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Articles 1441 - 1470 of 5705

Full-Text Articles in Engineering

Graphene Derivatives Reinforced Metal Matrix Nanocomposite Coatings: A Review, Hamed Sadabadi, Omid Ghaderi, Amir Kordijazi, Pradeep K. Rohatgi Jan 2022

Graphene Derivatives Reinforced Metal Matrix Nanocomposite Coatings: A Review, Hamed Sadabadi, Omid Ghaderi, Amir Kordijazi, Pradeep K. Rohatgi

Journal of Metals, Materials and Minerals

Due to the extraordinary mechanical, thermal, and electrical properties of graphene, graphene oxide (GO), and reduced graphene oxide (rGO), these materials have the potential to become ideal nanofillers in the electrodeposited nanocomposite coatings. This article provides an overview of literature on the improvements of properties associated with graphene, GO, and rGO-reinforced coatings, along with the processing parameters and mechanisms that would lead to these improvements in electrodeposited metal matrix nanocomposite coatings, where those affected the microstructural, mechanical, tribological, and anti-corrosion characteristics of coatings. The challenges associated with the electroplating of nanocomposite coatings are addressed. The results of this survey indicated …

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The Correlation Between Phase Formation And The Structure Of The Pellets With The Fungal Immobilization Study As A Commercial Substrate Culture/Planting Material, Rattiphorn Sumang, Rampai Kodsueb, Narathip Vitayakorn, Ruangwut Chutima Jan 2022

The Correlation Between Phase Formation And The Structure Of The Pellets With The Fungal Immobilization Study As A Commercial Substrate Culture/Planting Material, Rattiphorn Sumang, Rampai Kodsueb, Narathip Vitayakorn, Ruangwut Chutima

Journal of Metals, Materials and Minerals

Calcined clay pellets are popular planting material for those who love to grow plants in pots. The calcined clay pellets consist of clay (C), phosphate rock (PR), and rice husk ash (RHA). [(1-x)(50C–50PR)-xRHA], x(RHA) = 0, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and 0.65 wt% were prepared by a conventional solid-state reaction method. The samples were made into a spherical shape with a diameter of 10 mm and fired at 600℃ to 1000℃. The effect of x contents on phase formation, microstructure, and chemical properties of [(1-x)(50C–50PR)-xRHA] was studied. X-ray diffraction revealed the typical assemblages with quartz, illite, …

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Synthesis And Antimicrobial Studies Of Nano-Copper Doped Carbon Substrates; Activated Carbon, Reduced Graphene Oxide, And Carbon Nanofiber, Songwuit Chanthee, Jenjira Jirasangthong, Channarong Asasvatesanupap, Malee Santikunaporn Jan 2022

Synthesis And Antimicrobial Studies Of Nano-Copper Doped Carbon Substrates; Activated Carbon, Reduced Graphene Oxide, And Carbon Nanofiber, Songwuit Chanthee, Jenjira Jirasangthong, Channarong Asasvatesanupap, Malee Santikunaporn

Journal of Metals, Materials and Minerals

Copper oxides (CuxO) have received considerable attention as a result of their biological activity. Nanoparticles (NPs) of CuxO attached to different substrates exhibit a wide spectrum of antimicrobial activity against bacteria and viruses, with similar properties to silver. The antimicrobial activity of CuxO-NPs doped on distinctive carbon materials was investigated for three carbon substrates: apricot stone activated carbon (AAC), reduced graphene oxide (rGO) and carbon nanofiber (CNF). The CuxO-NPs (5 wt%) doped AAC and rGO substrates were prepared by impregnation of copper nitrate followed by a thermal treatment process, while a similar weight of CuxO-NPs doped CNF was fabricated by …

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Preparation Of Feedstock Containing Water-Soluble Binder For Powder Injection Moulding Of Silver, Chuanchom Aumnate, Nithiwach Nawaukkaratharnant, Nutthita Chuankrerkkul Jan 2022

Preparation Of Feedstock Containing Water-Soluble Binder For Powder Injection Moulding Of Silver, Chuanchom Aumnate, Nithiwach Nawaukkaratharnant, Nutthita Chuankrerkkul

