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Articles 301 - 330 of 3176

Full-Text Articles in Engineering Science and Materials

Antibacterial, Self-Adhesive Guar Gum/Polyvinyl Alcohol/Tannic Acid Conductive Hydrogels For Flexible Strain Sensors, Noppanan Putdon, Somnuk Theerakulpistut, Rawit Jittham, Pornnapa Kasemsiri Jan 2025

Antibacterial, Self-Adhesive Guar Gum/Polyvinyl Alcohol/Tannic Acid Conductive Hydrogels For Flexible Strain Sensors, Noppanan Putdon, Somnuk Theerakulpistut, Rawit Jittham, Pornnapa Kasemsiri

Journal of Metals, Materials and Minerals

In this research, a multifunctional strain sensor with antibacterial properties and self-adhesion capabilities was developed using guar gum (GG), polyvinyl alcohol (PVA), and tannic acid (TA). The incorporation of TA into GG-PVA hydrogel-based strain sensors was investigated to evaluate its effects on mechanical and electrical properties, self-adhesion, and antibacterial activities. The anti-bacterial activities against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were enhanced with the increasing content of TA. The adhesive strength was observed in the range of 1.20 ± 0.10 kPa to 5.05 ± 0.23 kPa, and the values tended to increase as TA content increased. The …

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Mechanochemical Synthesis Of Ni(Ii)-Tptz Complexes With Co-Ligands: Spectroscopy, Dft, And Biological Studies, Deepak Senapati, Anulipsa Priyadarshini, Debadutta Samal, P. Ramesh Babu, Satyanarayan Sahoo, Narayan Chandra Bera, Raghabendra Samantaray, Jagannath Panda, Rojalin Sahu Jan 2025

Mechanochemical Synthesis Of Ni(Ii)-Tptz Complexes With Co-Ligands: Spectroscopy, Dft, And Biological Studies, Deepak Senapati, Anulipsa Priyadarshini, Debadutta Samal, P. Ramesh Babu, Satyanarayan Sahoo, Narayan Chandra Bera, Raghabendra Samantaray, Jagannath Panda, Rojalin Sahu

Journal of Metals, Materials and Minerals

New mixed-ligand Ni(II) complexes [Ni(tptz)(1,10-phen)] (1), [Ni(tptz)(2-Mimd)2] (2), and [Ni(tptz)Imd)2] (3) were synthesized via a green, solvent-free mechanochemical approach using ball milling. The primary ligand used was 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz), with secondary ligands being 1,10-phenanthroline, 2-methyl imidazole, and imidazole, respectively. Structural characterization by IR, UV-Visible, photoluminescence spectroscopy, and powder X-ray diffraction, supported by DFT calculations, revealed a distorted square planar geometry for complex 1 and distorted tetrahedral geometries for complex-2 and complex-3. Notably, bathochromic shifts in the UV-Vis spectra confirm metal-ligand charge transfer transitions and extended π-delocalization. Powder XRD analysis determined average crystallite sizes of 17.86 nm (1), 25 nm (2), …

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Liquid-Liquid Extraction Of Nd(Iii) Using [P66614][Cy272] Ionic Liquid, Prasanjit Das, Kali Sanjay, Niharbala Devi Jan 2025

Liquid-Liquid Extraction Of Nd(Iii) Using [P66614][Cy272] Ionic Liquid, Prasanjit Das, Kali Sanjay, Niharbala Devi

Journal of Metals, Materials and Minerals

This study explores the extraction of Nd(III) from synthetic solutions using the ionic liquid [P66614] [Cy272]. Key extraction parameters, including the effect of phase contact time, initial pH, salting-out agents, extractant concentration, and temperature, were systematically optimized. Results revealed that a phase contact time of 15 min, an initial pH of 2.14, and 0.2 mol∙L‒1 NaCl as a salting-out agent and extractant concentration of 0.015 mol∙L‒1 [P66614][Cy272], achieved maximum extraction efficiency of 99.7%. Thermodynamic analysis confirmed the process is to be exothermic, spontaneous, and entropy-driven, highlighting the strong complexation between Nd(III) and the ionic liquid [P66614][Cy272]. Stripping tests revealed that …

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Pulsed Arc Additive Manufacturing Of A Functionally Graded Er2209 Duplex Stainless Steel And Hsla-100 Structure: Morphology, Characterization, And Mechanical Performance, Stevens G. Hill Jr Jan 2025

