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    Wyświetlanie 1-9 z 9
    Tytuł:
    Inhibition and adsorption of oil extract of Balanites aegyptiaca seeds on the corrosion of mild steel in hydrochloric acid environment
    Autorzy:
    Iroha, Nkem B.
    Hamilton-Amachree, Akens
    Powiązania:
    https://bibliotekanauki.pl/articles/1075452.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Balanites aegyptiaca
    Mild steel
    Temkin adsorption isotherm
    corrosion
    inhibition
    Opis:
    The efficiency of oil extract of Balanites aegyptiaca seeds on the inhibition of mild steel corrosion in 1 M HCl has been investigated using gravimetric and electrochemical (Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS)) techniques. Results obtained show that Balanites aegyptiaca (BA) oil extract inhibited the acid corrosion of mild steel. Polarization technique showed that BA oil extract acted as mixed-type inhibitor in 1 M HCl solution. The impedance technique reveals that charge-transfer process controls the corrosion of mild steel. The inhibiting action of BA oil extract was attributed to their adsorption on the mild steel surface and the formation of dense protective layer which increased by increasing their concentration. BA inhibits the corrosion of mild steel by an adsorption mechanism, which follows Temkin adsorption isotherm. Physical adsorption mechanism has been proposed for the inhibitory action of BA oil extract. The protective film formed on the surface was confirmed by scanning electron microscopy (SEM).
    Źródło:
    World Scientific News; 2019, 126; 183-197
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion inhibition potential of Terminalia avicennioides extract on mild steel in 1.0 M HCl: kinetics, thermodynamics and synergestic studies
    Autorzy:
    Ijuo, G. A.
    Surma, N.
    Oloruntoba, S. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177459.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Terminalia avicennioides
    inhibition efficiency
    physisorption
    synergestic effect
    Opis:
    The corrosion inhibition effect of Terminalia avicennioides (TA) stem extract in 1.0 M HCl solution was investigated using weight loss and electrochemical method. The operation variables considered include temperature (303-333 K) and concentration of the inhibitor (0.2 - 1.0 g/L). Inhibition efficiency increased from 21.88% to 88.71% with concentration but decreased with rise in temperature which is suggestive of physisorption. This was supported by the values of activation energies (Ea) obtained ranging from 22.67 KJ mol−1 to 60.67 KJ mol−1 which was lower than 80 KJ mol−1. The values of Gibb’s free energy of adsorption (∆Gads) indicated that the adsorption of the inhibitor on mild steel surface was a spontaneous process. The Kinetic treatment of the data followed a pseudo-first order reaction while the positive values obtained for enthalpy and entropy of activation is reflective of endothermic reaction nature and associative activation complex respectively. The adsorption mechanism followed the Langmuir adsorption isotherm model. Electrochemical analysis showed that the inhibitor functioned as a mixed type inhibitor. The inhibition efficiency of the inhibitor was found to be enhanced by the presence of KI. Therefore the extract functioned as good corrosion inhibitor for mild steel in 1.0 M HCl.
    Źródło:
    World Scientific News; 2018, 102; 1-16
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and adsorption isotherm: application to corrosion inhibition studies of mild steel in 2 M HCl
    Autorzy:
    Abeng, F. E.
    Idim, V. D.
    Obono, O. E.
    Magu, T. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178372.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adsorption isotherm
    inhibition mechanism
    mild steel
    thermodynamic parameters
    Opis:
    Ethanollic extract of Phyllanthus amarus (EEPA) was tested as corrosion inhibitor for mild steel in 2 M HCl solution using gravimetric and gasometric methods at 303, 313, 323 K and 333 K. The results revealed that the corrosion rate increases with temperature and time. Addition of the concentration of ethanollic extract of Phyllanthus amarus to the corroding environment lowered the corrosion rate of mild steel and increased inhibition efficiency (IE %) of ethanollic extract. Inhibition efficiency was found to decreased with temperature. Fitting of the experimental data to the Arrhenius and Transition state equations revealed that the Organic constituents of the extract were physically adsorbed on the corroding surface of the steel and adsorption of ethanollic extract of Phyllanthus amarus (EEPA) on mild steel surface was found to obey the Langmuir adsorption isotherm and Freundlich adsorption isotherm and sign of the Gibb’s fee energy of the adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface. Positive values obtained for enthalpy change indicated that the adsorption of inhibitor is endothermic.