Journal of Metals, Materials and Minerals

Feedstock for powder injection moulding of silver was prepared using water-soluble binder composed of polyethylene glycol (PEG) and polyvinyl butyrol (PVB). Silver powders with particle size in range of 1 μm to 20 μm can be mixed with PEG/PVB binder system to form feedstocks having powder loadings of 42 vol% and 45 vol%. PEG can be removed using water leaching method while PVB can be removed by thermal debinding. Specimens retained their shapes during debinding and after debinding. Components fabricated with relatively higher powder loading resulted in higher density with lower porosity. Density of specimens containing powder loading of 42 …

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Tungsten Disulfide-Nickel Oxide Hybrids As High-Performance Supercapacitors, Zainab Ali Hrbe, Samaher Waheed Hashim Jan 2022

Tungsten Disulfide-Nickel Oxide Hybrids As High-Performance Supercapacitors, Zainab Ali Hrbe, Samaher Waheed Hashim

Journal of Metals, Materials and Minerals

Two-dimensional materials are suitable for energy storage applications due to their chemical stability, high electrical conductivity and large specific surface area. In this work, tungsten disulfide (WS2) nanosheets were synthesized by chemical exfoliation method and combined with nickel oxide (NiO) nanoparticles to be used as a working electrode for storing energy. The WS2 electrode alone shows a capacitance of about 21.87 mF⸳cm-2, which is improved up to 64.58 mF⸳cm-2 by adding NiO nanoparticles. The occurrence of redox reactions plays an important role in increasing the final capacitance. Moreover, the proposed hybrid maintains 93% of its initial capacitance after 5000 charge-discharge …

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The Influence Of Different Crystal Modifiers On Ultra-Low Embodied Energy Curing Fiber-Reinforced Cement Composites, Passakorn Sonprasarn, Wichit Prakaypan, Sureerat Polsilapa, Nuntaporn Kongkajun, Edward A. Laitila, Nutthita Chuankrerkkul, Parinya Chakartnarodom Jan 2022

The Influence Of Different Crystal Modifiers On Ultra-Low Embodied Energy Curing Fiber-Reinforced Cement Composites, Passakorn Sonprasarn, Wichit Prakaypan, Sureerat Polsilapa, Nuntaporn Kongkajun, Edward A. Laitila, Nutthita Chuankrerkkul, Parinya Chakartnarodom

Journal of Metals, Materials and Minerals

Fiber-reinforced cement composites (FRCC) are widely used in the construction of houses and commercial buildings in many countries such as the United States, the United Kingdom, the European countries, and the Asian countries such as China, India, and Thailand.  Conventionally, the FRCC is manufactured from Portland cement, silica sand, and cellulose fiber using the so-called autoclaved curing under a designate hydrothermal condition to accelerate the hydration reaction resulting in superior properties.  However, the autoclave-curing process needs a huge investment and generates highly environmental impact specially greenhouse gases due to its heavy energy consumption.  Hence, this research aims to develop the …

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Sequential Injection Analysis For Mercury Ion With Modified Screen – Printed Carbon Electrode, Eakkasit Punrat, Naphat Piyasart, Chalinee Auanphui, Rutanachai Thaipratum, Shoji Motomizu, Wanida Wonsawat Jan 2022

Sequential Injection Analysis For Mercury Ion With Modified Screen – Printed Carbon Electrode, Eakkasit Punrat, Naphat Piyasart, Chalinee Auanphui, Rutanachai Thaipratum, Shoji Motomizu, Wanida Wonsawat

Journal of Metals, Materials and Minerals

In this study, we developed a simple high-throughput and cost-effective method for monitoring toxic metal ion in an environmental aqueous sample. Mercury ion determination with Sequential Injection Analysis system (SIAs) coupled with the electrochemical detection on the modified screen-printed carbon working electrode (SPCE) is an alternative green analysis of mercury ion. The gold film was used as the modified material for improved mercury ion analysis in the automated system without memory effect on the electrode. Mercury oxidation signal was found at the potential of 0.7 V in 0.1 M HNO3 and 1.0 M HCl with the concentration low to 0.25 …

