Article
Soil Science
Tetsuhiro Watanabe, Shiori Ueda, Atsushi Nakao, Antoine Mvondo Ze, Randy A. Dahlgren, Shinya Funakawa
Summary: This study investigated the pedogenic factors influencing the concentrations of active Al, Fe, and Si along the Cameroon volcanic line. Climate factors, including temperature/dry season intensity, weathering degree, and precipitation/leaching, were found to be the primary determinants. High elevation and drier climate favored the formation of organo-metal complexes, while weathering degree played a critical role in the formation of short-range-order minerals. The results highlight the discriminatory effects of climatic factors and weathering degree on the composition of active Al, Fe, and Si fractions in the study area.
Article
Chemistry, Physical
Pedro Jose Sanchez-Soto, Dolores Eliche-Quesada, Sergio Martinez-Martinez, Luis Perez-Villarejo, Eduardo Garzon
Summary: This study analyzed a deposit of raw kaolin in West Andalusia, Spain. The results showed that wet separation can improve the kaolinite content of the raw kaolin and the fired samples exhibited good ceramic properties. Furthermore, the study found that adding alumina can increase the amount of mullite, thus allowing the preparation of high-alumina refractories using this kaolin.
Article
Construction & Building Technology
G. Kieufack, N. Fagel, A. B. Tchamba, I. Y. Bomeni, F. Ngapgue, M. El Ouahabi, A. S. L. Wouatong
Summary: This study analyzes and evaluates the alluvial clays of Bamendou-Balessing in West Cameroon, revealing that the clays are mainly composed of kaolinite, with varying amounts of illite and vermiculite. The non-clay mineral phases include quartz, K-feldspar, gibbsite, and goethite. The firing properties of the clay samples were also determined, with samples G and YG showing the most suitable physico-mechanical properties for fired bricks.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Liu Guo, Xiaoyu Wang, Ye Li, Yuandong Mu, Quanli Jia, Gang Wang, Liugang Chen
Summary: Introducing micro-sized basic zinc carbonate into high alumina castables improved their properties after firing at high temperatures, with enhanced strength and hot modulus of rupture. The addition of BZC resulted in improved volume stability and mechanical properties compared to castables with Zn(OH)2.
CERAMICS INTERNATIONAL
(2021)
Article
Construction & Building Technology
Hamed Bayesteh, Hamidullah Hezareh
Summary: The effects of high salinity grout on the mechanical and physical behavior of cement-stabilized marine clay were investigated in this study. The use of saline water did not decrease the strength of mixtures containing kaolinite or marine clay, but had a negative effect on the strength of mixtures containing active bentonite. It is recommended to limit the cement content to less than 15% when using saline water in clayey soil with active minerals.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Xiaoyang Wang, Guihua Liu, Tiangui Qi, Wenqiang Huang, Xiaobin Li, Qiusheng Zhou, Zhihong Peng
Summary: Increasing the density of ?-Al2O3 powder can improve the performance of alumina-bearing materials, and factors such as precursor, seeds, and additives also impact the density. Additionally, high AlO6 content in ?-Al2O3 prepared from gibbsite leads to linear density increase, while the structural features and transformation process influence the density and specific surface area of ?-Al2O3 derived from boehmite.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Larissa C. G. Botelho, Gustavo C. Xavier, Ana Luiza C. Paes, Afonso R. G. Azevedo
Summary: This study aims to evaluate the effects of replacing lime with finely ground kaolinitic clay (GC) in coating mortars, by analyzing water retention, calorimetry, XRD, mechanical resistance, water absorption, and void index, and comparing them to a reference mortar (RM) with lime and a mortar with commercial clay (CC). The justification for this work is that clay is commonly added to mortars as a substitute for lime, but these replacements alter the properties of mortars and require experimental evidence for evaluation. The tests showed an increase in water consumption in mortars with CC and GC, but the water retention properties were not affected. XRD patterns indicated that the addition of GC in mortars consumed portlandite and likely underwent a pozzolanic reaction to form new C-S-H compounds. These results demonstrate that kaolinitic clay can be added to 1:1:6 mortars while maintaining their key properties for use as coatings.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Environmental
C. M. Aswathy, B. M. Sunil
Summary: This study evaluated the effect of inorganic contaminants on the behavior of bentonite-based landfill liner material at different blending ratios. Results showed a decrease in hydraulic conductivity, a slight reduction in unconfined compressive strength under wet conditions, and good adsorption characteristics of the blended lithomargic clay with bentonite.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Ceramics
Ren-jun Li, Ling Zhang
Summary: This study investigates the effect of adding the amount and particle size of MgAl2O4 on the high-temperature creep resistance of Al2O3-MgAl2O4 refractory materials and its mechanism. The results show that the formation of a secondary spinel layer by the reaction between spinel particles and alumina matrix improves the creep resistance of the specimens. The migration rate of Mg2+ and the size of the spinel have a significant impact on the thickness of the secondary spinel layer at the reaction interface.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Panwu Li, Ming Zhang, Wei Yao, Zeping Xu, Rong Fan
Summary: An effective method using water containing positively charged nanobubbles and polyaluminum chloride was proposed to treat high-ash fine coal. The results showed that this method could enhance combustible recovery and reduce ash recovery compared to using normal nanobubble water. The presence of positively charged nanobubbles intensified the aggregation of fine coal particles, while polyaluminum chloride disrupted the coal flocs induced by nanobubbles, leading to the release of trapped kaolinite particles and alleviated clay recovery by entrapment.
