A5058566786- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- biodegradable polymer synthesis and properties
- Carbon dioxide utilization in catalysis
- Molecular Junctions and Nanostructures
- Analytical Chemistry and Sensors
- Carbon and Quantum Dots Applications
- Surfactants and Colloidal Systems
- Graphene and Nanomaterials Applications
- Particle accelerators and beam dynamics
- Nanoplatforms for cancer theranostics
- Polymer Surface Interaction Studies
- Electrochemical sensors and biosensors
- Plasma Diagnostics and Applications
- Mass Spectrometry Techniques and Applications
- Electrochemical Analysis and Applications
- Advanced Chemical Physics Studies
- Advanced Cellulose Research Studies
- Collagen: Extraction and Characterization
- Nanocluster Synthesis and Applications
- Arsenic contamination and mitigation
- 3D Printing in Biomedical Research
- Thermography and Photoacoustic Techniques
Universidad Yachay Tech
2018-2023
First Technical University
2021
Escuela Superior Politecnica del Litoral
2019
EIA University
2018
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación
2015
Instituto Venezolano de Investigaciones Científicas
1982-2009
Simón Bolívar University
2006
Petroleum of Venezuela (Venezuela)
2000-2003
Florida International University
1992-1994
Institute of Science and Technology
1981
Microbial diseases have been declared one of the main threats to humanity, which is why, in recent years, great interest has generated development nanocomposites with antimicrobial capacity. The present work studied two magnetic based on graphene oxide (GO) and multiwall carbon nanotubes (MWCNTs). synthesis these consisted three phases: first, iron nanoparticles (MNPs), second, adsorption photosensitizer menthol-Zinc phthalocyanine (ZnMintPc) into MWCNTs GO, third phase, encapsulation poly...
Rechargeable zinc-air batteries are promising for energy storage and portable electronic applications because of their good safety, high density, material abundance, low cost, environmental friendliness. A series alkaline gel polymer electrolytes formed from polyvinyl alcohol (PVA) different amounts terpolymer composed butyl acrylate, vinyl acetate, neodecanoate (VAVTD) was synthesized applying a solution casting technique. The thin films were doped with KOH 12M, providing higher amount...
A hydrogen peroxide (H2O2) sensor and biosensor based on modified multi-walled carbon nanotubes (CNTs) with titanium dioxide (TiO2) nanostructures was designed evaluated. The construction of the performed using a glassy (GC) electrode TiO2-CNT film Prussian blue (PB) as an electrocalatyzer. same also employed basis for H2O2 through further modification horseradish peroxidase (HRP) immobilized at TiO2-fCNT film. Functionalized CNTs (fCNTs) TiO2-fCNTs were characterized by Transmission...
Grafting of polyethylenes is an important method used in the modification polyolefins with functional groups. Lately, use extruders as polymerization reactors has increased considerably. However, knowledge details reaction extruder still limited. In this investigation, grafting various commercial polyethylenes, high-density (HDPEs), and linear low-density (LLDPEs) diethyl maleate (DEM) was carried out two corotating twin-screw different screw configurations extrusion conditions. Two...
Polymeric carbon nitride doped with copper through a solid-state reaction was characterized by several techniques, among them are UV-visible spectroscopy, infrared X-ray photoelectron etc. The material is semiconductor wide band gap of 2.74 eV. Sites both Cu(I) and Cu(II) were detected, apparently only coordinated the polymer. comprises crumpled nanosheets, substantially an amorphous layered prevalent 2D structure low inter-planar interactions, as shown diffractometry TeraHertz spectroscopy....
Abstract Summary: Different kinds of polyethylene and ethylene‐1‐hexene copolymers were synthesized with TpTiCl 2 (OR) (Tp = hydrotris(pyrazolyl)borate; R Et, i‐Pr, n‐Bu) catalysts without H . The polymers characterized by 13 C NMR, capillary viscosimetry or GPC, DSC. homopolymers showed properties characteristic ultra‐high molecular weight polyethylenes (UHMWPE) linear structure high density (HDPE) weights in the range commercial grades under hydrogen atmosphere. a 1‐hexene incorporation up...
