Recently, Metal chalcogenides have received considerable interest in the field of energy storage devices. In this work, tin selenide-polypyrrole (SnSe-PPy) nanocomposite has been synthesized by hydrothermal method and its supercapacitive behavior is investigated. The synthesized SnSe-PPy nanocomposite is analyzed by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and electrochemical characterization. XRD confirms the existence of orthorhombic SnSe, and the FTIR result reveals the presence of polypyrrole. The supercapacitive behavior of SnSe-PPy nanocomposite is studied by cyclic voltammetry and galvanostatic charge-discharge studies. SnSe-PPy nanocomposite delivers the specific capacitance of 223 F g-1 at 10 mV sec -1. The addition of polypyrrole increases the conductivity of the material and improves its supercapacitive behavior.
最近，金属卤化物在储能设备领域受到了广泛关注。本研究采用水热法合成了硒化锡-聚吡咯（SnSe-PPy）纳米复合材料，并对其超级电容行为进行了研究。通过 X 射线衍射（XRD）、傅立叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和电化学特性分析了合成的 SnSe-PPy 纳米复合材料。XRD 证实了正交锡硒的存在，傅立叶变换红外光谱结果显示了聚吡咯的存在。通过循环伏安法和电静态充放电法研究了 SnSe-PPy 纳米复合材料的超级电容行为。SnSe-PPy 纳米复合材料在 10 mV sec -1 时的比电容为 223 F g-1。聚吡咯的加入增加了材料的导电性，改善了其超级电容行为。
{"title":"Superior electrochemical performance of SnSe-PPy nanocomposites for supercapacitor application","authors":"Yashna Anthony, V. Ragupathi","doi":"10.62638/zasmat1002","DOIUrl":"https://doi.org/10.62638/zasmat1002","url":null,"abstract":"Recently, Metal chalcogenides have received considerable interest in the field of energy storage devices. In this work, tin selenide-polypyrrole (SnSe-PPy) nanocomposite has been synthesized by hydrothermal method and its supercapacitive behavior is investigated. The synthesized SnSe-PPy nanocomposite is analyzed by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and electrochemical characterization. XRD confirms the existence of orthorhombic SnSe, and the FTIR result reveals the presence of polypyrrole. The supercapacitive behavior of SnSe-PPy nanocomposite is studied by cyclic voltammetry and galvanostatic charge-discharge studies. SnSe-PPy nanocomposite delivers the specific capacitance of 223 F g-1 at 10 mV sec -1. The addition of polypyrrole increases the conductivity of the material and improves its supercapacitive behavior.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rajendran Susai, A. Al-Hashem, Arjunan Krishnaveni, L. Arockiaraj, Gurmeet Singh, Č. Lačnjevac, Murugan Naga Jothi, Pooviah Shanthy
The inhibition efficiency of an aqueous extract of apple juice in controlling corrosion of mild steel immersed in simulated concrete pore solution (SCPS) prepared in sea water, has been evaluated by weight loss method. Langmuir adsorption isotherm has been investigated. The mechanistic aspect of corrosion inhibition has been investigated by Electrochemical impedance spectra (AC impedance spectra). The protective film has been analysed by Fluorescence spectroscopy, FTIR spectroscopy and AFM. The SCPS system offers 60% inhibition efficiency to mild steel immersed in sea water. In presence of apple juice extract the inhibition efficiency increases as the concentration of the extract increases. When 10 ml of extract is added, 85% inhibition efficiency is obtained. Electrochemical impedance spectra (AC impedance spectra) reveal that a protective film is formed on the metal surface. In the presence of inhibitor system, charge transfer resistance value increases, impedance value increases, phase angle value increases whereas double layer capacitance value decreases as expected. The FTIR spectral study reveals that the protective film consists of complexes consisting of iron-active principles of the apple juice extract. AFM study reveals that when the inhibition efficiency increases the roughness of the surface decreases or in other words the smoothness of the system increases.