Article
Metallurgy & Metallurgical Engineering
Ravi Kant Sagar, Rameshwar Sah, Basavaraja Maribasappanavar, Sangamesh Desai, G. Balachandran
Summary: This research successfully utilizes hematite ore containing goethite, kaolinite and gibbsite to produce pellets without deteriorating their properties by optimizing the drying and preheating stages. The findings have been applied to an existing pellet plant, resulting in a reduction in pellet fines generation.
MINING METALLURGY & EXPLORATION
(2022)
Article
Geochemistry & Geophysics
Arthur Stefanelli Gasparini, Mauricio Paulo Ferreira Fontes, Anderson Almeida Pacheco, Joao Carlos Ker
Summary: This study investigated the variation in morphology and crystallinity of naturally occurring gibbsites from soils and bauxites. The results showed that gibbsites from Amazon soils and bauxites have better crystallinity with larger crystals and a laminar morphology compared to the other soil samples.
Article
Chemistry, Physical
Anna S. Semenkova, Anna Yu. Romanchuk, Irina F. Seregina, Ivan Mikheev, Valentina S. Svitelman, Stepan N. Kalmykov
Summary: The present study investigated the sorption behavior of Eu(III) on kaolinite, focusing on two kaolinite samples with different origins and compositions. A high-purity natural sample of kaolinite was used to examine the dependence of sorption on ionic strength, pH, and radionuclide concentrations, and compared with another kaolinite sample containing admixtures of other clay minerals. The study also observed the effect of cations leaching from clay on the sorption. Based on experimental results, a thermodynamic sorption model of Eu(III) sorption onto kaolinite was developed, taking into account ion-exchange, surface complexation reaction, and competition with Al3+ sorption. The model was successfully tested on literature data for other kaolinite samples.
APPLIED CLAY SCIENCE
(2023)
Article
Soil Science
Han Lyu, Tetsuhiro Watanabe, Yoriko Ota, Arief Hartono, Markus Anda, Randy A. Dahlgren, Shinya Funakawa
Summary: This study investigates the distribution of soil secondary minerals in volcanic regions of Java and Sumatra islands, and finds that climate, seasonal desiccation, and parent material play significant roles in regulating secondary mineral distributions.
Article
Construction & Building Technology
Sen Wang, Lloyd Gainey, Ian D. R. Mackinnon, Yunfei Xi
Summary: This study investigates the effects of kaolinite defects on the properties of fired brick buttons. The results show that brick products prepared with high-defect kaolinite have lower water absorption and higher bulk density at higher firing temperatures. There is no significant difference in color, XRD phase composition, or compressive strength of brick buttons with different kaolinites fired at 850, 1050, and 1150 degrees C. However, high-defect kaolinite particles lead to lower porosity, finer particles, and higher compressive strength at 950 degrees C.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Bukola Joseph Babalola, Ojo Jeremiah Akinribide, Olukayode Samuel Akinwamide, Peter Apata Olubambi
Summary: The study investigated the mechanical and tribological characteristics of Ni-17Cr-10X ternary alloy systems developed via spark plasma sintering. The Ni-17Cr10Mo alloy exhibited the highest indentation hardness value, elastic modulus value, and wear resistance, while Ni-17Cr10W possessed the least mechanical and wear properties. The SPS technique was shown to be efficient in developing nickel-based alloys without defects such as segregation of alloying elements, as evidenced by scanning electron microscopy micrographs.
