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2022

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Articles 166411 - 166440 of 167855

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Low-Dose Interleukin-2 Reverses Chronic Migraine-Related Sensitizations Through Peripheral Interleukin-10 And Transforming Growth Factor Beta-1 Signaling, Zhaohua Guo, Jintao Zhang, Xuemei Liu, Jacqueline Unsinger, Richard S. Hotchkiss, Yu-Qing Cao Jan 2022

Low-Dose Interleukin-2 Reverses Chronic Migraine-Related Sensitizations Through Peripheral Interleukin-10 And Transforming Growth Factor Beta-1 Signaling, Zhaohua Guo, Jintao Zhang, Xuemei Liu, Jacqueline Unsinger, Richard S. Hotchkiss, Yu-Qing Cao

2020-Current year OA Pubs

Low-dose interleukin-2 (LD-IL-2) treatment has been shown to effectively reverse chronic migraine-related behaviors and the sensitization of trigeminal ganglion (TG) neurons through expansion and activation of peripheral regulatory T cells (Tregs) in mice. In this study, we investigated the molecular mechanisms underlying the effects of LD-IL-2 and Treg cells. LD-IL-2 treatment increases the production of cytokines interleukin-10 (IL-10) and transforming growth factor beta-1 (TGFβ1) in T cells, especially Treg cells, suggesting that they may mediate the therapeutic effect of LD-IL-2. Indeed, neutralizing antibodies against either IL-10 or TGFβ completely blocked the effects of LD-IL-2 on the facial mechanical hypersensitivity as …

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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

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

Journal of Metals, Materials and Minerals

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

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The Finished Polyester Fabric With Hot Nh4oh Pretreatment And Mixed Zno-Zn(Oh)2 Nanoparticles For Hydrophobic Property, Samroeng Narakaew, Sittipong Au-Pree, Wipanoot Baison, Siwat Thungprasert, Itsariya Wattalo, Pranpreeya Jaipor, Theeraporn Promanan, Sukee Sukdee, Pakorn Santakij, Chainet Chanogkun, Kanjana Ruttanateerawichien, Aphiruk Chaisena, Pattama Apichai, Phiphop Narakaew Jan 2022

The Finished Polyester Fabric With Hot Nh4oh Pretreatment And Mixed Zno-Zn(Oh)2 Nanoparticles For Hydrophobic Property, Samroeng Narakaew, Sittipong Au-Pree, Wipanoot Baison, Siwat Thungprasert, Itsariya Wattalo, Pranpreeya Jaipor, Theeraporn Promanan, Sukee Sukdee, Pakorn Santakij, Chainet Chanogkun, Kanjana Ruttanateerawichien, Aphiruk Chaisena, Pattama Apichai, Phiphop Narakaew

Journal of Metals, Materials and Minerals

This work aims to modify the hydrophobic coated polyester fabrics using 2%w/v ammonium hydroxide (NH4OH) at 90℃ prior and subsequently dipped in two difference aqueous zinc solution batchs containing 0.6%w/v zinc precursors with/without starch and NH4OH, finally dehydration, and characterized by the attenuated total reflection - Fourier transform Infrared (ATR-FTIR) and Raman spectroscopy (Raman), X-ray diffraction (XRD), Field emission scanning electron microscope (FE-SEM), Energy dipersive spectrometry (EDX), and Water contact angle (WCA) of 10 mL dropping at 23℃ and humidity of 63%. Raman spectra and XRD patterns results showed e-zinc hydroxide (e-Zn(OH)2), zinc oxide nanoparticle (ZnO NP) and ZnO-starch nanocomposite …

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Epoxidized Natural Rubber/Silane Modified Silica Nanocomposites Prepared In Latex Stage, Supat Moolsin, Duangkamon Sawangkan Jan 2022

Epoxidized Natural Rubber/Silane Modified Silica Nanocomposites Prepared In Latex Stage, Supat Moolsin, Duangkamon Sawangkan

Journal of Metals, Materials and Minerals

Epoxidized natural rubber (ENR) was synthesized from natural rubber (NR) latex via in situ epoxidation using HCOOH and H2O2. The prepared ENR with 22 mol% epoxidation (ENR-22) was reinforced with silane modified silica (SMS) nanoparticles with different SMS loading in latex stage. The tensile properties, thermal stability, oil resistance and morphology of the ENR-22/SMS nanocomposites were investigated. The tensile strength was improved significantly and gained the maximum point at 7.5 phr SMS content. The thermogravimetric analysis showed an increased initial degradation temperature with the addition of SMS, suggesting higher thermal stability of the nanocomposites. The oil resistance of ENR-22/SMS nanocomposites …