{"title":"Corrosion inhibition by fruit extracts -Inhibition of corrosion of mild steel in simulated concrete pore solution prepared in sea water by an aqueous extract of apple juice- A Case study","authors":"Rajendran Susai, A. Al-Hashem, Arjunan Krishnaveni, L. Arockiaraj, Gurmeet Singh, Č. Lačnjevac, Murugan Naga Jothi, Pooviah Shanthy","doi":"10.62638/zasmat1040","DOIUrl":"https://doi.org/10.62638/zasmat1040","url":null,"abstract":"The inhibition efficiency of an aqueous extract of apple juice in controlling corrosion of mild steel immersed in simulated concrete pore solution (SCPS) prepared in sea water, has been evaluated by weight loss method. Langmuir adsorption isotherm has been investigated. The mechanistic aspect of corrosion inhibition has been investigated by Electrochemical impedance spectra (AC impedance spectra). The protective film has been analysed by Fluorescence spectroscopy, FTIR spectroscopy and AFM. The SCPS system offers 60% inhibition efficiency to mild steel immersed in sea water. In presence of apple juice extract the inhibition efficiency increases as the concentration of the extract increases. When 10 ml of extract is added, 85% inhibition efficiency is obtained. Electrochemical impedance spectra (AC impedance spectra) reveal that a protective film is formed on the metal surface. In the presence of inhibitor system, charge transfer resistance value increases, impedance value increases, phase angle value increases whereas double layer capacitance value decreases as expected. The FTIR spectral study reveals that the protective film consists of complexes consisting of iron-active principles of the apple juice extract. AFM study reveals that when the inhibition efficiency increases the roughness of the surface decreases or in other words the smoothness of the system increases.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Snežana Marković, Bojana M. Radojković, B. Jegdić, Aleksandar Jovanović, Jovica Stojanović, Milan Trumić, V. Manojlović
The corrosion behaviour of three types of alloys (two low-alloy carbon steel and one stainless iron with ~15 wt.% Cr), in a solution which simulates seawater (3% NaCl solution, pH 8.1) was tested. Tested samples are used to make steel (iron) balls applied in mils for grinding copper and other ore. The corrosion tests were performed using three electrochemical methods, at room temperature in the presence of atmospheric oxygen. The linear polarization resistance (LPR) method, electrochemical impedance spectroscopy (EIS) method, and linear sweep voltammetry (LSV) method were applied. Based on measurements by LPR and EIS methods (as non-destructive methods), the value of polarization resistance (Rp) was determined and the general corrosion rate (vcorr) of the examined samples was calculated. The obtained values of the general corrosion rate can be used to calculate the service life of steel (iron) balls under exploitation conditions (seawater). The appearance of the surface after linear sweep voltammetry (LSV) measurement showed the presence of localized corrosion (pits were formed) of the tested samples, especially stainless iron, and the LSV method is not suitable for the determination of the general corrosion rate of tested samples in seawater. This form of corrosion occurs at high anodic polarizations, during performing LSV measurements.
{"title":"Corrosion behavior of high- and low-chromium steel grinding balls in chloride solution","authors":"Snežana Marković, Bojana M. Radojković, B. Jegdić, Aleksandar Jovanović, Jovica Stojanović, Milan Trumić, V. Manojlović","doi":"10.62638/zasmat998","DOIUrl":"https://doi.org/10.62638/zasmat998","url":null,"abstract":"The corrosion behaviour of three types of alloys (two low-alloy carbon steel and one stainless iron with ~15 wt.% Cr), in a solution which simulates seawater (3% NaCl solution, pH 8.1) was tested. Tested samples are used to make steel (iron) balls applied in mils for grinding copper and other ore. The corrosion tests were performed using three electrochemical methods, at room temperature in the presence of atmospheric oxygen. The linear polarization resistance (LPR) method, electrochemical impedance spectroscopy (EIS) method, and linear sweep voltammetry (LSV) method were applied. Based on measurements by LPR and EIS methods (as non-destructive methods), the value of polarization resistance (Rp) was determined and the general corrosion rate (vcorr) of the examined samples was calculated. The obtained values of the general corrosion rate can be used to calculate the service life of steel (iron) balls under exploitation conditions (seawater). The appearance of the surface after linear sweep voltammetry (LSV) measurement showed the presence of localized corrosion (pits were formed) of the tested samples, especially stainless iron, and the LSV method is not suitable for the determination of the general corrosion rate of tested samples in seawater. This form of corrosion occurs at high anodic polarizations, during performing LSV measurements.