Taleatu B.A.,Obafemi Awolowo University |
Taleatu B.A.,Elettra - Sincrotrone Trieste |
Fasasi A.Y.,Center for Energy Research and Development |
Di Santo G.,Elettra - Sincrotrone Trieste |
And 9 more authors.
AIP Advances | Year: 2011
One of the most viable ways to grow nanostructures is electro deposition. However, most electrodeposited samples are obtained by three-electrode electrochemical cell. We successfully use a much simpler two-electrode cell to grow different ZnO nanostructures from common chemical reagents. Concentration, pH of the electrolytes and growth parameters like potentials at the electrodes, are tailored to allow fast growth without complexity. Morphology and surface roughness are investigated by Scanning Electron and Air Force Microscopy (SEM and AFM) respectively, crystal structure by X-Ray Diffraction measurements (XRD) and ZnO stoichiometry by core level photoemission spectroscopy (XPS). © 2011 Author(s).
Taleatu B.A.,Obafemi Awolowo University |
Taleatu B.A.,International Center for Theoretical Physics |
Omotoso E.,Obafemi Awolowo University |
Lal C.,International Center for Theoretical Physics |
And 6 more authors.
Surface and Interface Analysis | Year: 2014
Growth conditions, structural, and optical properties of MgO nanostructure have been investigated. Surface composition and shift in binding energy of Mg at 50.8 eV due to oxidation were examined by core-level spectroscopy. The SEM showed that the film is dense, and grain growth and crystallinity are enhanced by post-deposition annealing. Grain distribution was appraised within the confinement of 24.51 μm2 from the selected scan areas. X-ray diffraction studies indicated prominent peaks, which are attributed to (111), (200), and (220) reflections from fairly crystallized and randomly oriented MgO thin film. Plane (111) is found to be the preferred orientation of the film. The film transmitted well across the visible spectrum and the estimated energy band gap is 5.41 eV. Absence of catalyst in the electrolyte solution aided the purity of the sample. Copyright © 2014 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd.
Ogundari I.O.,National Center for Technology Management |
Momodu A.S.,Center for Energy Research and Development |
Famurewa A.J.,National Center for Technology Management |
Akarakiri J.B.,African Institute for Science Policy and Innovation |
Siyanbola W.O.,National Center for Technology Management
Energy and Environment | Year: 2012
Nigeria's biofuels policy advocates the adoption of cassava as feedstock for a 10%-biofuel substitution option in Nigerian transport fuel demand. This policy option is expected to address energy security and environmental consequences of using fossil fuels as the sole source of transport energy in the country. This paper appraised the technological and economic factors necessary for achieving Nigeria's cassava-based biofuel initiative at different substitution levels of 5, 10, and 15% by the Year 2020. A multi-stage energy forecasting and project analysis framework adapted from Coate's structure for technology assessment, as well as engineering economy methodology was used for the study. Technological analysis entailed determining petrol consumption projection, R and D capability, input feedstock requirements, environmental considerations and land requirement for feedstock crop production while engineering economy analysis evaluated the economic viability of the project. The results showed that petrol consumption in Nigeria and bioethanol substitution requirements were in the range of 18,285.7-19,142.84 thousand tons and 914.28 (5% low demand)-2871.43 (15% high demand) thousand tons, respectively by 2020.Cassava feedstock and landmass requirements for bioethanol production were in the range of 4.64-14.53 million tons and 4.08-12.80 thousand sq. km, respectively while carbon dioxide savings were between 1.87-5.89 million tons by 2020. The recovery price for cassava bioethanol was estimated to be US$ 0.74/litre (N 111/litre). Petrol being subsidised presently is harmful to the environment though it 'oils' the economy. Nigeria currently subsidizes petroleum products to the tune of 28% of 2011 budget. The government plans to remove this by 2012. Thus we conclude that weighing both economic and environmental benefits of bioethanol substitution in petrol consumption in Nigeria, the study showed that bioethanol production from cassava feedstock would be both technically and economically viable, provided subsidy, which depends on political will on the side of the government, is introduced for the first ten years of its implementation.
Ekere N.R.,University of Nigeria |
Eze I.S.,Center for Energy Research and Development
Human and Ecological Risk Assessment | Year: 2014
The cyanogenic potentials and residual cyanide contents of local cassava parenchyma and their locally processed food products in southeastern Nigeria were studied. Seven species of cassava locally grown and four main food products from them were analyzed colorimetrically for their cyanide contents. Results of the analyses indicated that five of the species contain cyanide potentials between 50 and 100 mg HCN/kg fresh weight while only one contains cyanogens level greater than 100 mg HCN/kg fresh weight. Of the cassava products analyzed, two contained cyanide above the level recommended by the WHO/FAO (10 mg HCN/kg). The result raises concern as these cassava products constitute about 80-90% of the diet of the local people and the facts known about cyanide poisoning from intake of high cyanide containing food. © 2014 Copyright Taylor and Francis Group, LLC.