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Articles 1411 - 1440 of 5705

Full-Text Articles in Engineering

Simulation And Prototyping Of A Knee Assistive Device For Improved Gait Function, Khemwutta Pornpipatsakul Jan 2022

Simulation And Prototyping Of A Knee Assistive Device For Improved Gait Function, Khemwutta Pornpipatsakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to develop a knee-assistive device while walking. The research was separated into two sections: the gait support simulation in MATLAB and the prototype of the device. Data on body part positions and ground reaction force were collected from three adult Thai participants walking at a speed of 1.5 m/s to calculate knee moment. The simulation section provides support moments during walking using machine learning and artificial stiffness control strategy (MLASCS), composed of the kNN model and the instantaneous artificial stiffness per body mass (IASPB) equations. The MLASCS was used to determine the proper amount of support moment …

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Protocols Of Improvements For Pmma Denture Base Resin: An Overview, Nidal W. Elshereksi, Fathie A. Kundie, Andanastuti Muchtar, Che H. Azhari Jan 2022

Protocols Of Improvements For Pmma Denture Base Resin: An Overview, Nidal W. Elshereksi, Fathie A. Kundie, Andanastuti Muchtar, Che H. Azhari

Journal of Metals, Materials and Minerals

Polymethyl methacrylate (PMMA) is a polymer that is expansively employed in denture base construction due to its low cost, aesthetics, lightweight, reparability, and processability. Nevertheless, this material is not ideal to fulfill the mechanical and physical characteristics of dental restorations. Despite the popularity of the thermal polymerization method, the main shortcoming is the prolonged curing period. Thus, correctly selecting a polymerization cycle and post-polymerization treatment is needed to achieve promising outcomes. In autoclave polymerization, pressure plays a crucial function in accelerating the initial polymerization as well as decreasing the pores and remaining monomer level, thereby improving the flexural strength. Besides, …

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Bio-Composite Of Nipa Palm Husk Derived Activated Carbon/Poly(Butylene Succinate): An Effective Agricultural Waste Based Adsorbent For Ammonia Removal, Chaichana Piyamawadee, Viboon Sricharoenchaikul, Duangdao Aht-Ong Jan 2022

Bio-Composite Of Nipa Palm Husk Derived Activated Carbon/Poly(Butylene Succinate): An Effective Agricultural Waste Based Adsorbent For Ammonia Removal, Chaichana Piyamawadee, Viboon Sricharoenchaikul, Duangdao Aht-Ong

Journal of Metals, Materials and Minerals

In this work, activated materials were successfully prepared by pyrolyzing various ratios of Nipa palm husk powder to potassium hydroxide  (1:1, 1:2, and 1:3) at predetermined temperatures (500℃, 600℃, and 700℃). The surface area was obtained from nitrogen isotherms using the Brunauer-Emmett-Teller (BET) equation. The surface area of the prepared activated carbon was increased with decreasing potassium hydroxide impregnation ratio and increasing pyrolyzing temperature. The highest surface area was 1,211 m2×g-1. In contrast, acidic surface functional groups investigated by Boehm’s titration were increased with decreasing pyrolyzing temperature and impregnation ratio. Ammonia removal capacity was increased with an increase in the …

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Sintering Behavior Of Nanostructured Β-Cpp Powder Obtained From Avian Eggshell Waste, Bruno Silvano Silva, Tarcília Henrique Amaral Correa, Rômulo Leite Loiola, José Nilson França Holanda Jan 2022

Sintering Behavior Of Nanostructured Β-Cpp Powder Obtained From Avian Eggshell Waste, Bruno Silvano Silva, Tarcília Henrique Amaral Correa, Rômulo Leite Loiola, José Nilson França Holanda

Journal of Metals, Materials and Minerals

In this work the sintering behavior of a nanostructured b-calcium pyrophosphate (b-CPP) powder derived of avian eggshell waste was investigated. The b-CPP pellets were prepared by uniaxial pressing and sintered in air for 2h at temperatures ranging from 600℃ to 1200℃. The sintering behavior was evaluated in terms of linear shrinkage, water absorption, apparent porosity, apparent density, tensile strength, FTIR (Fourier-transform infrared) analysis, and microstructural analysis via SEM (scanning electron microscopy). The results showed that the nanostructured b-CPP powder presented different behaviors with increasing sintering temperature. It was found that sintering at higher temperatures led to greater densification of the …

