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Articles 2581 - 2610 of 16773

Full-Text Articles in Materials Science and Engineering

Optimization Of Ultrasound-Assisted Anthocyanin Extraction From Agricultural Waste Purple Corn Silk For Multifunctional Hemp Finishes, Benjamas Klaykruayat, Nattaya Vuthiganond, Pisutsaran Chitichotpanya Jan 2024

Optimization Of Ultrasound-Assisted Anthocyanin Extraction From Agricultural Waste Purple Corn Silk For Multifunctional Hemp Finishes, Benjamas Klaykruayat, Nattaya Vuthiganond, Pisutsaran Chitichotpanya

Journal of Metals, Materials and Minerals

The utilization of agricultural wastes for textile dyeing has gained popularity due to their safe and environmentally friendly properties, as well as the resource sustainability. Natural dye extraction is usually achieved through solvent extraction, which is time-consuming, requires a lot of solvent, and degrades desired compounds at high temperatures. Thus, this study investigated ultrasound-assisted anthocyanin extraction from agricultural waste purple corn silk as natural functional colorants for hemp finishes, given the numerous health benefits associated with anthocyanin. In order to optimize the extraction processes and evaluate the synergistic impact of these conditions, response surface methodology was implemented. The optimum conditions …

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Controlling Titanium Incorporation In Hydrogenated Amorphous Carbon Films Via Closed-Loop Feedback In Reactive High Power Impulse Magnetron Sputtering, Pornthip Ratchayotee, Artit Chingsungnoen, Phitsanu Poolcharuansin Jan 2024

Controlling Titanium Incorporation In Hydrogenated Amorphous Carbon Films Via Closed-Loop Feedback In Reactive High Power Impulse Magnetron Sputtering, Pornthip Ratchayotee, Artit Chingsungnoen, Phitsanu Poolcharuansin

Journal of Metals, Materials and Minerals

A closed-loop feedback approach has been developed to control titanium incorporation in hydrogenated amorphous carbon (a-C:H) films during reactive high-power impulse magnetron sputtering (R-HiPIMS). The average discharge current measured at the magnetron target is used as the primary feedback signal to regulate the target coverage state. Hence, the titanium concentration in the films can be controlled. Significant changes were observed in the film microstructure and properties as the target state evolved with increasing target coverage. This causes the film transition from metallic titanium to a-C:H films with decreasing titanium concentration. For example, the XRD and Raman analyses indicated a microstructural …

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In-Situ Embedding Of Nanocylindrical Bi25feo40 Into Scaffold-C3n4 For Enhanced Z-Scheme Photocatalytic Degradation, Yile Wang, Yuhui Ma, Liang Chu, Xing'ao Li Jan 2024

In-Situ Embedding Of Nanocylindrical Bi25feo40 Into Scaffold-C3n4 For Enhanced Z-Scheme Photocatalytic Degradation, Yile Wang, Yuhui Ma, Liang Chu, Xing'ao Li

Journal of Metals, Materials and Minerals

The development of Z-scheme heterojunctions has emerged as an effective approach for boosting the photocatalytic activity. Herein, we fabricated of a direct Z-scheme heterojunction between scaffold-like C3N4 and nanocylindrical Bi25FeO40, which exhibits enhanced photocatalytic activity and dye adsorption capacity. The in-situ embedding of Bi25FeO40 within scaffold C3N4 promotes photogenerated carrier separation, leading to an optimized degradation rate of 0.0205 min−1 and a contaminant removal efficiency of 85.3%. This work paves a new path for the development of high-efficiency photocatalytic degradation.

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Investigated The Ion Energy And The Microstructure Properties Of Tetrahedral Amorphous Carbon Film Produced By Pulsed Filtered Cathodic Vacuum Arc Combined With Plasma Biasing Technique, Nopphon Saowiang, Phitsanu Poolcharuansin, Artit Chingsungnoen, Nitisak Pasaja Jan 2024

Investigated The Ion Energy And The Microstructure Properties Of Tetrahedral Amorphous Carbon Film Produced By Pulsed Filtered Cathodic Vacuum Arc Combined With Plasma Biasing Technique, Nopphon Saowiang, Phitsanu Poolcharuansin, Artit Chingsungnoen, Nitisak Pasaja