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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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Use Of Oil Palm Frond Waste To Reinforce Poly(Lactic Acid) Based Composites With The Improvement Of Interfacial Adhesion By Alkali Treatment, Nattakarn Hongsriphan, Jidapa Subsanga, Pimpisa Suebsai, Sunisa Sitthipong, Pajaera Patanathabutr Jan 2022

Use Of Oil Palm Frond Waste To Reinforce Poly(Lactic Acid) Based Composites With The Improvement Of Interfacial Adhesion By Alkali Treatment, Nattakarn Hongsriphan, Jidapa Subsanga, Pimpisa Suebsai, Sunisa Sitthipong, Pajaera Patanathabutr

Journal of Metals, Materials and Minerals

Oil palm frond waste was used as reinforcing fibers for biodegradable poly(lactic acid) or PLA in order to produce green composites that increased the value of agricultural waste. The alkali-treated oil palm frond (OPF) fibers of 30 wt% or 40 wt% were compounded with PLA and moulded into specimens. The alkali treatment was 0 wt%, 1 wt%, 3 wt%, and 5 wt% of the fibers for compatibility improvement with PLA matrix. It was found that the alkali-treated PLA/OPF composites adding 30 wt% and 40 wt% had the flexural modulus to be about 55% and 75% higher than those without the …

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Design, Development And Characterization Of A Mid-Frequency (35 Khz) Tonpilz Transducer Array From 0.675pmn-0.325pt Piezoceramics, Merve Nur Çiftçi, Berk Değirmenci, Irem Böbrek, Sedat Alkoy, Aykut Aykaç, Muhammet Boz, Ayşe Berksoy-Yavuz, Ezgi Yalcin, Namik K. Gozuacik, Ebru Menşur Jan 2022

Design, Development And Characterization Of A Mid-Frequency (35 Khz) Tonpilz Transducer Array From 0.675pmn-0.325pt Piezoceramics, Merve Nur Çiftçi, Berk Değirmenci, Irem Böbrek, Sedat Alkoy, Aykut Aykaç, Muhammet Boz, Ayşe Berksoy-Yavuz, Ezgi Yalcin, Namik K. Gozuacik, Ebru Menşur

Journal of Metals, Materials and Minerals

A mid-frequency tonpilz transducer array was designed and analyzed by finite element method using commercial ATILA code and constructed using piezoceramic rings with lead magnesium niobate (PMN)-lead titanate (PT) composition. The morphotropic phase boundary (MPB) 0.675Pb(Mg1/3Nb2/3)O3-0.325PbTiO3 composition was chosen to obtain higher performance from the transducer due to the superior dielectric and electromechanical properties of the MPB compositions. A pure perovskite phase was obtained from the ceramics. Piezoelectric charge coefficient (d33) was measured as 435 pC×N-1. Single tonpilz element and an array consisting of 7-unit array were constructed and later potted in polyurethane for underwater measurements. A second array was …

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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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Amino-Containing Polymer-Coated Magnetite Nanoparticles As Nano-Adsorbents For Bisphenol A: Synthesis, Kinetic And Thermodynamic Study, Jakkrit Tummachote, Metha Rutnakornpituk, Duangdao Channei, Filip Kielar, Boonjira Rutnakornpituk Jan 2022

Amino-Containing Polymer-Coated Magnetite Nanoparticles As Nano-Adsorbents For Bisphenol A: Synthesis, Kinetic And Thermodynamic Study, Jakkrit Tummachote, Metha Rutnakornpituk, Duangdao Channei, Filip Kielar, Boonjira Rutnakornpituk

Journal of Metals, Materials and Minerals

Magnetite nanoparticles coated with poly(dimethyl aminoethyl methacrylate) (PDMAEMA@MNPs) and their quarternized form (PQDMAEMA@MNPs) were successfully synthesized and used as nano-adsorbents for bisphenol A (BPA). The particles were spherical with the average particle size between 10 and 20 nm in diameter with a moderate degree of nanoclustering (ca.150-200 particles/cluster). In terms of adsorption properties, the PDMAEMA@MNPs exhibited a higher BPA adsorption capacity (1.05 mg/g MNP at pH 9) than the quaternized form (0.50 mg/g MNP at pH 9). Equilibrium isotherm, kinetic, and thermodynamic characteristics of BPA adsorption on the PDMAEMA@MNPs were investigated. It was found that the BPA adsorption …

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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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Elastic Properties Of Boro-Tellurite Glasses Doped With Europium Oxide, Chinnappareddy Devaraja, G. V. Jagadeesha Gowda, Bheemaiah Eraiah, G. K. Narasihma Murthy Jan 2022