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Effect Of A-Site Modification On Structural And Microwave Dielectric Properties Of Calcium Titanate, Shailendra Rajput, Sunita Keshri Jan 2022

Effect Of A-Site Modification On Structural And Microwave Dielectric Properties Of Calcium Titanate, Shailendra Rajput, Sunita Keshri

Journal of Metals, Materials and Minerals

This article presents studies on characteristics properties of CaTiO3, Ca0.8Sr0.2TiO3, and Ca0.6La0.8/3TiO3 ceramics. These ceramics were synthesized using the solid-state reaction process. Structural examination revealed that the grown ceramics have an orthorhombic structure with the Pbnm space group. The random distribution of particle size was shown through morphological investigation. Apparent density of developed ceramics was determined using the Archimedes technique and found to be ˂ 90%. The microwave dielectric properties of grown ceramics are compared on the basis of ionic polarizability. It is observed that partial replacement of Ca-ions by Sr-ions provides a high permittivity value (er = 168.93), higher …

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Hole Transport Layers In Organic Solar Cells: A Review, Riva Alkarsifi, Jörg Ackermann, Olivier Margeat Jan 2022

Hole Transport Layers In Organic Solar Cells: A Review, Riva Alkarsifi, Jörg Ackermann, Olivier Margeat

Journal of Metals, Materials and Minerals

Thanks to huge research efforts, organic solar cells have become serious candidates in the field of renewable energy sources, with reported power conversion efficiencies above 19% and operating lifetime surpassing decades. In the thin film stack composing the organic solar cell, the transport layers at interfaces play a key role, as important as the photoactive material itself. Both electron (ETL) and hole (HTL) transport layers are indeed directly involved in the efficiency and stability of the devices, due to the very specific properties required for these interfaces. Focusing on the HTL interface, a large number of materials has been used …

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Research Progress Of Novel Zirconium Alloys With High Strength And Toughness, Na Zhang, Chaoqun Xia, Jiaqian Qin, Qiang Li, Xinyu Zhang, Riping Liu Jan 2022

Research Progress Of Novel Zirconium Alloys With High Strength And Toughness, Na Zhang, Chaoqun Xia, Jiaqian Qin, Qiang Li, Xinyu Zhang, Riping Liu

Journal of Metals, Materials and Minerals

Atoms of zirconium (Zr) are often known as "first metals of the atomic age". Because of its low cross section for thermal neutron absorption, excellent corrosion resistance, and good mechanical and processing properties, it is extensively used in the nuclear industry. As the properties requirements of materials in chemical, medical and aerospace fields turn out to be higher, the application of Zr alloys in these non-nuclear fields has become more and more widespread due to their excellent properties. In addition to having a high melting point, Zr alloys also have a high specific strength and low thermal expansion coefficient. Therefore, …

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Rice Husk Ash Utilization, Composition And Properties: A Brief Review, Vignesh Nayak Ullal, Shivaramu H. T., Aveen K. P. Jan 2022

Rice Husk Ash Utilization, Composition And Properties: A Brief Review, Vignesh Nayak Ullal, Shivaramu H. T., Aveen K. P.

Journal of Metals, Materials and Minerals

Asian countries rely massively on rice to feed and sustain its massive population. For long the staple food has provided nourishment to the masses and the classes. Rice is grown in large quantities in Asian countries. A by-product of its cultivation is its husk. The husk of the rice grain is mainly utilized as a fuel for the boilers in the rice mills. The uncontrolled burnt rice husk referred to as rice husk ash consists majorly of silica. silica is used in a wide variety of commercial and industrial applications. Use of rice husk ash in various products serves to …

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Extraction Of Lutein Dye From Tagetes Erecta Garland Waste For Green Dyeing Of Hemp Fabric Using Response Surface Methodology, Pisutsaran Chitichotpanya, Nattaya Vuthiganond, Thitirat Inprasit, Benjamas Klaykruayat, Seranee Srisuk Jan 2022