Journal of Metals, Materials and Minerals

The purpose of this work is to demonstrate that operations using the plasma biasing technique in pulsed filtered cathodic vacuum arc (PFCVA) enable an energy-enhanced in deposition process for the high quality of tetrahedral amorphous carbon (ta-C) thin films (high sp3 content, denser, and very low surface roughness). The effect of anode bias potential on the energy distribution function of C+ ions, including the topography, microstructure, chemical state, and density of ta-C films, was systematically investigated. It was found that the plasma biasing technique can increase the average energy of C+ ions, but nevertheless, the ion …

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Single Electrode Mode Triboelectric Nanogenerator For Recognition Of Animal Sounds, Archana Panda, Kunal Kumar Das, Kushal Ruthvik Kaja, Mohamed Belal, Basanta Kumar Panigrahi Jan 2024

Single Electrode Mode Triboelectric Nanogenerator For Recognition Of Animal Sounds, Archana Panda, Kunal Kumar Das, Kushal Ruthvik Kaja, Mohamed Belal, Basanta Kumar Panigrahi

Journal of Metals, Materials and Minerals

This research presents an innovative and sustainable solution by designing triboelectric nanogenerators (TENGs) for energy harvesting. The fabrication process of TENGs includes PDMS and aluminum. The two single electrode mode TENG was designed one is plain PDMS/Al and the other is porous PDMS/Al TENG devices. The porous PDMS/Al TENG device generated a voltage and current of 7 V and 5 nA for 2 cm ´ 2 cm device area. Moreover, the TENG system was employed to successfully charge capacitors, and recognize various animal sounds. This study underscores the promising potential of harvesting energy from body movements and powering of devices, …

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Photoluminescent Carbon Nanodots For Artificial Photosynthesis, Rajie A. Medina, Michael E. Franco, Lyn Marie De Juan-Corpuz, Ryan D. Corpuz Jan 2024

Photoluminescent Carbon Nanodots For Artificial Photosynthesis, Rajie A. Medina, Michael E. Franco, Lyn Marie De Juan-Corpuz, Ryan D. Corpuz

Journal of Metals, Materials and Minerals

The emerging field of carbon dots (CDs), a type of carbon nanostructure that has gained significant attention due to its unique properties and potential applications. CDs possess remarkable attributes, including photoluminescence, electrochemical potential, compatibility with living organisms, solubility in water, chemical stability, and versatile surface properties. The chemical structure, particle size, and surface functionalities of CDs all have an impact on their photoluminescent properties, which are the focus of this review. The photoluminescence mechanism in CDs is discussed, highlighting their amorphous structure, and comparing them to graphene quantum dots. The paper delves into the application of CDs in artificial photosynthesis, …

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Composition-Driven Phase Coexistence And Functional Properties Of The (1-X)Bzt-(X)Bct Ceramics Near The Phase Convergence Region, Jirapa Tangsritrakul, Chumpon Wichittanakom, Chatree Saiyasombat Jan 2024

Composition-Driven Phase Coexistence And Functional Properties Of The (1-X)Bzt-(X)Bct Ceramics Near The Phase Convergence Region, Jirapa Tangsritrakul, Chumpon Wichittanakom, Chatree Saiyasombat

Journal of Metals, Materials and Minerals

The concept of composition-induced phase transformation in Lead Zirconate Titanate (PZT) at the Morphotropic Phase Boundary (MPB) has been employed to improve functional properties of the (1-x)BZT-(x)BCT ceramic. However, it was observed that the phase diagram of the (1-x)BZT-(x)BCT ceramic is different to the PZT. As a result, the nature of the superior functional properties found in (1-x)BZT-(x)BCT ceramic is unlike PZT and still unclear so far. In this work, functional properties; dielectric, ferroelectric, energy storage, and piezoelectric properties, of the (1-x)BZT-(x)BCT ceramics where x = 0.3 mol% to 0.6 mol% were evaluated at room temperature in comparison to the …

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Lldpe Film Development Surface With Nucleating Agents To Reduce Fat Stains From Food Adherence On The Film Surface For Easy Rinsing Before Recycling, Nattapong Pinpru, Chiranicha Ninthap, Supang Sripraphot, Supharada Khaisaat Jan 2024

Lldpe Film Development Surface With Nucleating Agents To Reduce Fat Stains From Food Adherence On The Film Surface For Easy Rinsing Before Recycling, Nattapong Pinpru, Chiranicha Ninthap, Supang Sripraphot, Supharada Khaisaat

