Open Access. Powered by Scholars. Published by Universities.®

Engineering Science and Materials Commons™

Open Access. Powered by Scholars. Published by Universities.®

Chulalongkorn University

Discipline
Keyword
Publication Year
Publication
Publication Type

Articles 271 - 300 of 502

Full-Text Articles in Engineering Science and Materials

Physico-Chemical Characterization Of Snail Shells Powder Prepared By Mechanochemical Processes And Thermal Treatment, Mostapha Karaoui, Rachid Hsissou, Mohammed Alami, Mohammed Assouag Jan 2023

Physico-Chemical Characterization Of Snail Shells Powder Prepared By Mechanochemical Processes And Thermal Treatment, Mostapha Karaoui, Rachid Hsissou, Mohammed Alami, Mohammed Assouag

Journal of Metals, Materials and Minerals

Natural particles are the most abundant resources exist in nature. Bio-sources of CaCO3 particles have attracted the attention of researchers for multiple cosmetics, industrial, and medical applications. This work investigates the structural evolution of CaCO3 containing in snail shell particles prepared by a mechanochemical process using methods of characterization as well as Differential scanning calorimeter (DSC), Thermogravimetric analysis (TGA), X-ray diffraction (X-RD), Fourier transformation infra-red (FT-IR), and Scanning microscopy equipped with Energy-dispersive X-Ray spectroscopy (SEM-EDXS). The result obtained from the above analysis indicates that SSP calcined between 200℃ to 400℃ undergoes an elimination of water molecules, followed by a phase …

Go to article

Recycling Of Iron Oxide Waste By Carbothermic Reduction To Utilize In Fdm 3d Printing Materials, Korbkaroon Doungkeaw, Peeraphat Suttipong, Phachai Kungwankrai, Suksan Muengto, Boonlom Thavornyutikarn, Jennarong Tungtrongpairoj Jan 2023

Recycling Of Iron Oxide Waste By Carbothermic Reduction To Utilize In Fdm 3d Printing Materials, Korbkaroon Doungkeaw, Peeraphat Suttipong, Phachai Kungwankrai, Suksan Muengto, Boonlom Thavornyutikarn, Jennarong Tungtrongpairoj

Journal of Metals, Materials and Minerals

Iron oxide scale generally forms on low-carbon steel surfaces during the hot rolling processes and produces as solid waste more than 100 thousand tons per year. The utilization of the iron oxide scale is one possible way to reduce the production cost for steel plants and promote environmental protection. Acrylonitrile-Butadiene-Styrol-Copolymer (ABS) is widely used as engineering plastic for automotive parts because of its high strength and wear resistance. The recycling of iron oxide waste as reinforcement particles for enhancing the tensile strength of ABS composite was studied. The iron oxides were recycled by carbon powder at a high temperature between …

Go to article

Eddy Current Evaluation For Thickness Loss Estimation Of Aluminum Alloys Used In Aircraft Structures, Seekharin Komonhirun, Sujittra Tangprakob, Sorawit Chanaphan, Awika Jaroensri, Thanasak Nilsonthi, Thammaporn Thublaor Jan 2023

Eddy Current Evaluation For Thickness Loss Estimation Of Aluminum Alloys Used In Aircraft Structures, Seekharin Komonhirun, Sujittra Tangprakob, Sorawit Chanaphan, Awika Jaroensri, Thanasak Nilsonthi, Thammaporn Thublaor

Journal of Metals, Materials and Minerals

Aluminum alloys are commonly used in the aircraft industry but it tends to corrode and needs to be inspected properly. Eddy current testing is the widely used non-destructive testing (NDT) for aircraft metals. This research studied estimating the thickness loss due to corrosion in an aircraft aluminum sheet metal. The Al1100, Al2024, and Al7075 were 2 mm thick. Aluminum sheet metals were used to create artificial damage in hydrochloric acid. The thickness loss due to corrosion was inspected with eddy current testing (ET) and compared with the measurement from the coordinate measurement machine (CMM). The results showed that the thickness …

Go to article

Fabrication And Characterizations Of High Density Si3 N4 - Zro2 Ceramics, Kamol Traipanya, Thanakorn Wasanapiarnpong, Charusporn Mongkolkachit Jan 2023

Fabrication And Characterizations Of High Density Si3 N4 - Zro2 Ceramics, Kamol Traipanya, Thanakorn Wasanapiarnpong, Charusporn Mongkolkachit