Extraction Of Lutein Dye From Tagetes Erecta Garland Waste For Green Dyeing Of Hemp Fabric Using Response Surface Methodology, Pisutsaran Chitichotpanya, Nattaya Vuthiganond, Thitirat Inprasit, Benjamas Klaykruayat, Seranee Srisuk

Journal of Metals, Materials and Minerals

Large quantities of discarded flowers from religious observances are left at temples and other places of worship, causing global disposal and environmental issues. Recycling and transforming such organic waste into value-added products is one of the most effective and beneficial solutions to the problem. The main goal of this study is to convert the most abundant temple wastes of marigold (Tagetes erecta) flowers into an eco-friendly dyestuff for the textile industry. Our study assessed the suitability of dye extract from garland waste for dyeing hemp fabric and valuated indicators including color strength (K/S) and fastness properties using tannic …

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Development Of Fexoy Particle Onto Bacterial Cellulose Network By Forced Hydrolysis And Its Electrical Conductivity, Prompong Khamwongsa, Poramed Wongjom, Andi Magattang Gafur Muchlisc, Chun Che Lin, Seranee Srisuk, Sarute Ummartyotin Jan 2022

Development Of Fexoy Particle Onto Bacterial Cellulose Network By Forced Hydrolysis And Its Electrical Conductivity, Prompong Khamwongsa, Poramed Wongjom, Andi Magattang Gafur Muchlisc, Chun Che Lin, Seranee Srisuk, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

FexOy particle and bacterial cellulose composite sheet was successfully prepared by forced hydrolysis. The presence of Fe3+ ions in bacterial cellulose suspension significantly provided the positive charge due to electrostatic force as reported by Zeta potential. With the pH of 12 of bacterial cellulose suspension, particle was nucleated between bacterial cellulose networks. Fourier transform infrared exhibited Fe-O stretching. X-ray diffraction reported that the mixture of Fe2O3 and Fe3O4 was existed onto bacterial cellulose composite. Scanning electron microscope reported that FexOy particle was randomly distributed in bacterial cellulose network. Intensity of Fe was qualitatively observed by energy dispersive analysis. With the …

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Morphology And Electrochromic Property Of Chemical Bath Deposited Nio Films At Different Niso4 Concentration, Watcharaporn Thongjoon, Kamon Aiempanakit, Itsarapong Chuasontia, Chantana Aiempanakit Jan 2022

Morphology And Electrochromic Property Of Chemical Bath Deposited Nio Films At Different Niso4 Concentration, Watcharaporn Thongjoon, Kamon Aiempanakit, Itsarapong Chuasontia, Chantana Aiempanakit

Journal of Metals, Materials and Minerals

In this study, nickel oxide (NiO) films were prepared on indium tin oxide (ITO) glass by a chemical bath deposition (CBD) at different nickel sulfate (NiSO4) concentrations. The NiO films were verified for their structural properties with field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) while the optical properties were investigated using a spectrophotometer. Moreover, the NiO films were studied to assess their electrochemical properties by cyclic voltammetry in potassium hydroxide (KOH) electrolyte. The results showed that annealed NiO films exhibited the dominant crystal structure of the (111) plane. Meanwhile, the NiSO4 concentration controlled morphological structure between dense …

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Optimized Parameter Of Dissimilar Joining Between Al6061-T6 And Height-Strength Steel With Friction Stir Spot Welding Process (Fssw), Anusak Silachai, Suriya Prasomthong Jan 2022

Optimized Parameter Of Dissimilar Joining Between Al6061-T6 And Height-Strength Steel With Friction Stir Spot Welding Process (Fssw), Anusak Silachai, Suriya Prasomthong

Journal of Metals, Materials and Minerals

High-strength steel and aluminum alloys are used to manufacture modern vehicles. The objective was to reduce the weight and fuel consumption of the vehicles. In this study the optimum parameters for the friction stir spot welding (FSSW) process between Al6061-T6 aluminum alloy and HSS590 high-strength steel were determined. Response surface methodology based on central composite design (CCD) with three parameters, five levels, and 19 runs was used to conduct experiments and develop mathematical regression models. The three joint parameters were tool speed, welding feed, and dwell time. Analysis of variance was then performed to examine the adequacy of the developed …