Pulsed Arc Additive Manufacturing Of A Functionally Graded Er2209 Duplex Stainless Steel And Hsla-100 Structure: Morphology, Characterization, And Mechanical Performance, Stevens G. Hill Jr

College of Graduate Studies: Theses & Dissertations

Wire arc additive manufacturing is a process well suited to the efficient production of large structures. Duplex stainless steel exhibits high corrosion resistance and good strength which can be highly beneficial for industrial use. However, its use is limited due to its cost and complexity in controlling microstructure to achieve desired properties. In many cases, it can be highly beneficial to manufacture a component which uses specialty steel grades such as duplex stainless steel only where necessary, and utilizes more affordable, commonly available steels for reinforcement or bulk structural support. A functionally graded material satisfies these requirements by providing a …

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Controlling Nitrogen Pickup During Induction Melting Of Ultrahigh-Strength Cr-Ni-Mo-V Steels, Kingsley T. Amatanweze, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field Jan 2025

Controlling Nitrogen Pickup During Induction Melting Of Ultrahigh-Strength Cr-Ni-Mo-V Steels, Kingsley T. Amatanweze, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field

Materials Science and Engineering Faculty Research & Creative Works

Nitrogen pickup during air induction melting can result in porosity and a loss of fracture toughness in ultrahigh-strength quenched and tempered steel castings. Nitrogen atoms are easily adsorbed into liquid steel upon exposure to the air, and argon shrouding alone has limited effectiveness. Previous studies have shown that proper charge sequencing and maintaining a high amount of dissolved oxygen in the melt prior to tapping and deoxidation can limit nitrogen pickup in the melt. In the current study, the effect of melt practice and charging procedure on nitrogen pickup was studied as a function of hold time in a series …

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Parametric Analysis Of Water Jet Descaling Efficiency Of Reheated Continuously Cast Thin Slab, Tochukwu P. Ojiako, Mario F. Buchely, Simon Lekakh, Ronald J. O'Malley, Richard Osei, Taha Tayebali Jan 2025

Parametric Analysis Of Water Jet Descaling Efficiency Of Reheated Continuously Cast Thin Slab, Tochukwu P. Ojiako, Mario F. Buchely, Simon Lekakh, Ronald J. O'Malley, Richard Osei, Taha Tayebali

Materials Science and Engineering Faculty Research & Creative Works

Efficient oxide scale removal is critical for maintaining surface quality and process efficiency in steel manufacturing. This study optimizes water jet descaling by evaluating the performance of flat and rotary jet nozzles under varying process parameters. Using a combined approach of experimental analysis and computational fluid dynamics, it investigates the influence of pressure (138–275 bar), lead angle (0°, 15°, 25°), working distance (50–100 mm), and spray angle (15°–25°) on descaling efficiency. Findings indicate that flat jet nozzles achieve superior performance at short working distances due to concentrated impact forces, while rotary jet nozzles sustain efficiency over extended distances through dynamic …

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Effect Of Gating Design On Filling And Inclusion Control In An Al-Killed Cr-Mo-Ni Steel, Kingsley T. Amatanweze, Koushik Balasubramanian, Soumava Chakraborty, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field, Krista R. Limmer, Katherine M. Sebeck Jan 2025

Effect Of Gating Design On Filling And Inclusion Control In An Al-Killed Cr-Mo-Ni Steel, Kingsley T. Amatanweze, Koushik Balasubramanian, Soumava Chakraborty, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field, Krista R. Limmer, Katherine M. Sebeck

Materials Science and Engineering Faculty Research & Creative Works

The effect of gating system design on the inclusion population and size distribution in an aluminum-killed low-alloy advanced high strength steel casting was studied. A mold with four different gating systems: pressurized and non-pressurized with side risers, naturally pressurized with a side riser, and naturally pressurized with a top riser, was designed using computational fluid dynamics and solidification software. The design allowed inclusion populations in castings produced with each gating system to be compared during the same pouring event. Samples taken from different positions just below the top surface of each casting were analyzed using an SEM/EDS system with automated …

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Effects Of Soil Properties On Cp Performance, Cecilia Segretario Jan 2025

Effects Of Soil Properties On Cp Performance, Cecilia Segretario

Williams Honors College, Honors Research Projects

This research aims to evaluate the affect of various soil properties on the effectiveness of cathodic protection (CP) in preventing underground pipeline corrosion. Metal coupons of common pipeline materials with applied CP will be mounted in several separate controlled soil environments to manipulate real world underground corrosion scenarios. Each soil environment will have different physical properties by mixing the soil with a prepared chemical solution. The physical properties to be evaluated include pH, resistivity, and moisture content. At the end of a corrosion duration, weight loss method will be used to evaluate the corrosion rate over that period. Additionally, the …

