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Articles by S. Oyetola
Total Records ( 2 ) for S. Oyetola
  V. Coulibaly , J. Sei , S. Oyetola , Moulay T. Sougrati and J.C. Jumas
  Iron is present in clay minerals under various forms and influences their properties by virtue of changes in its redox state in their crystal structure. The purpose of this work was to determine the iron statutes in the clays consummated in Côte d’Ivoire for their therapeutic virtues. We used 57Fe Transmission Mössbauer Spectroscopy which is a powerful method to characterize local environment of Fe in iron-bearing minerals. In the green clay of Anyama (AVA) dominated by chlorite, illite and quartz with minor amounts of other minerals including smectite, Mössbauer spectra showed that at least 60% of the total iron was present as Fe2+ in two different octahedral sites characterized by δ = 1.09-1.13 mm sec-1 and ΔEq = 2.34-2.65 mm sec-1. For Fe3+ cation, the fit revealed two distorted octahedral (δ = 0.28-0.43 mm sec-1 and ΔEq = 0.78-1.1 mm sec-1) and one tetrahedral (δ = 0.15 mm sec-1 and ΔEq = 0.16 mm sec-1) sites. The clays from Bingerville (LBF, LVF and LJFF) were dominated by kaolinite with relative important amounts of quartz, illite and goethite. Their room temperature Mössbauer spectra were characterized by a broad doublet indicating that iron was present as Fe3+ in octahedral site (δ = 0.37-0.4 mm sec-1 and ΔEq = 0.45-0.58 mm sec -1). Samples LBF and LVF contained small amounts of Fe2+ while an intermediate valence was observed in sample LVF. Sample LJFF was rich in goethite presenting a superparamagnetic behaviour at room temperature but order magnetically at liquid nitrogen temperature.
  E.B. Kpangni , Y.Y.J. Andji , K. Adouby , S. Oyetola , G. Kra and J. Yvon
  This study deals with two clays referenced K1 and K2, used in the local and traditional manufacture of pottery ware at Katiola. Those samples were analysed by X-rays diffraction, infrared spectroscopy and thermal differential and chemical techniques. The results show that the samples (K1 and K2) are mainly composed of montmorillonite, kaolinite and illite. Only K1 is inter-stratified. The mineralogical balance achieved from the reflection (001) of the oriented film, indicate for K1: 74.5% of montmorillonite; 13.5% of inter-stratified clay; 7% of kaolinite and 5.4% of illite and for K2: 73.4% of montmorillonite; 23.5% of kaolinite and 3.1% of illite. The results also indicate that the raw material may not be use only for pottery. It can be consider in the protection of the environment, cosmetic industry, vegetable oil treatment, medicine etc.
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