Patricia Popoola

Patricia Popoola
Tshwane University of Technology | tut · Department of Chemical and Metallurgical Engineeirng

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474
Publications
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4,960
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Publications

Publications (474)
Article
The separation and extraction of Nb/Ta metallic elements from mineral deposits have become challenging, involving complex and complicated separation process routes from the rest of the gangues/impurity elements composed in the ore mineral or deposit and from the value metals/elements themselves. Due to the presence of numerous impurities such as: r...
Article
This study presents functionalized carbon nanotubes (CNTs) decorated with functionalized barium titanate (BT) (denoted as BT@CNTs) via hydrothermal and self-assembly methods to improve dispersion in polypropylene (PP) matrix with enhanced thermal, mechanical, and thermomechanical properties. The CNTs, BT, and BT@CNTs with the addition of polypropyl...
Article
Full-text available
In recent years, epoxy composites have been found as a great composite material in the design and fabrication of parts for industrial applications, owing to their cost-effectiveness, ease of processing, and excellent properties. However, reports have it that epoxy nanocomposites still face properties degradation on exposure to lightening strikes du...
Article
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Carbon-based percolative polymer nanocomposites have shown high capability of large dielectric constant (εI) output. However, such nanocomposites are associated with high dielectric loss (εII) and low voltage strength (Eb). These practically prevent their application as capacitive energy storage materials. This study addressed these hurdles by asse...
Article
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This study further enhanced nanomechanical properties of poly (vinylidene fluoride) (PVDF) using hybrid graphene nanoplatelets (GNPs) and titanium dioxide (TiO2) nanopowder. The hybrid nanocomposites were prepared via solution blending and melt-mixing techniques. GNPs and TiO2 nanopowder were surface modified to promote compatibility with the PVDF...
Article
Various dimensional structured inorganic nanoparticles have different ways of improving mechanical properties of polymeric materials. However, there are limited studies on hybridization of different nanoparticles with different dimensional structures for optimal enhancement of mechanical properties of polymer matrix. Therefore, this study combined...
Article
Polypropylene (PP) has a wide range of engineering applications in automobile, biomedical, energy, machine parts, electronic packaging etc. However, PP lacks some desired engineering properties such as good thermal properties and mechanical strength. For instance, PP is known for its low melting temperature, high flammability and low heat resistanc...
Article
This study reports advanced polypropylene (PP) dielectric nanocomposites achieved with self-assembled carbon nanotubes (CNTs)/barium titanium (BT) and graphene nanosheets (GNs)/boron nitride (BN) nanoparticles. This was to effectively insulate CNTs with BT (BT@CNTs) and GNs with BN (BN@GNs) to mitigate energy dissipation, enhance energy density and...
Article
The paper aims to study the thermo-mechanical analysis of a two-dimensional (2D) convex structural design sensitivity for typical engineering component application. COMSOL Multiphysics 5.3a was used to analyze the stress distribution, displacement along with thermal distribution of the component during high temperature application. The computationa...
Article
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Polyimide nanocomposites have drawn much attention as mechanical, thermal, and electrical insulation materials due to its superior dielectric, thermal stability, and corona resistance properties. The polyimide nanocomposites are defined as substance of polyimide matrix reinforced with certain weight percent of nanofillers. Researchers have demonstr...
Article
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Electricity availability and affordability have been the bane of the global industrial growth, especially in the third world countries. Studies have shown that poor maintenance/upgrade of transmission conductors (TCs) is one of the major causes of epileptic power supply. Irregular supply of electricity hampers economic growth and industrial develop...
Article
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In this work, an equi-atomic AlCrFeMnNiV HEA was synthesized by means of arc-melting and casting processes. The casted alloy ingots were heat-treated (annealed) at temperatures of 400, 600 and 800 ºC, for 2 h. The effect of the heat-treatment temperature on the HEA microstructural evolution, compressive strength and corrosion behavior was investiga...
Article
Mild steels are applied in the construction of oil platforms and pipelines due to their ease of form- ability, machinability, good mechanical properties, availability and low cost. However, they are still suscepti- ble to corrosion attack and the cost implication of addressing failed components resulting from corrosion are enormous. The aim of this...