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Design And Development Of A Rapid Tensile Quench Rig, Tyler Jewell, Justin Naylor Jan 2025

Design And Development Of A Rapid Tensile Quench Rig, Tyler Jewell, Justin Naylor

Williams Honors College, Honors Research Projects

This report outlines the design process and implantation of a tensile quenching rig that incorporated forced convection and a frequency generator. When any metal is quenched, a vapor barrier forms around it. When this happens, it limits the heat flux that may occur until the barrier turns into just nucleate boiling. The vapor barrier acts as an insulator and causes the heat flux to fluctuate, causing uneven hardening which would limit the use of some materials. To combat this effect, we are trying to use forced convection, and something new, which is adding high frequency waves into the quenching process. …

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Enhancing Acetone Gas Sensor Performance With Cobalt Oxide Doping In Lafeo3 Prepared By Co-Precipitation, Andhy Setiawan, Farah Aprisza Sheelmarevaa, Muhamad Taufik Ulhakim, Dani Gustaman Syarif, Endi Suhendi Jan 2025

Enhancing Acetone Gas Sensor Performance With Cobalt Oxide Doping In Lafeo3 Prepared By Co-Precipitation, Andhy Setiawan, Farah Aprisza Sheelmarevaa, Muhamad Taufik Ulhakim, Dani Gustaman Syarif, Endi Suhendi

Journal of Metals, Materials and Minerals

Semiconductor-based gas sensors frequently encounter difficulties in attaining optimal performance due to challenges such as temporal stability and low sensitivity, stemming from their insulating properties at room temperature. To address these limitations, this study proposes a novel approach by preparing cobalt-doped LaFeO3 (LaFeO3-Co) using the co-precipitation method, with doping concentrations of 2.5 mol% and 5.0 mol%. The acetone gas sensors were fabricated into thick films via the screen-printing technique, and their performance was thoroughly characterized. X-ray diffraction (XRD) analysis confirmed a cubic crystal structure, and the addition of 2.5 mol% cobalt was found to reduce the particle size of LaFeO3, …

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Enhanced Photocatalytic Reduction Of Cr(Vi) Under Visible Light A Magnetically Separable Tio2-Fe/Fe3o4 Photocatalyst Prepared From Iron Rusty Waste, Khoirunisa Khoirunisa, Novianti Dwi Lestari, Endang Tri Wahyuni, Taufik Abdillah Natsir Jan 2025

Enhanced Photocatalytic Reduction Of Cr(Vi) Under Visible Light A Magnetically Separable Tio2-Fe/Fe3o4 Photocatalyst Prepared From Iron Rusty Waste, Khoirunisa Khoirunisa, Novianti Dwi Lestari, Endang Tri Wahyuni, Taufik Abdillah Natsir

Journal of Metals, Materials and Minerals

This research deals with enhancing the visible activity and generating the magnetic property of TiO2 by Fe doping and Fe3O4 impregnation respectively, using rusty iron waste as Fe source. The prepared TiO2-Fe/Fe3O4 photocatalysts were characterized by SR-UV/Visible, FTIR, XRD, and SEM-EDX instruments. The resulting photocatalysts are responsive to visible light and can be separated magnetically and used for photoreduction of Cr (VI) ions. In the photoreduction of Cr(VI) over TiO2-Fe/Fe3O4 photo-catalysts with various amounts of Fe dopant and alteration of Fe3O4 fraction, the photocatalyst mass, irradiation time, and solution pH were optimized. The research results assign that doping Fe to …

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Hydroxyl Combined With Nitrogen On Biomass Carbon Promotes The Electrocatalytic H2o2 Selectivity, Jiabi Jiang, Danni Deng, Yuchao Wang, Yingbi Chen, Yu Bai, Meng Wang, Xiang Xiong, Yongpeng Lei Jan 2025

Hydroxyl Combined With Nitrogen On Biomass Carbon Promotes The Electrocatalytic H2o2 Selectivity, Jiabi Jiang, Danni Deng, Yuchao Wang, Yingbi Chen, Yu Bai, Meng Wang, Xiang Xiong, Yongpeng Lei