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Synthesis And Characterization Of Hybrid Shell Microcapsules For Anti-Corrosion Ni-Co Coating, Hamed Sadabadi, Saeed Reza Allahkaram, Omid Ghader, Pradeep K. Rohatgi Jan 2022

Synthesis And Characterization Of Hybrid Shell Microcapsules For Anti-Corrosion Ni-Co Coating, Hamed Sadabadi, Saeed Reza Allahkaram, Omid Ghader, Pradeep K. Rohatgi

Journal of Metals, Materials and Minerals

This paper presents the results of the study of microcapsules synthesized using a novel hybrid shell of polyureaformaldehyde/SiO2 (PUF/SiO2) and a core of linseed oil. The synthesis was accomplished by facial polymerization combined with sol-gel of TEOS, and urea-formaldehyde resin to form the hybrid shell under optimal process parameters. The microcapsules were embedded in a metal coating using the electrodeposition method. Microcapsules were characterized by scanning electron microscope (SEM, FE-SEM), energy-dispersive spectroscopy (EDS), particle size analyzer (PSA), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The experimental results indicated that the average size of capsules synthesized umder the optimum processing …

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Dyeing Of Curcumin And Durable Press Finishing With Citric Acid On Cotton Fabric Using One Step Process, Supannee Boonroeng, Piyaporn Kampeerapappun Jan 2022

Dyeing Of Curcumin And Durable Press Finishing With Citric Acid On Cotton Fabric Using One Step Process, Supannee Boonroeng, Piyaporn Kampeerapappun

Journal of Metals, Materials and Minerals

Cotton is an affordable and durable option for clothing. However, cotton garments tend to wrinkle easily. Therefore, cotton fabrics were studied to improve their wrinkle resistance properties. In this work, curcumin was mixed in an aqueous solution of citric acid and its catalyst and applied to cotton fabric using pad-dry-cure process for both the dyeing and finishing properties. Aloe vera extract and chitosan were used to compare for the reaction of their functional groups with carboxyl groups of citric acid on cotton fabrics. The mixture of curcumin and citric acid solution showed anti-wrinkle properties on the treated cotton. There were …

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Mineralogical Studies And Optimization Of Tabling Parameters Of Low Grade Chromite Ore By Box Behnken Design Of Experiments, Amit Kumar Bhandary, Siddhartha Mukherjee, Rajib Dey, Mahua Ghosh Chaudhuri Jan 2022

Mineralogical Studies And Optimization Of Tabling Parameters Of Low Grade Chromite Ore By Box Behnken Design Of Experiments, Amit Kumar Bhandary, Siddhartha Mukherjee, Rajib Dey, Mahua Ghosh Chaudhuri

Journal of Metals, Materials and Minerals

Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation of low grade chromite ore. In the present study mineralogical analysis of the sample has been carried out by using Wavelength dispersive x-ray fluorescence (WDXRF), X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX). The beneficiation of low grade (Cr2O3% 26.88) chromite ore has been investigated using wilfley table. Optimization has been carried out using box-behnken statistical design (BBD). The experimental parameters selected are: tilt angle, water flow rate and pre-heat …

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Magnetic Nanoparticles Coated With Zwitterionic Copolymer As An Advanced Material For Rapid And Instrument-Free Biomolecular Detection In Human Serum, Supannika Boonjamnian, Varunee Sadsri, Voravee P. Hoven, Piyaporn Na Nongkhai Jan 2022

Magnetic Nanoparticles Coated With Zwitterionic Copolymer As An Advanced Material For Rapid And Instrument-Free Biomolecular Detection In Human Serum, Supannika Boonjamnian, Varunee Sadsri, Voravee P. Hoven, Piyaporn Na Nongkhai