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Utilization Of Silicon Dioxide Powder From Industrial Wastes As Novel Filler In Rubber Isolator Application, Amorn Ajinsamajan, Adisai Rungvichaniwat, Anuwat Saetung Jan 2022

Utilization Of Silicon Dioxide Powder From Industrial Wastes As Novel Filler In Rubber Isolator Application, Amorn Ajinsamajan, Adisai Rungvichaniwat, Anuwat Saetung

Journal of Metals, Materials and Minerals

The silicon dioxide powder (SP) was an industrial waste and obtained from the silicon metal industry in Thailand. The effect of SP loading on cure characteristics, mechanical, dynamic and endurance properties in natural rubber were investigated and compared to calcium carbonate (CaCO3) and unfilled natural rubber, respectively. Results revealed that the addition of SP significantly affected the cure characteristics and mechanical properties. An increasing content of SP increased the hardness, modulus, tensile strength and tear strength due to a higher SP-rubber interaction but decreased the elongation at break since higher SP in rubber matrix resulting in lesser mobility of rubber …

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Synthesis And Phosphate Adsorption Performance Of Elephant Dung Biochar Modified With Magnesium And Iron, Navod Abeysinghe, Kaewta Jetsrisuparb, K.H.T. Karunarathna, E.P.S. Chandana, Siraprapa Suwanree, Pornnapa Kasemsiri, Prinya Chindaprasirt, Jesper T.N. Knijnenburg Jan 2022

Synthesis And Phosphate Adsorption Performance Of Elephant Dung Biochar Modified With Magnesium And Iron, Navod Abeysinghe, Kaewta Jetsrisuparb, K.H.T. Karunarathna, E.P.S. Chandana, Siraprapa Suwanree, Pornnapa Kasemsiri, Prinya Chindaprasirt, Jesper T.N. Knijnenburg

Journal of Metals, Materials and Minerals

The large production volume combined with the high lignocellulose content makes elephant dung an attractive and underutilized biomass resource, but also presents waste management problems for elephant orphanages. This study explored the conversion of elephant dung into biochars by slow pyrolysis at 500°C for the recovery of phosphate. The unmodified biochar (BC500) had a specific surface area (SBET) of 62.5 m2×g-1 with point of zero charge (pHPZC) of 7.7. Biochar modification with MgCl2 (MgBC500) and FeCl3 (FeBC500) by pre-pyrolysis treatment affected the SBET (48.7 m2×g-1 and 259.4 m2×g-1, respectively) and pHPZC (8.7 and 3.3, respectively). In FeBC500, Fe was present …

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The Structure And Ferromagnetism Of Carbon Nanofibers From Polyacrylonitrile/ Polyvinylpyrrolidone, Suminya Teeta, Ratchaneekorn Wanchanthuek, Somchai Sonsupap, Santi Maensiri, Narong Chanlek, Kwanruthai Wongsaprom Jan 2022

The Structure And Ferromagnetism Of Carbon Nanofibers From Polyacrylonitrile/ Polyvinylpyrrolidone, Suminya Teeta, Ratchaneekorn Wanchanthuek, Somchai Sonsupap, Santi Maensiri, Narong Chanlek, Kwanruthai Wongsaprom

Journal of Metals, Materials and Minerals

Room-temperature ferromagnetism was successfully induced in carbon. Carbon nanofibers were fabricated using sequential electrospinning of polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP). The morphologies, crystal structures, chemical bonding states and magnetic properties were characterized over three different weight ratios which were 10:0, 7:3 and 6:4 of PAN/PVP. The carbon nanofibers obtained after pyrolysis of polymer fibers were placed inside a tube furnace using a three steps process: stabilization, carbonization, and activation at 800℃. XRD patterns indicated the amorphous structure of carbon. The average diameter of the carbon nanofibers was between 340 nm to 511 nm. Raman analysis was used to determine the …

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Effects Of Sputtering Power Of Ti Films On Morphology Of Tio2 Nanotubes Synthesized Via Anodization Process, Pathomporn Junbang, Chantana Aiempanakit, Chantana Aiempanakit Jan 2022

Effects Of Sputtering Power Of Ti Films On Morphology Of Tio2 Nanotubes Synthesized Via Anodization Process, Pathomporn Junbang, Chantana Aiempanakit, Chantana Aiempanakit