Journal of Metals, Materials and Minerals

Elevating the selectivity of two-electron oxygen reduction reaction (2e‒ ORR) is challenging. Herein, the hydroxyl combined with nitrogen on biomass carbon exhibits a high H2O2 selectivity over a wide potential range of 0 V to 0.5 V vs. RHE, which is nearly 97% at 0.3 V vs. RHE. The combination of hydroxyl and nitrogen improves the adsorption and desorption of intermediates, finally changing the reaction pathway and promoting the selectivity of 2e‒ ORR. The Faradaic efficiency (FE) reaches 98% at 0.3 V vs. RHE. Furthermore, the typical organic pollutants were degraded on site in flow cell. This work illustrates the …

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Elucidating The Corrosion Of Carbon Steel In Hybrid Monoethanolamine Solutions Containing Methanol Or N-Methyl-2-Pyrrolidone, Pui Yee Tan, Lian See Tan, Swee Pin Yeap, Peck Loo Kiew, Mee Kee Wong, Azmi Mohd Shariff Jan 2025

Elucidating The Corrosion Of Carbon Steel In Hybrid Monoethanolamine Solutions Containing Methanol Or N-Methyl-2-Pyrrolidone, Pui Yee Tan, Lian See Tan, Swee Pin Yeap, Peck Loo Kiew, Mee Kee Wong, Azmi Mohd Shariff

Journal of Metals, Materials and Minerals

Corrosion has been a persistent issue in carbon dioxide (CO2) absorption unit that needs to be resolved in order to prolong the life span of the absorber unit. In this regard, understanding the corrosion behaviour, particularly in hybrid monoethanolamine (MEA) solutions, is crucial. This study aims to give detail information on the role of different process parameters, encompassing types of amine solution, temperature, and CO2 loading on the corrosion behaviour of carbon steel in system containing hybrid solution of monoethanolamine (MEA) and methanol (MeOH) or N-methyl-2-pyrrolidone (NMP). Here, the corrosion extent of the carbon steel was evaluated using gravimetric experiments. …

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High-Binding Affinity Nanobody Against Sars-Cov-2 Xbb.1.5: Computational-Based Protein Engineering, Phoomintara Longsompurana, Napat Kongtaworn, Rungtiva P. Poo-Arporn, Thanyada Rungrotmongkol Jan 2025

High-Binding Affinity Nanobody Against Sars-Cov-2 Xbb.1.5: Computational-Based Protein Engineering, Phoomintara Longsompurana, Napat Kongtaworn, Rungtiva P. Poo-Arporn, Thanyada Rungrotmongkol

Journal of Metals, Materials and Minerals

The emergence of the SARS-CoV-2 variant XBB.1.5 has triggered a global health crisis by enhancing viral entry into cells via its spike protein. This study addresses the urgent need to develop neutralizing nanobodies (Nbs) to counteract the SARS-CoV-2 virus. Our aim was to identify a lead Nb and enhance its binding affinity to the receptor-binding motif (RBM) on the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein (S-protein) using computational methods. A total of 29 Nbs were screened against the XBB.1.5 RBD using the HDOCK server to select a lead Nb. This investigation revealed that Nb_7KGK exhibited the highest binding …

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Electrochemical Study Of Zn-Fe Alloy Coatings On Mild Steel For Automotive Applications, Ramesh Bhat, A. Chitharanjan Hegde Jan 2025

Electrochemical Study Of Zn-Fe Alloy Coatings On Mild Steel For Automotive Applications, Ramesh Bhat, A. Chitharanjan Hegde

Journal of Metals, Materials and Minerals

This study investigates the electrochemical behavior of Zn-Fe alloy deposited on mild steel (MS) substrates for automotive applications. The electrodeposition of a Zn-Fe alloy onto MS using an acid chloride bath, with 1,2,4-Triazole as an additive to enhance the uniformity of the deposit. The hull cell method was used to optimize the bath composition and operating conditions. The coatings were produced using electrodeposition at varying current densities, with 3 A∙dm‒2 identified as the optimal current density (CD) for achieving uniform coatings. The microstructural properties, including crystallite size and micro-strain, were analyzed using X-ray diffraction (XRD) and Williamson-Hall (W-H) analysis, revealing …

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Influence Of The Casting Processes And Aging Times On The Microstructure And Hardness Of Alsi12 Cu Cast Alloys, Said Beroual, Pascal Paillard, Yann Borjon-Piron Jan 2025

Influence Of The Casting Processes And Aging Times On The Microstructure And Hardness Of Alsi12 Cu Cast Alloys, Said Beroual, Pascal Paillard, Yann Borjon-Piron

