Fast Microwave Synthesis Of High-Silica Natural Soil Based Porous Geopolymer,
2024
Chulalongkorn University
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 …
Investigating The High-Impact Deformation Behavior Of Induced-Nano Precipitation Hardened In718 Alloy,
2024
Chulalongkorn University
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 …
Atmospheric Hydrochloric And Nitric Acid Leaching Of A Limonite Ore From The Wolo Mine Area, Southeast Sulawesi, Indonesia,
2024
Chulalongkorn University
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 …
In Vitro And Vivo Biocompatibility And Degradability Of Low-Alloyed Mg-Zn-Ca-Mgo Composite As Bone Repair Biomaterials,
2024
Chulalongkorn University
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) …
Hot Corrosion Behavior Of Mg2 Sio4 Ceramic Exposed To Molten Na2so4 At 900℃ To 1100℃,
2024
Chulalongkorn University
Hot Corrosion Behavior Of Mg2 Sio4 Ceramic Exposed To Molten Na2so4 At 900℃ To 1100℃, Hamza Milles, Louafi Snani, Amel Oulabbas, Khaled Toualbia
Journal of Metals, Materials and Minerals
Thermal barriers are used as protective coating for critical components working at high temperature of gas turbines. Forsterite (Mg2SiO4) ceramic is proposed by researchers as a novel thermal barrier coating (TBC), due to its low thermal conductivity and good thermal expansion. Hot corrosion results from the molten salts effect on the TBC’s surface, accumulated during the combustion processes. In this study, Mg2SiO4 samples were exposed to Na2SO4 molten salt at 900℃, 1000℃ and 1100℃ for 6 h in air. Samples were investigated and compared using scanning electron microscope (SEM) and X-Ray diffractometer (XRD). MgSO4 was the predominant corrosion product observed …
A Contribution To The Exploration Of The Chemical Durability, Thermal Stability, And Structural Ability Of Glasses From The Fe2o3-K2o-Moo3-P2o5 Quaternary System,
2024
Chulalongkorn University
A Contribution To The Exploration Of The Chemical Durability, Thermal Stability, And Structural Ability Of Glasses From The Fe2o3-K2o-Moo3-P2o5 Quaternary System, Asmae Er-Rafai, Yasmina Alaoui, Mohamed Laourayed, Mohamed Ounacer, Mouloud El Moudane, Mohammed Sajieddine, Abdelkbir Bellaouchou
Journal of Metals, Materials and Minerals
The relationships between the properties and structure of xFe2O3-(40-x)K2O-10MoO3-50P2O5 glasses have been reported in this paper. Homogeneous glasses are formed for different Fe2O3 contents. The density and molar volume evolution of these glasses shows that Fe2O3 acts as a glass former and strengthens the structural bonds of the glass. Experimental 57Fe Mössbauer spectroscopy graphs suggest the existence of divalent Iron (FeII) and trivalent Iron (FeIII). The boost in chemical durability agrees with the growth in glass transition temperature due to more powerful bonding in the structural network. P-O-Fe bonds replace P-O-P bonds when Fe2O3 is present in the phosphate network.
Incorporating Novel Bio-Mineral Materials Of Silicone-Arrowroot Modified Starch For Compressed Powder,
2024
Chulalongkorn University
Incorporating Novel Bio-Mineral Materials Of Silicone-Arrowroot Modified Starch For Compressed Powder, Pirada Sudprasert, Ananthaya Sansawat, Piangkhwan Kruapoo
Journal of Metals, Materials and Minerals
Incorporating novel bio-mineral materials of silicone-arrowroot modified starch (SA) is an environmentally friendly technique to create compressed powder, thereby integrating biodiversity with sustainability and responding to the Bio-Circular-Green (BCG) economy. The SA had improved flowability and water resistance compared with non-modified arrowroot flour (A0), concurring with the Fourier Transform Infrared (FTIR), scanning electron microscope (SEM) analyses that indicated more hydrophobic properties. To investigate the formulated dust and compressed powder, three types of binders including magnesium stearate (Ms), isopropyl myristate (Im), and mineral oil (Mo) were examined. Powder samples of all binders at each concentration gave high water resistance with floating …
The Effects Of Copper On The Mechanical Properties Of Ti-10mo Alloy Prepared By Powder Metallurgy Method,
2024
Chulalongkorn University
The Effects Of Copper On The Mechanical Properties Of Ti-10mo Alloy Prepared By Powder Metallurgy Method, Aji Abdillah Kharisma, Haris Rudianto, Achmad Benny Mutiara, Sulistyo Puspitodjati, Fahamsyah Hamdan Latief, Agus Sukarto Wismogroho, Wahyu Bambang Widayatno, Didik Aryanto, Cherly Firdharini
Journal of Metals, Materials and Minerals