Journal of Metals, Materials and Minerals

The purpose of this research was to enhance the surface of linear low-density polyethylene (LLDPE) film by using single and hybrid nucleating agents to reduce fat stains from food adherence on the film surface for easy rinsing before recycling, consequently reducing energy consumption before recycling. The process begins with the preparation of a high-concentration masterbatch of LLDPE with nucleating agents and polyethylene glycol (PEG), followed by blown film and test analysis. The results showed that both single and hybrid nucleating agents resulted in substantial modifications in the surface characteristics of the film. The altered surface texture of the film makes …

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Fast Microwave Synthesis Of High-Silica Natural Soil Based Porous Geopolymer, Naritsara Toobpeng, Sirithan Jiemsirilers Jan 2024

Fast Microwave Synthesis Of High-Silica Natural Soil Based Porous Geopolymer, Naritsara Toobpeng, Sirithan Jiemsirilers

Journal of Metals, Materials and Minerals

This study describes a simple microwave process for fabricating porous geopolymer-polymer based Shirasu soil. The porous geopolymer samples were synthesized using sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solution as alkaline solution in range of 0.5 M to 9 M. After mixing process, the geopolymer slurry was heated and stimulated geopolymerization reaction by different microwave powers at 200 W, 500 W and 700 W for 30 s, 60 s, 90 s and 120 s. The influence of NaOH concentration, microwave powers and heating times on the apparent bulk density, the water adsorption was focused. Results showed that the microwave powers …

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Investigating The High-Impact Deformation Behavior Of Induced-Nano Precipitation Hardened In718 Alloy, Harrison Okechukwu Onovo, Muideen Adebayo Bodude, David Ehigie Esezobor, Thaddeus Tochukwu Akano Jan 2024

Investigating The High-Impact Deformation Behavior Of Induced-Nano Precipitation Hardened In718 Alloy, Harrison Okechukwu Onovo, Muideen Adebayo Bodude, David Ehigie Esezobor, Thaddeus Tochukwu Akano

Journal of Metals, Materials and Minerals

Superalloys are the preferred materials for modern high-rotational complex components due to their exceptional ability to maintain critical properties such as strength, oxidation/corrosion resistance, even under extreme temperatures and dynamic impacts. This study investigates the dynamic impact response of nanoprecipitation-hardened 718 alloy (NPH-718 alloy) under various loading conditions. The wrought nickel-based NPH-718 alloy was transformed into a nanostructured state through a precise heat treatment process involving controlled cooling rates (28℃∙s‒1 to 30℃∙s‒1). A mechanical compression test, leading to failure, was employed to assess the alloy's ability to withstand dynamic impacts. The compressive dynamic behavior of the alloy at high strain …

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Atmospheric Hydrochloric And Nitric Acid Leaching Of A Limonite Ore From The Wolo Mine Area, Southeast Sulawesi, Indonesia, Sufriadin -, Malyanus Yepta, Irzal Nur, Purwanto -, Rizky Amalia, Ulva Ria Irfan, Djabal Nur Basir, Tsubasa Otake Jan 2024

Atmospheric Hydrochloric And Nitric Acid Leaching Of A Limonite Ore From The Wolo Mine Area, Southeast Sulawesi, Indonesia, Sufriadin -, Malyanus Yepta, Irzal Nur, Purwanto -, Rizky Amalia, Ulva Ria Irfan, Djabal Nur Basir, Tsubasa Otake

Journal of Metals, Materials and Minerals

The atmospheric acid leaching studies of a limonite ore sample from the Wolo mine area, Southeast Sulawesi, Indonesia, have been performed using hydrochloric acid (HCl) and nitric acid (HNO3). The objectives of these studies were to compare the leaching degree of metals (Ni, Co, Fe, and Al) and to analyze the dissolution behavior of minerals under different acid concentrations. Mineralogical characterization of the ore sample was conducted using optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction, whereas chemical composition was determined by X-ray fluorescence (XRF) spectrometry and atomic absorption spectroscopy (AAS), respectively. An atmospheric leaching test was done with …

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In Vitro And Vivo Biocompatibility And Degradability Of Low-Alloyed Mg-Zn-Ca-Mgo Composite As Bone Repair Biomaterials, Shuquan Zhang, Jiangtao Feng, Chaokun Tang, Ran Pang, Xinglong Zhang, Chenguang Li, Weihao Zhang, Fengxin Zhou, Feng Xue, Shaoyuan Lyu, Minfang Chen, Hao Wang Jan 2024