Journal of Metals, Materials and Minerals

The present study investigated the effects of the casting processes and aging times on the micro-structure and hardness of commercial AlSi12Cu alloys. The primary goal was to assess how various aging times affect the maximum hardness of the alloy and to evaluate the influence of cooling rates on hardness values obtained from sand casting (SC) and High-pressure die casting (HPDC). For both casting alloys, the solution heat treatment was performed at 540℃, followed by quenching. The alloys were then aged at 180℃ for various durations, ranging from 10 min to 50 h. The results reveal significant microstructural changes in the …

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Photodegradation Of Malachite Green Using 2d G-C3n5 Nanosheet: A Promising Metal Free Catalyst, Sonali Biswal, Swayam Aryam Behera, Asima Subhadarshini, P. Ganga Raju Achary, Binita Nanda Jan 2025

Photodegradation Of Malachite Green Using 2d G-C3n5 Nanosheet: A Promising Metal Free Catalyst, Sonali Biswal, Swayam Aryam Behera, Asima Subhadarshini, P. Ganga Raju Achary, Binita Nanda

Journal of Metals, Materials and Minerals

Environmental issues have become more serious these days due to the growth of modern industries. The paper and textile industries, in particular, were heavily dependent on the printing and discharge of dye, which constantly leaked into the water ecology and constituted a serious risk to public health. Organic wastewater treatment and remediation for its associated risks have received a lot of attention lately. This work explored the potential of the g-C3N5 nanostructure as a novel photocatalyst for malachite green degradation in aqueous solution while exposed to visible light. The nanocomposite was fabricated through an ultrasonicate-assisted technique. A number of analysis …

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Regulating Copx/Co Heterostructures For Enhanced Electrocatalytic Activity Toward Hydrazine Oxidation Reaction, Qinquan Lin, Rui Zhang, Changli Yan, Qizhao Hu, Shangbin Sang, Qiumei Wu, Kaiyu Liu, Hongtao Liu Jan 2025

Regulating Copx/Co Heterostructures For Enhanced Electrocatalytic Activity Toward Hydrazine Oxidation Reaction, Qinquan Lin, Rui Zhang, Changli Yan, Qizhao Hu, Shangbin Sang, Qiumei Wu, Kaiyu Liu, Hongtao Liu

Journal of Metals, Materials and Minerals

Hydrazine hydrate (N2H4∙H2O) is considered an ideal fuel for fuel cells. Constructing a cobalt phosphide/cobalt (CoPx/Co) heterostructure can achieve efficient electrocatalytic activity for hydrazine oxidation reaction. Traditional strategies for constructing CoPx/Co heterostructures took less consideration on the exposure of the active sites. In this study, 3D nanoflower-like nano CoPx/Co heterostructures with highly exposed active sites were obtained on a nickel foam (NF) through a dual-component phosphating strategy, i.e., regulating the relative content of Co and Co(OH)2 with cathodic current density and utilizing the differences in their phosphating behaviors. The potential at 100 mA∙cm‒2 and Tafel slope of the optimized CoPx/Co(375)@NF …

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Facile Synthesis Of Bamno3-Zro2 Composite: A Step Towards The Photocatalytic Degradation Of Organic Dye, Kirttimayee Mohanta, Swayam Aryam Behera, Binita Nanda, P. Ganga Raju Achary Jan 2025

Facile Synthesis Of Bamno3-Zro2 Composite: A Step Towards The Photocatalytic Degradation Of Organic Dye, Kirttimayee Mohanta, Swayam Aryam Behera, Binita Nanda, P. Ganga Raju Achary

Journal of Metals, Materials and Minerals

Environmental contamination by synthetic dyes, particularly Methylene Blue (MB), presents a significant threat to aquatic ecosystems and human health due to their chemical stability and toxicity. This study investigates the photocatalytic degradation of MB using a BaMnO3:ZrO2 composite synthesized in a 1:2 ratio via a straightforward wet-chemical method. Structural and optical characterizations were performed using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and Ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS). The composite exhibited a reduced bandgap of 2.88 eV and uniform nanoscale morphology, both favorable for visible-light-driven photocatalysis. Under visible-light irradiation, the catalyst achieved 89% degradation efficiency within …

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The Effects Of Graphene Nanoplatelets And Microcrystalline Cellulose On The Mechanical Properties Of Fiberglass And Carbon Fiber Composites, Duangjai Srisamut, Nathawat Poopakdee, Warut Thammawichai Jan 2025