Journal of Metals, Materials and Minerals

In this paper, we aimed to find the sputtering power most suitable for fabricating anodized TiO2 nanotubes (TNTs) with high dimensions (diameter and length). TNTs were synthesized via anodization of Ti films deposited on a glass substrate at varying sputtering power from 50 W to 200 W. The properties of Ti films such as crystallinity, residual stress, and roughness were investigated, which affected the morphology of TNTs. Sputtering power levels of 150 W and 200 W were suitable for TNTs formation via the anodization process in NH4F concentrations from 1.0 wt% to 2.5 wt% due to the increased density and …

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Utilization Of Freeze Thaw Process For Polyvinyl Alcohol/Sodium Alginate (Pva/Sa) Hydrogel Composite, Rapeepan Muangsri, Piyachat Chuysinuan, Thanyaluck Thanyacharoen, Supanna Techasakul, Pongpat Sukhavattanakul, Sarute Ummartyotin Jan 2022

Utilization Of Freeze Thaw Process For Polyvinyl Alcohol/Sodium Alginate (Pva/Sa) Hydrogel Composite, Rapeepan Muangsri, Piyachat Chuysinuan, Thanyaluck Thanyacharoen, Supanna Techasakul, Pongpat Sukhavattanakul, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

Polyvinyl alcohol/sodium alginate (PVA/SA) hydrogel was successfully prepared by freeze thaw process. Without crosslinking agent, hydrogel was formed by using 3, 5 and 7 consecutive cycles of freeze thaw. Hydrogel can be formed by hydrogen bonding formation between OH-group of sodium alginate and polyvinyl alcohol throughout network. Scanning electron microscope reported that microstructure of hydrogel was well packed. The interconnect porosity was also observed. Differential scanning calorimetry exhibited that two exothermic peaks at temperature of 110℃ and 225℃ were observed due to evaporation of water molecule and melting temperature of hydrogel, respectively. The swelling behavior was rapidly increased within initial …

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Mechanical And Ballistic Characterization Of High-Density Polyethylene Composites Reinforced With Alumina And Silicon Carbide Particles, Bruno Figueira De Abreu Ferreira Cardoso, Flávio James Humberto Tommasini Vieira Ramos, Pedro Henrique Poubel Mendonça Da Silveira, Anthony Garotinho Barros Assed Matheus De Oliveira, André Ben-Hur Da Silva Figueiredo, Alaelson Vieira Gomes, Valdir Florêncio Da Veiga-Junior Jan 2022

Mechanical And Ballistic Characterization Of High-Density Polyethylene Composites Reinforced With Alumina And Silicon Carbide Particles, Bruno Figueira De Abreu Ferreira Cardoso, Flávio James Humberto Tommasini Vieira Ramos, Pedro Henrique Poubel Mendonça Da Silveira, Anthony Garotinho Barros Assed Matheus De Oliveira, André Ben-Hur Da Silva Figueiredo, Alaelson Vieira Gomes, Valdir Florêncio Da Veiga-Junior

Journal of Metals, Materials and Minerals

This article explores the ballistic and mechanical performance of HDPE matrix composites reinforced with alumina and silicon carbide particles, to be used as lightweight body armor. After processing, the composites were evaluated by tensile tests, Izod impact, and Shore D hardness. In addition, depth of penetration (DOP) and energy absorption tests were performed with chronograph simulating .22 ammunition in the ballistic test. Samples A80 and A70 had the lowest DOP result (15.98 and 17.98 mm respectively) indicating that these samples had the best ballistic performance. Mechanical tests performed on samples A00, A40, A50, and A60 showed that the deformation and …

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Recycling Of Exhausted Dust From Regenerator Of Glass Furnace In Glass Batch Melting, Jitlada Kumpa, Pitcharat Ineure, Parinya Chakartnarodom, Benya Cherdhirunkorn, Edward A. Laitila, Nuntaporn Kongkajun Jan 2022

Recycling Of Exhausted Dust From Regenerator Of Glass Furnace In Glass Batch Melting, Jitlada Kumpa, Pitcharat Ineure, Parinya Chakartnarodom, Benya Cherdhirunkorn, Edward A. Laitila, Nuntaporn Kongkajun

Journal of Metals, Materials and Minerals

In soda-lime glass manufacturing, evaporation of volatile compounds from glass melt is the origin of the dust emission from glass tank furnace. The exhausted dust then is deposited on the regenerator and is needed to be removed. Thus, this study focuses on using the dust from melting glass in glass production. The glass batches were prepared from 0 wt% to 10 wt% of the exhausted dust from soda-lime glass production as a substitution of the total raw materials. The analysis of phase and chemical composition of the dust by x-ray powder diffraction (XRD) and x-ray fluorescence technique (XRF) indicated that …