Journal of Metals, Materials and Minerals

The traditional agglutination assays especially those based on polystyrene beads have been recognized as convenient tools for disease diagnosis despite their limited detection range and low sensitivity. Unlike other particles namely polystyrene beads, SiO2 and gold nanoparticles having insignificant magnetic properties, magnetic nanoparticles (MNPs) offer unique advantages as their magnetic properties for agglutination methods. In the presence of magnet, not only can they be used to enrich the samples, but also their aggregation can also be induced, providing sensitive and rapid measurements. This work aims to develop MNPs for aggregation-based biomolecular detection. The MNPs were surface-modified with PMAMPC via an …

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Nitrogen-Sulfur Co-Doped Porous Carbon Preparation And Its Application In Lithium-Sulfur Batteries, Gui-Xiang Zhao, Wail Hafiz Zaki Ahmed, Fu-Liang Zhu Dec 2021

Nitrogen-Sulfur Co-Doped Porous Carbon Preparation And Its Application In Lithium-Sulfur Batteries, Gui-Xiang Zhao, Wail Hafiz Zaki Ahmed, Fu-Liang Zhu

Journal of Electrochemistry

In recent years, lithium-sulfur (Li-S) batteries have been considered as a promising candidate for the next generation of energy storage system due to their ultrahigh theoretical capacity (1675 mAh·g-1) and energy density (2600 Wh·kg-1). However, the practical application of Li-S batteries is seriously limited by their insulating nature of sulfur, the shuttle effect of polysulfides (LiPSs), and volume expansion during charging and discharging. To overcome those disadvantages, one of the commonly methods is to infiltrate sulfur into porous conductive carbon framework, such as porous carbon, hollow carbon spheres, graphene, carbon nanotubes and some composites of the …

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Photoelectrochemical Sensing Based On Zr-Mofs For Homocysteine Detection, Wen-Xia Dong, Guang-Ming Wen, Bin Liu, Zhong-Ping Li Dec 2021

Photoelectrochemical Sensing Based On Zr-Mofs For Homocysteine Detection, Wen-Xia Dong, Guang-Ming Wen, Bin Liu, Zhong-Ping Li

Journal of Electrochemistry

Due to the independent form of the light source and detection system, photoelectrochemical (PEC) sensor has the advantages of low background, high sensitivity and simple operation. So far, PEC systems have been widely used in the fields including the actual detection of metal ions, biological antibodies or antigens in environmental pollutants. When the photosensitive material is irradiated by a light source with an energy being equal to or greater than its band gap, electrons (e-) transition occurs from the valence band to the conduction band, leaving a hole (h+), at the same time, the generated electron-hole …

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Structure Analysis Of Pemfc Cathode Catalyst Layer, Rui-Qing Wang, Sheng Sui Dec 2021

Structure Analysis Of Pemfc Cathode Catalyst Layer, Rui-Qing Wang, Sheng Sui

Journal of Electrochemistry

The sluggish oxygen reduction reaction (ORR) on the cathode of the proton exchange membrane fuel cell (PEMFC) has always been one of the key factors limiting its commercialization. The optimization of the cathode catalytic layer structure plays an important role in improving fuel cell performance and reducing production costs. In this paper, two different catalysts (platinum nanoparticles (Pt-NPs) and platinum nanowires (Pt-NWs)) were prepared by using catalyst coated substrate (CCS) method. By constructing a double-layer catalytic layer structure, we analyzed the effect of different catalytic layer structures by performing a single cell test. The results showed that the dense platinum …

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Cyclic Voltammetric Simulations On Batteries With Porous Electrodes, Xue-Fan Cai, Sheng Sun Dec 2021

Cyclic Voltammetric Simulations On Batteries With Porous Electrodes, Xue-Fan Cai, Sheng Sun

Journal of Electrochemistry

Lithium-ion batteries (LIBs) are among the most widely used energy storage devices. Whole-cell modeling and simulations of LIBs can optimize the design of batteries with lower costs and higher speeds. The Pseudo-Two-Dimensional (P2D) electrochemical model is among the most famous whole-cell models and widely applied in LIB simulations. P2D model consists of a series of kinetic equations to model Li+/Li diffusion in working/counter electrodes and electrolytes, which are filled in the porous electrodes and separator, and reactions at the interface of electrolyte and active particles. The traditional applications of P2D model, however, are limited to the cases where …