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140240501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The pursuit of finely tuned material properties has driven the exploration of annealing strategies in the context of Samarium Silica Nanocomposites (Sm-SiO2 NCs) synthesized through the sol-gel route. This study unveils novel insights into the influence of optimized annealing protocols on the structural and functional evolution of these advanced nanocomposites. Through meticulous experimentation, we establish that controlled temperature annealing plays a pivotal role in tailoring the microstructure and properties of Sm-SiO2 NCs. The judicious manipulation of annealing parameters, including temperature duration, and atmosphere, orchestrates distinct transformations in the composite architecture. Field emission microscopy and structural analysis reveal that precise annealing promotes the consolidation of nanoscale domains, leading to improved crystallinity and enhanced connectivity between samarium species and the silica matrix. Moreover, the annealing-induced modifications extend beyond structural aspects to influence functional properties, an increase in crystallite size was observed from 15 nm to 43 nm as an effect of annealing. Our findings illustrate a remarkable enhancement in luminescence intensity as a consequence of optimized annealing, showcasing the potential for tailored photonic applications. These revelations are supported by a comprehensive suite of analytical techniques, including X-ray diffraction, Fourier transform infra red,Field emission with Energy dispersive x-ray and photoluminescence spectroscopy. The synthesis-annealing synergy not only advances our fundamental understanding of nanocomposite evolution but also furnishes a pathway towards designing multifunctional materials with precision-engineered attributes.
对精细调整材料特性的追求推动了对通过溶胶-凝胶路线合成的钐硅纳米复合材料（Sm-SiO2 NCs）退火策略的探索。本研究揭示了优化退火方案对这些先进纳米复合材料结构和功能演变的影响。通过细致的实验，我们确定了可控温度退火在调整 Sm-SiO2 NCs 的微观结构和性能方面起着关键作用。通过对退火参数（包括温度持续时间和气氛）的合理控制，复合材料结构发生了明显的变化。场发射显微镜和结构分析表明，精确的退火促进了纳米级畴的巩固，从而提高了结晶度，并增强了钐物种与二氧化硅基体之间的连接性。此外，退火诱导的改性还超出了结构方面的范围，对功能特性产生了影响，在退火的作用下，晶体尺寸从 15 纳米增加到 43 纳米。我们的研究结果表明，优化退火可显著提高发光强度，从而展示出定制光子应用的潜力。这些发现得到了一整套分析技术的支持，包括 X 射线衍射、傅立叶变换红外光谱、能量色散 X 射线场发射和光致发光光谱。合成-退火协同作用不仅增进了我们对纳米复合材料演化的基本了解，还为设计具有精密工程属性的多功能材料提供了途径。
{"title":"Impact of annealing on structural and optical properties of sol-gel derived samarium silica nanocomposites","authors":"Aryan Boora, Bhavna Rohilla, Priya Malik, Supriya Sehrawat, Sushma Kumari, Anisha Sharma, Kirti Dahiya, S. Duhan","doi":"10.62638/zasmat1011","DOIUrl":"https://doi.org/10.62638/zasmat1011","url":null,"abstract":"The pursuit of finely tuned material properties has driven the exploration of annealing strategies in the context of Samarium Silica Nanocomposites (Sm-SiO2 NCs) synthesized through the sol-gel route. This study unveils novel insights into the influence of optimized annealing protocols on the structural and functional evolution of these advanced nanocomposites. Through meticulous experimentation, we establish that controlled temperature annealing plays a pivotal role in tailoring the microstructure and properties of Sm-SiO2 NCs. The judicious manipulation of annealing parameters, including temperature duration, and atmosphere, orchestrates distinct transformations in the composite architecture. Field emission microscopy and structural analysis reveal that precise annealing promotes the consolidation of nanoscale domains, leading to improved crystallinity and enhanced connectivity between samarium species and the silica matrix. Moreover, the annealing-induced modifications extend beyond structural aspects to influence functional properties, an increase in crystallite size was observed from 15 nm to 43 nm as an effect of annealing. Our findings illustrate a remarkable enhancement in luminescence intensity as a consequence of optimized annealing, showcasing the potential for tailored photonic applications. These revelations are supported by a comprehensive suite of analytical techniques, including X-ray diffraction, Fourier transform infra red,Field emission with Energy dispersive x-ray and photoluminescence spectroscopy. The synthesis-annealing synergy not only advances our fundamental understanding of nanocomposite evolution but also furnishes a pathway towards designing multifunctional materials with precision-engineered attributes.