The Effects Of Graphene Nanoplatelets And Microcrystalline Cellulose On The Mechanical Properties Of Fiberglass And Carbon Fiber Composites, Duangjai Srisamut, Nathawat Poopakdee, Warut Thammawichai

Journal of Metals, Materials and Minerals

This study investigated how graphene nanoplatelets (GNP) and microcrystalline cellulose (MCC) affect the mechanical properties of epoxy (EP), carbon fiber (CF), and fiberglass (FG) composites. The tensile and flexural properties of GNP-EP and MCC-EP of  varying reinforcement concentrations were examined. Results indicated significant improvements on tensile and flexural properties by GNP and MCC. At 0.1 wt% GNP, tensile and flexural strengths increased by 10% and 21%, while 2.0 wt% improved flexural modulus by 65%. Similarly, 2.0 wt% MCC improved tensile strength, modulus, and flexural modulus by 11%, 11%, and 46%, respectively, and a 26% increase in flexural strength at 1.0 …

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Synthesis Temperature-Driven Enhancements In Bioi Photocatalysis: A Hydrothermal Approach, Sorawit Thueanbangyang, Kittiyaporn Singsumphan, Varunya Atimayulerd, Chutima Nakmuk, Cheewita Suwanchawalit, Montri Aiempanakit Jan 2025

Synthesis Temperature-Driven Enhancements In Bioi Photocatalysis: A Hydrothermal Approach, Sorawit Thueanbangyang, Kittiyaporn Singsumphan, Varunya Atimayulerd, Chutima Nakmuk, Cheewita Suwanchawalit, Montri Aiempanakit

Journal of Metals, Materials and Minerals

Bismuth oxyiodide (BiOI) is a promising photocatalyst for visible-light-driven environmental remediation. However, its photocatalytic efficiency is highly dependent on synthesis conditions, particularly hydrothermal temperature, which governs its structural, optical, and electronic properties. In this study, BiOI was synthesized via a hydrothermal method at temperatures of 120℃, 150℃, 180℃, and 210℃ to investigate the effect of temperature on its photocatalytic performance systematically. Comprehensive characterizations, including X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence and photocatalytic degradation studies, were conducted to analyze crystallinity, morphology, band structure and charge transfer properties. The results …

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Bagasse Lignin For Single-Used Food Packaging Applications: Uv-Barrier, Antioxidant, Migration And Cytotoxicity, Pawarisa Wijaranakul, Bongkot Hararak, Wanwitoo Wanmoolee, Prapudsorn Wannid, Weerawan Laosiripojana Jan 2025

Bagasse Lignin For Single-Used Food Packaging Applications: Uv-Barrier, Antioxidant, Migration And Cytotoxicity, Pawarisa Wijaranakul, Bongkot Hararak, Wanwitoo Wanmoolee, Prapudsorn Wannid, Weerawan Laosiripojana

Journal of Metals, Materials and Minerals

This study examined PLA biocomposite films made from organosolv lignin extracted from Thai agro-waste, specifically sugarcane bagasse (BG), to assess their suitability for food packaging, focusing on their physical, thermal, optical, UV-shielding, antioxidant, and migration properties. Extracted BG-lignin exhibited free radical scavenging ability with an EC50 value of 400 µg/ml, reducing DPPH absorbance by 50%. PLA composite films with BG-lignin dosage from 0.1 to 1.0 wt.% were successfully fabricated via conventional blown film extrusion. Addition of BG-lignin at 0.5 wt.% and 1.0 wt.% to PLA films decreased UV transmittance from 90% to 30% and 12%, respectively, without compromising optical clarity. …

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Coating Of Zinc Substrates With Fluorosilane Molecules Using A Water-Treatment Technique As A Pre-Coating Procedure For The Creation Of Superhydrophobic Surfaces, Renz Ronald R. Prieto, Marvin U. Herrera Jan 2025

Coating Of Zinc Substrates With Fluorosilane Molecules Using A Water-Treatment Technique As A Pre-Coating Procedure For The Creation Of Superhydrophobic Surfaces, Renz Ronald R. Prieto, Marvin U. Herrera

Journal of Metals, Materials and Minerals

Superhydrophobic surfaces were successfully created when zinc substrates were coated with molecules with low surface energy through grafting of fluorosilane molecules. The zinc substrate underwent water-treatment technique as a pre-coating procedure to enhance the reaction sites for the grafting of fluorosilane molecules. The water contact angle of the samples went as high as 161.1° ± 0.8°. At lower fluorosilane-ethanol soaking times, water contact angles have lower values while at higher soaking time, it has higher water contact angle values. At 240 min fluorosilane-ethanol soaking time, optimum value of water contact angle was achieved. Fluorosilane molecules are widely distributed through the …