Journal of Metals, Materials and Minerals

Silicon nitride and zirconia were mixed with SiO2, MgO, Y2O3 as sintering additives and pressureless sintered at 1650℃ in N2 atmosphere for 2 h. The XRD results showed a-Si3N4 was partially transformed to b-Si3N4 with 3:3:5 weight ratio of SiO2 : MgO : Y2O3. However, at 5 wt% of ZrO2 addition promoted phase transformation of a-Si3N4 to b-Si3N4 while 35 wt% of ZrO2 completely transformed to b-Si3N4 phase. Si3N4 has a lower density than ZrO2, bulk density of samples increases in correlation with the amount of ZrO2. Because there was no difference in hardness and flexural strength between sintered Si3N4 …

Go to article

Enhancing The Color Shade And Depth Of Linen Fabrics Dyed With Caesalpinia Sappan L. Wood Extract Using Metallic Salt Mordants, Thanika Hutakamol, Penwisa Pisitsak, Sarida Thongmee, Sinuntorn Srijanand, Thankamol Somrus Jan 2023

Enhancing The Color Shade And Depth Of Linen Fabrics Dyed With Caesalpinia Sappan L. Wood Extract Using Metallic Salt Mordants, Thanika Hutakamol, Penwisa Pisitsak, Sarida Thongmee, Sinuntorn Srijanand, Thankamol Somrus

Journal of Metals, Materials and Minerals

This study demonstrated natural dyeing of linen with a dye extracted from sappan wood (Caesalpinia sappan L.). Four metallic salt mordants, namely (NH4)2Fe(SO4)2, CuSO4, SnCl2, and AlK(SO4)2, referred to as Fe, Cu, Sn, and Al, respectively, were used to improve the dyeing properties. The influences of the pH, dye concentration, mordant type and concentration, and mordanting technique on the dyeing properties were investigated. Dyeing without mordants resulted in a reddish-brown fabric; however, different mordants produced a variety of color shades. In general, the mordant containing Fe yielded the highest color strength, generating a dark gray color very close to black. …

Go to article

Enhanced Raman Spectroscopy Analysis For Contamination Detection On Microelectronic Devices Using Gold Nanoclusters Grown By Dc Magnetron Sputtering, Charin Seesomdee, Prompong Pienpinijtham, Pornchai Rakpongsiri, Sukkaneste Tungasmita Jan 2023

Enhanced Raman Spectroscopy Analysis For Contamination Detection On Microelectronic Devices Using Gold Nanoclusters Grown By Dc Magnetron Sputtering, Charin Seesomdee, Prompong Pienpinijtham, Pornchai Rakpongsiri, Sukkaneste Tungasmita

Journal of Metals, Materials and Minerals

Surface-enhanced Raman spectroscopy (SERS) is one of the most powerful analytical techniques for the identification of molecules in microelectronics industry for failure analysis protocols.  Surface-enhanced Raman spectroscopy (SERS) is one of the most powerful analytical techniques for the identification of molecules in the microelectronics industry for failure analysis protocols. In this work, dry-processed gold nanoclusters were prepared by magnetron sputtering deposition to promote the enhancement of the Raman signal from selected common polymers found in the hard disk drive as surface contamination. The optimized sputtering conditions were applied for SERS on poly-carbonate (PC), polyethylene terephthalate (PET), polypropylene (PP), and high-density …

Go to article

Cellulose-Based Fabrics Triboelectric Nanogenerator: Effect Of Fabric Microstructure On Its Electrical Output, Rawiwan Khwanming, Satana Pongampai, Naratip Vittayakorn, Thitirat Charoonsuk Jan 2023

Cellulose-Based Fabrics Triboelectric Nanogenerator: Effect Of Fabric Microstructure On Its Electrical Output, Rawiwan Khwanming, Satana Pongampai, Naratip Vittayakorn, Thitirat Charoonsuk

Journal of Metals, Materials and Minerals

At present, fabric-based triboelectric nanogenerator (TENG) has been paid attention and developed for self-power generation systems with wearability for E-textiles, especially cotton. However, there are many commercial cellulose-based fabrics with different fiber characteristics and fabric structures that gain possibility to effect on TENG performance and has been underreported. This work presents the fabrication of the textile TENG by using four types of commercial cellulose-based fabrics as friction layer and compare the electrical output efficiency relating their molecular structure, fabric structure and surface morphology characteristics. As shown by the electrical output, though all fabrics can generate electricity for TENG device, nevertheless, …

Go to article

Biomass-Based Nitrogen-Doped Carbon/Polyaniline Composite As Electrode Material For Supercapacitor Devices, Krittaprot Thongkam, Nattawut Chaiyut, Manop Panapoy, Bussarin Ksapabutr Jan 2023

