applications
- Biosensors and Analytical Detection
- Terahertz technology and applications
- Carbon Nanotubes in Composites
- Advanced biosensing and bioanalysis techniques
- Higher Education and Sustainability
- Advancements in Semiconductor Devices and Circuit Design
- Antenna Design and Analysis
- Metamaterials and Metasurfaces Applications
- Electrohydrodynamics and Fluid Dynamics
- Smart Cities and Technologies
Universidad de Los Andes
2016-2025
The University of Texas at Arlington
2024
Universidad de Granada
2024
Institut d'Investigació Sanitària Pere Virgili
2021-2023
Clínica Alemana
2020-2023
Universidade Federal do Rio Grande do Sul
2023
Universidad del Desarrollo
2020-2023
Pontificia Universidad Javeriana
2023
Universidad de Los Andes
2005-2021
Universitat Rovira i Virgili
2021
High-resolution sub-surface imaging of carbon nanotube (CNT) networks within polymer nanocomposites is demonstrated through electrical characterization techniques based on dynamic atomic force microscopy (AFM). We compare three implemented in the single-pass configuration: DC-biased amplitude modulated AFM (AM-AFM), electrostatic (EFM) and Kelvin probe (KPFM) terms physics image formation experimental robustness. The methods were applied to study dispersion single-walled nanotubes (SWNTs) a...
We study the depth sensitivity and spatial resolution of subsurface imaging polymer nanocomposites using second harmonic mapping in Kelvin Probe Force Microscopy (KPFM). This method allows visualization clustering percolation buried Single Walled Carbon Nanotubes (SWCNTs) via capacitance gradient (∂C/∂z) maps. develop a multilayered sample where thin layers neat Polyimide (PI) (∼80 nm per layer) are sequentially spin-coated on well-dispersed SWCNT/Polyimide nanocomposite films. The...
A conductive tip in an atomic force microscope (AFM) has extended the capability from conventional topographic imaging to electrical surface characterization. The acts as a voltage electrode provide stimuli and monitor properties. In this review article, we have organized AFM techniques based on whether properties are monitored at cantilever or across sample. Furthermore, probe detection signal. number of acronyms used literature, more commonly ones identified. principle each technique is...
Growing antimicrobial resistance is considered a potential threat for human health security by organizations, such as the WHO, CDC and FDA, pointing to MRSA an example. New antibacterial drugs complex derivatives are needed combat development of bacterial resistance. Six new copper cobalt complexes azole were synthesized isolated air-stable solids characterized melting point analyses, elemental thermogravimetric analyses (TGA), infrared ultraviolet/visible spectroscopy. The spectral data...
The conventional approaches to assess the potential cytotoxic effects of nanomaterials (NMs) mainly rely on in vitro biochemical assays. These assays are strongly dependent properties nanomaterials, for example; specific surface area (SSA), size, defects, and charge, host response. NMs can also interfere with reagents optical leading skewed interpretations ambiguous results related toxicity. Here, we proposed a structured approach cytotoxicity assessment complemented cells' mechanical...
The global commitment to ending hunger by 2030 has driven Colombia align its Sustainable Development Goals (SDGs) toward reducing food waste and ensuring access safe, nutritious food. A critical need is monitoring cumulative temperatures across supply networks, prioritizing products over transport or storage infrastructure. This study introduces a Functional Time-Temperature Indicator (TTI) using nanodispersions of silver (Ag) gold (Au) nanoparticles housed in 3D-printed plant-based resin...
This study addresses the increasing global need for upper limb prostheses (ULPs), particularly those controlled by electroencephalogram (EEG) signals, due to rising number of amputations. Focusing on an EEG signal acquisition system integrated with a machine learning (ML)-driven pattern recognition framework, research investigates control robotic ULP. The is divided into two phases: data and using ensemble K-nearest neighbors (KNN), support vector machines (SVM), artificial neural networks...
