Department of Physics.
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Item Development and Evaluation of Efficient Smart Solar Lawn Mower(7th International Conference on Science and Sustainable Development and Workshop, 2024) Onuabuchi, E. M.; Ekeopara, J. U.; Sule, Rasidi; Ayanbisi, O.; Akinwumi, S. A.; Olawole, O. C.; Ogunwale, E.Solar powered lawn mower has offered a more convenient way of trimming the lawn due to the advancement in its technology. As the world gradually moves towards green technology, research has geared towards making solar powered mover readily available, efficient, and economical. However, few reports were available on the effect of grass types on battery voltage drop. In this paper, solar powered lawn mower was structured into phases which include, power supply phase, Arduino phase, motor phase and integration of the components. The 550-motor was sufficient to produce the required torque needed to drive the solar panel mower. The average efficiency of the solar panel was found to be 93 %. The battery voltage drop was investigated upon cutting different types of grasses to determine the rate at which power is dissipated in the solar powered lawn mower. The voltage drop of 0.34 V was recorded when cutting stubborn grass while that of soft grass was found to be 0.17 V. Rain sensor was incorporated to provide the user with a notification via Buzzer whenever raindrops are detected.Item Synthesis of High Purity Mesoporous Silica Derived from Rice Husk for Solar Cell Applications(CSSD 2024, 2025) James, U, E.; Sule, Rasidi; Adegbite, O. A.Engineering materials synthesis has been tailored towards the green synthesis approach as it reduces the emission of harmful substances into the atmosphere. Recently, mesoporous silica has attracted widespread investigation due to its potential as a solar cell semiconductor material. The abundance of silica in rice husk made it a cost-effective and environmentally friendly material. Despite, the abundance of silica in rice husks, obtaining high-purity silica is still challenging. Silica was extracted from rice husk using the sol-gel method without the use of harmful chemicals. As-synthesized silica from rice husk was examined with Fourier transform infrared Spectroscopy. The FTIR result revealed an absorbance peak at 797.7 cm-1 corresponding to the Si-O-Si functional silica group. The XRF result showed that 94 wt% SiO2 was present in the sample. The SEM/EDX result revealed that nanoparticles silica with high purity was produced. The BET surface area of as-synthesized mesoporous silica was found to be 222.83 m2/g. The large surface area obtained suggests that the silica produced has the potential to be used as a solar cell electrode when incorporated with the TiO2. The results obtained in this research suggested that high purity silica could be produced from rice husk without a high heat treatment process.Item Development and Performance Evaluation of Portable water cooling system using thermoelectric peltier modules(ICSSD 2024, 2025) Adeniji, A. P.; Sule, Rasidi; Ogunwale, E. I.; Ayara, W. A.High global temperatures have increased the occurrence of heat waves in most parts of the world, and this has increased the utility cost as more cooling devices are being produced for adaptation. This study deals with the performance evaluation of a portable water-cooling system using thermoelectric peltier modules. The experimental setup involved measuring the temperature reduction of water samples for different volumes (500 ml, 750 ml, and 1000 ml) over 60 minutes at equal interval. The peltier module TEC1-12706 was used with voltage of 12 V. The heat sink was used to enhance the absorbed heat transfer in the system while Arduino Uno serves as the central control unit. Results showed that effective temperature reductions were achieved with cooling capacities (Qc) for different volumes of water. The system coefficient of performance (COP) ranges from 0.12 to 0.13.