Biomass-Based Nitrogen-Doped Carbon/Polyaniline Composite As Electrode Material For Supercapacitor Devices, Krittaprot Thongkam, Nattawut Chaiyut, Manop Panapoy, Bussarin Ksapabutr

Journal of Metals, Materials and Minerals

Nitrogen-doped activated carbon (N-AC) was prepared from water hyacinth stems for loading polyaniline (PANI) by in-situ polymerization to synthesize N-AC/PANI composites for utilization as electrode materials in supercapacitors. Using potassium hydroxide as the activating agent, stems of water hyacinth were carbonized and activated in a single step to produce N-AC powders. Raman, FTIR, SEM, BET, TGA, and XPS techniques were used to characterize the resultant N-AC materials. The findings revealed that the N-AC materials had a porous structure and high specific surface area. Neat PANI was synthesized by varying the reaction time to 8, 16, and 24 h. During the …

Go to article

Influence Of Water Content On Structural And Electrochromic Properties Of Tio2 Nanotube Prepared By Anodization, Chantana Aiempanakit, Pathomporn Junbang, Watchara Suphap, Kamon Aiempanakit Jan 2023

Influence Of Water Content On Structural And Electrochromic Properties Of Tio2 Nanotube Prepared By Anodization, Chantana Aiempanakit, Pathomporn Junbang, Watchara Suphap, Kamon Aiempanakit

Journal of Metals, Materials and Minerals

TiO2 nanotubes (TNTs) and bamboo-type TNTs structure films were synthesized via anodization from sputtered titanium (Ti) films on indium tin oxide (ITO) glass. Herein, the anodization process was adjusted electrolyte with different amounts of deionized water and ethylene glycol. The optical and structural properties of all films before and after annealing were investigated, which affected electrochromic application. The increasing deionized water content in electrolytes resulted in an increase in the average diameter and a decrease in the average length of TNTs. Furthermore, the bamboo-type TNTs structure was produced at the deionized water volume condition of 3 vol%. The crystallite size …

Go to article

Color Shading, Color Fastness, Antibacterial And Ultraviolet Protection Properties Of Silk Fabric Colored By Silver Nanoparticles, Siriwan Kittinaovarat, Pornchiwin Banjong, Pornapa Sujaridworakun Jan 2023

Color Shading, Color Fastness, Antibacterial And Ultraviolet Protection Properties Of Silk Fabric Colored By Silver Nanoparticles, Siriwan Kittinaovarat, Pornchiwin Banjong, Pornapa Sujaridworakun

Journal of Metals, Materials and Minerals

This research studied the effects of different factors used in an in-situ method for forming colored silver nanoparticles (AgNP) on the properties of silk fabric; namely color shading, color strength, relative unlevelness index, color fastness to washing, antibacterial and UV shielding properties. In addition, improvement with an acrylic binder on color fastness to washing and antibacterial property after 20 cycles of washing of AgNP-treated silk fabric were also investigated. It was found that the optimum condition for treatment by the in-situ method was 2.0% owf of silver nitrate (AgNO3) solution, AgNO3 to trisodium citrate ratio at 1:3 (%w/w), exhaustion temperature …

Go to article

Effect Of Trisilanol Isobutyl Polyhedral Oligomeric Silsesquioxane (Tposs) In Recycled Pet (Rpet) And Polypropylene Based Compound: Investigation On Mechanical Properties, Rujira Phumma, Chutima Vanichvattanadecha, Sarute Ummartyotin Jan 2023

Effect Of Trisilanol Isobutyl Polyhedral Oligomeric Silsesquioxane (Tposs) In Recycled Pet (Rpet) And Polypropylene Based Compound: Investigation On Mechanical Properties, Rujira Phumma, Chutima Vanichvattanadecha, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

Recycled polyethylene terephthalate is successfully prepared. This project is involved for “Circular economy” policy. It is successfully prepared into powder form by nano-grinder technique. 10 phr of PP-g-MA and 1 phr to 5 phr of TPOSS are added for compatibilizer and mechanical properties enhancement, respectively. PP-g-MA can form the chemical linkage of the anhydride groups with the polyamide end groups. 20 wt% of recycled polyethylene terephthalate powder and polypropylene based compound is successfully fabricated by melt mixing. Then, it is fabricated by melting spinning technique. Fourier transform infrared presents Si-O-Si linkage in binary blend compound. X-ray diffraction pattern reports that …