In Vitro And Vivo Biocompatibility And Degradability Of Low-Alloyed Mg-Zn-Ca-Mgo Composite As Bone Repair Biomaterials, Shuquan Zhang, Jiangtao Feng, Chaokun Tang, Ran Pang, Xinglong Zhang, Chenguang Li, Weihao Zhang, Fengxin Zhou, Feng Xue, Shaoyuan Lyu, Minfang Chen, Hao Wang

Journal of Metals, Materials and Minerals

Magnesium alloys have gained attention as biodegradable bone repair biomaterials. Unlike non-biodegradable materials like titanium and tantalum, biodegradable implants offer advantages in promoting bone healing and minimizing chronic inflammatory reactions. However, the impact of the implant's degradation on the osteogenic environment remains a concern. The Mg-Zn-Ca-MgO composite, being biocompatible and containing osteogenic ions, is a promising candidate. This study assesses the degradability and in vitro/in vivo biocompatibility of two Mg-Zn-Ca-MgO composites with varying degradation rates. The Mg-1Zn-0.2Ca-1.0MgO composite was prepared, and leaching solutions were created following standard protocols. MC3T3-E1 cell cultures were conducted to assess cell toxicity, alkaline phosphatase (ALP) …

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Electrospun Pt-Tio₂ Nanofibers Doped With Hpa For Catalytic Hydrodeoxygenation, Amos Taiswa, Randy L. Maglinao, Jessica M. Andriolo, Sandeep Kumar, Jack L. Skinner Jan 2024

Electrospun Pt-Tio₂ Nanofibers Doped With Hpa For Catalytic Hydrodeoxygenation, Amos Taiswa, Randy L. Maglinao, Jessica M. Andriolo, Sandeep Kumar, Jack L. Skinner

Civil & Environmental Engineering Faculty Publications

Electrospinning is utilized to fabricate catalytic nanofiber scaffold for biocrude upgrading in hydrodeoxygenation (HDO) following computational studies suggesting the need for nano-catalysts for efficient HDO conversion and selectivity. Here, Pt-TiO2 nanofibers are fabricated through electrospinning, followed by wet impregnation with a heteropoly acid (HPA), tungstosilicic acid. Intensive heat treatments were incorporated during and after processes to obtain a HPA doped Pt-TiO2 nano-catalyst. Catalytic HDO was performed in a batch reactor with phenol as the raw biocrude dissolved in hexadecane. The HPA doped Pt-TiO2 catalyst demonstrated promising HDO performance of 37.2% conversion and a 78.9% selectivity to oxygen …

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A Concept Of Producing Aluminum In-Situ On The Moon Through Molten Salt Electrolysis, Jacob N. Ortega, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daniel Stutts, Daoru Han Jan 2024

A Concept Of Producing Aluminum In-Situ On The Moon Through Molten Salt Electrolysis, Jacob N. Ortega, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daniel Stutts, Daoru Han

Materials Science and Engineering Faculty Research & Creative Works

This paper presents a concept of producing aluminum in-situ on the lunar surface, namely, the Lunar In-Situ Aluminum Production through Molten Salt Electrolysis (LISAP-MSE) method developed at Missouri University of Science and Technology. This paper aims to demonstrate the use of electro-deoxidation to reduce aluminum oxide (i.e., alumina) into aluminum and oxygen gas via electrolysis in a molten salt bath for the production of aluminum on the Moon. It is shown that with a steady supply of hydrogen chloride, this in-situ resource utilization (ISRU) method could supply several necessary materials consumed in the electro-deoxidation process except hydrogen chloride to produce …

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Progress Of Lisap-Mse: A Concept Of Producing Aluminum In-Situ On The Moon Through Molten Salt Electrolysis, Jacob N. Ortega, David Bayless, Daniel Stutts, Daoru Han, Todd P. Sander, Jeffrey Smith, Fateme Rezaei, William Schonberg Jan 2024

Progress Of Lisap-Mse: A Concept Of Producing Aluminum In-Situ On The Moon Through Molten Salt Electrolysis, Jacob N. Ortega, David Bayless, Daniel Stutts, Daoru Han, Todd P. Sander, Jeffrey Smith, Fateme Rezaei, William Schonberg

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This paper presents a concept of producing aluminum in-situ on the lunar surface, namely, the Lunar In-Situ Aluminum Production through Molten Salt Electrolysis (LISAP-MSE) method developed at Missouri University of Science and Technology. This paper aims to demonstrate the use of electro-deoxidation to reduce aluminum oxide (i.e., alumina) into aluminum and oxygen gas via electrolysis in a molten salt bath for the production of aluminum on the Moon. It is shown that with a steady supply of hydrogen chloride, this in-situ resource utilization (ISRU) method could supply several necessary materials consumed in the electro-deoxidation process except hydrogen chloride to produce …