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Dc Conductivity Of Heavy Metal Oxide (Bi2o3) Boro-Tellurite Glasses: Effect Of Eu2o3, Chinnappareddy Devaraja, G. V. Jagadeesha Gowda Jan 2022

Dc Conductivity Of Heavy Metal Oxide (Bi2o3) Boro-Tellurite Glasses: Effect Of Eu2o3, Chinnappareddy Devaraja, G. V. Jagadeesha Gowda

Journal of Metals, Materials and Minerals

A novel investigation on structural and DC conductivity of Eu2O3 activated heavy metal oxide boro-tellurite (BBTE) glasses were analyzed. The boro-bismuth-tellurite glass samples doped with europium trioxide were fabricated by the conventional melt quenching method. The microstructural and structural studies of the glasses have been done by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The DC conductivity of the BBTE samples has been studied at the frequency range 40Hz-6MHz and in the temperature range 303-453K. The XRD and SEM, confirm the non-crystalline and homogeneous properties of prepared glasses. The DC conductivity of glasses obeys Arrhenius behavior and DC …

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Thermodynamic Determination Of Optimal Conditions For Growing Si1-Xgex Crystals From A Tin Solution On A Silicon Substrate, Alijon Shonazarovich Razzokov, Khushnudbek Odilbekovich Eshchanov Jan 2022

Thermodynamic Determination Of Optimal Conditions For Growing Si1-Xgex Crystals From A Tin Solution On A Silicon Substrate, Alijon Shonazarovich Razzokov, Khushnudbek Odilbekovich Eshchanov

Journal of Metals, Materials and Minerals

Thermodynamic calculations have been carried out for growing crystalline Si1-xGex solid solution epitaxial films on Si<100> and Si<111> substrates from a tin solution-melt by liquid-phase epitaxy. Nanoclusters are thought to be involved in crystal growth. To determine the optimal conditions for obtaining a Si1-xGex crystal from a Si-Ge-Sn solution system, we focused on the change in Gibbs energy and the size of the nanoclusters involved in crystal formation. On this basis, a film with a thickness of 5 µm to 8 µm was experimentally obtained in the temperature range from Тc.s.=1135 K (crystallization start temperature) to Тc.t.=1023 K (crystallization termination …

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Progress Of Water Desalination Applications Based On Wettability And Surface Characteristics Of Graphene And Graphene Oxide: A Review, Husam Hussein Ibrahim Eltigani, Yuttanant Boonyongmaneerat Jan 2022

Progress Of Water Desalination Applications Based On Wettability And Surface Characteristics Of Graphene And Graphene Oxide: A Review, Husam Hussein Ibrahim Eltigani, Yuttanant Boonyongmaneerat

Journal of Metals, Materials and Minerals

Seawater desalination techniques have been continuously developed to tackle the water scarcity problems. This review article provides comprehensive discussion on the progress of water desalination applications that utilize the unique wettability and surface characteristics of graphene and graphene oxides, which are being employed as ultrafiltration membranes in either a monolayer or multilayer nanosheet configuration. The interaction of water with graphene materials and their wetting characteristics as well as the controlling factors are examined.  Particularly, the designs and roles of hydrophilic and hydrophobic nanopores and nanochannels are discussed. A focus is also made on recent developments of graphene membrane with respect …

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Tailoring The Structural And Optical Properties Of Zinc Oxide With Addition Of Bismuth Oxide Prepared By Two Step Process, Saedah Munirah Sanusi, Ruziana Mohamed, Nurin Jazlina Ahmad, Myzatul Azlyn Muhamad Jan 2022

Tailoring The Structural And Optical Properties Of Zinc Oxide With Addition Of Bismuth Oxide Prepared By Two Step Process, Saedah Munirah Sanusi, Ruziana Mohamed, Nurin Jazlina Ahmad, Myzatul Azlyn Muhamad

Journal of Metals, Materials and Minerals

This study was done to investigate the impact of bismuth oxide (Bi2O3) composites on the zinc oxide (ZnO) properties for varistor applications. ZnO-Bi2O3 samples were prepared using a two-step process, precipitation, and solid-state method. Bi2O3 was added into ZnO at various concentrations (0, 0.5, 1.0 and 1.5 mol%). All samples were characterized using X-ray diffraction (XRD), Scanning electron microscope (SEM) and UV visible spectroscopy. XRD results have shown that the crystallite size of ZnO-Bi2O3 samples became smaller when Bi2O3 was added from 0.5 mol% to 1.0 mol%. However, the crystallite size of ZnO-Bi2O3 increased over 1.0 mol% of Bi2O3 concentration. …

