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Jun 2023 DOI 10.14302/issn.2377-2549.jndc-23-4431
Ifeanyi John ObibuenyiCorresponding author
Background of this paper investigates dogonyaro-leaf-extract as inhibitor for aluminum corrosion in 0.3-M hydrochloric acid, and its acceptability as original. In the methods, the extract was analyzed for phytochemicals and corrosion test performed on aluminum sheet before immersion in acid incorporated extract. Electrochemical Impedance Spectroscopy (EIS), tests were performed over frequency of 100 KHz–10 mHz and 10 mV peak to peak perturbation amplitude to obtain the corrosion potential. Tests were run at 30oC ± room temperature in aerated quiescent solutions. In weight loss method, coupons were suspended in aerated solutions before immersion in 20% mixture of sodium hydroxide and zinc dust to stop further corrosion. Morphology of the mirrorlike finished arid surface aluminum was measured with scanning electron microscope SEM. In the results, various phytochemicals were observed; significant effect of incorporating inhibitor on EIS data recorded and optimum extract efficiency was 99.46%, at 10 g/l, 60oC, within 6 hours. This result was validated and 99.3% efficiency obtained. Introduction of extract into acid corrodents caused increase of charge transfer resistance and reduced double layer capacitance. A warm arid clean coupon evolved after SEM test. In conclusion, there was increase in efficiency of inhibition as inhibitor concentration and temperature increased. Similarly, close responses towards the factors for Inhibition occur. Measured polarization showed that extract inhibited both cathodic and anodic reaction processes and thus, is classified as mixed type inhibitor. The investigations thus proved the extract as excellent corrosion inhibitor for aluminum in 0.3-M hydrochloric-acid.
Jun 2022 DOI 10.14302/issn.2641-5518.jcci-22-4171
Dosoky Elayouty HamdyCorresponding author
Prof. of CT Surgery at Suez Canal University and Abo-Khalifa Emergency Hospitals; Ismailia; Egypt
Purpose Is it safe to excise only the external portion of the pacemaker wires? This presentation aims to find out the proper way to manage pacing wires postoperatively. Methods We report 5-cases of sub-xiphoid abscesses and sinuses after valve surgery. Each case presented with a recurrent abscess that opens and drains its contents through a sinus around the lower-most portion of the xiphoid process. The duration between open heart surgery and evolution of these abscesses varied between 18 and 60 months. Valve surgeries were mitral and/or aortic valve replacement. Surgeons usually insert pacemaker wires to control any persistent post-operative arrhythmias that can affect hemodynamic circulation. On the day of discharge, some surgeons (not in our center) usually excise the pacemaker wires. Results The remaining intra-thoracic portions underwent some degree of corrosion that caused a state of chronic inflammation, sinus track formation and abscess evolution. This indicated radiological examination and surgical exploration to extract these foreign bodies. These 5 cases were diagnosed and operated upon between 15th January 2022 and 1st March2022, all at Abo-Khalifa Emergency Hospital-Ismailia, Egypt. Conclusions This confirms the significance of total withdrawal of the external pacemaker wires. Surgeons should not apply tight sutures at the site of insertion of the wires.
Jul 2018 DOI 10.14302/issn.2831-8846.j3dpa-18-2207
Dehghanghadikolaei AmirCorresponding author
Oregon State University, USA
Additive manufacturing (AM) is reshaping fabrication in engineering and clinical settings. This editorial highlights metal AM routes—SLS, SLM, DMLS, and EBM—and their application to patient-specific NiTi implants, where biocompatibility and shape-memory behavior are compelling. We note the current gaps that matter in practice: process parameter tuning, post-processing (heat treatment, coating, machining/finishing), and their effects on mechanical performance and corrosion. We invite contributions that quantify these trade-offs and expand AM beyond metals into polymers and ceramics, with clear comparisons across processes and materials. Our goal is to surface actionable findings that improve part quality, reliability, and clinical/industrial readiness.
Jul 2014 DOI 10.14302/issn.2377-2549.jndc-12-172
Noubactep ChicgouaCorresponding author
Angewandte Geologie, Universität Göttingen, Goldschmidtstraße 3, D - 37077 Göttingen, Germany.
Despite two decades of intensive research on using metallic iron (Fe0) for environmental remediation and water treatment, basic concerns about their efficiency still prevail. This communication presents the basic idea of the view that challenges the prevailing paradigm on the operating mode of Fe0/H2O systems. The alternative paradigm is in tune with the mainstream science on aqueous iron corrosion. Its large scale adoption will enable a scientifically based system design and increase the acceptance of this already proven efficient technology.