Preprint
The enhancement of wear performance of steel baseplate for tillage application was carried out by manufacturing vanadium-chromium carbide coatings in situ by powder infusion of high carbon ferrochrome FeCrV15 powder through laser additive manufacturing. The developed samples were subjected to various microstructural investigations, microhardness an...
Article
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Development of titanium aluminide (Ti-Al) based alloys has generated a huge interest for many high temperature industrial applications due to their extensive properties. Ti-Al has useful properties in terms of high temperature stability and enhanced strength. Additive Manufacturing (AM) using Laser Engineered Net Shaping (LENS) is breaking the edge...
Article
In this study, experimental investigation and numerical simulation of the compressive stiffness, effective plastic stress-strain behaviour, the hardness and thermal stability of tin alloy parts subjected to equal channel angular extrusion (ECAE) process were investigated. The numerical simulation was carried out using Automatic Dynamic Incremental...
Article
Full-text available
Al–SiC composite coatings were successfully fabricated on 316L stainless steel substrate using laser cladding technique. The microstructure of the coatings was characterized by Scanning electron microscope (SEM) together with energy-dispersive spectrometer (EDS), while the phases that formed were identified using x-ray diffractometer (XRD) equipmen...
Article
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In this study, we investigate the influence of in situ reactive synthesis of Ti6Al4V- AlCoCrFeNiCu high entropy alloys by laser metal deposition on the microstructural and mechanical properties of the as-built alloy as opposed to the traditional method of mixing powders via a ball mill prone to contamination and segregation. We explore the capabili...
Article
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The corrosion of metallic material is a global scientific setback affecting all areas of engineering and technology. Therefore, research on corrosion and its inhibition is of great interest in a wide range of disciplines. The toxic nature and the low inhibition effectiveness of the majority of the conventional organic molecule in inhibiting metals...
Article
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Farming tools are often exposed to high wear rate in dry agricultural land areas. This makes the farming activity to have problems of recurrent labour, idle time, and the extra expenses in replacing the damaged implements like ploughshares. Damaged tools end up in poor tillage, poor planting efficiency, and higher fuel costs. The major phenomena re...
Article
Full-text available
Epoxy nanocomposites are progressively used in the field of mechanical friction because of their unique advantages of lightweight, high strength, wear resistance, and resistance to load. Reports have it that epoxy nanocomposites do face mechanical properties degradation, hence limit their friction and wear performance over a long period of exposure...
Article
The increasing manufacturing technologies are a crucial aspect of industrialization. Laser additive manufacturing is the process of manufacturing using laser (heat) technology to manufacture components from scratch and or strengthening and repairing components with the aid of functionally graded material to upgrade the properties of the components....
Article
Full-text available
In recent years, glass fiber-reinforced epoxy composites have been proven to be a promising material for use in fabricating insulator core rods for high-voltage transmission lines. Composite insulator core rods are reportedly degrading during its application due to poor interfacial bonding, brittle fracture, stress corrosion cracking, water absorpt...
Chapter
Innovative membrane processes are considered a very important segment of controllable separation processes, such as water treatment, gas separation and organic purification. One of the challenges in membrane technology is the challenge of selecting and fabricating membrane material for excellent selectivity and good permeability for selected partic...
Preprint
Full-text available
Laser cladding is an additive manufacturing technology that can be utilized in surface strengthening, modification, and repair of components that are subjected to adverse working conditions. This can be accomplished by the addition of functionally graded material with a remarkable limit to enhancing an engaged credited property of monolithic materi...
Article
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Purpose This study aims to review the recent advancements in high entropy alloys (HEAs) called high entropy materials, including high entropy superalloys which are current potential alternatives to nickel superalloys for gas turbine applications. Understandings of the laser surface modification techniques of the HEA are discussed whilst future reco...
Preprint
Full-text available
The increasing manufacturing technologies is a crucial aspect of industrialization. Laser additive manufacturing is the process of manufacturing using laser (heat) technology to manufacture component from scratch and or strengthening and modification of surfaces that are subject to abrasion. The combination of both Chromium Carbide (CrC) and Vanadi...
Conference Paper
Full-text available
The increasing use of mild steel in diverse environments and under different conditions requires the increased interest in research into these groups of specific steels with attention to their moderate corrosion rate and performance. The electrochemical study of Ni-Cr2O3/SnO2 coating was studied using potentiodynamic techniques. The microhardness p...
