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Advanced ceramic components: Materials, fabrication, and applications
Tunmise Ayode Otitoju,Patrick Ugochukwu Okoye,Guanting Chen,Yang Li,Martin Onyeka Okoye,San-xi Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
The global demand for ceramic materials with wide-ranging applications in the environment, precisiontools, biomedical, and electronics, and environmentalfields is on the increase. Several ceramic materialsand methods of fabrication have been developed with task-specific properties. The material, thefabrication methods, and processing conditions impel characteristics including corrosion-resistant,outstanding optical and electrical properties, hardness and anti-aging. In this review, various materialsfor the preparation of ceramics and ceramic composites components were investigated to demonstratethe contribution of the materials and different fabrication methods to the properties of the ceramicscomponents. The material properties, sintering temperature, casting technique, and pressure influencesthe ceramics grain size and porosity, which have an explicit effect on mechanical strength, corrosionresistant,and optical properties of the ceramic components. Thefinishing of the ceramic componentsinto a machinable shape requires careful attention to avoid defects. However, most conventionalfinishing methods are cost-intensive, hence, the need to commercialize 3-D printing for large scale andlong-run applications. It is hoped that this review would propagate wider research on low cost andenergy effective pathways to produce ceramics with dynamic properties, which can be applied in severalfields with outstanding performance.
Tunmise Ayode Otitoju,Dafu Jiang,Yuanyuan Ouyang,Mohammed Ahmedelbadawi Mohammed Elamin,San-xi Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
In this study, CaCu3Ti4O12 (CCTO) modified polyethersulfone (PES) HF membranes were prepared via drywetphase inversion by adding different concentration of CCTO particles (0–4 wt.%) in the dope solution. The synthesized PES/CCTO composites were characterized by viscosity measurement, scanning electronmicroscope, X-ray diffraction, contact angle, pore size, and pore size distribution. Theflux and thephotocatalytic activity of CCTO entrapped PES membranes were subsequently evaluated by crossflowultrafiltration and the photodegradation of Rhodamine B (RhB) under UV irradiation, respectively. Thepure water permeability of the composite membranes improved considerably upon the addition of CCTOowing to its slightly improved hydrophilicity and moderate pore size. The results also show that the PES/CCTO composite exhibited a higher photocatalytic activity, which was mainly attributed due to thecrystallite size of CCTO particles.
Tunmise Ayode Otitoju,ABDUL LATIF AHMAD,Boon Seng Ooi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.10
The relationships among varying bore fluid compositions containing ethanol/water were studied. The ethanol composition was varied in the ratio of 0%, 25%, 50%, 75% and 100%. The membrane dope solutions were prepared from 17.25 wt% polyethersulfone (PES), 0.75 wt% polyethylene glycol (PEG), 3 wt% silicon dioxide sol and 78.25 wt% of 1-methyl-2-pyrrolidone (NMP) via dry-jet spinning process. The membranes’ morphology as a result of varying ethanol ratio in the bore fluid composition was characterized and their effects on crude oil/water emulsion separation were evaluated. Results show that the membrane pore size and porosity decreased with increasing ethanol content in the bore fluid mixture, whereas the inner wall thickness of fibers increased. Furthermore, an increase in ethanol concentration also resulted in a slight increase in water contact angle. The use of 100/0 of ethanol/water resulted in UF membranes with the lowest performance. On the other hand, bore fluid mixture containing 25/75 ethanol/water produced membrane with the best performance for crude oil/water separation. Overall, the use of bore fluid mixture containing 25/75 ethanol/water mixture was found to be a powerful way to tune the morphological properties and performance of HF membrane.
Yaxiong Tian,Jianghua Zhang,Tunmise Ayode Otitoju,Honggang Wang,Huaxia Chen,Lin Zhu,Zhongmin Feng,Ting Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
The performance of V2O3 is threatened as a result of relatively sluggish electrons/ion transportation andstructural pulverization in lithium-ion batteries. The rational design of the electrode structure to exhibitgreat lithium storage of V2O3 is crucial. In this work, we report stable composite electrodes by integratingV2O3 nanoparticles with an uneven carbon-coated stainless-steel oxide (V2O3/C/SS) current collector viaan in-situ growth method. They allow fast electrical conductivity through the carbon coating and reductionstrategy. Meanwhile, the small nanoparticle size of V2O3 on V2O3/C/SS as well as the undestroyed 3DV–V skeleton are helpful to Li-ion diffusion. The weak interaction between Li ions and V2O3 achieves fastand high Li storage behavior, which proves by electrochemical kinetics analysis and DFT calculation. Theelectrode delivers high rate capacitive and long cycling stability with 564 mAh g1 and 310 mAh g1 at100 mA g1 and 1 A g1, respectively, and a specific capacity of 118 mAh g1 is achieved after 1000 cyclesat 5 A g1. The excellent electrochemical performance may be ascribed to the unique design for effectiveelectron and Li-ion transportation. This work offers a new prospect for the development of highperformancebinder-free V2O3-based electrodes.
Li Yang,Li Sanxi,Wang Song,Tian Chengcheng,Otitoju Tunmise Ayode 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.2
The effect of addition of ethylene glycol (C2H6O2) on the synthesis of crystalline boron carbide (B4C) powder from a condensedboric acid (H3BO3)-glycerin (C3H8O3) product was investigated. Equal molar amount of H3BO3 and glycerin was mixed andsubjected to dehydration-condensation reaction using various amount of ethylene glycol (0 to 40 mol% based on glycerolamount). Then the condensed product was thermally decomposed in air twice to obtain surface carbon-free precursor powder. The crystalline phases and surface functional groups of the material was characterized using XRD, SEM, FTIR and TGA. Addition of ethylene glycol offered a new organic sites and comparatively, reduced pyrolysis temperature from 700 to 650 oC. The complete formation of crystalline B4C powder was achieved at 1475 oC within 2.5 h, which is among the shortest timereported for B4C synthesis