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Articles 1081 - 1110 of 5701

Full-Text Articles in Engineering

Corrosion Of A Spark Plasma Sintered Fe-Cr-Mo-B-C Alloy In 3.5% Nacl Solution, Mudassir Farooq, Sohail Muhammad, A. A. Sorour Jan 2023

Corrosion Of A Spark Plasma Sintered Fe-Cr-Mo-B-C Alloy In 3.5% Nacl Solution, Mudassir Farooq, Sohail Muhammad, A. A. Sorour

Journal of Metals, Materials and Minerals

In this study, the corrosion behavior of a Fe-Cr-Mo-B-C alloy, fabricated by spark plasma sintering of an amorphous alloy powder, in 3.5% NaCl solution was analyzed. Electrochemical impedance spectroscopy and potentiodynamic polarization are techniques which were used for electrochemical performance estimation of samples and the results were further compared with conventional alloys: 1080 carbon steel and 304 stainless steel. Corrosion surface products were characterized through Scanning electron microscopy, Energy dispersive x-ray spectroscopy and X-ray photoelectron spectroscopy. Specimens sintered at 800℃ (S1-800) had achieved 94% densification approximately while the sample sintered at 900℃ (S2-900), had densified more which was 98% approximately. …

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Synthesis Of Zircon Pigments From Rice Husk Ash And Their Performance In Ceramic Glaze, Niti Yongvanich, Peerapat Soysom, Worachet Ratkasemsak Jan 2023

Synthesis Of Zircon Pigments From Rice Husk Ash And Their Performance In Ceramic Glaze, Niti Yongvanich, Peerapat Soysom, Worachet Ratkasemsak

Journal of Metals, Materials and Minerals

ZrSiO4-based pigments have been known to be very stable in ceramic glazes but require a high firing temperature required for phase formation. This study examined the feasibility of using rice husk waste as a substitute for crystalline SiO2. The amorphous form of silica with some impurities was obtained by calcining the rice husk at 800℃. The general chemical formula were (Zr0.9M0.1)SiO4, where M = V, Pr, Fe and Cr. The solid-state processing was achieved by firing at 1300℃ for 12 h with NaF (5 wt%). X-ray Diffraction revealed a lower relative fraction between ZrO2 (secondary phase) and ZrSiO4 in the …

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Investigation Of Surface Hardness And Roughness On Formability Of Aluminum Alloy Sheet Aa2024-T3 Subjected To The Shot Peening Process By Silica Shots, Jurarat Sawangpan, Sansot Panich, Tanakorn Jantarasricha, Anak Khantachawana Jan 2023

Investigation Of Surface Hardness And Roughness On Formability Of Aluminum Alloy Sheet Aa2024-T3 Subjected To The Shot Peening Process By Silica Shots, Jurarat Sawangpan, Sansot Panich, Tanakorn Jantarasricha, Anak Khantachawana

Journal of Metals, Materials and Minerals

Shot peening is one type of modified surface treatment that produces a residual compressive stress on the material subsurface and improves surface properties while generating plastic deformation on the surface. This research work aims to improve surface properties, which include the enhanced material formability of aluminum alloy 2024-T3 sheet having 1.2 mm of thickness, by providing residual compressive stress on the surface using the shot peening process, which uses silica particles of 0.1 mm in diameter. First, shot peening was performed using various process parameters: compressed air, distance from nozzle to target, and duration time. Based on the obtained peening …

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Development Of Inexpensive Device For Methanol Detection In Hand Sanitizer Gel Using Manganese-Doped Zinc Sulfide Quantum Dots Modified By N-Methylpolypyrrole, Sophanat Khenthaphak, Pakorn Juleang, Wanida Wonsawat, Orawon Chailapakul, Eakkasit Punrat Jan 2023

Development Of Inexpensive Device For Methanol Detection In Hand Sanitizer Gel Using Manganese-Doped Zinc Sulfide Quantum Dots Modified By N-Methylpolypyrrole, Sophanat Khenthaphak, Pakorn Juleang, Wanida Wonsawat, Orawon Chailapakul, Eakkasit Punrat

