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Spark Plasma Sintering of Graphene-Reinforced Inconel 738LC Alloy: Wear and Corrosion Performance
Olugbenga Ogunbiyi,Tamba Jamiru,Rotimi Sadiku,Oluwagbenga Adesina,Olanrewaju Seun Adesina,Babatunde Abiodun Obadele 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
This study aims to investigate the microstructure, corrosion and tribological properties of spark plasma sintered graphenenanoplatelets (GNPs) reinforced Inconel 738 low carbon composites. The matrix and reinforcement were thoroughly milledin order to ensure homogeneity. Thereafter, the milled powders were consolidated by using spark plasma sintering. Themicrostructural evolution and the phases formed were examined by the using scanning electron microscopy and X-ray diffractometrytechniques. The corrosion analysis was investigated in acidic and basic media, while the tribological test wasconducted under dry sliding conditions at varying loads. The results show that the microhardness values were significantlyinfluenced by varying the GNPs constituents in Inconel 738LC from 384 to 459 HV0.5,while the sintered density was influencedby the sintering parameters. The corrosion response of the sintered composites in both acidic and basic media arecomparable, irrespective of the varying GNPs content in the matrix. The wear performance suggests that the addition ofGNPs to IN738LC, greatly enhanced the wear resistance and reduced the friction coefficient of the sintered IN738LC-GNPscomposites. The improvement is attributed to the influence of the graphene-based tribofilm that formed on the sliding contactinterface, which reduced friction coefficient. Likewise, graphene has a slight potential of forming continuous tribofilms atthe friction interface due to its lubricity. It is thought that the GNPs reinforcement reduced the pull-out tendency, duringwear activities.
O. A. Akinloye,L. A. Sulaimon,O. E. Ogunbiyi,A. E. Odubiyi,A. A. Adewale,M. A. Toriola,O. A. Salami,I. D. Boyenle 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.4
This study evaluated the ameliorative effect of Amaranthus spinosus leaf methanol extract (ASLME) against doxorubicininduced multi-organ damage in Sprague Dawley Rats. Forty-nine (49) male Sprague Dawley rats were randomly stratified into 7 groups with 7 rats per group. Groups A and B received distilled water for 7 days. Groups C, D, and E were pretreated for 7 days with 200 mg/kg silymarin, 500 and 1000 mg/kg ASLME, respectively followed by intraperitoneal injection of 20 mg/kg doxorubicin (DOX) to groups B, C, D, and E on the 8th day. Groups F and G were orally administered 500 and 1000 mg/kg ASLME respectively for 7 days with an intraperitoneal injection of distilled water on the 8th day. After 48 h of DOX administration, blood was withdrawn by cardiac puncture, and organs were excised for biochemical and histopathological assays. Pretreatment with ASLME decreased the levels of tissues malondialdehyde and nitric oxide as well as serum tumor necrosis factor alpha (TNF-α) with a concomitant (p < 0.05) increase in the levels of serum interleukin-10 (IL-10) and tissues reduced glutathione in a dose-dependent manner compared to group B. The activities of antioxidant enzymes increased significantly (p < 0.05) in the ASLME pretreated groups as well as groups F and G when compared to group B. Administration of doxorubicin induced degenerative hepatic, nephrotic and cardiac biomarkers and histological changes in Group B, while remarkable reversal of these pathological features was observed in groups pretreated with ASLME. Our findings suggest the chemo-protective effect of ASLME against doxorubicin-induced multi-organ damage, by alleviating oxidative stress and inflammation in rats.
Kazeem A. Akinwumi,Olabode O. Osifeso,Afusat J. Jubril,Ayobami W. Adedoja,Elizabeth T. Ogunbiyi,Fumilayo M. Adebo,Idayat O. Adesina,Oyeronke A. Odunola 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.5
Exposure to hexavalent chromate compounds such as other human carcinogens is unavoidable in the developing countries of the world. Research efforts are being directed toward minimizing exposure to them, intercepting their activity in vivo, and/or prophylaxis. The present study therefore evaluates the effect of methanol extract of the leafy vegetable, Corchorus olitorius (MECO), against potassium dichromate (K2Cr2O7)-induced toxicities. Negative control animals were fed distilled water, while the positive control rats received 12 mg/kg body weight K2Cr2O7 once a week for 6 weeks. Test rats were exposed daily to 25, 50, and 100 mg/kg body weight MECO alone for 6 weeks and 12 mg/kg body weight of K2Cr2O7 once a week for 6 weeks before sacrifice. The frequency of micronucleated polychromatic erythrocytes (mPCEs) was monitored in bone marrow cells, while induction of aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine levels, and hematological parameters were assessed in the plasma. The phytochemical analysis of MECO was also carried out. K2Cr2O7 significantly (P < .05) increased the levels of mPCEs, AST, ALT, creatinine, total white blood cells, and lymphocytes compared with the control. The percentage pack cell volume and neutrophils were, however, reduced. In contrast, MECO at different doses restored the markers toward the levels of the negative control. MECO is rich in flavonoids, saponins, anthraquinones, terpenoids, and phenols, and they might be responsible for the protective effect observed in this study. Our results suggest that MECO has a promising potential in the treatment/management of chromate-induced toxicities.