Titanium alloys are currently widely explored and produced for applications in various engineering fields. Alloying metal elements such as Mo, Cu, and Mn bring more advantages among them to help improve the mechanical properties of titanium alloys. This study is intended for the evaluation of mechanical properties through compression and hardness testing performed on a Ti-10Mo alloy with copper addition by powder metallurgy. Ti-10Mo alloys with the addition of copper contents of 3 wt% Cu, 6 wt% Cu, and 9 wt% Cu were prepared to optimize the properties of Ti-10Mo-xCu alloys. With the addition of 3 wt% copper, the compressive …
First-Principles Study On Structural And Electronic Properties Of P3ht-Graphene,
2024
Chulalongkorn University
First-Principles Study On Structural And Electronic Properties Of P3ht-Graphene, Fia Amalia, Ari Dwi Nugraheni, Sholihun Sholihun
Journal of Metals, Materials and Minerals
Based on density functional theory, calculations have been carried out to study the structural and electronic properties of the polymer Poly (3-hexylthiophene) (P3HT) interacting with monolayer graphene as an active layer. (P3HT)1-graphene and (P3HT)2-graphene are optimized on graphene using the generalized-gradient-approximation type of the exchange-correlation functional. Adsorption energy, band gap, and charge transfer are calculated. The calculated adsorption energy shows that all systems have negative adsorption energy, indicating that the reaction is exothermic. Compared to (P3HT)1-graphene, (P3HT)2-graphene has a lower band gap. As for the charge transfer calculation, a negative ΔN indicates that electron transfers from P3HT to graphene.
Integration Of Jackfruit Seed-Derived Carbon Dots And Electronic Nose For A Sensitive Detection Of Formaldehyde Vapor,
2024
Chulalongkorn University
Integration Of Jackfruit Seed-Derived Carbon Dots And Electronic Nose For A Sensitive Detection Of Formaldehyde Vapor, Thitarat Prathumsuwan, Sumana Kladsomboon, Alfred Antony Christy, Insik In, Xiao Liang, Shufeng Song, Yao Wang, Thitirat Inprasit, Peerasak Paoprasert, Natee Sirisit
Journal of Metals, Materials and Minerals
The preparation of carbon dots from jackfruit seeds through a pyrolysis method at 280℃ and their use for the detection of formaldehyde were reported. The as-prepared carbon dots showed a high fluorescence efficiency with a quantum yield of 12.7% and excellent photostability and dispersibility in aqueous solution with a zeta potential of ‒62.5 mV. The integration of carbon dot thin film and a home-made optical electronic nose system possessed sensitivity towards formaldehyde vapor with a detection limit of 24.7%v/v across a linear range of 25%v/v to 100%v/v. Furthermore, the sensor showed the highest sensitivity towards formaldehyde against other volatile organic …
Nano-Zno Prepared By Using Chaya And Mango Leaves Extract For Photocatalyst Of Methylene Blue,
2024
Chulalongkorn University
Nano-Zno Prepared By Using Chaya And Mango Leaves Extract For Photocatalyst Of Methylene Blue, Sri Wahyu Suciyati, Junaidi Junaidi, Rudy Situmeang, Posman Manurung
Journal of Metals, Materials and Minerals
This research aimed to synthesize nano-ZnO from chaya (Cnidoscolus aconitifolius) and mango leaves extract (Mangifera indica) as environmentally friendly photocatalysts. Nano-ZnO was synthesized using green synthesis, with leaves extracts as reducing agents and nanoparticle size stabilizers. The samples were prepared using two methods, namely nano-ZnO-1 and nano-ZnO-2. The results of Fourier transform infrared spectroscopy (FTIR) analysis showed the contribution of metabolite compounds in nano-ZnO synthesis. X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed the crystal size in nano range, with spherical nanorod morphology observed. Ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) determined the band gap energy …
Photocatalytic Degradation Of Ciprofloxacin Drug Utilizing Novel Pvdf/Polyaniline/ Lanthanum Strontium Manganate@Ag Composites,
2024
Chulalongkorn University
Photocatalytic Degradation Of Ciprofloxacin Drug Utilizing Novel Pvdf/Polyaniline/ Lanthanum Strontium Manganate@Ag Composites, Swayam Aryam Behera, Ali Amanat, P. Ganga Raju Achary
Journal of Metals, Materials and Minerals
Poly (vinylidene fluoride) (PVDF) is the first-choice ferroelectric support or membrane material. The lanthanum strontium manganite (LSMO) is a well-known electrode material in the class of the solid oxide fuel cell (SOFC) materials. A set of four polymer composites PVDF-LSMO-PANI(5.0 wt%) with different amount of silver doping were fabricated with the silver nitrate and reducing agent. The characterization of these four novel PVDF based composites were characterized by the XRD, FTIR, SEM, UV-Visible DRS. The present communication highlights: (I) the effect of PANI in the PVDF-LSMO-PANI (PLP) composites towards the photocatalytic degradation of ciprofloxacin drug. (II) the effect of Ag …