Go to article

Preparation Of Ga2o3-Modified Sulfated Zirconia Mesopore And Its Application On Cellobiose Hydrolysis, Addy Rachmat, Rizki Dwifahmi, Nova Yuliasari, Ady Mara, Desnelli Desnelli Jan 2023

Preparation Of Ga2o3-Modified Sulfated Zirconia Mesopore And Its Application On Cellobiose Hydrolysis, Addy Rachmat, Rizki Dwifahmi, Nova Yuliasari, Ady Mara, Desnelli Desnelli

Journal of Metals, Materials and Minerals

Heterogeneous catalyst plays vital role in biomass processing due to slow rate of biological and naturally pathway processes. Solid acid sulfated zirconia (SZ) is a promising catalyst with properties that can be tuned up. Sulfated zirconia was successfully modified by 2%, 5% and 10% (wt.) Ga2O3 (xGa-SZ; x = 2, 5 and 10) via template-assisted sol-gel method. The catalysts were characterized through various method (XRD, SEM-EDS and Gas Sorption analysis) and applied on hydrolysis of cellobiose, a model compound of cellulose. Diffraction pattern showed xGa-SZ formed completely tetragonal phase whereas un-promoted SZ contains mixed phase of monoclinic and tetragonal. Acidity …

Go to article

The Changes In Microstructural Features And Physical Properties Of Ceramic Matrix Composite Bonding Tools Under Ultrasonic Service, Apirat Theerapapvisetpong, Karn Serivalsatit, Wuttichai Reainthippayasakul, Wantanee Buggakupta Jan 2023

The Changes In Microstructural Features And Physical Properties Of Ceramic Matrix Composite Bonding Tools Under Ultrasonic Service, Apirat Theerapapvisetpong, Karn Serivalsatit, Wuttichai Reainthippayasakul, Wantanee Buggakupta

Journal of Metals, Materials and Minerals

Tape automated bonding (TAB) process plays a key role in the production of disk drives, microchips and other microelectronics components. Such tools should sustain their structures and properties throughout ultrasonic operation and are expected to last until reaching the targeted numbers of TAB cycles. This project aims to evaluate the changes in microstructures and physical properties of the bonding tools under ultrasonic service. Three commercial waffle-type tools from different suppliers were focused, namely Tool A, Tool B and Tool C. They provide different levels of bonding efficiency up to 50k cycles under relatively similar ultrasonic practice. Non-destructive and destructive testing …

Go to article

Synthesis Of Sic Nanowires On Biochar Surfaces By A Simple Direct Method, Wasana Khongwong, Chumphol Busabok, Piyalak Ngernchuklin Jan 2023

Synthesis Of Sic Nanowires On Biochar Surfaces By A Simple Direct Method, Wasana Khongwong, Chumphol Busabok, Piyalak Ngernchuklin

Journal of Metals, Materials and Minerals

Demand for air filters is crucially required due to PM 2.5. So, SiC nanowire networks are directly grown on biochar surfaces that serve strength and filtering purposes. The nanowires were prepared by spraying silicon powder on Lesser bulrush and Grey sedge biochars which acted as carbon sources and heating up to 1300℃ to 1500℃ for 1 h in Ar atmosphere. As a result, silicon powder evaporated and diffused on biochar surfaces. Meanwhile, CO vapor was generated from biochar reacted with O2 in the chamber. The evaporated silicon reacted with both C(s) and CO(g) to form cubic SiC nanowires. At the …

Go to article

Growth Of Proton Conducting Strontium Cerate Composites, C. K. Shilpa, S. V. Jasira, V. P. Veena, K. M. Nissamudeen Jan 2023

Growth Of Proton Conducting Strontium Cerate Composites, C. K. Shilpa, S. V. Jasira, V. P. Veena, K. M. Nissamudeen

Journal of Metals, Materials and Minerals

The increased population and modern way of life have greatly depleted the effectiveness of traditional energy production methods. There is a strong demand for environmentally friendly and renewable alternatives to replace the old systems. Sustainable energy production systems have emerged as a vital replacement for the conventional use of fossil fuels. Among these, solid oxide fuel cells (SOFCs) play a significant role. Recently, researchers have developed electrolyte components for SOFCs using proton-conducting perovskites with excellent conductivity. This critical assessment presents a yearly overview of innovative strategies for utilizing doped strontium cerate perovskites in energy production systems, a novel approach. The …