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140236994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biofriendly conducting polymeric blends and composites exhibiting high dielectric constant and dielectric loss are promising for applications as sensors, actuators, microwave absorbing materials, fuel cells and biomedical applications. A great deal of work is reported on using fillers such as conductive nanomaterials, bio ceramics, carbon nanotubes, graphene etc in blends of Polyvinylchloride, Polyvinylpyrrolidone, Polymethylmethacrylate, Polyvinyl alcohol with conducting polymer Polypyrrole, Polyaniline for enhancing their conductivities, tailoring dielectric and electrical, thermal and surface properties of such polymeric materials. However, appropriate dispersion of such fillers in polymeric matrices remains technically challenging. In this regard, bio-ionic liquids have emerged as a novel class of materials and their combination with specific polymer blends opens the possibility to develop smart novel materials with different morphologies. Present work aims to explore the low frequency dielectric properties exhibited by free standing, flexible, biofriendly/biodegradable ternary polymer blend film of Polyvinylchloride-Polyvinylpyrrolidone-Polypyrrole reinforced with choline acetate. The detailed analysis of low frequency dielectric properties authenticates that addition of choline acetate result in modifying the dielectric properties of ternary polymer blend film.. The harmlessness of these films was confirmed from disk diffusion test indicating their benign nature towards (Escherichia coli) (CFT073) and (Bacillus subtilis). Therefore, the developed films can potentially be used for various scale multifunctional dielectric and electrical applications working in close contact with living matter, green electronics and various health monitoring systems.
{"title":"Tuning low frequency dielectric properties of flexible ternary polymer blend film reinforced with bio- ionic liquid for the application in green electronics","authors":"V. Bhavsar, D. Tripathi","doi":"10.62638/zasmat1001","DOIUrl":"https://doi.org/10.62638/zasmat1001","url":null,"abstract":"Biofriendly conducting polymeric blends and composites exhibiting high dielectric constant and dielectric loss are promising for applications as sensors, actuators, microwave absorbing materials, fuel cells and biomedical applications. A great deal of work is reported on using fillers such as conductive nanomaterials, bio ceramics, carbon nanotubes, graphene etc in blends of Polyvinylchloride, Polyvinylpyrrolidone, Polymethylmethacrylate, Polyvinyl alcohol with conducting polymer Polypyrrole, Polyaniline for enhancing their conductivities, tailoring dielectric and electrical, thermal and surface properties of such polymeric materials. However, appropriate dispersion of such fillers in polymeric matrices remains technically challenging. In this regard, bio-ionic liquids have emerged as a novel class of materials and their combination with specific polymer blends opens the possibility to develop smart novel materials with different morphologies. Present work aims to explore the low frequency dielectric properties exhibited by free standing, flexible, biofriendly/biodegradable ternary polymer blend film of Polyvinylchloride-Polyvinylpyrrolidone-Polypyrrole reinforced with choline acetate. The detailed analysis of low frequency dielectric properties authenticates that addition of choline acetate result in modifying the dielectric properties of ternary polymer blend film.. The harmlessness of these films was confirmed from disk diffusion test indicating their benign nature towards (Escherichia coli) (CFT073) and (Bacillus subtilis). Therefore, the developed films can potentially be used for various scale multifunctional dielectric and electrical applications working in close contact with living matter, green electronics and various health monitoring systems.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Prifiharni, Amalia Rizky Sabilla, G. Priyotomo, A. Nikitasari, Rahayu Kusumastuti, S. Musabikha, R. N. Hakim, Y. Dwiyanti, B. Kambuna
Plant derivatives as eco-friendly corrosion inhibitors are currently greatly interested in much research. Shallot leaf (Allium cepa) was utilized in 0.1M HCl as a corrosion inhibitor of mild steel. The functional groups present in the macerated extract were subsequently identified using an FTIR test. Electrochemical tests such as tafel polarization and EIS were carried out to determine the corrosion inhibition performance of shallot leaf extract on the SS400 steel. The results of the electrochemical analysis show that shallot leaf extract can inhibit mild steel up to 94% at a concentration of 500 ppm. Furthermore, the addition of SLE reduces surface damage of mild steel, which can be seen by SEM.