The Effect Of Two-Stage Heat Treatment On The Microstructure And Mechanical Properties Of High Chrome Austenitic Manganese Steel,
2024
Chulalongkorn University
The Effect Of Two-Stage Heat Treatment On The Microstructure And Mechanical Properties Of High Chrome Austenitic Manganese Steel, Mohammad Reza Hermawan, Budi Hartono Setiamarga, Ilham Nur Hakim, Rizka Mulia Anggraeni
Journal of Metals, Materials and Minerals
In this research, heat-treatment was used to determine changes in the microstructure and mechanical characteristics of austenitic manganese steel equivalent to ASTM A128-C. Carbide formed in as-cast conditions is transformed into dispersed hardened austenite to increase the toughness of the material because it can inhibit dislocation movement. Heat treatment is carried out in two heating stages. The first stage of heating was carried out at a temperature of 625°C with a holding time varying by 2.5, 3.5, and 4.5 h, and the second stage was carried out at a temperature of 1000°C with a constant holding time of 1.5 h. …
Microstructural And Dielectric Characteristics Of The Ce-Doped Bi2femno6,
2024
Chulalongkorn University
Microstructural And Dielectric Characteristics Of The Ce-Doped Bi2femno6, Laxmidhar Sahoo, Swayam Aryam Behera, Rajesh Kumar Singh, Santosh Kumar Parida, Patnala Ganga Raju Achary
Journal of Metals, Materials and Minerals
A double-perovskite material Bi2FeMn0.94Ce0.06O6 (BFMCO) was synthesized by solid state reaction technique and characterized it by various techniques (structural, microstructural, dielectric, impedance and modulus properties). The material has an orthorhombic crystal structure with an average crystallite size of 52.4 nm, as revealed by X-ray diffraction data (XRD). The scanning electron microscope (SEM) image shows the presence of nano rod-shaped grains and well-defined grain boundaries in this material, with an average grain size of 21.8 µm. The Energy dispersive X-ray (EDX) analysis and color mapping confirm the purity and the composition of the material. The dielectric, impedance and modulus properties are …
Green Synthesis Of Bimetallic Cuo@Nio Nanocomposite For The Removal Of Glyphosate,
2024
Chulalongkorn University
Green Synthesis Of Bimetallic Cuo@Nio Nanocomposite For The Removal Of Glyphosate, Kornkanok Boonserm, Anan Sutcha, Rarm Phinjaroenphan
Journal of Metals, Materials and Minerals
Green synthesis of photocatalyst bimetallic CuO@NiO nanocomposite for eliminating organic hazardous glyphosate (Gly) solution has been introduced. The nanocomposite has been successfully developed from mango (Mangifera indica L.) peel extracted solution by a simultaneous reduction process. HRTEM, XRD, and EDX have also been used to explore the nanostructure, crystal conformation, and chemical compositions of CuO@NiO. Using UV-vis spectrometer, we have observed the photo-catalytic activity and kinetic removal rate constant of CuO@NiO in terms of glyphosate elimination under UV light illumination. Compared with pure CuO and NiO nanoparticles, CuO@NiO displayed improved and enhanced photocatalytic activity. This work demonstrates an …
Possibility Of Using Boric Acid And Glutinous Rice Flour As Additive For Producing Silicon Carbide Ceramic Via Pressureless Solid-State Sintering,
2024
Chulalongkorn University
Possibility Of Using Boric Acid And Glutinous Rice Flour As Additive For Producing Silicon Carbide Ceramic Via Pressureless Solid-State Sintering, Apichart Jinnapat, Auamporn Rattanasing, Nithiwach Nawaukkaratharnant, Kritkeaw Somton, Kannigar Dateraksa
Journal of Metals, Materials and Minerals
This research aimed to investigate the possibility of using the mixture of boric acid and glutinous rice flour as a cost-efficient alternative additive for producing silicon carbide (SiC) ceramic sintered at 1800℃ via pressureless solid-state sintering. The results indicated that the addition of boric acid- glutinous rice flour mixture (10 wt%) in an appropriate ratio (0.5 by molar ratio) into the SiC mixture (90 wt%) enhanced the densification and flexural strength of sintered SiC samples. However, increasing boric acid/glutinous rice flour ratio reduces density and flexural strength. The 5.45 wt% carbon content was sufficient to remove the oxide layer of …