WORLD JOURNAL OF ENGINEERING
(2023)
Article
Materials Science, Ceramics
Mary A. Awotunde, Peter A. Olubambi, Daolun Chen
Summary: In this study, carbon nanotube (CNT)-reinforced NiAl intermetallic composites were produced via powder metallurgy. The compressive behavior of the sintered NiAl-CNT composites at room temperature was evaluated, with a focus on the toughening mechanisms of the CNT reinforcement and the resulting microstructures. The results showed that the NiAl-0.5 wt% CNT composites exhibited a balanced combination of strength and toughness due to the presence of both coarse and fine bimodal grains in its microstructure.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Samuel Olukayode Akinwamide, Andrew Venter, Ojo Jeremiah Akinribide, Bukola Joseph Babalola, Anthony Andrews, Peter Apata Olubambi
Summary: This study investigates the effect of residual stress on the corrosion behavior of 2205 duplex stainless steel in a chloride environment, and demonstrates its excellent corrosion resistance and potential to replace conventional alloys.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Multidisciplinary Sciences
Rokhsareh Akbarzadeh, Olusola Olaitan Ayeleru, Qusai Ibrahim, Peter Apata Olubambi, Patrick Ndungu
Summary: This study utilized DFT calculations and Material Studio simulation software to investigate the changes in electronic properties of recycled expanded polystyrene (rEPS) after modification with ZnS and ZnO nanoparticles, and to predict the potential photocatalytic properties of the new nanocomposites. XRD analysis provided crystallography data, and it was found that these nanocomposites obtained from waste materials may have potential in photocatalytic applications based on the electronic structure and band gap narrowing.
Review
Materials Science, Multidisciplinary
Mary A. Awotunde, Adewale O. Adegbenjo, Olusegun O. Ajide, Peter A. Olubambi
Summary: The applications of carbon allotrope-reinforced Ti-based composites have expanded significantly, but there is still controversy regarding the process of in-situ TiC formation, its position within the composite, and its impact on the properties. This study aims to review previous research to broaden the understanding of this important area of interest.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Anthony Andrews, Edward F. Nyarko, Albert A. Adjaottor, Elsie Nsiah-Baafi, Mark Adom-Asamoah
Summary: The use of sulphide mine tailings as a substitute for sand in construction mortar can reduce tailings management costs and promote sustainable construction. The study found that cement is the most suitable binder for stabilizing the tailings, followed by cement-pozzolana and cement-lime which showed lesser effectiveness.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Oluwasegun Eso Falodun, Samuel Ranti Oke, Samuel Olukayode Akinwamide, Olawale Olarewaju Ajibola, Abdullahi Olawale Adebayo, Sunday Gbenga Borisade, Adeolu Adesoji Adediran, Peter Apata Olubambi
Summary: This study investigates the influence of ceramic (TiN and TiB2) particles on the densification, microstructure, wear, and nanoindentation behavior of titanium matrix composites produced by spark plasma sintering. The results show that the addition of TiN and TiB2 reduces the relative density of the composite, but increases the microhardness and wear resistance.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Miltia Lesufi, Samuel Olukayode Akinwamide, Washington Makoana, Lerato Tshabalala, Peter Apata Olubambi
Summary: This study investigates the microstructural, nanomechanical, and corrosion behavior of different sections of 410 steel fabricated via directed energy deposition technique. The results showed minimal pores in the specimens, suggesting improved density in the layer-by-layer built specimens. The top specimen exhibited the lowest corrosion resistance.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Energy & Fuels
Olusola Olaitan Ayeleru, Joshua Adeniyi Adeniran, Sula Bantubakhona Kwesi Ntsaluba, Lanrewaju Ibrahim Fajimi, Peter Apata Olubambi
Summary: One of the major issues faced by many developing countries, including South Africa, is the insufficient generation capacity of electricity, leading to frequent power cuts and high usage costs. This study aims to estimate the cost analysis of electricity usage at the University of Johannesburg residences and propose an energy-efficient model for not only the university but also other South African universities. Through analyzing the tariffs from 2015 to 2021, a five-year forecast using a non-linear autoregressive exogenous neural network (NARX-NN) model was made. The results show that the NARX-NN model studied has a root mean squared error (RMSE) of 2.47 x 10(5) and a determination coefficient (R2) of 0.9661. The projection also indicates that the annual cost of energy consumption will continue to increase, with an estimated peak in 2022 of over ZAR 30 million (USD 2,076,268).