Four new zinc complex derivatives of azoles and ligands were synthesized isolated as white air-stable solids characterized by elemental analyses, thermogravimetric analysis (TGA), infrared spectroscopy, nuclear magnetic resonance (NMR) mass spectra.The analysis, theoretical calculations NMR show that the complexes likely have a 1:1 (M:L) stoichiometry tetrahedral geometry.To evaluate biological activity to discuss role metal ions structural properties, their been studied.Their antimicrobial...
Gold nanoparticles (AuNPs) are extensively employed in colorimetric sensing, taking advantage of their optical properties to detect variables via observable color changes. These primarily driven by localized surface plasmon resonance (LSPR), particularly pronounced AuNPs within the visible spectrum. In this study, were synthesized pulsed laser ablation liquids (PLAL) with a pulse energy (Ep) ranging from 25 mJ 75 mJ. Size distributions, hydrodynamic diameters, polydispersity indices (PDI),...
Nerve Growth Factor (NGF) and its high-affinity receptor tropomyosin kinase A (TRKA) increase their expression during the progression of epithelial ovarian cancer (EOC), promoting cell proliferation angiogenesis through several oncogenic proteins, such as c-MYC vascular endothelial growth factor (VEGF). The these proteins is controlled by microRNAs (miRs), miR-145, whose dysregulation has been related to cancer. aims this work were evaluate in EOC cells whether NGF/TRKA decreases miR-145...
HDL particles may act to buffer host cells from excessive inflammatory mediators. The aim of this study is investigate if the lipid profile provides a prognostic biomarker for COVID-19 outcomes.This was prospective characteristics 125 adult patients with performed on day admission analyzed regard clinical outcomes.Seventy-seven (61.2%) were men, mean age 66.3 (15.6) years. 54.1% had bilateral pneumonia. all-cause mortality rate during hospitalization 20.8%. We found direct association...
Batteries are the heart and bottleneck of portable electronic systems. They power electronics determine system run time, with size volume determining factors in their design implementation. Understanding material properties battery components—anode, cathode, electrolyte, separator—and interaction is necessary to establish selection criteria based on correlations metrics: capacity, current density, cycle life. This review studies used four components from perspective impact seven ions (Li+,...
Gold nanoparticles (AuNPs) are commonly synthesized using the citrate reduction method, reducing Au3+ into Au1+ ions and facilitating disproportionation of aurous species to Au atoms (Au0). This method results on citrate-capped AuNPs with valence single states Au0. Here, we report a methodology that allows obtaining by dewetting process three different (Au3+, Au1+, Au0), which can be fine-tuned ion bombardment. The chemical surface changes binding state NPs were investigated core-level X-ray...
A methodical study of the thermal properties a hydrogen molecular ion strongly confined in flat semiconductor quantum ring under external probes: intense laser-field radiation and static electric fields were carried out. The corresponding Schrödinger equation for these two coupled donors system was numerically solved by using finite element method within effective mass approximation. effects donor angular radial positions on entropy, heat capacity internal energy analysed. Results show that...
An animal model of voluntary oral morphine consumption would allow for a pre-clinical evaluation new treatments aimed at reducing opioid intake in humans. However, the main limitation rodents is its bitter taste, which strongly aversive. Taste aversion often overcome by use adulterants, such as sweeteners, to conceal taste or bitterants alternative bottle equalize aversion. adulterants' presence cause choice and, upon removal, preference not preserved. Thus, current models are suitable study...
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...
Heavy metal pollution is posing a severe health risk on living organisms. Therefore, significant research efforts are focused their detection. Here, we developed sensing platform sensor for the selective detection of lead(II) acetate. The based self-assembled polyethyleneimine-functionalized carbon nanotubes (PEI-CNTs) and graphene oxide films deposited onto gold interdigitated electrodes. graphene-based nanostructure showed resistive behavior, fabricated layer-by-layer film was used to...