Journal of Metals, Materials and Minerals

A method for methanol detection by an inexpensive device using a nanomaterial modified by N-methylpolypyrrole (NMPPY) has been developed. Manganese-doped zinc sulfide quantum dots (Mn/ZnS-QDs) were synthesized and then characterized by a fluorescence spectrophotometer to study their spectroscopic properties. Mn/ZnS-QDs were modified with NMPPy and studied by digital-image colorimetry to optimize conditions for methanol detection. A 2 mL of 3000 mg∙L–1 Mn/ZnS-QDs modified with 300 μL of 1000 mg∙L-1 of NMPPy was chosen to be a detecting reagent for methanol determination. Under the optimum conditions, the linear range was found to be 2%v/v to 50%v/v of methanol with R-square of …

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Surface Modification Of Activated Carbon From Sago Waste, Khaeriah Dahlan, Yane Oktovina Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani Jan 2023

Surface Modification Of Activated Carbon From Sago Waste, Khaeriah Dahlan, Yane Oktovina Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani

Journal of Metals, Materials and Minerals

In this paper, we analyzed the effect of surface modification on the surface properties of the active carbon from sago waste using varied oxidizers, namely H2O2, HNO3, and H2SO4. The ordinary active carbon has an initial surface area of 546.6 m2∙g-1, with a phenol and carboxylic functional group. The porosity, functional groups and morphological surface, together with the chemical composition of activated carbon were examined using a nitrogen adsorption-desorption through the Brunauer Emmett Teller (BET) method and the calculation of Barret-Joyner-Hall (BJH), a Fourier-transformed infrared spectroscopy, and a scanning electron microscopy with energy dispersive spectroscopy. The results found that the …

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Impact Of Microwave Synthesis Time On The Shape Of Silver Nanostructures And Their Antibacterial Activity, Nhat Hieu Hoang, Van Nghia Nguyen, Thi Tho Nguyen, Thi Mong Diep Nguyen Jan 2023

Impact Of Microwave Synthesis Time On The Shape Of Silver Nanostructures And Their Antibacterial Activity, Nhat Hieu Hoang, Van Nghia Nguyen, Thi Tho Nguyen, Thi Mong Diep Nguyen

Journal of Metals, Materials and Minerals

Silver is a well-known effective antibacterial and disinfectant material with relatively few side effects. Nanosilver derived from it, have strong antibacterial, antifungal and broad-spectrum antiviral properties. This study describes how the microwave synthesis durations of silver nanoparticles affect their shape, and the effect of the shapes of these nanoparticles on their antibacterial activity. The optical properties of the nanosilver were examined through UV-Vis absorption spectroscopy. The morphology of the grain was determined by transmission electron microscopy (TEM), and the crystallinity of the nanosilver was confirmed by X-ray diffraction (XRD). The antibacterial activities were assessed using bacterial pathogens Bacillus cereus and …

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Mechanical Behavior And Physicochemical Modifications In Lignosulfonate-Treated Fique (Furcraea Andina) Fibers, Beatriz Dantas Lourenço Da Silva, Paula Lage Agrize, Betina Carvalho Veiga, Lucio Fabio Cassiano Nascimento, Camila Aparecida Abelha Rocha, Fábio De Oliveira Braga Jan 2023

Mechanical Behavior And Physicochemical Modifications In Lignosulfonate-Treated Fique (Furcraea Andina) Fibers, Beatriz Dantas Lourenço Da Silva, Paula Lage Agrize, Betina Carvalho Veiga, Lucio Fabio Cassiano Nascimento, Camila Aparecida Abelha Rocha, Fábio De Oliveira Braga

Journal of Metals, Materials and Minerals

One of the most frequent problems in biocomposites is the physical/chemical incompatibility between natural lignocellulosic fibers (NLF) and the matrix. Physical and/or chemical treatments are the most common approach to improve interface properties. Seeking for environmentally friendly treatments, lignosulfonates (LSs) have been considered for surface modification of NLF due to their amphiphilic properties. Thus, the objective of the present work is to evaluate the influence of sodium LS (SLS) treatment protocols in the properties and mechanical behavior of fique (Furcraea Andina) fibers. X-ray diffraction (XRD), Thermogravimetric (TGA) and spectroscopic (FTIR) analyzes were performed, as well as optical microscopy, …