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Enhanced Bottom Anode Monitoring In Dc Electric Arc Furnaces Using Fiber Optic Sensors, Yeshwanth Reddy Mekala, Rony Kumer Saha, Ogbole Collins Inalegwu, Muhammad Roman, Farhan Mumtaz, Rex Gerald, Jeffrey D. Smith, Jie Huang, Ronald J. O'Malley Jan 2024

Enhanced Bottom Anode Monitoring In Dc Electric Arc Furnaces Using Fiber Optic Sensors, Yeshwanth Reddy Mekala, Rony Kumer Saha, Ogbole Collins Inalegwu, Muhammad Roman, Farhan Mumtaz, Rex Gerald, Jeffrey D. Smith, Jie Huang, Ronald J. O'Malley

PSMRC Faculty Research

A pin style bottom anode employs conductive steel rods that serve as the pathway for the high electrical power through rammed refractory at the bottom of a DC Electric Arc Furnace (EAF). Anode wear during operation is important to monitor, as anode replacement is expensive and impacts EAF productivity. Liquid steel penetration into the un-sintered refractory layer can result from rapid electrical power ramp-up, dips in furnace temperature, or operating the anode for too long between EAF campaigns. In extreme cases, the liquid steel may penetrate the bottom of the furnace when anode wear progresses too close to the bottom …

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Sic Addition To A Dual Phase High Entropy Ultra-High Temperature Ceramic, Rubia Hassan, William G. Fahrenholtz, Kantesh Balani, Gregory E. Hilmas, Jeremy Watts Jan 2024

Sic Addition To A Dual Phase High Entropy Ultra-High Temperature Ceramic, Rubia Hassan, William G. Fahrenholtz, Kantesh Balani, Gregory E. Hilmas, Jeremy Watts

Materials Science and Engineering Faculty Research & Creative Works

Dual phase (Hf,Ta,Ti,W,Zr)B2-(Hf,Ta,Ti,W,Zr)C high entropy ultra-high temperature ceramics were processed from commercial diboride and carbide powders with and without SiC additions. A 30-min hold at a maximum temperature of 1850 °C in spark plasma sintering resulted in a relative density of ∼95 %, which increased to ∼100 % with the addition of 7.5 wt.% SiC. The compositions did not reach chemical equilibrium under the given sintering conditions resulting in an inhomogeneous distribution of transition metals in both the boride and carbide phases. The addition of SiC improved densification by inhibiting grain growth, which reduced the grain size from 9.0 ± …

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Magnetic Separation Of Lunar Regolith Simulants With Applications To In Situ Resource Utilization On The Moon, Peter Bachle, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han Jan 2024

Magnetic Separation Of Lunar Regolith Simulants With Applications To In Situ Resource Utilization On The Moon, Peter Bachle, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han

Materials Science and Engineering Faculty Research & Creative Works

The development of in situ resource utilization (ISRU) for metal extraction is imperative as a steppingstone for habitation construction in lunar and non-terrestrial environments. Separation of minerals by chemical composition is important to optimize metal and oxygen liberation from lunar ore. to this effect, devices capable of separating aluminum bearing minerals from iron-bearing minerals from the lunar regolith simulants have been developed. Twenty-eight different simulants have been used in this study. a dual-belt separator was designed to reduce middlings. Para-magnetic minerals were reliably separated using a neodymium N52-magnet-separator system. Effective separation of aluminum-bearing minerals from iron-bearing minerals was greater than …

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Beneficiation Of Lunar Regolith Simulants Through Electrostatic Sieving And Magnetic Separation, Peter Bachle, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han Jan 2024

Beneficiation Of Lunar Regolith Simulants Through Electrostatic Sieving And Magnetic Separation, Peter Bachle, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han

Materials Science and Engineering Faculty Research & Creative Works

In the light of future development of lunar structures, in-situ feldspar beneficiation is imperative for metal extraction. This research incorporates the tandem use of electrostatic sieving and magnetic separation for collecting a specific size range and mineral composition from lunar soil that optimizes subsequent chemical processing. While earlier works focused on silt-sized particles, this work expands that range up to medium-grained sand with a greater variety of potential lunar regolith compositions. This work shows that a 2.5 kV, 7 Hz to 30Hz frequency, single-phase square wave can lift silt and fine sand for collection. This lifting is successful directly from …