The treatment of several diseases requires drugs commonly administered orally or intravenously. Said administration has drawbacks, such as low control the necessary drug levels in plasma, making ineffective and, furthermore, side effects and compatibility with patient. Recently, use stimuli-responsive hydrogels controlled Drug Delivery Systems (DDSs) been considered an excellent alternative because its inherent biocompatibility, responsiveness to physiological changes body, diversity both...
Microbial diseases have been declared one of the main threats to humanity, which is why, in recent years, great interest has generated development nanocomposites with antimicrobial capacity. In present work, two magnetic nanocomposites, based on Graphene Oxide (GO) and Multiwall Carbon Nanotubes (MWCNTs) were studied. The synthesis these consisted three phases: first, Iron Magnetic Nanoparticles (MNPs) was carried out presence MWCNTs GO using Co-precipitation method. second phase adsorption...
Recycling waste plastics will support the preservation of natural resources and energy consumption. New challenges arise for development products that take advantage solid waste. Upgrading recycled using nanotechnology can tailor consequently improve plastic properties industrial applications. This research aims to process relate morphology thermo-mechanical high-density polyethylene (rHDPE) terephthalate (rPET) clay nanocomposites. Blends rHDPE (75 wt %) coming from packaging rPET (25...
A superthermal component in a metastable ${\mathrm{Kr}}^{+}$ krypton beam produced Kr gas discharge has been observed and studied. Evidence is presented that this fast due to dissociative recombination of ${\mathrm{Kr}}_{2}^{+}$, the excited direct products reaction are predominantly 5s states. An effective method (time flight) for studying product states reactions thus demonstrated.
The melting behavior of two 1-octene linear low-density polyethylene (LLDPE) copolymers is investigated. One made using Dow′s INSITE constrained geometry catalyst technology (LLDPE-A) and the other titanium-based Ziegler–Natta catalysts (LLDPE-B). Both have similar comonomer content as well melt flow index. Differential scanning calorimetry (DSC) was used throughout work. Isothermal crystallizations in DSC for several times were carried out at various temperatures between 90 100°C LLDPE-A...
Collagen/hydroxyapatite hybrids are promising biomimetic materials that can replace or temporarily substitute bone tissues. The process of biomineralization was carried out through a double diffusion system. methodological principle consisted in applying an electric field on the incubation medium to promote opposite migration ions into collagen membranes form hydroxyapatite (HA) membrane. Two physically separated solutions were used for medium, one rich phosphate and other calcium ions,...
The circular economy promotes the recycling of plastics to develop new materials and products. blends immiscible increase availability raw materials. This research aims process relate morphology, rheological thermo-mechanical properties recycled high density polyethylene (rHDPE) polypropylene (rPP) modified by addition commercial organoclays (OMMT) olefin block copolymer (OBC) compatibilizer. Given amounts post-consumer rHDPE coming from packing rPP lids were mixed in a torque rheometer....
Abstract A series of styrene‐vinylferrocene random copolymers is synthesised and characterised. Their adsorption from carbon tetrachloride chloroform measured on to pyrogenic SiO 2 , TiO Al O 3 . The level depends the solvent, adsorbent copolymer composition. From chloroform, very few vinylferrocene units are required increase markedly above that polystyrene, further compositional change has little effect adsorption. dependence more complex. 1 H NMR studies show a high proportion repeating...
The nature of the electron density localization in two MoS<sub>2</sub>nanoclusters containing eight rows Mo atoms, one with 100% sulphur coverage at edges (<italic>n</italic>8_100S) and other 50% (<italic>n</italic>8_50S) was studied using a localized-electron detector function defined local moment representation.