{"title":"Electrochemical analysis of corrosion inhibition shallot leaf (Allium cepa) extract on mild steel in acidic medium at different immersion times","authors":"S. Prifiharni, Amalia Rizky Sabilla, G. Priyotomo, A. Nikitasari, Rahayu Kusumastuti, S. Musabikha, R. N. Hakim, Y. Dwiyanti, B. Kambuna","doi":"10.62638/zasmat1006","DOIUrl":"https://doi.org/10.62638/zasmat1006","url":null,"abstract":"Plant derivatives as eco-friendly corrosion inhibitors are currently greatly interested in much research. Shallot leaf (Allium cepa) was utilized in 0.1M HCl as a corrosion inhibitor of mild steel. The functional groups present in the macerated extract were subsequently identified using an FTIR test. Electrochemical tests such as tafel polarization and EIS were carried out to determine the corrosion inhibition performance of shallot leaf extract on the SS400 steel. The results of the electrochemical analysis show that shallot leaf extract can inhibit mild steel up to 94% at a concentration of 500 ppm. Furthermore, the addition of SLE reduces surface damage of mild steel, which can be seen by SEM.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
controlling the corrosion of mild steel in simulated oil well water (SOWW). Weight loss method reveals that 10 % v/v of the extract offers 82 % inhibition efficiency (IE) to mild steel (MS) immersed SOWW. The mechanistic aspects of corrosion inhibitive effect have been investigated by polarization study and AC impedance spectra. Polarization study reveals that the mixed type of inhibitor in the presence of inhibitor system. The corrosion inhibition effect is confirmed by the increase in the linear polarization resistance value and decrease in the corrosion current value. The protective layer is formed on the metal surface is confirmed by the AC impedance spectra. This is confirmed by the fact that there is increase in charge transfer resistance value and decrease in the double layer capacitance value. The adsorption of inhibitor molecule obey Langmuir adsorption isotherm. The protective coating is characterized by FTIR spectroscopy. It confirms that the inhibitor has coordinated with ferrous ion the metal surface through the active principle component of β-sitosterol, quercetin and kaempferol-3-xylosylglucoside. The surface morphology has been investigated by scanning electron microscopy (SEM). Hence, aqueous extract of Hibiscus rosa-sinensis flower with simulated oil well water good corrosive inhibitive effect on pipeline made of mild steel.
