Journal of Modern Materials

The Influence of Preparation Parameters on Structural and Optical Properties of N-Type Porous Silicon

Kawther M'hammedi — 2023-03-05

In this paper, we describe the formation of macroporous silicon (MPS) formed anodically polarized on n type Si (100) substrates at a constant current density under front side illumination using two electrolytes, HF/Ethanol and HF/Ethanol/H₂O₂. The effect of adding H₂O₂ in the solution on the resulting pores were investigated by scanning electron microscopy (SEM), infrared spectroscopy (FTIR), contact angle measurements and UV-vis spectrophotometry. The results showed that for the anodization conditions the MPS formed in peroxide based (H₂O₂)/HF/Ethanol solution exhibited structures with larger pore size and different pore morphologies depending on the etching time than those formed in HF/Ethanol. The pore density and the pore size of the MPS samples increased with the etching time. The infrared absorption spectrum (FTIR) carried out on the freshly prepared sample indicates that the MPS contains Si-H_x bonds which decrease with increasing the etching time. Finally, measurements of contact angle indicate that the formed MPS samples are highly hydrophobic.

Experimental Investigation on Behaviour of Folded Plate

P Dhanabal — 2023-03-06

Persistence of research was towards the behaviour of folded plate. In this project, we used GGBS blended ferrocement concrete to cover a folded plate 600 mm x 1800 mm x 150 mm. Ferro cement is a building material that is emerging as an alternative for traditional RCC. According to prior research, folded plates are the most cost-effective and visually acceptable option for longer span roofs. First, we built the folded plate model in ANSYS and investigated its behaviour in terms of load versus deflection. Later, for experimental purposes, we cast a folded plate coated with GGBS mixed ferrocement concrete. The results of the experimental inquiry demonstrate that there was an improvement in flexural behaviour when compared to the traditional model. The same was verified using ANSYS findings. ANSYS analysis aids in comparing and summarising experimental data. Both the analytical and experimental inquiry results show that ferro cement structures are a good alternative to RCC since they are less costly and lighter. Because folded plates retain their effectiveness for a longer length of time when Ferro cement is utilised. Ferro cement has made the components smaller to support the load because ferro cement parts are high in stress when reinforcement is spread.

Physicochemical and Performance Assessment of Clay Based Refractory Bricks for Incinerator Application

Ezekiel Iliya — 2023-03-06

Refractories bricks’ excellent thermomechanical and chemical resistant features makes it invaluable materials in modular incinerator ˃ 1000 °C applications. In this research, suitable physicochemical and performance evaluation were employed using X-Ray Fluorescence (XRF), dimensional property assessment, linear shrinkage and water absorption analysis. The samples were sourced from Auchi (ARB1), Afowa (ARB2), Ayogwiri (ARB3), Aviele (ARB4) and Agbede (ARB5) clay minerals deposit in Edo North, Edo State, Nigeria. Then green compact samples were fired into dense phase. The result from the XRF study revealed a generally established composition of ARB1 clay mineral of SiO₂: 44.34%, Al₂O₃: 36.36% and others. ARB2 clay mineral of SiO₂: 41.78%, Al₂O₃: 39.62% and others. ARB3 clay mineral of SiO₂: 45.04%, Al₂O₃: 34.01% and others. ARB4 clay mineral of SiO₂: 40.12%, Al₂O₃: 38.96% and others. ARB5 clay mineral of SiO₂: 47.03%, Al₂O₃: 34.52% and others. The elemental composition of ARB1-5 revealed a similar trend of alumina and silica content to high-Al₂O₃ bricks (SiO₂: 45.0 – 56.0%, Al₂O₃: 39.0 – 48.0% and others) and commercial clay bricks (SiO₂: 48.0%, Al₂O₃: 36.96% and others) respectively. An average lower percentage error ERL, ERW, and ERH of ARB1 samples 0.148, 0.248 and 0.28% were recorded respectively. The average linear shrinkage and water absorption analysis of 9.91 and 4.71% demonstrated a potential for high elasticity of modulus. The overall data from this research shows that ARB1-5 bricks can find use in incinerator and high temperature applications.

Impact Performance Improvement of Multiscale Hybrid Fiber Reinforced Polymer Composites with CNT

Erdem Ferik — 2023-12-31

Improving the interface properties of carbon nanotubes increases the mechanical performance of fiber-reinforced polymer matrix composites. Studies on different fiber types and different polymer matrix materials present promising results in literature. The effect of carbon nanotube (CNT) additives on impact performance of fiber reinforced polymer matrix composites produced by vacuum infusion method and drop weight impact test applied. Glass and carbon 1 m² fiber fabrics were divided into 9 equal square pieces and placed on top of each other to make them multi-layered structure. Fiber reinforcements were produced using vacuum infusion method with epoxy resin. 0.5% of the total composite weight was added to CNT with same production parameters and intraply hybrid composite containing glass, carbon and aramid fibers was also produced. Samples were produced from the composite plates and the drop weight impact test was performed with 50 J impact energy in accordance with ASTM D7136 standard. While this increase could be observed in glass fiber and carbon fiber reinforced composites, the impact energy absorption performance in carbon fiber reinforced composite increased more than 100%. CNT increased the impact performance of multi-layer fiber reinforced polymer matrix composites.