A5069873993- Lubricants and Their Additives
- Tribology and Wear Analysis
- Carbon Nanotubes in Composites
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Catalytic Processes in Materials Science
- Metal and Thin Film Mechanics
- Catalysis and Hydrodesulfurization Studies
- Nanoparticles: synthesis and applications
- Transition Metal Oxide Nanomaterials
- 2D Materials and Applications
- Tribology and Lubrication Engineering
- Enzyme-mediated dye degradation
- Electrocatalysts for Energy Conversion
- Nanomaterials for catalytic reactions
- Advanced Photocatalysis Techniques
- Organometallic Compounds Synthesis and Characterization
- Fungal Biology and Applications
- Biochemical and biochemical processes
- Fullerene Chemistry and Applications
- Graphene and Nanomaterials Applications
- Luminescence Properties of Advanced Materials
- Advanced Sensor and Energy Harvesting Materials
- Corrosion Behavior and Inhibition
- Electrospun Nanofibers in Biomedical Applications
Universidad Michoacana de San Nicolás de Hidalgo
2016-2025
Brookhaven National Laboratory
2025
University of Calgary
2010
Since their discovery in 1991 carbon nanotubes (CNTs) have attracted much interest due to remarkable mechanical, thermal, electrical, chemical and optical properties. In connection with mechanical properties, CNTs been studied various forms for tribological applications including use as lubricant additives oil water. this work, the properties of functionalized (single multi-walled) modified carboxylic acid when used at different concentrations (0.01, 0.05%) were under rolling-sliding...
In this study we present the synthesis of erbium, ytterbium and erbium-ytterbium nanoparticles supported on multiwalled carbon nanotubes by a microwave-assisted method as well evaluation their luminescent properties. case ~1 nm homogeneously dispersed were obtained. ytterbium, partially coated with metal. Clusters obtained in co-deposition both metals. The erbium-ytterbium/carbon nanotube composite showed down- up-conversion luminescence. For down-conversion process, strong emission signals...
Biogenesis and recycling of iron-sulfur (Fe-S) clusters play important roles in the iron homeostasis mechanisms involved mitochondrial function. In Saccharomyces cerevisiae, Fe-S are assembled into apoproteins by cluster machinery (ISC). The aim present study was to determine effects ISC gene deletion consequent release under oxidative stress conditions on functionality S. cerevisiae. Reactive oxygen species (ROS) generation, caused H2O2, menadione, or ethanol, associated with a loss...
We report the synthesis of ceria nanoparticles supported on multiwalled carbon nanotubes via a microwave-assisted method. The resulting composites were characterized by HRTEM, XRD, TGA and Raman spectroscopy. This method enabled growth ~1.4 nm homogeneously distributed surface nanotubes. adsorption effectiveness these materials was evaluated using methylene blue as model molecule. produced nanocomposites showed higher dye capability removal percentage (62.1 mg/g, 95.3%) than functionalized...
Carbon nanotubes (CNTs) have a broad range of applications and are generally considered human-engineered nanomaterials. However, carbon nanostructures been found in ice cores oil wells, suggesting that nature may provide appropriate conditions for CNT synthesis. During forest wildfires, materials such as turpentine conifer tissues containing iron under high temperatures create chemical favorable generation, similar to those synthetic methods. Here, we show evidence naturally occurring...
Abstract By impedance spectroscopy, Gonzalez‐Campos et al. J Polym Sci Part B: Phys 2009, 47, 932–943, reported the first evidence of a glass transition in polysaccharide. To gain better understanding on molecular relaxations polysaccharides, we study composites chitosan (CS)/silver nanoparticles (AgnP) films by dynamic mechanical analysis (DMA) and dielectric spectroscopy 2–250 °C temperature range. CS/AgnP conductivity increases two orders magnitude comparison with pristine CS. Three...
ABSTRACT The dielectric and biological properties of chitosan (CTS)‐based nanocomposites were analyzed by spectroscopy, antibacterial antifungal assays. Carbon nanotubes (CNT) CNT decorated with silver nanoparticles (AgnP) incorporated into a CTS matrix at different concentrations to obtain bionanocomposite thin films. conductivity pristine is considerably enhanced, six orders magnitude, the inclusion CNT; however, addition AgnP it only increases two magnitude because strong chemical...
We present a parametric study on the growth of carbon nanotubes (CNTs) by spray pyrolysis biorenewable feedstock obtained from living pine trees, namely α-pinene. The analyzed variables were type catalyst, catalyst concentration, flow reactants, and reaction time; all at fixed temperature 800 °C. evaluation optimization these parameters was performed based yield crystallinity produced CNTs which monitored Raman spectroscopy, thermogravimetric analysis, X-ray diffraction, high resolution...
Lubricants are widely used in industrial machinery order to separate solid tribological surfaces and support high loads under severe conditions. In contacts, viscosity plays an important role the film-forming abilities of lubricant, but this property is strongly dependent on temperature. Consequently, small variations temperature cause appreciable lubricating oils. For reason it practical value be able predict changes with This paper presents a new focus Walther equation determine commercial...
Multi-wall carbon nanotubes (MWCNTs) were prepared by spray-pyrolysis of a botanical hydrocarbon, alpha-pinene and ferrocene as the catalyst at 700–1000°C. The MWCNTs analysed scanning electron microscopy, transmission Raman spectroscopy X-ray diffraction. microscopy studies show formation with diameters between 20 30 nm length greater than 100 µm. revealed that alpha-pinene-grown graphitised showing both D G bands 1330 1590 cm−1, respectively, corresponding intensity band ratio (I D/I G)...
Abstract The chemistry of the different components turpentine and effect temperature on synthesis multi-walled carbon nanotubes (MWCNTs) by spray pyrolysis using ferrocene as catalyst in a range 700–1000°C at 100°C intervals was investigated. Turpentine with high α-pinene concentration (83.4%) low β-pinene (8.22%), well pure β-pinene, were used sources. MWCNTs analyzed scanning electron microscopy, transmission Raman spectroscopy, X-ray diffraction thermogravimetrical analysis. When...
Abstract The molecular dynamics of poly(vinyl alcohol) (PVA) were studied by dielectric spectroscopy and dynamic mechanical analysis in the 20–300°C range. well‐established plasticizing effect water on glass‐transition temperature ( T g ) PVA was revisited. Improper elimination has led to a misinterpretation thermal relaxations such that depressed for wet films (ca. 40°C) been assigned as secondary β relaxation number previous studies literature. In samples, two different...
This paper presents a general mathematical programming formulation to determine the optimal operating conditions synthesize nanofibers through an electrospinning process at minimum cost. Several relationships based on experimental data for different polymers nanofiber diameter and costs are proposed. Also, optimization approach is proposed trade off between cost diameter. A case study including specific three five presented. The general, it can be applied cases.
Multi-wall carbon nanotubes (MWCNT) were prepared by spray-pyrolysis of alpha-pinene, a botanical hydrocarbon, and ferrocene as catalyst at 900 degrees C. The MWCNT analyzed scanning electron microscopy (SEM), high resolution transmission (HRTEM), Raman spectroscopy. studies show the formation with diameters between 20 30 nm length greater than one hundred microns. Nanoparticles detected outside inside identify metallic iron carbide, respectively. spectroscopy reveals that alpha-pinene grown...