Article
Automation & Control Systems
Samuel Olukayode Akinwamide, Mabontle Maleka, Nthabiseng Motabeni, Ojo Jeremiah Akinribide, Falodun Eso Oluwasegun, Peter Apata Olubambi
Summary: This research focuses on the characterization of microstructure and evaluation of nanomechanical properties of hybrid aluminium-based composites, which were fabricated by reinforcing pure aluminium matrix with zirconia and ferrotitanium particles. The results show that mixing and sintering the admixed powders at high temperature resulted in the formation of new phases, leading to improved mechanical performance of the composites. Nanoindentation test confirmed the homogeneous dispersion of reinforcement particles. The composites reinforced with 5% TiFe and 5% ZrO2 exhibited the most improved mechanical properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Nondumiso Prudence Msweli, Samuel Olukayode Akinwamide, Peter Apata Olubambi, Babatunde Abiodun Obadele
Summary: A study on the biocorrosion response of spark plasma sintered Ti6Al7Nb alloy reinforced with yttria stabilized zirconia (YSZ) in Hank's solution was conducted. The addition of YSZ greatly influenced the microstructural changes and increased the microhardness of the composites. In terms of corrosion resistance, the Ti6Al7Nb + YSZ composites generally showed higher resistance except for Ti6Al7Nb + 1YSZ, which demonstrated a significant drop in corrosion potential and corrosion current density. The combination of mechanical properties and corrosion resistance suggests that the Ti6Al7Nb + YSZ alloy could be a promising material for dental implants in the future.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Oluwasegun Eso Falodun, Samuel Ranti Oke, Olukayode Samuel Akinwamide, Peter Apata Olubambi
Summary: The impacts of Cr-TiB2 addition on densification, hardness, microstructure, phase transformation, and corrosion were investigated. The results showed a uniform dispersion of TiB2 particles in the titanium matrix during the sintering process. The relative density of the sintered titanium-based composites decreased with an increase in TiB2 percentage. The addition of 5-20 wt.% Cr-TiB2 resulted in a microstructural transformation characterized by equiaxed alpha-precipitates embedded within the beta-phase matrix, and ceramic reinforcements increased the corrosion resistance of the alloys.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Ceramics
Smith Salifu, Peter Apata Olubambi
Summary: The quest to replace glass with transparent aluminium ceramics (AlON) in various applications has been ongoing for a long time. Despite the challenges, researchers are focusing on developing cost-effective fabrication methods that will revolutionize the engineering world. This review paper presents the fabrication techniques, challenges, and prospects associated with transparent AlON ceramics to stimulate research interest in this area.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2023)
Article
Engineering, Multidisciplinary
Matthew Adah Onu, Olusola Olaitan Ayeleru, Bilainu Oboirien, Peter Apata Olubambi
Summary: This study investigated the thermal catalytic conversion of waste PP and PE polymers into carbon nanotubes (CNTs). The results showed that the CNTs obtained from PP had a higher graphitic value and more ordered graphite structure compared to those obtained from PE. It was also found that the recycled PP and PE could be used as good alternative carbon sources for CNT production.
ADVANCES IN SCIENCE AND TECHNOLOGY-RESEARCH JOURNAL
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
T. Mojisola, S. O. Seidu, P. A. Olubambi, A. A. Adediran
Summary: The effect of preconditioning and optimizing the quantity of ladle addition on improving the microstructure and mechanical properties of thin wall ductile cast iron (TWDCI) was studied. The results showed that adding 0.1% preconditioner significantly increased the tensile strength, yield strength, and percentage elongation of the ductile cast iron, while reducing carbide formation and improving nodule counts.
MATERIALS TODAY-PROCEEDINGS
(2022)