Go to article

Review Of Materials, Functional Components, Fabrication Technologies And Assembling Characteristics For Polymer Electrolyte Membrane Fuel Cells (Pemfcs) – An Update, Arun Daya, Arputharaj Samson Nesaraj Jan 2023

Review Of Materials, Functional Components, Fabrication Technologies And Assembling Characteristics For Polymer Electrolyte Membrane Fuel Cells (Pemfcs) – An Update, Arun Daya, Arputharaj Samson Nesaraj

Journal of Metals, Materials and Minerals

Fuel cells use electrochemical processes to transform the chemical energy of a fuel into electrical energy, which is a key enabler for the shift to an H2-based economy. Because of their high energy conversion efficiency and low pollution emissions, fuel cells with polymer electrolyte membranes (PEMFCs) are regarded as being in frontline of commercialization for the transportation and automotive industries. However, there are two major hurdles to their future commercialization: cost and durability, which promote basic study and development of their components. In this article, we reviewed the materials, functional components, fabrication technologies and assembling characteristics related to PEMFCs. Platinum's …

Go to article

Structure And Chemical Durability Improvement Of Alkali Silicate Glass By Zirconium Dioxide And Erbium Oxide Addition, Ativit Denprawat, Kittipong Sinwanasarp, Pinit Kidkhunthod, Nattapol Laorodphan, Worapong Thiemsorn Jan 2023

Structure And Chemical Durability Improvement Of Alkali Silicate Glass By Zirconium Dioxide And Erbium Oxide Addition, Ativit Denprawat, Kittipong Sinwanasarp, Pinit Kidkhunthod, Nattapol Laorodphan, Worapong Thiemsorn

Journal of Metals, Materials and Minerals

Glass structure tailoring of alkali silicate glasses by addition of ZrO2 and Er2O3 is found to enhance the chemical durability of glasses. ZrO2 (x ranged between 5 mol% to 15 mol%) and Er2O3 (y ranged between 0.5 mol% to 1.5 mol%) were used to replace SiO2 and Na2O, respectively, in the glasses with the nominal composition of 10Li2O-(15-y)Na2O-10CaO-(65-x)SiO2-xZrO2-y Er2O3. The samples were prepared by conventional melt quenching technique. The structures of produced glasses were examined by X-ray absorption spectroscopy (XAS) and Raman spectroscopy. XAS spectra demonstrated that the oxidation numbers of Zr and Er ions were +4 and +3, respectively. …

Go to article

Quantum-Based First-Principles Study Of Gas Molecules (O2 , Co2 , No2 ) Interaction On Monolayer Germanene, Arief Hermanto, Harmon Prayogi, Ari Dwi Nugraheni, Juliasih Partini, Sholihun Sholihun Jan 2023

Quantum-Based First-Principles Study Of Gas Molecules (O2 , Co2 , No2 ) Interaction On Monolayer Germanene, Arief Hermanto, Harmon Prayogi, Ari Dwi Nugraheni, Juliasih Partini, Sholihun Sholihun

Journal of Metals, Materials and Minerals

We perform calculations of the adsorption energy of O2, CO2, and NO2 molecules on germanene by using the density functional theory (DFT). We find two favorable configurations for O2, the U-site and V-site configurations with similar adsorption energies of -4.10 and -4.32 eV. As for NO2, we find two favorable configurations, the T-site and DB-site configurations. The T-site configuration is 0.98 eV more stable than the IB-site one, and both configurations are chemically adsorbed by germanene. On the contrary for CO2, we find a T-site configuration with adsorption energy of 0.42 eV and the configuration physically adsorbed by germanene.

Go to article

Synthesis And Modification Of Nickel Hydroxide Particle Synthesized By Self-Assembly And Electron Beam Irradiation Technique For Photocatalyst Activity, Narisara Saechin, Sumitra Sripho, Thitirat Rattanawongwiboon, Sakchai Laksee, Pattra Lertsarawut, Wilasinee Kingkam, Sarute Ummartyotin Jan 2023

Synthesis And Modification Of Nickel Hydroxide Particle Synthesized By Self-Assembly And Electron Beam Irradiation Technique For Photocatalyst Activity, Narisara Saechin, Sumitra Sripho, Thitirat Rattanawongwiboon, Sakchai Laksee, Pattra Lertsarawut, Wilasinee Kingkam, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

The purpose of this work is to study the methyl orange removal of Ni(OH)2 nanoparticles. The photo-catalyst activity is investigated based on UV lamp of 18 watt. Ni(OH)2 is synthesized by a self-assembly process and then exposed to electron beam radiation at 10 MeV energy with various doses ranging from 50 kGy to 500 kGy. The properties of Ni(OH)2 nanoparticles are then evaluated. No significant change of functional group and percent of crystallinity are observed. The morphology is uniformly presented as a plate-like. The specific surface area, pore size and pore volume are reduced. Point of zero charge confirmed that …