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Effect Of Aluminum Alloy Surface Modification On Adhesion Of The Modified Polyurethane Coating And Its Corrosion Protective Performance, Xian-Yin Kuang, Shao-Qiang Jin, Yan-Hui Cao, Yan-Mei Zhang, Shi-Gang Dong, Long-Hui Zhu, Li-Wen Lin, Chang-Jian Lin Dec 2021

Effect Of Aluminum Alloy Surface Modification On Adhesion Of The Modified Polyurethane Coating And Its Corrosion Protective Performance, Xian-Yin Kuang, Shao-Qiang Jin, Yan-Hui Cao, Yan-Mei Zhang, Shi-Gang Dong, Long-Hui Zhu, Li-Wen Lin, Chang-Jian Lin

Journal of Electrochemistry

The ordinary organic coatings on aluminum alloy usually encounter a problem of low adhesion to the substrate, which results in destruction and failure of the long-term protective performance of the anticorrosion systems. The surface modification of aluminum alloy is able to enhance the adhesion of organic coating on aluminum alloys, and to improve their protective performance. In this work, a combined surface modification of anodic oxidation and mussel adhesion protein/CeO2/3-aminopropyltriethoxysilane composite film (MCA) was developed on the aluminum alloy. The adhesion of modified polyurethane coated on the treated aluminum alloy and its corrosion protective performance were evaluated comprehensively …

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Functional Sulfate Electrolytes Enable The Enhanced Cycling Stability Of Nati2(Po4)3/C Anode Material For Aqueous Sodium-Ion Batteries, Shu-Jin Li, Zhi-Kang Cao, Wen-Kai Wang, Xiao-Han Zhang, Xing-De Xiang Dec 2021

Functional Sulfate Electrolytes Enable The Enhanced Cycling Stability Of Nati2(Po4)3/C Anode Material For Aqueous Sodium-Ion Batteries, Shu-Jin Li, Zhi-Kang Cao, Wen-Kai Wang, Xiao-Han Zhang, Xing-De Xiang

Journal of Electrochemistry

Aqueous sodium-ion batteries show promising application in fields of large-scale storage of intermittent renewable energies owing to the earth-abundant sodium resources and incombustible aqueous electrolytes. Primary factors determining whether they can be commercially utilized are low cost and long lifetime. Among current electrode materials, NASICON-type NaTi2(PO4)3 arouses wide interests as an anode material for aqueous sodium-ion batteries as it offers a high specific capacity, fast Na-transport ability and reasonable working potential, however, suffering from insufficient cycling performance caused by severe dissolution of active materials in traditional aqueous electrolytes. In this work, a functional sulfate electrolyte …

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Influence Of Heat Treatment Time On Cathode Material Cr8O21 For Lithium Battery, Jiu-Kang Teng, Qing-Jie Wang, Liang Zhang, Hong-Mei Zhang, Xiao-Tao Chen, Peng Zhang, Jin-Bao Zhao Dec 2021

Influence Of Heat Treatment Time On Cathode Material Cr8O21 For Lithium Battery, Jiu-Kang Teng, Qing-Jie Wang, Liang Zhang, Hong-Mei Zhang, Xiao-Tao Chen, Peng Zhang, Jin-Bao Zhao

Journal of Electrochemistry

Chromium oxide (Cr8O21) cathode material for lithium batteries was synthesized by thermal decomposition of chromium trioxide (CrO3) at high temperature. The electrochemical properties of chromium oxide depended on the time and temperature during the heat treatment. Pure phase chromium oxide was prepared, and the effects of heat treatment time on the structures and electrochemical properties of Cr8O21 were systematically studied. The first discharge mechanism of chromium oxide in lithium batteries was explored, and the results were similar to that in lithium-sulfur batteries. The crystal phases and electrochemical properties of the prepared …