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A Molecular Dynamics Simulation Study To Investigate The Effect Of C60 On Thermo- Mechanical And Elastic Properties Of Dgeba/Deta Nanocomposites, Dhritiman Talukdar, Sudipta Halder, Subhankar Das, M.S. Goyat, Abhishek Kumar Mishra Jan 2022

A Molecular Dynamics Simulation Study To Investigate The Effect Of C60 On Thermo- Mechanical And Elastic Properties Of Dgeba/Deta Nanocomposites, Dhritiman Talukdar, Sudipta Halder, Subhankar Das, M.S. Goyat, Abhishek Kumar Mishra

Journal of Metals, Materials and Minerals

Molecular dynamics simulations were performed to investigate the effect of  fullerenes (C60) on the thermal and mechanical properties of a cross-linked epoxy system composed of epoxy resin DGEBA and curing agent DETA. Hence, a comparative investigation was performed on the thermal and mechanical properties of DGEBA/DETA reinforced with 2.3 wt% C60 and neat epoxy systems. Properties such as glass transition temperature (GTT), coefficients of thermal expansion (CTE), and elastic properties at different cross-linking densities. Simulation results indicated that the GTT of the epoxy increased by about 25 K due to the presence of C60. The effect of C60 on the …

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Sm3+ Doped Mn-Zn Mixed Ferrites: Synthesis And Characterization, Anjali Shrivastava, A. K. Shrivastava Jan 2022

Sm3+ Doped Mn-Zn Mixed Ferrites: Synthesis And Characterization, Anjali Shrivastava, A. K. Shrivastava

Journal of Metals, Materials and Minerals

Pure and Samarium (Sm3+) doped Mn-Zn ferrites were synthesized using Co-precipitation method. The Sm3+ concentration varied from 0.1% to 0.3%. This was added to the solution during the synthesis of Mn-Zn ferrites (Mn0.5Zn0.5Fe2O4) at room temperature. The precipitate so obtained was annealed at 200℃ for 4 h and then crushed to powder. The powdered material was subjected to structural, morphological, compositional, optical and magnetic characterization. XRD shows cubic spinal structure with crystallite size of the order of 6 nm. TEM and SEM images show spherical particles are in good agreement with XRD data. EDAX indicates stoichiometry of elements present in …

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Multi-Responsive Rotaxane With Tunable Fluorescence Under Azobenzene-Based Benzoxazine Structure, Sorapat Niyomsin, Suwabun Chirachanchai, Toshikazu Takata Jan 2022

Multi-Responsive Rotaxane With Tunable Fluorescence Under Azobenzene-Based Benzoxazine Structure, Sorapat Niyomsin, Suwabun Chirachanchai, Toshikazu Takata

Journal of Metals, Materials and Minerals

Rotaxanes are known for the mechanically interlocked molecules for decades. The present work demonstrates a method to prepare multi-responsive rotaxane by conjugating with a multi-responsive supramolecule. Benzoxazine dimers, N, N’-bis(3,5-dimethyl-2-hydroxybenzyl) methylamine derivatives, are good models because their simple chemistry. An azobenzene containing benzoxazine with remaining hydroxyl group for further conjugation with rotaxane was designed. The ring opening of rotaxane using fluorescent phenol provides benzoxazine dimer with metal ion responsive and fluorescent properties. Based on this concept, light responsive benzoxazine conjugated with rotaxane system shows light, metal ion and rotaxane shuttling responsiveness which can be followed by fluorescent signals. The present …

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Synthesis Of Cacu3ti4o12 Utilizing Eggshell Waste As A Calcium Source: Structure, Morphology, And Dielectric Properties, Akhiruddin Maddu, Habiburahmat Yulwan, Irmansyah Sofian, Ahmad Sofyan Sulaeman, Permono Adi Putro Jan 2022

Synthesis Of Cacu3ti4o12 Utilizing Eggshell Waste As A Calcium Source: Structure, Morphology, And Dielectric Properties, Akhiruddin Maddu, Habiburahmat Yulwan, Irmansyah Sofian, Ahmad Sofyan Sulaeman, Permono Adi Putro