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Thermal And Mechanical Evaluation Of Natural Fibers Reinforced Gypsum Plaster Composite, Tugba Mutuk, Kerem Arpacioğlu, Sevim Alişir, Gökhan Demir Jan 2023

Thermal And Mechanical Evaluation Of Natural Fibers Reinforced Gypsum Plaster Composite, Tugba Mutuk, Kerem Arpacioğlu, Sevim Alişir, Gökhan Demir

Journal of Metals, Materials and Minerals

Many problems such as the increase in the world population, global drought, and greenhouse gases have caused materials used in industries to be reconsidered. This is how the concept of green composite material emerged. Using natural fibers to obtain such materials is important in terms of sustainability. This study is aimed to use hemp fiber and banana fiber as natural fiber additives in the gypsum composite to produce green bio-composite. Natural fibers are chemically modified with 5% NaOH solution. In this way, a good fiber/matrix interface interaction is provided. The composite hardness test result of 5 wt% HB fiber added …

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Investigation Of Oxide Scale Adhesion On Hot-Rolled Steel Using The Tensile Test And Acoustic Emission, Seksan Singthanu, Prayoon Surin, Manop Pipathattakul, Thanasak Nilsonthi Jan 2023

Investigation Of Oxide Scale Adhesion On Hot-Rolled Steel Using The Tensile Test And Acoustic Emission, Seksan Singthanu, Prayoon Surin, Manop Pipathattakul, Thanasak Nilsonthi

Journal of Metals, Materials and Minerals

This article addresses applying a tensile test with a CCD camera to assess scale adhesion on hot-rolled steel as a function of hot-rolled coil position. The scale adhesion in this study was shown in the value of the strain initiating the first scale spallation. The result of strain initiating the first scale spallation was confirmed with an acoustic emission (AE) method. The as-received hot-rolled coil was studied at the head, middle, and tail positions. A scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to examine the scale morphology and phase identification respectively. The results show that the oxide …

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Effect Of Nano Cdo-Zno Content On Structural, Thermal, Optical, Mechanical And Electrical Properties Of Epoxy Composites, Chaitra Srikanth, Gattumane Motappa Madhu Jan 2023

Effect Of Nano Cdo-Zno Content On Structural, Thermal, Optical, Mechanical And Electrical Properties Of Epoxy Composites, Chaitra Srikanth, Gattumane Motappa Madhu

Journal of Metals, Materials and Minerals

Cadmium oxide doped zinc oxide nanoparticles were synthesized by solution combustion technique. CdO-ZnO nanoparticles were reinforced into epoxy by ultrasonication technique. CdO-ZnO nano-particles are well known semiconducting materials which are found to exhibit excellent semiconducting behavior even at high frequencies. Hence it was introduced into epoxy to study the semiconducting nature of CdO-ZnO/epoxy composites. The polymer composites exhibited interesting phenomenon such as minimum heat losses at high frequencies indicating semi-conducting behaviour of the composites. The polymer composite was also analysed for its structural, thermal, optical and mechanical properties. The enhanced interaction of CdO-ZnO nanoparticles with epoxy has resulted in superior …

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Synthesis Of Zinc Oxide Photocatalysts From Zinc-Dust Waste For Organic Dye Degradation, Wanwalee Promsuwan, Pornapa Sujaridworakun, Wuttichai Reainthippayasaku Jan 2023

Synthesis Of Zinc Oxide Photocatalysts From Zinc-Dust Waste For Organic Dye Degradation, Wanwalee Promsuwan, Pornapa Sujaridworakun, Wuttichai Reainthippayasaku

Journal of Metals, Materials and Minerals

Zinc-dust waste from a hot-dip galvanizing plant in the metal plating industry was successfully used as the starting material to synthesize zinc oxide (ZnO) nanopowder via a hydrothermal method. Effects of acid types in zinc-dust dissolving process and concentration of NaOH for precipitation on physical characteristics and photocatalytic activity of the synthesized ZnO were investigated. Elemental composition, phase and crystallite size, morphology with chemical composition, and specific surface area of the ZnO nanostructures were characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), and gas adsorption-desorption analysis, respectively. The photocatalytic performance …