Go to article

Effect Of Calcination Frequency On The Thermoelectric Properties Of Ti Doped Cucro By Solid State Method, Doli Bonardo, Nono Darsono, Syahrul Humaidi, Agung Imaduddin, Noni Surtiana Silalahi Jan 2023

Effect Of Calcination Frequency On The Thermoelectric Properties Of Ti Doped Cucro By Solid State Method, Doli Bonardo, Nono Darsono, Syahrul Humaidi, Agung Imaduddin, Noni Surtiana Silalahi

Journal of Metals, Materials and Minerals

In this study, the influence of titanium oxide (TiO2) dopants and varying calcination processes on the thermoelectric properties of CuCrO2 was systematically explored. It was emphasized that these factors were not only affecting dislocation density but also exerting a profound influence on thermoelectric performance through the modulation of Seebeck coefficient and resistivity. The findings highlighted CrT-2, which incorporated TiO2 and underwent a two-time calcination process, as the top-performing sample in terms of power factor values, underscoring the significance of TiO2 as a dopant for enhancing thermoelectric efficiency. Conversely, Cr-4, exposed to four calcination cycles, exhibited slightly lower power factor values …

Go to article

Electrical And Water Resistance Properties Of Conductive Paste Based On Gold/Silver Composites, Sutthipoj Wongrerkdee, Supab Choopun, Pichitchai Pimpang Jan 2023

Electrical And Water Resistance Properties Of Conductive Paste Based On Gold/Silver Composites, Sutthipoj Wongrerkdee, Supab Choopun, Pichitchai Pimpang

Journal of Metals, Materials and Minerals

This study aimed to investigate the effects of a corrosive environment on both the electrical and the water resistance properties of conductive paste based on gold/silver composites. The conductive paste was prepared by incorporating silver and gold powders, polyvinyl acetate, polyvinyl chloride as adhesive components, and methyl isobutyl ketone as a diluent. The gold/silver composite powder was prepared with different mass ratios of gold and silver. The paste was coated on a substrate and heated at 80℃ to form the conductive paste film. Characterizations of conductive paste were performed by using FT-IR spectroscopy, electrometry, cyclic voltammetry, and contact angle measurements. …

Go to article

Molybdenum Disulfide-Zirconium Dioxide Composite With Enhance Supercapacitance Performance, Razan Nadhim Shaker, Sami Mohammed, Yousra Ali Abdulsayed Jan 2023

Molybdenum Disulfide-Zirconium Dioxide Composite With Enhance Supercapacitance Performance, Razan Nadhim Shaker, Sami Mohammed, Yousra Ali Abdulsayed

Journal of Metals, Materials and Minerals

As a supercapacitor active material, molybdenum disulfide (MoS2) layer offers good conductivity, large surface area, and electrochemical stability. In practice, however, its capacitance is low in comparison to other materials. This work synthesized MoS2-zirconium dioxide (ZrO2) composite in a simple, high-throughput way to test it as a supercapacitor active layer. During the tests, the composite shows a gravimetric capacitance of 500.0 F⸳g-1, while MoS2 and ZrO2 have capacitances of 265.12 and 152.43, respectively. The increase in capacitance of composite stems from the synergistic effect between ZrO2's pseudocapacitor behavior and MoS2's electric double layer capacitance (EDLC). Moreover, the composite has a …

Go to article

Evaluation Of Static Recrystallization And Grain Growth Kinetics Of Hot-Rolled Az31 Alloy, Salaheddine Sadi, Abdelkader Hanna, Thierr Baudin, Anne-Laure Helbert, François Brisset, Djamel Bradai, Hiba Azzeddine Jan 2022

Evaluation Of Static Recrystallization And Grain Growth Kinetics Of Hot-Rolled Az31 Alloy, Salaheddine Sadi, Abdelkader Hanna, Thierr Baudin, Anne-Laure Helbert, François Brisset, Djamel Bradai, Hiba Azzeddine

Journal of Metals, Materials and Minerals

The static recrystallization/grain growth kinetics of the AZ31 (Mg-3Al-1Zn, wt%) alloy were investigated employing Vickers microhardness and electron backscatter diffraction (EBSD) measurements. The AZ31 alloy was subject to a hot-rolling for 70% of thickness reduction and then annealed at various temperatures (150°C, 250°C, and 350°C) from 5 min to 24 h. First, the static recrystallization kinetics were analysed by means of the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. The results showed that the recrystallization occurred under two regimes both involving their own Avrami exponent/ activation energy. In regime I, the Avrami exponent was found in the range of 1.5-0.35 depending on the annealing …