Conference Paper
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The need for new advanced high temperature materials is in high demand. High Entropy Alloy (HEAs) has been described to possess excellent mechanical oxidation and good corrosion resistance properties even far above the ambient temperature. Attempts are made in this research to study the corrosion, oxidation, microhardness and densification properti...
Article
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Dye-sensitized solar cells (DSCs)as photovoltaics have been subject of intensive research in the last two decades owing to their outstanding features of relative thermal stability, low cost, optical tunability, ability to operate under conditions of poor lighting, and environment friendliness as such, they offer a promising substitute for conventio...
Article
The inhibition of pure aluminium alloy at a varying concentration of Metronadiazole (MNZ) in 0.5M H 2 SO 4 solution has been studied using electrochemical techniques. The obtained results unveil a decrease in the corrosion rate and high inhibition efficiency values with an increase in the Metronadiazole concentration in the corrosive solution. The...
Article
The anti-corrosion performance of Ibuprofen (IP) on 430T 1 stainless steel samples exposed to 0.5 M H 2 SO 4 solutions was evaluated employing electrochemical techniques. The results obtained validated the inhibitive performance of this compound, and the compound efficiency increased with increasing its concentration. The compound enhances the stai...
Article
The extensive usage of aluminium based composites are seen in automobile industry, aviation, marine, and general structural engineering applications due to their distinctive features that cannot be observed in individual constituent materials. Aluminium form the continuous matrix phase and other discontinuous reinforcing materials are incorporated...
Article
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Bandgap an intrinsic property of molecules on nanoscale, has capability of making alterations in the characteristics of the material through cataclysmic changes from interaction with light. Ultraviolet spectrographs of three organic extracts were explored for their optical frequency and possible use as communication organic optical fiber. The bandg...
Article
Currently, the yield of metallic chromium from ferrochromium (FeCr) in Creusot Loire Uddeholm converter (hereafter abbreviated as CLU), is below optimum, owing to poor oxidation of FeCr feed. Consequently, oxygen not only reacts with carbon but chromium too, thereby causing a reduction in yield of metallic chromium. Howbeit, the focus of this resea...
Article
Corrosion of mild steel via chemical reaction in a corrosive environment is a problematic occurrence that is very common in oil and gas industries. Corrosion constitutes a huge part of the total costs in the production of oil and gas. Corrosion inhibitors have found interest in the scientific domain because they are mainly understood by their chemi...
Presentation
Full-text available
In a previous study, the laser-deposited AlCoCrFeNiCu and AlTiCrFeCoNi High Entropy Alloys showed promising mechanical properties for aerospace applications after using preheating temperature at 400℃ as the laser parameters optimization tool. Using the optimized laser parameters, this study examines the thermal responses and the corrosion behaviour...
Article
The inhibition effect of Cefalexin on mild steel corrosion in sodium chloride has been examined with the use of electrochemical potentiodynamic polarization techniques, weight loss measurements and computational studies. Cefalexin showed good protection ability by adsorbing onto the mild steel surface. The mixed inhibition characteristics of Cefale...
Preprint
Full-text available
The effects of different combinations of spark plasma sintering parameters: temperature, pressure, heating rate and holding time, at three levels on the microstructure, densification, mechanical and wear properties of Ti6Al4V/ h -BN binary composite were considered in this work. The design method of Taguchi and signal-to-noise (S/N) ratios analysis...
Article
Full-text available
AlCrFeNiCuWx high entropy alloys were fabricated on 316L stainless steel substrate using laser metal deposition technique. The microstructural and mechanical characteristics of these alloys were studied by advanced characterization techniques. The results revealed that the alloys exhibited a dual phase structure with BCC (body centered cubic) and F...
Article
Agricultural wastes have inspired new opportunities for the production of eco-friendly, cheap and sustainable inhibitor for engineering materials. In this study, we examined the adsorption and corrosion inhibitive performance of palm kernel shell extract (PKSE) as an environmentally friendly corrosion inhibitor on stainless steel (SS) in a simulate...