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Kinetic Modeling Of Electrostatic Sieving For Lunar Regolith Beneficiation: Case Studies, Easton Ingram, Emmanuela Amen Eze, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han Jan 2024

Kinetic Modeling Of Electrostatic Sieving For Lunar Regolith Beneficiation: Case Studies, Easton Ingram, Emmanuela Amen Eze, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han

Materials Science and Engineering Faculty Research & Creative Works

A new kinetic particle modeling framework was developed to investigate electrostatic transport of lunar regolith particles with applications to the concept of electrostatic sieving. The new approach is based on kinetic particle dynamics and includes major modules of sampling the particle size distribution, solving electric fields, and tracking motion of charged dust grains. Case studies for a concept of electrostatic sieving were chosen to validate the new model. The simulation achieved similar yields reported in previous works, which served as validation of the model. The new model is computationally efficient and could serve as a design, analysis, and optimization tool.

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Development Of A Highly Loaded Zirconium Carbide Paste For Material Extrusion Additive Manufacturing, Clare Sabata, Austin J. Martin, Jeremy L. Watts, Gregory E. Hilmas Jan 2024

Development Of A Highly Loaded Zirconium Carbide Paste For Material Extrusion Additive Manufacturing, Clare Sabata, Austin J. Martin, Jeremy L. Watts, Gregory E. Hilmas

Materials Science and Engineering Faculty Research & Creative Works

A highly loaded, aqueous-based zirconium carbide (ZrC) paste was developed for ceramic on-demand extrusion (CODE). Commercial ZrC powder was ball milled to reduce the particle size to ∼1 μm. Paste composition was determined by rheological characterization and observation of printing behavior; the final paste consisted of 46–47 vol% ZrC, 43.5 vol% distilled water, 8.1 vol% dispersant, and 1.6 vol% binder. Rheological characterization of the paste showed a yield stress of ∼8 Pa and shear thinning behavior (ΔG′/Δσ* = −55). The paste was printed using a 610 μm nozzle; a test print showed shape fidelity using the developed paste. A pressureless …

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Effect Of Sc Spatial Distribution On The Electronic And Ferroelectric Properties Of Alscn, Bipin Bhattarai, Xiaoman Zhang, Wangwang Xu, Yijia Gu, W. J. Meng, Andrew C. Meng Jan 2024

Effect Of Sc Spatial Distribution On The Electronic And Ferroelectric Properties Of Alscn, Bipin Bhattarai, Xiaoman Zhang, Wangwang Xu, Yijia Gu, W. J. Meng, Andrew C. Meng

Materials Science and Engineering Faculty Research & Creative Works

While aluminum scandium nitride based ferroelectric materials have shown significant promise for non-volatile memory applications, difficulties relating challenges in device performance, such as electrical leakage, to structural characteristics motivate improved understanding of the fundamental structure-property relationship. Spinodal decomposition has been reported in this material system, consistent with our observation of compositional segregation in AlScN films grown by reactive sputter epitaxy. To better understand the effects of spatially non-uniform Sc concentrations, the electronic and ferroelectric (FE) properties of AlScN as a function of Sc distribution are studied using density functional theory (DFT). We explore the impact of Sc-rich atomic planes in …

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Phenolic Polymer Infiltration And Pyrolysis Process For Additively Manufactured Carbon/Peek Composites To Produce Carbon–Carbon Composites, S. Weiler, H. A. Haffner, K. Chandrashekhara, J. Watts, G. E. Hilmas, J. Bayldon, L. M. Rueschhoff Jan 2024

Phenolic Polymer Infiltration And Pyrolysis Process For Additively Manufactured Carbon/Peek Composites To Produce Carbon–Carbon Composites, S. Weiler, H. A. Haffner, K. Chandrashekhara, J. Watts, G. E. Hilmas, J. Bayldon, L. M. Rueschhoff

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Carbon–carbon composites are carbon fibers reinforced with carbon matrix and are classified as advanced materials well suited for high-temperature structural applications. Carbon–carbon composites are characterized by maintaining excellent mechanical properties and structural stability at high temperatures and have been used in aerospace application as nozzles, heatshields, and leading edge. However, conventional methods to manufacture carbon–carbon composites are costly and time-consuming. the aim of this work is to develop a method for creating additively manufactured (AM) carbon–carbon composites using a high-pressure re-infiltration process. in doing so, less infiltration cycles are required compared to a low-pressure re-infiltration, reducing the total manufacture time. …