Journal of Metals, Materials and Minerals

Calcium copper titanate (CaCu3Ti4O12, CCTO) has been synthesized utilizing eggshell waste as a source of calcium through the hydrothermal route, followed by annealing treatment at temperatures 950°C and 1050°C. The sample with annealing temperatures of 950°C and 1050°C is named CTO-A and CCTO-B, respectively. The structure, microstructure, and dielectric properties of CCTO samples were investigated. The X-ray diffraction analysis results confirmed that the pure phase of CCTO has been successfully synthesized as identified in the diffraction pattern. The average crystallite size of CCTO is quite large due to annealing at high-temperature. The morphology of CCTO by electron microscopy investigation showed …

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Extraction, Characterization, And Improvement Of Banana Stem And Water Hyacinth Cellulose Fibers As Reinforcement In Cementitious Composites, Supranee Laoubol, Piyalak Ngernchuklin, Malinee Leekrajang Jan 2022

Extraction, Characterization, And Improvement Of Banana Stem And Water Hyacinth Cellulose Fibers As Reinforcement In Cementitious Composites, Supranee Laoubol, Piyalak Ngernchuklin, Malinee Leekrajang

Journal of Metals, Materials and Minerals

A sequential treatment for cellulose isolation from the banana stalk (BNSF) and water hyacinth (WHCF) based on the simultaneous fractionation of hemicelluloses and lignin by alkaline peroxide extraction has been studied. The crude cellulose was then purified by using an acetic acid-nitric acid mixture and further bleached with acidified sodium chlorite. The isolated cellulose was subject to analyses of associated hemicelluloses and lignin content. The structural changes between crude and purified celluloses were revealed by using FT-IR, TGA, and XRD analyses. The successive alkaline and bleaching treatments led to a significant loss in hemicelluloses and lignin, enrichment of the cellulose …

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A Holistic Review On The Synthesis Techniques Of Spinel Structured Lithium Cobalt Manganese Tetroxide, Chee Wayne Tan, Zul Hilmi Che Daud, Zainab Asus, Mohd Hasbullah Idris, Izhari Izmi Mazali, Mohd Ibthisham Ardani, Mohd Kameil Abdul Hamid Jan 2022

A Holistic Review On The Synthesis Techniques Of Spinel Structured Lithium Cobalt Manganese Tetroxide, Chee Wayne Tan, Zul Hilmi Che Daud, Zainab Asus, Mohd Hasbullah Idris, Izhari Izmi Mazali, Mohd Ibthisham Ardani, Mohd Kameil Abdul Hamid

Journal of Metals, Materials and Minerals

Spinel structured lithium cobalt manganese tetroxide (LiCoMnO4) which exhibit unrivalled reduction potential of 5.3V (vs. Li0 | Li+) was identified to be one of the potential cathode candidates for next generation lithium-ion batteries offering high voltage output and energy density. The focal point of this article is to holistically review relevant techniques established for the synthesis of LiCoMnO4 compound, particularly solid-state reaction, sol-gel synthesis, flux method and hydrothermal technology. Electrochemical performances of lithium cobalt manganese tetroxide (LiCoMnO4) synthesised via the four distinctive approaches as well as the critical process parameters will be compared and scrutinised. Adversities associated with deoxygenation in …

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Ecological Dyeing Of Acrylic Yarn With Colorant Derived From Natural Lac Dye, Nattaya Vuthiganond, Pisutsaran Chitichotpanya, Monthon Nakpathom, Rattanaphol Mongkholrattanasit Jan 2022

Ecological Dyeing Of Acrylic Yarn With Colorant Derived From Natural Lac Dye, Nattaya Vuthiganond, Pisutsaran Chitichotpanya, Monthon Nakpathom, Rattanaphol Mongkholrattanasit

Journal of Metals, Materials and Minerals

In recent years, the application of natural dyes in textile coloration has attracted significant study interest. In this current study, the bio-based dyeing of synthetic textile fiber, specifically acrylic yarn, with natural lac dye was investigated. The yarn was dyed using a meta-mordanting technique. The dyeing parameters, including temperature, time, pH of the dye bath, dye concentration, mordant type, and mordant concentration, were examined. Two eco-mordants, aluminium sulfate and ferrous sulfate, are compared against an eco-restricted copper sulfate in terms of color strength and fastness. The results demonstrated that the meta-mordanting technique can be used to dye acrylic fiber using …