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Sulfur-Doped Carbon Dots Derived From Caffeine: A Highly Efficient Photocatalyst For Organic Dye Degradation, Ganyaporn Wongwaen, Koranut Dechsri, Praneet Opanasopit, Montri Aiempanakit, Cheewita Suwanchawalit Jan 2025

Sulfur-Doped Carbon Dots Derived From Caffeine: A Highly Efficient Photocatalyst For Organic Dye Degradation, Ganyaporn Wongwaen, Koranut Dechsri, Praneet Opanasopit, Montri Aiempanakit, Cheewita Suwanchawalit

Journal of Metals, Materials and Minerals

Sulfur-doped carbon dots (S-doped CDs) were synthesized via a solvothermal method using caffeine as a carbon precursor and sodium sulfide as a sulfur source. Characterization using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet -visible (UV-Vis) spectroscopy, and photoluminescence spectroscopy (PL) confirmed successful sulfur incorporation. TEM revealed a uniform size distribution and graphitic structures, while UV-Vis analysis showed a reduction in the bandgap from 3.29 eV to 3.10 eV, improving light absorption and charge carrier separation. The photocatalytic activity of S-doped CDs was evaluated for indigo carmine (IC) dye degradation under UV irradiation, where 2S-CDs …

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Impacts Of Calcination Temperature On The Crystallography, Granulometry And Impedance Of Licomno4, Chee Wayne Tan, Zul Hilmi Che Daud, Zainab Asus, Mohd Hasbullah Idris, Izhari Izmi Mazali, Mohd Kameil Abdul Hamid Jan 2025

Impacts Of Calcination Temperature On The Crystallography, Granulometry And Impedance Of Licomno4, Chee Wayne Tan, Zul Hilmi Che Daud, Zainab Asus, Mohd Hasbullah Idris, Izhari Izmi Mazali, Mohd Kameil Abdul Hamid

Journal of Metals, Materials and Minerals

Spinel structured lithium cobalt manganese oxide (LiCoMnO4) which exhibit reduction potential surpassing 5.0 V (vs. Li0 | Li+) was identified to be one of the prospective cathode candidates for next generation lithium-ion electrochemical systems. This article highlights the significance of calcination temperature on the crystallography of the resultant electroceramic compound as well as the corresponding response on the granulometry and impedance of LiCoMnO4. LiCoMnO4 compounds synthesised via sol-gel reaction in the first instance were converted into xerogel and subsequently subjected to facile one-step calcination protocol. Crystallography of the post-calcinated compounds were characterised via powder x-ray diffraction (XRD) technique. Temperature ranging …

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Effect Of Lanthanum Doping On Phase Transition, Piezoelectric And Energy Storage Properties Of Lead-Free 0.93(Bi0.5na0.5)Tio3‒0.07batio3 Ceramics, Pathit Premwichit, Songphop Jaila, Sasiporn Prasertpalichat Jan 2025

Effect Of Lanthanum Doping On Phase Transition, Piezoelectric And Energy Storage Properties Of Lead-Free 0.93(Bi0.5na0.5)Tio3‒0.07batio3 Ceramics, Pathit Premwichit, Songphop Jaila, Sasiporn Prasertpalichat

Journal of Metals, Materials and Minerals

In this study, lead-free (Bi0.465Na0.465Ba0.07)(1–x)LaxTiO3 (x=0.0‒0.04) ceramics were synthesized using a conventional solid-state reaction method. All samples showed a single-phase perovskite structure with pseudocubic symmetry. The dense microstructure revealed a decrease in average grain size as x increased. La3+ addition stabilized polar nanoregions (PNRs), shifting the ferroelectric to relaxor phase transition temperature (TF₋R=104℃ for x=0.0) to below room temperatures as La3+ content increased. This resulted in a transition from a rectangular to a relaxor-like thin P–E loop (x≥0.01), indicating a shift from ferro-electric (FE) to relaxor ferroelectric (RFE), which …

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Aluminium Oxide Particles-Containing Organogels For Cleaning Of Optical Glass Surfaces, Galina Vladimirovna Lyamina, Oksana Valerievna Dubinina, Alfa Edison I Lela Jan 2025