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Effect Of Glycol Based Coolant Pollution On Pem Fuel Cells Stack And Recovery Measures, Cong-Yi Zhu, Xiao-Hui Li, Quan-Quan Gan Dec 2021

Effect Of Glycol Based Coolant Pollution On Pem Fuel Cells Stack And Recovery Measures, Cong-Yi Zhu, Xiao-Hui Li, Quan-Quan Gan

Journal of Electrochemistry

As the heat conduction medium of fuel cell cooling system, coolant is very important for the thermal management of fuel cell stack. In practical application, coolant leakage into the stack often occurs. Due to the randomness of fault location of components, the location of coolant leakage is uncertain, which may occur on the cathode side or anode side of some or all single cells. The main effects of coolant pollution on fuel cell stack are as follows: the output of open circuit voltage decreases sharply, the consistency of single cells voltage decreases and so on, which seriously affects the normal …

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Formation And Morphological Evolution Of Nanoporous Anodized Iron Oxide Films, Jin-Wei Cao, Nan Gao, Zhao-Qing Gao, Chen Wang, Sheng-Yan Shang, Yun-Peng Wang, Hai-Tao Ma Dec 2021

Formation And Morphological Evolution Of Nanoporous Anodized Iron Oxide Films, Jin-Wei Cao, Nan Gao, Zhao-Qing Gao, Chen Wang, Sheng-Yan Shang, Yun-Peng Wang, Hai-Tao Ma

Journal of Electrochemistry

The preparation of iron oxide films with nanoporous structure by anodization has attracted much attention for its potential applications. However, the formation mechanism of porous structure during anodization is still unclear. In this paper, the composition of anodic current during the formation of nanoporous anodized iron oxide film was analyzed in combination with the current density-potential response (I-V curve) and the derivation of Faraday’s law. The results showed that the anodic current consisted of an ionic current (leading to the migration of ions to form oxide) and an electronic current (leading to the oxygen evolution), and the …

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Copper Nanoparticles In-Situ Anchored On Nitrogen-Doped Carbon For High-Efficiency Oxygen Reduction Reaction Electrocatalyst, Hui-Fang Yuan, Yue Zhang, Xing-Wu Zhai, Li-Bing Hu, Gui-Xian Ge, Gang Wang, Feng Yu, Bin Dai Dec 2021

Copper Nanoparticles In-Situ Anchored On Nitrogen-Doped Carbon For High-Efficiency Oxygen Reduction Reaction Electrocatalyst, Hui-Fang Yuan, Yue Zhang, Xing-Wu Zhai, Li-Bing Hu, Gui-Xian Ge, Gang Wang, Feng Yu, Bin Dai

Journal of Electrochemistry

Compared with noble metal platinum (Pt)-based catalysts, inexpensive non-noble metal electrocatalysts have attracted extensive attention for oxygen reduction reaction (ORR). Herein, chitosan as a kind of biomass resource rich in nitrogen and carbon was used to prepare nitrogen-doped carbon (N-C) and N-C in-situ anchored by copper nanoparticles (Cu/N-C). The as-obtained N-C and Cu/N-C nanoparticles were successfully used as non-noble eletrocatalysts tested for ORR. Compared with the N-C, the Cu/N-C showed the high surface area of 607.3 m 2·g-1 with the mean pore size of 2.5 nm and the pore volume of 0.40 cm3·g-1 …

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Mathematical Model Of The Efficiency Of Investments Aimed In The Implementation Of Water-Saving Technologies Dec 2021

Mathematical Model Of The Efficiency Of Investments Aimed In The Implementation Of Water-Saving Technologies

Irrigation and Melioration

In Uzbekistan, research work is being carried out aimed at improving the economic mechanisms for the introduction of water-saving technologies for irrigating agricultural crops. At the same time, the issues related to the analysis of the effectiveness of the use of water-saving technologies when irrigating cotton, the development of mathematical methods for assessing the effectiveness of investments, as well as their introduction into practice have not been sufficiently studied. This article provides a mathematical model of the efficiency of investments aimed at introducing water-saving technologies. The results of a numerical experiment of a mathematical model show that the introduction of …

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