    Źródło:
    World Scientific News; 2017, 77, 2; 298-313
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sansevieria roxburghiana Schult. & Schult. F., Agavaceae: phytochemistry, traditional uses and its pharmacological activities - a review
    Autorzy:
    Obydulla, Obydulla
    Powiązania:
    https://bibliotekanauki.pl/articles/1192841.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Sansevieria roxburghiana
    cardiotonic
    antidiabetic
    Homoisoflavonoid
    Cambodianol
    Corrosion Inhibition
    Opis:
    Sansevieria roxburghiana is a stem less evergreen perennial plant commonly known as “Indian bowstring-hemp”. It has various traditional uses and recently various pharmacological uses are pursuing. Traditionally it is used as a cardiotonic, expectorant, febrifuge, purgative, tonic in glandular enlargement and rheumatism etc. The plant is known to possess antitumor, antibacterial, antidiabetic, antimicrobial, anticancer, antioxidant and analgesic activity. It contains carbohydrates, alkaloids, flavonoids, tannins, saponins, carotenoids gallic acid, palmitic acid, caftaric acid, isorahmnitin-3-O-β-D-glucopyranoside, buphanidine, diethyl phthalate, 6-methyl-1-octanol, 3,3-dimethylhexanal, proteins, and phytosterols. It also contains a rare homoisoflavonoid Cambodianol. Peer-reviewed articles on S. roxburghiana were acquired on Scopus, scholar, Researchgate, ScienceDirect and SciFinder, there was no specific timeline set for the search. A focus group discussion was held with different communities in satkhira to further understand ethnobotanical uses of the plant. This review is an attempt to provide a comprehensive overview of the ethnobotany, phytochemistry and biological activity of Sansevieria roxburghiana in a succinct form so that curious researchers get all about the medicinal properties of Sansevieria roxburghiana at a glance and possibly make recommendations for further research.
    Źródło:
    World Scientific News; 2016, 59; 24-34
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plant extract as biodegradable inhibitor for zinc in dilute solution of sulphuric acid
    Autorzy:
    Onukwuli, O. D.
    Ezeugo, J. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1163555.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Picralima nitida leaf
    Zinc
    corrosion
    inhibition
    inhibitor
    Opis:
    The inhibitive action of the ethanol extract of oil from Picralima nitida leaf, towards acid corrosion of zinc, is tested using weight loss, and thermometry methods. It was found that the extract acted as a good corrosion inhibitor for zinc corrosion in 0.5 M H2SO4 solution. The inhibitive action of the extract was discussed in view of Langmuir adsorption isotherm. It was revealed that the adsorption of the extract on zinc surface is governed by spontaneous process. The inhibition efficiency (IE) increases in line with corresponding increase in extract concentration. The temperature effect of the corrosion inhibition on the IE was studied. Revelation from the studies indicates that the presence of extract increases the activation energy of the corrosion reaction. Furthermore, from the calculated thermodynamic parameters, it was observed that Picralima nitida extract provides a good protection to zinc against pitting corrosion in chloride ion containing solutions.
    Źródło:
    World Scientific News; 2018, 109; 195-210
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and optimization study of Ficus exasperata extract as corrosion inhibitor for mild steel in seawater
    Autorzy:
    Oyewole, O.
    Aondoakaa, E.
    Abayomi, T. S.
    Ogundipe, S. J.
    Oshin, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031411.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Corrosion
    Ficus exasperata
    inhibition efficiency
    optimization
    weight loss
    Opis:
    This study investigated the characterization of Ficus exasperata extract and the optimization of the process variables on inhibition of mild steel in seawater environment. Box Behnken Design was employed to examine the influence of three process variables: Temperature: 25-29 °C; Time: 3 – 6 days; Inhibitor concentration: 1-5 v/v. Phytochemical screening of the extract was done. The physicochemical constituents of the seawater were also determined. The experimental data was statistically determined and Scanning Electron Microscope (SEM) was used to characterize the mild steel. The result of the phytochemical screening of the Ficus exasperata plant extract (FEPE) showed the presence of contain inhibitive constituents: alkaloids, tannins, saponins, flavonoids and glycosides. The highest inhibition efficiency of 86.31% at a temperature of 29 ℃ for 6days at an inhibition concentration of 3v/v was observed from the experimental run. The optimal process levels of time: 5.74 days, temperature: 27.95 ℃ and inhibitor concentration: 2.90v/v, gave 87.52% as its inhibition efficiency. The result of the SEM from the optimal process level validated showed that more passive film was formed which can be attributed to the adsorption of the Ficus exasperata extract. It can be concluded that the Ficus exasperata was a good eco-friendly inhibitor.
    Źródło:
    World Scientific News; 2021, 151; 78-94
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the corrosion inhibition effect of Ipomoea batatas leaves extract on mild steel in sulphuric acid
    Autorzy:
    Udowo, V. M.
    Uwah, I. E.
    Magu, T. O.