{"title":"Inhibition of corrosion of mild steel in simulated oil well waterby aqueous extract of Hibiscus rosa-sinensis flower","authors":"Balakrishnan Latha, Kaliyaperumal Kavitha, Rajendran Susai","doi":"10.62638/zasmat1005","DOIUrl":"https://doi.org/10.62638/zasmat1005","url":null,"abstract":"controlling the corrosion of mild steel in simulated oil well water (SOWW). Weight loss method reveals that 10 % v/v of the extract offers 82 % inhibition efficiency (IE) to mild steel (MS) immersed SOWW. The mechanistic aspects of corrosion inhibitive effect have been investigated by polarization study and AC impedance spectra. Polarization study reveals that the mixed type of inhibitor in the presence of inhibitor system. The corrosion inhibition effect is confirmed by the increase in the linear polarization resistance value and decrease in the corrosion current value. The protective layer is formed on the metal surface is confirmed by the AC impedance spectra. This is confirmed by the fact that there is increase in charge transfer resistance value and decrease in the double layer capacitance value. The adsorption of inhibitor molecule obey Langmuir adsorption isotherm. The protective coating is characterized by FTIR spectroscopy. It confirms that the inhibitor has coordinated with ferrous ion the metal surface through the active principle component of β-sitosterol, quercetin and kaempferol-3-xylosylglucoside. The surface morphology has been investigated by scanning electron microscopy (SEM). Hence, aqueous extract of Hibiscus rosa-sinensis flower with simulated oil well water good corrosive inhibitive effect on pipeline made of mild steel.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An investigation of the electrochemical behaviour of Ni-Ti alloy when exposed to artificial blood plasma (ABP) in the presence of 0.1 and 0.5 ppm of Trigonella foenum graecum (TFG) seeds for 1, 10, 20, and 30 days. Studies on AC impedance and polarisation have shown that a protective coating forms on the metal surface while inhibiting corrosion. The protective film has formed on the Ni-Ti implant alloy surface, the linear polarization resistance increased (LPR), and the corrosion current value (Icorr) decreased. The charge transfer resistant value (Rct) and impedance value increase and the double-layer capacitance value decrease.The protective layers morphology and the elemental composition were analyzed by SEM/EDAX. The property of the protective film on the Ni-Ti alloy has been examined by atomic force microscope. The X-ray diffraction analysis has confirmed the nature of the apatite. The corrosion inhibition efficiency of Ni-Ti alloy in ABP in the presence of TFG seeds at various concentrations for different times was improved and protected.
{"title":"Electrochemical activities of Ni-Ti alloy in artificial blood plasma with Trigonella foenum graecum seeds","authors":"Annamalai Selvam, Santiagu John, Mary, Asirvatham Ajila, Devadoss Delinta, Vijayagopal Sribharathy, Senthamarai Kannan Muthukumaran","doi":"10.62638/zasmat1004","DOIUrl":"https://doi.org/10.62638/zasmat1004","url":null,"abstract":"An investigation of the electrochemical behaviour of Ni-Ti alloy when exposed to artificial blood plasma (ABP) in the presence of 0.1 and 0.5 ppm of Trigonella foenum graecum (TFG) seeds for 1, 10, 20, and 30 days. Studies on AC impedance and polarisation have shown that a protective coating forms on the metal surface while inhibiting corrosion. The protective film has formed on the Ni-Ti implant alloy surface, the linear polarization resistance increased (LPR), and the corrosion current value (Icorr) decreased. The charge transfer resistant value (Rct) and impedance value increase and the double-layer capacitance value decrease.The protective layers morphology and the elemental composition were analyzed by SEM/EDAX. The property of the protective film on the Ni-Ti alloy has been examined by atomic force microscope. The X-ray diffraction analysis has confirmed the nature of the apatite. The corrosion inhibition efficiency of Ni-Ti alloy in ABP in the presence of TFG seeds at various concentrations for different times was improved and protected.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140239341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jelena Gojgić, A. Petričević, M. N. Krstajić Pajić, V. Jović
The example of the procedure for the correct determination of the parameters of hydrogen evolution reaction (HER), the exchange current density (jo) and relaxation time (to) for intermediate (adsorbed hydrogen, Hads) adsorption at modified porous Ni-based electrode are presented in this work. Such a procedure is applicable for the HER at all electrode materials. The value of jo was obtained from the intercept at h = 0 mV from the h vs. log (Rct-1) dependence (h - overpotential), while the value of to was obtained from the intercept at h = 0 mV from the logt vs. h dependence. It was shown that for the correct determination of jo and to, it is necessary to correct applied h for the jRs drop, by recording current density (j) for applied h and correcting it for jRs