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Investigations Of Structural Modifications, Physical And Optical Properties Of Lead Boro-Tellurite Glasses Doped With Europium Trioxide For Possible Optical Switching Applications, G. V. Jagadeesha Gowda, G. V. Ashok Reddy, Bheemaiah Eraiah, Chinnappa Reddy Devaraja Jan 2023

Investigations Of Structural Modifications, Physical And Optical Properties Of Lead Boro-Tellurite Glasses Doped With Europium Trioxide For Possible Optical Switching Applications, G. V. Jagadeesha Gowda, G. V. Ashok Reddy, Bheemaiah Eraiah, Chinnappa Reddy Devaraja

Journal of Metals, Materials and Minerals

This manuscript intends to the structural modifications, and physical and optical properties of a set of heavy metal alkali boro-tellurite glasses doped with Eu2O3. These glasses were produced by a conservative melt-quenching method. The existence of non-crystalline properties in the glasses was ascertained by X-ray diffraction analysis. The structural modifications were noticed by MAS-NMR spectroscopic investigation. Physical properties such as density, molar volume, oxygen packing density, average boron-boron separation, interionic distance, and polaron radius have been calculated by a suitable approach. The optical absorption studies were made through UV-visible absorption spectroscopy in the 350 nm to 800 nm wavelength range. …

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The Influence Of Water-Cement Ratios And Alumino-Silicate Based Accelerator On The Properties Of Fiber-Reinforced Cement Composites, Parinya Chakartnarodom, Passakorn Sonprasarn, Sureerat Polsilapa, Nuntaporn Kongkajun, Edward Laitila, Wichit Prakaypan Jan 2023

The Influence Of Water-Cement Ratios And Alumino-Silicate Based Accelerator On The Properties Of Fiber-Reinforced Cement Composites, Parinya Chakartnarodom, Passakorn Sonprasarn, Sureerat Polsilapa, Nuntaporn Kongkajun, Edward Laitila, Wichit Prakaypan

Journal of Metals, Materials and Minerals

Due to more strict environmental protection and greenhouse gas reduction, it is very important for all industries to appropriately manage their energy consumption.  Fiber- reinforced cement composites are the popular building materials which consume enormous energy to intensify its chemical reaction during the autoclave steam curing process. Utilization of chemical admixture to replace the conventional energy-driven autoclave steam curing process will support the fiber- reinforced cement composites industry to develop sustainable building materials.  In this research, typical and mechanical properties of the air-cured fiber- reinforced cement composites incorporated with alumino-silicate based accelerator were investigated.  The results show an excellent correlation …

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Synthesis, Characterization, And Application Of Zif-8 For Removal Of Cd, Ni, And Pb Ions From Aqueous Solutions: Optimization Of The Process By Response Surface Methodology (Rsm) Based On Central Composite Design (Ccd) Technique, Amir Khosravi, Maryam Randjbar, Razieh Habibpour Jan 2023

Synthesis, Characterization, And Application Of Zif-8 For Removal Of Cd, Ni, And Pb Ions From Aqueous Solutions: Optimization Of The Process By Response Surface Methodology (Rsm) Based On Central Composite Design (Ccd) Technique, Amir Khosravi, Maryam Randjbar, Razieh Habibpour

Journal of Metals, Materials and Minerals

A Zeolitic imidazolate framework-8 (ZIF-8) was synthesized by the solvothermal method of zinc nitrate hexahydrate and 2-methylimidazole in DMF to remove Cd(II), Ni(II), and Pb(II) ions from aqueous solutions. The synthesized ZIF-8 was distinguished by XRD, FT-IR, BET, SEM, EDX, TEM methods. Several significant variables were optimized with response surface methodology (RSM) to obtain the highest removal of metal ions. According to the achieved results, the aqueous solution pH values of 6.5, 6.5, and 6.0, ZIF-8 dosages of 0.05, 0.06, and 0.05 g⸳L-1, and metal ions initial concentrations of 50, 60, and 60 mg⸳L-1 were chosen as the optimum amount …

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A Study Of The Electrical And Optical Properties Of Azo Thin Film By Controlling Pulse Frequency Of Hipims, Peerapong Nuchuay, Chinoros Laongwan, Wimol Promcham, Pacharamon Somboonsaksri, Sukon Kalasung, Chanunthorn Chananonnawathorn, Pitak Eiamchai, Viyapol Patthanasettakul, Chamnan Promjantuk, Kittikhun Seawsakul, Noppadon Nuntawong, Mati Horprathumb, Saksorn Limwichean Jan 2023