Elastic Properties Of Boro-Tellurite Glasses Doped With Europium Oxide, Chinnappareddy Devaraja, G. V. Jagadeesha Gowda, Bheemaiah Eraiah, G. K. Narasihma Murthy

Journal of Metals, Materials and Minerals

The glass series of xEu2O3-5PbO-25TeO2-(70-x) B2O3, where x=0.1 mol% to 0.6 mol% were prepared by employing the conventional melt quenching method. The non-crystallinity of prepared BTE glasses was examined by the X-ray diffraction method. The very important mechanical properties such as elastic moduli, Debye temperature, Poisson’s ratio, fractional bond connectivity, softening temperature, acoustic impedance, and the thermal expansion coefficient of the BTE glasses have been studied by measuring ultrasonic velocity. The experimental results indicate that the calculated parameters strongly depend on increasing Eu2O3 concentration. The elastic moduli of the prepared samples were found to decrease with Eu2O3 concentration and this …

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Enhanced Photocatalytic Activity Of Zno Nanostructures Deposited On Mesh Through Electrochemical Deposition And Thermal Oxidation, Chantana Aiempanakit, Thongchai Phantaporn, Kamon Aiempanakit Jan 2022

Enhanced Photocatalytic Activity Of Zno Nanostructures Deposited On Mesh Through Electrochemical Deposition And Thermal Oxidation, Chantana Aiempanakit, Thongchai Phantaporn, Kamon Aiempanakit

Journal of Metals, Materials and Minerals

This article reported that the properties of zinc oxide (ZnO) nanostructures were modified by the thermal oxidation process at different temperatures in the range of 200℃ to 600℃ for 1 h. The Zn films were deposited on a stainless steel mesh by using the electrochemical deposition technique. The elemental composition of Zn and O was exhibited via energy-dispersed X-ray spectroscopy in which the atomic ratio of O/Zn increased with the increase of oxidation temperature. The results showed that oxidation temperature has a significant effect on the morphological and crystal structure. The nanosheet structure of the as-deposited film transferred to the …

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Brazilein Modified Zinc Oxide Nanorods With Enhanced Visible Light-Responsive Photocatalytic Efficiency, Montri Aiempanakit, Penpicha Sudjai, Kittiyaporn Singsumphan, Sakchai Laksee, Cheewita Suwanchawalit Jan 2022

Brazilein Modified Zinc Oxide Nanorods With Enhanced Visible Light-Responsive Photocatalytic Efficiency, Montri Aiempanakit, Penpicha Sudjai, Kittiyaporn Singsumphan, Sakchai Laksee, Cheewita Suwanchawalit

Journal of Metals, Materials and Minerals

Photocatalytic efficiency of ZnO nanorods has been investigated with respect to the concentration of brazilein. Brazilein modified ZnO nanorods were prepared by an impregnation process with 1.0%w/v, 2.5%w/v, and 5.0%w/v of brazilein solution.  In order to correlate the variation in concentration distributions and photocatalytic performance, the phase composition, optical properties, and photo-catalytic activities of brazilein modified ZnO nanorods prepared with different brazilein concentrations have been investigated and compared to an unmodified ZnO nanorods. The photocatalytic properties were measured in terms of indigo carmine degradation under visible light irradiation. It was found that ZnO nanorods with the highest visible light-responsive photocatalytic …

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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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Extraction Of Molybdenum From A Spent Hds Catalyst Using Alkali Leaching Reagent, Chatisa Kansomket, Piamsak Laokhen, Tanongsak Yingnakorn, Tapany Patcharawit, Sakhob Khumkoa Jan 2022

Extraction Of Molybdenum From A Spent Hds Catalyst Using Alkali Leaching Reagent, Chatisa Kansomket, Piamsak Laokhen, Tanongsak Yingnakorn, Tapany Patcharawit, Sakhob Khumkoa

Journal of Metals, Materials and Minerals

This research investigated extraction of molybdenum from spent hydrodesulfurization (HDS) catalyst used in petroleum refinery. The spent HDS catalyst still however contains significant amounts of valuable metals such as molybdenum and nickel for example, thereby recovery of such metals are of great interest. Pyro-hydrometallurgical process was utilized in this research to selectively extract molybdenum from the spent HDS catalyst using alkali leaching reagent. The process start from calcination of spent HDS catalyst, alkali leaching using sodium carbonate, purification by carbon adsorption-desorption, precipitation of ammonium molybdate and finally calcination to give molybdenum trioxide (MoO3) as the final recycling product. Effects of …

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