Go to article

Effect Of Al Addition On Crystal Structure Of Algan/Gan On Gaas (001) Substrate Grown By Metalorganic Vapor Phase Epitaxy, Nattamon Suwannaharn, Sakuntam Sanorpim, Suphakan Kijamnajsuk, Visittapong Yordsri, Noppadon Nuntawong, Kentaro Onabe Jan 2022

Effect Of Al Addition On Crystal Structure Of Algan/Gan On Gaas (001) Substrate Grown By Metalorganic Vapor Phase Epitaxy, Nattamon Suwannaharn, Sakuntam Sanorpim, Suphakan Kijamnajsuk, Visittapong Yordsri, Noppadon Nuntawong, Kentaro Onabe

Journal of Metals, Materials and Minerals

Effects of Al addition on a structural phase modification in AlGaN/GaN films on GaAs  substrate grown by MOVPE have been investigated. To examine the effect of Al addition, AlGaN/GaN films were grown with varied a molar flow ratio of TMAl to the total group-III elements of 0, 0.15, and 0.30. Quantity of hexagonal phase incorporation was evaluated by the ratios of integrated XRD intensity of hexagonal  plane to cubic  plane from reciprocal space mappings. The diffraction geometry factor was considered in the calculation. The results suggest that GaN primarily contains a hexagonal phase with a small fraction of a cubic …

Go to article

Facile Synthesis Of Heterostructured G-C3n4/Ag -Tio2 Photocatalysts With Enhanced Visible-Light Photocatalytic Performance, Chonnipha Tangwongputti, Prasert Reubroycharoen, Pornapa Sujaridworakun Jan 2022

Facile Synthesis Of Heterostructured G-C3n4/Ag -Tio2 Photocatalysts With Enhanced Visible-Light Photocatalytic Performance, Chonnipha Tangwongputti, Prasert Reubroycharoen, Pornapa Sujaridworakun

Journal of Metals, Materials and Minerals

In this study, the g-C3N4/Ag-TiO2 composite photocatalysts were prepared to enhance the efficient utilization of solar energy. The g-C3N4 was synthesized by facile heat treatment of urea at 600℃ for 4 h, and 0.05 wt% to 3 wt% Ag-TiO2 were obtained through the chemical reduction method. The composite photocatalysts were prepared by mixing the g-C3N4 and Ag-TiO2 with a weight ratio of 50:50 at room temperature. The photocatalytic efficiency was carried out by using 0.05 g of photocatalysts with 10 mg·L-1 of rhodamine B 120 mL under 60 min of visible light irradiation. The experimental results indicated that a sample …

Go to article

Effect Of Pre-Carbonization Temperature On The Porous Structure And Electrochemical Properties Of Activated Carbon Fibers Derived From Kapok For Supercapacitor Applications, Nu Myat Thazin, Nattapat Chaiammart, Myo Myo Thu, Gasidit Panomsuwan Jan 2022

Effect Of Pre-Carbonization Temperature On The Porous Structure And Electrochemical Properties Of Activated Carbon Fibers Derived From Kapok For Supercapacitor Applications, Nu Myat Thazin, Nattapat Chaiammart, Myo Myo Thu, Gasidit Panomsuwan

Journal of Metals, Materials and Minerals

Activated carbon fibers (ACFs) were successfully synthesized from kapok via a two-step process: (i) pre-carbonization and (ii) chemical activation. The pre-carbonization temperature was varied at 300℃, 400℃, and 500℃. The mixing ratio of the pre-carbonized product and potassium hydroxide (KOH) was 3:1, while the activation temperature was 800℃. The effect of pre-carbonization temperature on the morphology, surface area and porosity, chemical functional group, and phase structure of ACFs was investigated and discussed. The characterization results showed that ACFs exhibited an amorphous carbon structure with a hollow fiber shape resembling the kapok. The specific surface area decreased from 487 m2×g-1 to …

Go to article

Effects Of Milling Time On Sintering Properties And Formation Of Interface Al4c3 On Graphite Reinforced Al-4.5cu-1.5mg Nanocomposite, Angga Khairul Fahmi, Haris Rudianto, Agus Sukarto Wismogroho, Wahyu Bambang Widayatno, Didik Aryanto, Bambang Hermanto Jan 2022