A Study Of The Electrical And Optical Properties Of Azo Thin Film By Controlling Pulse Frequency Of Hipims, Peerapong Nuchuay, Chinoros Laongwan, Wimol Promcham, Pacharamon Somboonsaksri, Sukon Kalasung, Chanunthorn Chananonnawathorn, Pitak Eiamchai, Viyapol Patthanasettakul, Chamnan Promjantuk, Kittikhun Seawsakul, Noppadon Nuntawong, Mati Horprathumb, Saksorn Limwichean

Journal of Metals, Materials and Minerals

The transparent conductive oxide (TCO) which is AZO thin film was prepared by controlling pulse frequency at 100 Hz to 900 Hz using high-power impulse magnetron sputtering (HiPIMS). All samples were deposited on silicon (100) and glass slide substrates which the thickness was kept constant at 400 nm. The surface morphology was investigated by field-emission scanning electron microscope (FE-SEM), crystallinity by Grazing Incidence X-ray Diffraction (GI-XRD), optical transparency by UV-Vis-NIR spectrophotometry, and electrical properties using Hall effect instrument. It was found that the AZO films exhibited dense columnar structure. The GI-XRD patterns of AZO films demonstrated the crystal growth direction …

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Green Production Of Simultaneous Coloration And Functional Finishing On Hemp Textiles Through Dyeing With Diospyros Mollis Griff. Extract, Pisutsaran Chitichotpanya, Nattaya Vuthiganond, Pimnara Chutasen, Thitirat Inprasit Jan 2023

Green Production Of Simultaneous Coloration And Functional Finishing On Hemp Textiles Through Dyeing With Diospyros Mollis Griff. Extract, Pisutsaran Chitichotpanya, Nattaya Vuthiganond, Pimnara Chutasen, Thitirat Inprasit

Journal of Metals, Materials and Minerals

Nowadays, there is a rise in the production of eco-friendly, value-added textiles from natural substances. Some plant extracts can simultaneously dye and impart functionalities to textile fibers. The main goal of this study was the development of anti-UV and antibacterial hemp fabrics through dyeing with aqueous extracts obtained from Diospyros mollis Griff. Fruits without using any hazardous chemicals. Response surface methodology (RSM) was used to optimize the dyeing process and evaluate parameter interactions. The optimal pH, dyeing concentration, dyeing temperature, and mordant concentration were 4, 200 %owf, 92°C, and 5.4 %owf, respectively. The dyed fabrics were evaluated for coloration properties …

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Ballistic Performance Of Composite Armor Impacted By 7.62 Mm Armor Projectile, Apichart Jinnapat, Patchayapon Doungkom, Kritkeaw Somton, Kannigar Dateraksa Jan 2023

Ballistic Performance Of Composite Armor Impacted By 7.62 Mm Armor Projectile, Apichart Jinnapat, Patchayapon Doungkom, Kritkeaw Somton, Kannigar Dateraksa

Journal of Metals, Materials and Minerals

The purpose of this study is to investigate the effectiveness of composite armor against 7.62 mm ballistic threats. A sandwich panel construction consisting of a 96% alumina ceramic strike face, an annealed aluminum alloy 7075 cubic lattice sandwich panel, and a thin aluminum backing plate were used to create hard armor. The ballistic test based on NIJ standard level III was performed using 7.62 mm × 51 mm NATO projectiles at an impact velocity of 847 ± 9.1 m∙s-1. The influences of the alumina strike face panel with thicknesses of 7, 10, and 14 mm on the ballistic performance were …

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Feasibility Study Of Coconut Shell Biochar Production Using Community-Scale Biochar Kiln, Uraiwan Pongsa, Pasuree Lumsakul, Orajit Jamesang, Prasan Saengkhiao, Phoometh Sangrayub, Wichai Pumchan Jan 2023

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. …

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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 …

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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 …

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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 …

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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 …

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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. …

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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 …

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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, …

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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 …

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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 …

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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 …

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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 …

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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 …

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