Feasibility Study Of Coconut Shell Biochar Production Using Community-Scale Biochar Kiln,
2023
Chulalongkorn University
Feasibility Study Of Coconut Shell Biochar Production Using Community-Scale Biochar Kiln, Uraiwan Pongsa, Pasuree Lumsakul, Orajit Jamesang, Prasan Saengkhiao, Phoometh Sangrayub, Wichai Pumchan
Journal of Metals, Materials and Minerals
The enormous coconut shell waste from local farmers and manufacturers has caused negative environmental and economic impacts in Thailand. A low-cost, small-scale pyrolysis kiln comprised of a cylindrical tank, gas circulating pipes, a kiln stand, and a manual drum lever was constructed and used to produce biochar from coconut shells in this study. The air intake and holding times for the biochar production process were varied. The biochar yield was 30.67% to 36.22%, or 4.6 kg to 5.4 kg per day per unit. The biochar porosity and fixed carbon content increased as the air intake and holding times were increased. …
Physico-Chemical Characterization Of Snail Shells Powder Prepared By Mechanochemical Processes And Thermal Treatment,
2023
Chulalongkorn University
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 …
Recycling Of Iron Oxide Waste By Carbothermic Reduction To Utilize In Fdm 3d Printing Materials,
2023
Chulalongkorn University
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 …
Eddy Current Evaluation For Thickness Loss Estimation Of Aluminum Alloys Used In Aircraft Structures,
2023
Chulalongkorn University
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 …
Fabrication And Characterizations Of High Density Si3 N4 - Zro2 Ceramics,
2023
Chulalongkorn University
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 …
Enhancing The Color Shade And Depth Of Linen Fabrics Dyed With Caesalpinia Sappan L. Wood Extract Using Metallic Salt Mordants,
2023
Chulalongkorn University
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. …
Enhanced Raman Spectroscopy Analysis For Contamination Detection On Microelectronic Devices Using Gold Nanoclusters Grown By Dc Magnetron Sputtering,
2023
Chulalongkorn University
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 …
Cellulose-Based Fabrics Triboelectric Nanogenerator: Effect Of Fabric Microstructure On Its Electrical Output,
2023
Chulalongkorn University
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, …
Biomass-Based Nitrogen-Doped Carbon/Polyaniline Composite As Electrode Material For Supercapacitor Devices,
2023
Chulalongkorn University
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 …
Influence Of Water Content On Structural And Electrochromic Properties Of Tio2 Nanotube Prepared By Anodization,
2023
Chulalongkorn University
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 …
Color Shading, Color Fastness, Antibacterial And Ultraviolet Protection Properties Of Silk Fabric Colored By Silver Nanoparticles,
2023
Chulalongkorn University
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 …
Effect Of Trisilanol Isobutyl Polyhedral Oligomeric Silsesquioxane (Tposs) In Recycled Pet (Rpet) And Polypropylene Based Compound: Investigation On Mechanical Properties,
2023
Chulalongkorn University
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 …
Preparation Of Ga2o3-Modified Sulfated Zirconia Mesopore And Its Application On Cellobiose Hydrolysis,
2023
Chulalongkorn University
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 …
The Changes In Microstructural Features And Physical Properties Of Ceramic Matrix Composite Bonding Tools Under Ultrasonic Service,
2023
Chulalongkorn University
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 …
Synthesis Of Sic Nanowires On Biochar Surfaces By A Simple Direct Method,
2023
Chulalongkorn University
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 …
Growth Of Proton Conducting Strontium Cerate Composites,
2023
Chulalongkorn University
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 …
Review Of Materials, Functional Components, Fabrication Technologies And Assembling Characteristics For Polymer Electrolyte Membrane Fuel Cells (Pemfcs) – An Update,
2023
Chulalongkorn University
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 …
Structure And Chemical Durability Improvement Of Alkali Silicate Glass By Zirconium Dioxide And Erbium Oxide Addition,
2023
Chulalongkorn University
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. …
Quantum-Based First-Principles Study Of Gas Molecules (O2 , Co2 , No2 ) Interaction On Monolayer Germanene,
2023
Chulalongkorn University
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.
Synthesis And Modification Of Nickel Hydroxide Particle Synthesized By Self-Assembly And Electron Beam Irradiation Technique For Photocatalyst Activity,
2023
Chulalongkorn University
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 …