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Damage Initiation Of 15v38 Steel Bar During Square-To-Round Hot Rolling Process, Siva Sai Krishna Dasari, Henry Adekola Haffner, K. Chandrashekhara, Mario F. Buchley, Simon N. Lekakh, Ronald J. O'Malley Jan 2024

Damage Initiation Of 15v38 Steel Bar During Square-To-Round Hot Rolling Process, Siva Sai Krishna Dasari, Henry Adekola Haffner, K. Chandrashekhara, Mario F. Buchley, Simon N. Lekakh, Ronald J. O'Malley

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Hot rolling processes have been extensively used to produce round bars by reducing the cross-sectional area of continuously cast steel. The current trend toward increasing productivity often requires a more aggressive reduction per pass. Establishing safe and optimized hot rolling parameters must be determined to avoid damage while deforming the specific steel composition. Understanding the damage mechanism during the metal forming process is vital for product quality. Herein, a combined experimental and simulation approach is developed to track the evolution potential damage during hot bar rolling. Hot tension tests are conducted on as-cast vanadium micro alloyed 15V38 steel at different …

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Thermodynamic Analysis Of Metal Segregation In Dual Phase High Entropy Ceramics, Steven M. Smith, William G. Fahrenholtz, Gregory E. Hilmas, Stefano Curtarolo Jan 2024

Thermodynamic Analysis Of Metal Segregation In Dual Phase High Entropy Ceramics, Steven M. Smith, William G. Fahrenholtz, Gregory E. Hilmas, Stefano Curtarolo

Materials Science and Engineering Faculty Research & Creative Works

Equilibrium Gibbs' free energy calculations were used to determine metal segregation trends between boride and carbide solid solutions containing two metals that are relevant to dual phase high entropy ceramics. The model predicted that Ti had the strongest tendency to segregate to the boride phase followed by Zr, Nb, Mo, V, Hf, and Ta, which matches experimental results of measured compositions. The ratio of a metal in the carbide phase to the content of the same metal in the corresponding metal boride had a linear trend with the change in standard Gibbs' free energy of reaction for a metal carbide …

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A Super-Hard High Entropy Boride Containing Hf, Mo, Ti, V, And W, Suzana Filipovic, Nina Obradovic, Greg E. Hilmas, William G. Fahrenholtz, Donald W. Brenner, Jon Paul Maria, Douglas E. Wolfe, Eva Zurek, Xiomara Campilongo, Stefano Curtarolo Jan 2024

A Super-Hard High Entropy Boride Containing Hf, Mo, Ti, V, And W, Suzana Filipovic, Nina Obradovic, Greg E. Hilmas, William G. Fahrenholtz, Donald W. Brenner, Jon Paul Maria, Douglas E. Wolfe, Eva Zurek, Xiomara Campilongo, Stefano Curtarolo

Materials Science and Engineering Faculty Research & Creative Works

Super-Hard (Hf,Mo,Ti,V,W)B2 Was Synthesized by Boro-Carbothermal Reduction and Densified by Spark Plasma Sintering. This Composition Was Produced for the First Time as a Single-Phase Ceramic in the Present Research. the Optimized Ceramic Had a Single Hexagonal AlB2-Type Crystalline Phase with a Grain Size of 3.8 µm and Homogeneous Distribution of the Constituent Metals. the Vickers Hardness Exhibited the Indentation Size Effect, Increasing from 27 GPa at a Load of 9.8 N to as High as 66 GPa at a Load of 0.49 N. This is the Highest Hardness Reported to Date for High Entropy Boride Ceramics.

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Oxidation Of Additively Manufactured Zrb2–Sic In Air And In Co2 At 700–1000 °C, Marharyta Lakusta, Nicholas M. Timme, Abid H. Rafi, Jeremy Lee Watts, M. (Ming) C. (Chuan) Leu, Gregory E. Hilmas, William G. Fahrenholtz, David W. Lipke Jan 2024

Oxidation Of Additively Manufactured Zrb2–Sic In Air And In Co2 At 700–1000 °C, Marharyta Lakusta, Nicholas M. Timme, Abid H. Rafi, Jeremy Lee Watts, M. (Ming) C. (Chuan) Leu, Gregory E. Hilmas, William G. Fahrenholtz, David W. Lipke