Effects Of Milling Time On Sintering Properties And Formation Of Interface Al4c3 On Graphite Reinforced Al-4.5cu-1.5mg Nanocomposite, Angga Khairul Fahmi, Haris Rudianto, Agus Sukarto Wismogroho, Wahyu Bambang Widayatno, Didik Aryanto, Bambang Hermanto

Journal of Metals, Materials and Minerals

Aluminum-based metal matrix nanocomposites have been extensively researched and developed for aerospace and automotive applications. Al-4.5Cu-1.5Mg with 0.5 wt% graphite were milled for 2 h, 4 h, 6 h, and 8 h using shaker mill under argon gas. The phenomena of deformation, fracturing, and cold welding during shaker mill were investigated to observe how the shaker mill effects on their morphology and formation of intermetallic phases due to its very high speed. Sintering under ultra-high purity argon gas for 99.9999% was done to produce high density materials. Intermetallic phase Al4C3 was found as a result reaction between aluminum and graphite …

Go to article

Influence Of Six-Step Heat Treatment On Microstructures And Mechanical Properties Of 5160 Alloy Steel, Pattama Apichai Jan 2022

Influence Of Six-Step Heat Treatment On Microstructures And Mechanical Properties Of 5160 Alloy Steel, Pattama Apichai

Journal of Metals, Materials and Minerals

AISI 5160 alloy steel grade with complete martensite structure to get the high-strength steel sheets quenched at 900 (Q1), 870 (Q2), 840 (Q3) and 810°C (Q4), respectively and temped at 780°C (Q5) and 680°C (Q6), respectively. The results show ferrite and pearlite microstructural appeared in as-sheet conditions. The strengthening rarely increased with increasing heat treatment steps, while the percentage elongation gradually decreased. The hardness change was secure with that of strengthening for the quenched martensite. In contrast, differences between the initial martensite hardness were no noticeable changes. The Q4 hardening involved the peak hardness and maximum ultimate tensile strength due …

Go to article

Biodiesel Production From Waste Cooking Oil Using A New Heterogeneous Catalyst Sro Doped Cao Nanoparticles, Apisit Prokaewa, Siwaporn Meejoo Smith, Apanee Luengnaruemitchai, Mathi Kandiah, Supakorn Boonyuen Jan 2022

Biodiesel Production From Waste Cooking Oil Using A New Heterogeneous Catalyst Sro Doped Cao Nanoparticles, Apisit Prokaewa, Siwaporn Meejoo Smith, Apanee Luengnaruemitchai, Mathi Kandiah, Supakorn Boonyuen

Journal of Metals, Materials and Minerals

Biodiesel production from waste palm cooking oil (WPCO) was studied. Calcium oxide with a strontium ion additive (Sr-CaO) was employed as a catalyst in transesterification reaction of used palm oil with methanol. The Sr-CaO was synthesized by co-precipitation method between SrCl2 and Ca(NO3)2, then calcined at 900°C for 5 h. The catalyst was characterized by using thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM), and Fourier transform infrared spectrometer (FT-IR). The morphology and elements content of Sr and Ca in the catalyst were confirmed by SEM-EDX. The approximate catalyst diameter is 12.6±5.9 µm. The highest conversion was 99.33% …

Go to article

Study Of The Effect Of Ph, Conditioning And Flotation Time On The Flotation Efficiency Of Phosphate Ores By A Soybean Oil Collector, Zohra Farid, Mohamed Abdennouri, Noureddine Barka, Youness Jannani, M'Hamed Sadiq Jan 2022

Study Of The Effect Of Ph, Conditioning And Flotation Time On The Flotation Efficiency Of Phosphate Ores By A Soybean Oil Collector, Zohra Farid, Mohamed Abdennouri, Noureddine Barka, Youness Jannani, M'Hamed Sadiq

Journal of Metals, Materials and Minerals

The mid-low grade of phosphate ore, rich by the silicate and carbonate gangue minerals needs a special treatment using the flotation process. Where the collectors play a pivotal role. This study was conducted to enrich an untreated phosphate ore (without washing, desliming, hydrocycling, etc.), with an eco-friendly and economic collector based on soybean oil. Different analytical techniques such as UV-Visible, ATR-FTIR spectrometric and XRD were used in order to analyse and characterize the flotation products. The effects of the parameters, pulp pH, conditioning time and flotation time on gangue removal efficiency by flotation, were investigated. Flotation tests were applied for …

Go to article

First Prev Next Last