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Preparation Of Bacterial Cellulose Film From Rotten Fruits For Mulching Film Application, Nattapong Pinpru, Varol Intasanta, Thitirat Charoonsuk, Supharada Khaisaat, Oubonwan Sawanakarn, Naratip Vittayakorn, Somsak Woramongkolchai Jan 2022

Preparation Of Bacterial Cellulose Film From Rotten Fruits For Mulching Film Application, Nattapong Pinpru, Varol Intasanta, Thitirat Charoonsuk, Supharada Khaisaat, Oubonwan Sawanakarn, Naratip Vittayakorn, Somsak Woramongkolchai

Journal of Metals, Materials and Minerals

This research aims to reduce production capital costs and added value to natural products. The bio-mulching film was prepared by bacterial cellulose (BC) “Acetobacter xylinum”, extracted from three rotten fruits, grape, coconut, and pineapple under standard tests in the laboratory. The analysis from the FTIR technique confirmed to cellulose molecular vibration of BC films. XRD pattern was matched to structure crystallinity of JCPDS standard file which possessed a high percentage of crystallinity. The SEM micrographs were also revealed the 3D nanofiber network structure. The absorption capability of BC films could highly hold water in its structure. In addition, …

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Effect Of Pore Modifiers On Physical And Mechanical Properties Of High-Performance Cement Mortar, Kisun Chunti, Sureerat Polsilapa, Parinya Chakartnarodome, Passakorn Sonprasarn, Wichit Prakaypan, Edward A. Laitila Jan 2022

Effect Of Pore Modifiers On Physical And Mechanical Properties Of High-Performance Cement Mortar, Kisun Chunti, Sureerat Polsilapa, Parinya Chakartnarodome, Passakorn Sonprasarn, Wichit Prakaypan, Edward A. Laitila

Journal of Metals, Materials and Minerals

Two different pore modifiers (PM), artificial pozzolan (AP) and modified aluminum salt (MA), were introduced into the composition of a High Performance Cement Mortar (HPCM). The chemical compositions of raw materials, ordinary Portland cement (OPC), sea sand, AP, and MA were identified by X-Ray Fluorescence spectrometry (XRF). The hydration kinetics resulting from each PM added to the HPCM was investigated by the relevance of hydration temperature. The mechanical properties such as compressive strength, dynamic modulus of rupture, and dynamic modulus of elasticity were measured as well as water absorption and density. Additionally, Scanning Electron Microscope (SEM) and Brunauer-Emmett-Teller (BET) were …

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The Effects Of Double Intercritical Annealing On Microstructure And Mechanical Properties Of 0.107c-2.39mn-0.453si Dual Phase Steel, Nithi Saenarjhan, Gobboon Lothongkum, Jatupon Opapaiboon Jan 2022

The Effects Of Double Intercritical Annealing On Microstructure And Mechanical Properties Of 0.107c-2.39mn-0.453si Dual Phase Steel, Nithi Saenarjhan, Gobboon Lothongkum, Jatupon Opapaiboon

Journal of Metals, Materials and Minerals

In this study, double intercritical annealing was applied to modify the mechanical properties of 0.107%C-2.39%Mn-0.453%Si dual phase steel. The effects of the double intercritical annealing (DIA) method were investigated via microstructure observation and tensile test, and then compared with the single intercritical annealing (SIA) method. By increasing the intercritical annealing temperature, yield and tensile strengths increase while ductility decreases primarily due to the increase of martensite fraction. DIA leads to a slight reduction of the ferrite size and the martensite fraction regardless of the intercritical annealing temperature. Tensile results showed that DIA increases ductility without losing significant amount of strength. …

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Utilization Of Rubber Tree Bark As A Carbon Source For Electric Arc Furnace Steelmaking: Carbon/Slag Interaction At 1550℃, Wasutha Bandityaruck, Weerayut Srichaisiriwaech, Somyote Kongkarat Jan 2022

Utilization Of Rubber Tree Bark As A Carbon Source For Electric Arc Furnace Steelmaking: Carbon/Slag Interaction At 1550℃, Wasutha Bandityaruck, Weerayut Srichaisiriwaech, Somyote Kongkarat

Journal of Metals, Materials and Minerals

Rubber tree bark (RTB) is a biomass that consists of wood and rubber parts, with high volatile and ash contents. This research reports the utilization of RTB as a carbon source in Electric Arc Furnace steelmaking processes. RTB was mixed with coal at a ratio of 1:1 by weight, and heated at 1000℃ under an argon atmosphere for 1 h. The chars were brought to contact with Electric Arc Furnace slag (37.86 wt% Fe2O3) at 1550℃ for 15 min to investigate their interaction and compared to coal. Coal showed short slag foaming behavior with a foaming time of 4 min, …