    Thomas, U. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178378.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ethanolic extract of Ipomoea batatas leaves (EEIBL)
    Gasometry
    Gravimetry
    Ipomoea batatas
    Langmuir Isotherm
    Opis:
    The inhibition of mild steel corrosion in 1 M sulphuric acid media by ethanolic extracts of Ipomoea batatas was investigated using the gravimetric and gasometric methods. The extracts recorded an inhibition efficiency of 61.1 % and 52.6 % at room temperature for the gravimetry and the gasometry respectively. The inhibition process was initiated by the physical adsorption of the inhibitor extracts to the metal surface and the data obtained fitted very well into the Langmuir adsorption isotherm.
    Źródło:
    World Scientific News; 2017, 77, 2; 354-361
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth Characteristics and Tracing Antagonistic Properties of Bacillus flexus and Bacillus subtilis as Antibacterials to Overcome the Attack of Aeromonas hydrophila Bacteria on Fish
    Autorzy:
    Amatulloh, Zulfahana
    Mulyani, Yuniar
    Dewanti, Lantun Paradhita
    Haetami, Kiki
    Powiązania:
    https://bibliotekanauki.pl/articles/1193472.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aeromonas hydrophila
    Bacillus carboniphilus
    Bacillus flexus
    Bacillus haynesii
    Bacillus subtilis
    Bacillus tequilensis
    Bacillus zhangzhouensis
    Inhibition Zone Test
    fish
    Opis:
    This research was conducted to assess the antibacterial potential of Bacillus flexus and Bacillus subtilis against Aeromonas hydrophila. Bacterial samples came from the stock of the FPIK Unpad Biotechnology Laboratory. This research was conducted in July 2020 - May 2021 in Laboratorium Biotechnology FPIK Padjadjaran University. This research was conducted using qualitative and quantitative descriptive analysis. Bacteria were collected using the purposive sampling method, Observation of the growth curve using the turbidimetric method, and the disc diffusion method for the inhibition zone test with bacterial supernatant treatment with a concentration of 50%, a concentration of 100%, bacterial culture, chloramphenicol antibiotics with a concentration of 4000 ppm as a positive control. The results showed that B. flexus bacteria experienced an exponential phase at 6 to 12 hours, after which it entered a stationary phase at 14 to 72 hours. B. subtilis bacteria experienced an exponential phase at 20 hours. Until 40 hours, then experiencing a stationary phase at 42 hours to 72 hours, and the growth of A. hydrophila bacteria experiences an exponential phase at 6 hours to 28 hours, the stationary phase at 30 to 28 hours 72. Based on the results of the inhibition zone test, it showed the formation of the inhibition zone only in the positive control treatment, while the supernatant and bacterial cultures of B. flexus and B. subtilis didn’t form an inhibition zone.
    Źródło:
    World Scientific News; 2021, 158; 91-104
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Third Option for Stopping Cancer: Complex, Temporally Patterned Weak Magnetic Fields- Critical Factors That Influence Their Efficacy and Potential Mechanisms
    Autorzy:
    Murugan, Nirosha J.
    Rouleau, Nicolas
    Persinger, Michael A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191252.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    new treatments for malignancy
    geomagnetic vector differences
    interactions with patterned magnetic fields
    cancer inhibition
    copper blocking
    Aharanov-Bohm applications
    Dicke quantum optics application
    Opis:
    One of the most promising technologies for suppressing the growth of malignant (cancer) cells without adversely affecting normal cells involves the application of physiologically-patterned and bioquantum compatible magnetic fields with specific temporal increments generated by optocoupler circuits through each of the three spatial planes. However, experimentally generated magnetic field patterns designed to target cancer cells are also immersed within the magnetic environment of the incubators. We measured anomalous alterations in the horizontal (primarily “east-west”) component of the geomagnetic static field intensity within cell incubators when the most effective experimental field was being generated between three sets of solenoids. The eccentric response was a function of the six solenoids being wrapped or not wrapped with copper foil. In addition, activating or deactivating the experimental field for fixed increments was associated with discrete and obvious DC shifts in the horizontal component as well as emergent patterns that were not a component of either the experimental field or the background incubator 60 Hz source. If the temporal pattern that defines the effects induced by these magnetic fields is analogous to the spatial patterns that define chemical functions, failure to accommodate these anisotropic transients could be a source of the frequent contradictions and inter-laboratory failures to replicate these phenomena. We suggest that the emergent phenomena from these interactions with quantum-like features may be the causal variables responsible for many of the promising effects for cancer suppression. A modified Dicke model derived from quantum optics where cells cooperatively interact with a single mode of the field and their dipole fields interact coherently may accommodate the observed effects.
    Źródło:
    World Scientific News; 2016, 54; 267-288
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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