Materials Science and Engineering Faculty Research & Creative Works

Oxidation behavior of additively manufactured zrb2–sic in air and in co2 is reported in the temperature range of 700–1000 °c. Observed scale morphologies in air and in co2 were similar, featuring an outer borosilicate layer and an inner porous zirconia layer containing partially oxidized silicon carbide particles and remnant borosilicate products. Oxide scale thicknesses and parabolic scaling constants in air were approximately twice those observed in co2 across all studied temperatures. Activation energies for oxidation of 140 ± 20 kj/mol in air and 110 ± 20 kj/mol in co2 were determined, indicating similar diffusion processes that appear to be rate-limiting. …

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Additive Manufacturing Of Novel Lightweight Insulation Refractory With Hierarchical Pore Structures By Direct Ink Writing, Saisai Li, Jiaxuan Xin, Ruoyu Chen, Haiming Wen Jan 2024

Additive Manufacturing Of Novel Lightweight Insulation Refractory With Hierarchical Pore Structures By Direct Ink Writing, Saisai Li, Jiaxuan Xin, Ruoyu Chen, Haiming Wen

Materials Science and Engineering Faculty Research & Creative Works

A direct ink writing process using fly ash foaming slurries was employed for the additive manufacturing of lightweight mullite insulation refractory with hierarchical pore structures. The viscosity, thixotropy, and shear thinning behavior of the inks were analyzed to investigate the effect of the inorganic binder and dispersant of the foaming inks. A slurry exhibiting excellent rheological characteristics was identified, consisting of 45 wt% fly ash floating beads, 55 wt% water, 3.0 wt% additional dispersant, and 6.0 wt% additional binder. Furthermore, through the optimization of printing parameters such as printing pressure and printing speed, notable enhancements were achieved in the pore …

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Morphology And Particle Size (Maps) Exercise: Testing The Applications Of Image Analysis And Morphology Descriptions For Nuclear Forensics, Stuart A. Dunn, Ian J. Schwerdt, David E. Meier, Naomi E. Marks, Thomas Shaw, Alexa Hanson, Kari Sentz, Meena Said, Richard A. Clark, Kyle A. Makovsky, Jason M. Lonergan, Matthew Gilbert Jan 2024

Morphology And Particle Size (Maps) Exercise: Testing The Applications Of Image Analysis And Morphology Descriptions For Nuclear Forensics, Stuart A. Dunn, Ian J. Schwerdt, David E. Meier, Naomi E. Marks, Thomas Shaw, Alexa Hanson, Kari Sentz, Meena Said, Richard A. Clark, Kyle A. Makovsky, Jason M. Lonergan, Matthew Gilbert

Materials Science and Engineering Faculty Research & Creative Works

Image analysis techniques have been applied and shown to be a valuable tool in nuclear forensics analysis. The interlaboratory exercise reported here has tested quantitative and qualitative approaches for characterizing nuclear materials. Particle size, surface features and morphology descriptions were compared by four laboratories on a common image set generated by Scanning Electron Microscopy and Digital Light Microscopy. Quantitative analysis of the image sets through the Morphological Analysis for Materials software highlighted the strength of image analysis, but also that the application of the software alone can introduce significant bias in the analysis. Qualitative morphology descriptions following the process outlined …

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Ring Opening Functionalization Of Thiolactone Homopolymers For Ros Scavenging, Aaron Priester, Forrest Kievit, Anthony J. Convertine Jan 2024

Ring Opening Functionalization Of Thiolactone Homopolymers For Ros Scavenging, Aaron Priester, Forrest Kievit, Anthony J. Convertine

Materials Science and Engineering Faculty Research & Creative Works

In This Research, We Explored the Synthesis and Application of Thiolactone Acrylamide (TLA) Polymers for Neutralizing Reactive Oxygen Species (ROS), Produced as a Result of Traumatic Brain Injury (TBI). We Synthesized Well-Defined TLA Polymers using RAFT (Reversible Addition-Fragmentation Chain Transfer) Polymerization Across a Range of Monomer-To-Chain Transfer Agent ([M]0/[CTA]0) Ratios to Achieve a Range of Molar Masses. Polymerizations Were Carried Out using a Trithiocarbonate CTA (Chain Transfer Agent) with AIBN (Azobisisobutyronitrile) as the Initiator in N'N-Dimethylacetamide (DMAc) at 60 °C. Kinetic Studies Indicated a Linear Increase in Molar Mass with Conversion, Pseudo-First-Order Kinetics, and Molar Mass Values that Are Consistent …

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