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Green Acidic Catalyst From Cellulose Extracted From Sugarcane Bagasse Through Pretreatment By Electron Beam Irradiation And Subsequent Sulfonation For Sugar Production, Thitirat Rattanawongwiboon, Prim Chanklinhorm, Threeraphat Chutimasakul, Tanagorn Kwamman, Wilasinee Kingkam, Rattapon Khamlue, Sarute Ummartyotin Jan 2022

Green Acidic Catalyst From Cellulose Extracted From Sugarcane Bagasse Through Pretreatment By Electron Beam Irradiation And Subsequent Sulfonation For Sugar Production, Thitirat Rattanawongwiboon, Prim Chanklinhorm, Threeraphat Chutimasakul, Tanagorn Kwamman, Wilasinee Kingkam, Rattapon Khamlue, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

The objective of this research is to prepare a green acidic catalyst from cellulose derived from sugarcane bagasse (SB). Initially, SB was pretreated by electron beam irradiation with a dose of 50 kGy to 200 kGy and subsequent acid hydrolysis to obtain cellulose. The cellulose derived from SB was carbonized at different temperatures for 4 h and then sulfonated with heating at 120°C under reflux. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to confirm the successful preparation of acidic catalyst by irradiation pretreatment and subsequent sulfonation. The cellulose derived from irradiated SB at the lowest dose …

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Sugarcane Waste-Derived Activated Carbon For Lithium-Sulfur Batteries With Enhanced Performance By Thiourea Doping, Yanisa Thumkaew, Vipada Petson, Thanapat Jorn-Am, Natee Sirisit, Chalathorn Chanthad, Jedsada Manyam, Xiao Liang, Shufeng Song, Peerasak Paoprasert Jan 2022

Sugarcane Waste-Derived Activated Carbon For Lithium-Sulfur Batteries With Enhanced Performance By Thiourea Doping, Yanisa Thumkaew, Vipada Petson, Thanapat Jorn-Am, Natee Sirisit, Chalathorn Chanthad, Jedsada Manyam, Xiao Liang, Shufeng Song, Peerasak Paoprasert

Journal of Metals, Materials and Minerals

In this work, bio-renewable sugarcane bagasse and leaf were utilized for the preparation of activated carbon (BAC and LAC), which was then employed as the host material in lithium-sulfur (Li-S) batteries. The activated carbon, for the first time, was doped with nitrogen and sulfur via the addition of thiourea during the synthesis of carbon char via a simple, one-step hydrothermal method. The activated carbon was used to fabricate the cathodes of the CR2032 coin cells. The amount of added thiourea was found to influence the nitrogen/sulfur content, porosity, amorphous/graphitic structure, and performance of the activated carbon.  At 0.2C, BAC2 (4.15 …

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Preparation Of Spent Coffee Grounds-Rubber Composites Using Natural Rubber Latex As Binder, Varittha Mitsaichon, Kanok-On Ruaesrijan, Pranee Phinyocheep, Taweechai Amornsakchai, Preeyanuch Junkong, Sombat Thanawan Jan 2022

Preparation Of Spent Coffee Grounds-Rubber Composites Using Natural Rubber Latex As Binder, Varittha Mitsaichon, Kanok-On Ruaesrijan, Pranee Phinyocheep, Taweechai Amornsakchai, Preeyanuch Junkong, Sombat Thanawan

Journal of Metals, Materials and Minerals

The aim of this work was to explore the use of natural rubber latex (NRL) as a natural binder (according to the BCG concept) to replace commercial synthetic binders such as polyurethane resin. A composite sheet of spent coffee ground (SCG) and natural rubber (NR) was prepared by mixing of SCG in NRL compounds having concentrations of 30% and 60% dry rubber content (DRC). The amount of SCG in the composites was varied from 33 to 167 part per hundred rubber (phr). The mixture was cast in a mold to form a thin sheet then left drying at room temperature …

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Erratum To: In Search For Near-Room-Temperature Superconducting Critical Temperature Of Metal Superhydrides Under High Pressure: A Review, Udomsilp Pinsook Jan 2022

Erratum To: In Search For Near-Room-Temperature Superconducting Critical Temperature Of Metal Superhydrides Under High Pressure: A Review, Udomsilp Pinsook

Journal of Metals, Materials and Minerals

No abstract provided.

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