Development Of Antioxidant Film Based On Gelatin And Carboxymethylcellulose Incorporated With Tecoma Stans (L.) Juss. Ex Kunth Petals Extract For Biodegradable Food Packaging,
2024
Chulalongkorn University
Development Of Antioxidant Film Based On Gelatin And Carboxymethylcellulose Incorporated With Tecoma Stans (L.) Juss. Ex Kunth Petals Extract For Biodegradable Food Packaging, Pacharawan Ratanasongtham, Passara Sukplee, Yutthana Wongnongwa
Journal of Metals, Materials and Minerals
The aim of this research was to develop a novel combination of antioxidant blended film for use as biodegradable packaging in the food industry. The antioxidant film was prepared based on gelatin (G) and carboxymethyl cellulose (CMC) incorporated with Tecoma stans (L.) Juss. ex Kunth petals extract (TKE) at various concentrations (0.5, 1.0, and 2.0 mg∙L‒1) via solution casting method. The structural and surface morphology of G/CMC-TKE film were characterized using FTIR spectrometry technique and scanning electron microscopy (SEM), including determining antioxidant activity, water solubility, water vapor permeability, and biodegradability. According to FTIR analysis, the significant interaction between the gelatin …
The Effect Of Mixing Sequence On Synthesis Of Pp-G-Gma Compatibilizer For Multilayer Packaging (Mlp) Compounding,
2024
Chulalongkorn University
The Effect Of Mixing Sequence On Synthesis Of Pp-G-Gma Compatibilizer For Multilayer Packaging (Mlp) Compounding, Fitri Ayu Radini, Firda Apriyani, Yogi Angga Swasono, Reza Pahlevi Rudianto, Nonni Soraya Sambudi, Yose Fachmi Buys
Journal of Metals, Materials and Minerals
Melt recycling Multilayer Packaging (MLP) waste is difficult due to challenging separation procedures. However, blending techniques with compatibilizers can simplify MLP waste melt recycling. PP-g-GMA is a common compatibilizer in polyolefin and PET blends. PP-g-GMA compatibilizer was synthesized by utilizing an internal mixer at 175℃, 50 rpm, and 10 min using styrene as a comonomer. Titration was a method to examine effect of three different sequences of adding the BPO initiator on GMA grafting. Each sequence's PP-g-GMA samples were compounded with MLP waste using a twin-screw extruder and injection molded to make tensile test specimens. FTIR analysis shows that the …
Evaluation Of The Effect Of Strontium And Tungsten Carbide On The Microstructure Evolution, Tribological And Mechanical Behaviour Of Al-Zn-Mg-Cu-5sr-Wc Metal Matrix Composite,
2024
Chulalongkorn University
Evaluation Of The Effect Of Strontium And Tungsten Carbide On The Microstructure Evolution, Tribological And Mechanical Behaviour Of Al-Zn-Mg-Cu-5sr-Wc Metal Matrix Composite, Jeffin Johnson, Rosari Raja
Journal of Metals, Materials and Minerals
The present study focused on the experimental investigation of the metallurgical, tribological, and mechanical behavior of the developed Al-Zn-Mg-Cu-Sr-WC (Al7075-Sr-WC) metal matrix composite. The effect of the reinforcements such as strontium and tungsten carbide (WC) along with a 2 wt% magnesium as the wetting agent during the stir casting of the synthesized aluminum metal matrix composite (MMC) was investigated by varying the weight percentages. The microstructure examination was characterized using field emission scanning electron microscopy (FE-SEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) techniques. Wear analysis and mechanical testing were conducted to study the effect …
The Effect Of Printing Parameters On The Properties Of 17-4 Ph Stainless Steel Fabricated By Material Extrusion Additive Manufacturing,
2024
Chulalongkorn University
The Effect Of Printing Parameters On The Properties Of 17-4 Ph Stainless Steel Fabricated By Material Extrusion Additive Manufacturing, Phanuphak Seensattayawong, Chanun Suwanpreecha, Natthanicha Boonlert, Sukrit Songkuea, Anchalee Manonukul
Journal of Metals, Materials and Minerals
The 17-4PH stainless steel filament was characterised and utilised to study the effect of printing parameters, i.e. printing temperature, layer thickness, infill pattern and extrusion multiplier on the physical properties. The as-printed and as-sintered internal structures were analysed. The results showed that the as-printed density increases with increasing printing temperature and extrusion multiplier and decreasing layer thickness. The use of the line infill pattern also provided slightly higher as-printed density than the concentric infill pattern due to the low fraction of void between deposited paths. After sintering, the trace of these voids can be observed together with smaller-size residual pores …