Aluminium Oxide Particles-Containing Organogels For Cleaning Of Optical Glass Surfaces, Galina Vladimirovna Lyamina, Oksana Valerievna Dubinina, Alfa Edison I Lela

Journal of Metals, Materials and Minerals

Hypothesis:  Some types of cleaning methods are not very effective and can actually increase damage to the optical parts being cleaned. As an alternative to these methods, we propose the use of gel-like substances to remove contaminants from optical surfaces. We have developed a method for cleaning optical glass surfaces that uses organogels, which are based on copolymers of methyl methacrylate and methacrylic acid. These organogels are loaded with polyethylene glycol, and aluminum oxide particles (Al2O3), which help to effectively remove contaminants without causing damage to the surface.   Experiments:  Al2O3 nanoparticles prepared by a Nano Spray Dryer were added to …

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Durability Of Precast Prestressed Concrete Pile In Exposure Severe Environment, Nantawat Khomwan, Pinai Mungsantisuk Jan 2025

Durability Of Precast Prestressed Concrete Pile In Exposure Severe Environment, Nantawat Khomwan, Pinai Mungsantisuk

Journal of Metals, Materials and Minerals

This research project focuses on studying the corrosion resistance of precast prestressed concrete (PC) piles under severe conditions. All PC and non-PC samples were cast using Portland cement type III. The samples included 1 m and 6 m length specimens. To evaluate the effectiveness of corrosion prevention, Sacrificial Anode Cathodic Protection (SACP) was installed in the specimens. Various durability properties of concrete were tested, including chloride permeability, concrete resistivity, and half-cell potential. For short-term effects, an electrical accelerated condition was conducted for the 1 m specimens, which were submerged in a 5% sodium chloride solution by weight. Experimental studies were …

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Investigation Of Photocathodic Corrosion Protection Of Zno/Zns Thin Film For Aisi 304 Stainless Steel In 3.5 Wt% Nacl Solution, Soravid Veerapong, Naw Blessing Oo, Boossayamas Dachbumroong, Parichart Chaum, Thanate Na Wichean, Oratai Jongprateep, Naray Pewnim, Gasidit Panomsuwan, Ratchatee Techapiesancharoenkij Jan 2025

Investigation Of Photocathodic Corrosion Protection Of Zno/Zns Thin Film For Aisi 304 Stainless Steel In 3.5 Wt% Nacl Solution, Soravid Veerapong, Naw Blessing Oo, Boossayamas Dachbumroong, Parichart Chaum, Thanate Na Wichean, Oratai Jongprateep, Naray Pewnim, Gasidit Panomsuwan, Ratchatee Techapiesancharoenkij

Journal of Metals, Materials and Minerals

Photocathodic protection is an alternative cathodic protection technique to protect metals by photo-generated electrons from a coupled semiconductor film under solar light. In this report, ZnO nanorods and heterostructure ZnO/ZnS nanorod films  on FTO substrates were studied for their photocathodic protection for 304 stainless steels (304 SS) in a 3.5 wt% NaCl solution.  The ZnO and ZnO/ZnS nanorods were fabricated on FTO substrates by spray pyrolysis and hydrothermal processes. The photocathodic performances of the ZnO and ZnO/ZnS photoanodes coupled with 304 SS samples were examined by Open-Circuit Potential (OCP), polarization curve analysis, and electrochemical impedance spectra (EIS). The ZnO/ZnS photoanodes …

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Investigation Into Parameters Affecting The Synthesis Of Hybrid Gold Nanoparticle/ Nitrogen-Doped Carbon Dot Colloids, Thammika Srisaman, Anyarat Watthanaphanit Jan 2025

Investigation Into Parameters Affecting The Synthesis Of Hybrid Gold Nanoparticle/ Nitrogen-Doped Carbon Dot Colloids, Thammika Srisaman, Anyarat Watthanaphanit

Journal of Metals, Materials and Minerals

This study reports a two-step synthesis method for producing hybrid nanoparticles composed of gold nanoparticles (AuNPs) and nitrogen-doped carbon dots (CDs). Initially, we employed hydrothermal synthesis to fabricate CDs derived from mangosteen peel extract, which exhibits green light emission. Subsequently, the hybrid AuNPs/CDs were synthesized by inducing plasma in a solution containing CDs and a gold precursor, namely gold(III) chloride trihydrate. Our primary aim was to investigate the key parameters influencing the synthesis process. We assessed the colloidal properties of the AuNPs/ CDs by introducing a stabilizer, specifically sodium alginate, and examined how factors such as the presence of sodium …

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