Article
Full-text available
Ti10Fe5Si5Cr3Nb composite coatings were fabricated using laser cladding technique. Laser power was varied from 800W to 1200W while the scanning speed was kept constant at 1.5 m/min. The microstructural analysis of the samples was conducted by using optical microscope, X-ray diffractometer and scanning electron microscope coupled with energy dispers...
Conference Paper
Full-text available
An estimated140 billion metric tons of agricultural waste is produced yearly due to the increase in the number of activities that occurs in the agricultural sector. Most of these wastes are sourced from agricultural produce which includes wheat and rice husk and straw, groundnut shell, sugarcane bagasse, jute fiber, coconut husk and so on. However,...
Conference Paper
Petroleum pipelines provide a safe and economical way of transporting commodities such as natural gas and crude oil in large volumes. They form part of a large and complex infrastructure that connects raw resources, processed products and consumers together. This has made pipeline an integral part of the oil and gas industries. API grade pipelines...
Article
Full-text available
The comprehensive properties exhibited by dual-phase high-entropy alloys (HEA) increase their prospects of finding use in engineering applications. However, the distribution of the phases that are present in the alloys has a significant effect on their mechanical performance. Therefore, the homogeneity of microstructure in these alloys remains crit...
Conference Paper
Full-text available
In this study, a two factorial model was developed to optimise the laser additive manufacturing parameters used in fabricating an equimolar AlCoCrFeNiCu High Entropy Alloy. This laser deposition method uses several processing parameters which influences the clad geometry and surface quality of the deposits. Therefore, process parameter optimisation...
Article
Full-text available
Mining is very vital to the production of goods, services and infrastructure; it advances the quality of lives in the society. However, the possible hazard of waste and radioactivity generated by mining, dumping and tailing, has called on the society to find ways of seeking remedy that will adequately treat mining waste from mine dump, tailing and...
Article
Full-text available
AlCrFeNiCuNb x (x = 1at%, 3at%, and 5at%) high-entropy alloys (HEAs) were successfully fabricated using the laser metal depos-ition technique. The laser power of 1600 W and scanning speed of 1.2 m/min were used during laser processing of the alloys. The microstruc-tural, mechanical, and electrochemical characteristics of the alloys were evaluated u...
Article
AA8011-5 wt% Si3N4, AA8011-10 wt% Si3N4, AA8011-15 wt% Si3N4, and AA8011-20 wt% Si3N4 were developed via two-steps stir casting route of liquid metallurgy. The influence of the inclusion of the non-conductive inorganic nano ceramic Si3N4 on the thermal properties, electrical behavior, and corrosion resistance performance of the conductive AA8011 ma...
Article
The construction industry is one of the significant sources of greenhouse gas (GHG) emissions globally. Scientists are searching for advanced materials that can replace scarce natural resources, cumbersome and costly materials, and minimize CO2 emission by reducing the cement content in building materials with more eco-friendly materials. These adv...
Article
Composites of ternary blend of chitosan/sisal fiber/high density polyethylene, were prepared by using the Rheomixer, followed by hot press, in order to form dense microfiltration membranes. The effective operation of the membranes was tested via the utilization of distilled water. The structural arrangement of the membranes was examined with the ai...
Article
The rough morphological structure of ternary blend composite membranes was studied. The surface roughness of the composites were analysed. Recurrent topographies and the reliance of length-scale on rough surfaces were established in the analysis done by scanning probe electron microscopy. The membranes with increasing amount of sisal fibre exhibite...
Article
This study focused on the influence of composite materials on electrodeposition process. The exploit of composite materials due to their exceptional characteristics such as, aesthetic beauty, mechanical performance or electrochemical stability can never be over emphasized. While electrodeposition is seen a unique method for surface improvement deve...
Chapter
Wear-resistant materials (WRMs) have attracted enormous attention because of their general usages in the biomedical, medical, military, automotive, aerospace, and other industrial sectors. The wear of an article causes persistent devaluation, at the same time, but more importantly, wear can make a component become ineffective or vulnerable to sudde...
Article
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j m a t e r r e s t e c h n o l. 2 0 2 0;9(x x):7529-7539 w w w. j m r t. c o m. b r Failure Cast iron a b s t r a c t The phenomenon of chemical degradation of mild steel materials under ethanol environment is becoming alarming. In order to study the electrochemical, thermal and mechanical behaviour of gray cast iron in this environment, this pape...