本研究举例说明了如何正确确定氢进化反应（HER）参数、交换电流密度（Jo）和改性多孔镍基电极吸附中间体（吸附氢，Hads）的弛豫时间（to）。该方法适用于所有电极材料上的 HER。根据 h 与 log (Rct-1) 的依赖关系（h - 过电位），从 h = 0 mV 处的截距得到 jo 值，而根据 logt 与 h 的依赖关系，从 h = 0 mV 处的截距得到 to 值。结果表明，要正确确定 jo 和 to 值，必须根据 jRs 下降情况校正施加的 h，方法是记录施加 h 时的电流密度 (j)，并根据 jRs 对其进行校正。
{"title":"Correct determination of the hydrogen evolution reaction parameters at Ni foam electrode modified by electrodeposited Ni-Sn alloy layer","authors":"Jelena Gojgić, A. Petričević, M. N. Krstajić Pajić, V. Jović","doi":"10.62638/zasmat1039","DOIUrl":"https://doi.org/10.62638/zasmat1039","url":null,"abstract":"The example of the procedure for the correct determination of the parameters of hydrogen evolution reaction (HER), the exchange current density (jo) and relaxation time (to) for intermediate (adsorbed hydrogen, Hads) adsorption at modified porous Ni-based electrode are presented in this work. Such a procedure is applicable for the HER at all electrode materials. The value of jo was obtained from the intercept at h = 0 mV from the h vs. log (Rct-1) dependence (h - overpotential), while the value of to was obtained from the intercept at h = 0 mV from the logt vs. h dependence. It was shown that for the correct determination of jo and to, it is necessary to correct applied h for the jRs drop, by recording current density (j) for applied h and correcting it for jRs","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140240525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nkemakolam Chinedu Izuwa, S. Ekwueme, N. Okereke, O. Nwanwe, N. Ohia
This study considers the process simulation of geothermal binary Organic Rankine Cycle (ORC) systems which utilizes CO2 and water as geofluids for electricity generation. The simulation was performed using Hysys v11 software by using Peng Robinson’s fluid property package. Two dry working fluids including isopentane and n-pentane, were used. The effects of geofluid temperature and working fluid mass flowrate on power generation, as well as the maximum pressure of working fluids were evaluated. The result showed that power generation increases with higher geofluid temperature due to enhanced heat transfer. Isopentane outperformed n-pentane, attributed to its superior thermodynamic properties. CO2 showed better performance as geofluid than water highlighting its superiority, observed in the increased power generation. The unique characteristics of CO2 enable efficient heat transfer at lower temperatures, making it an environmentally friendly and effective choice. Contrarily, the use of water as a geofluid poses some implications for local ecosystems and water resources. From an environmental perspective, CO2 shows greater potential for reduced environmental impact, which aligns with the transition to cleaner energy sources. However, the economic considerations suggest a trade-off, as CO2 projects may entail higher upfront costs compared to water-based systems. Regulatory factors and economic feasibility, therefore, play a crucial role in the choice of geofluid for geothermal power generation.
{"title":"Comparative analysis of geothermal binary ORC systems: performance and environmental considerations for CO2 andwater as geofluids","authors":"Nkemakolam Chinedu Izuwa, S. Ekwueme, N. Okereke, O. Nwanwe, N. Ohia","doi":"10.62638/zasmat1009","DOIUrl":"https://doi.org/10.62638/zasmat1009","url":null,"abstract":"This study considers the process simulation of geothermal binary Organic Rankine Cycle (ORC) systems which utilizes CO2 and water as geofluids for electricity generation. The simulation was performed using Hysys v11 software by using Peng Robinson’s fluid property package. Two dry working fluids including isopentane and n-pentane, were used. The effects of geofluid temperature and working fluid mass flowrate on power generation, as well as the maximum pressure of working fluids were evaluated. The result showed that power generation increases with higher geofluid temperature due to enhanced heat transfer. Isopentane outperformed n-pentane, attributed to its superior thermodynamic properties. CO2 showed better performance as geofluid than water highlighting its superiority, observed in the increased power generation. The unique characteristics of CO2 enable efficient heat transfer at lower temperatures, making it an environmentally friendly and effective choice. Contrarily, the use of water as a geofluid poses some implications for local ecosystems and water resources. From an environmental perspective, CO2 shows greater potential for reduced environmental impact, which aligns with the transition to cleaner energy sources. However, the economic considerations suggest a trade-off, as CO2 projects may entail higher upfront costs compared to water-based systems. Regulatory factors and economic feasibility, therefore, play a crucial role in the choice of geofluid for geothermal power generation.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140239036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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