Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Engineering Science and Materials

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1741 - 1770 of 5710

Full-Text Articles in Engineering

Improvement On Cost-Performance Ratio Of Fiberglass/Carbon Fiber Hybrid Composite, Nathawat Poopakdee, Warut Thammawichai Jan 2021

Improvement On Cost-Performance Ratio Of Fiberglass/Carbon Fiber Hybrid Composite, Nathawat Poopakdee, Warut Thammawichai

Journal of Metals, Materials and Minerals

Fiberglass composite (FG) is widely used as a metal substitute in general applications due to its corrosion and chemical resistance, relatively high strength, and low cost. Still, the FG is deficient in performance and relatively heavy for airframes. Carbon fiber composite (CF) is utilized instead as it has greater performance and lower weight. However, the CF is brittle and expensive. Thus, in this work, we combine FG and CF into two types of hybrid composites to achieve a cost-effective solution with greater or comparable mechanical properties to those of CF. The first one uses FG as core and CF as …

Go to article

Efficiency Of Tri-N-Octylamine For The Liquid-Liquid Extraction Of Co (Ii) From Acidic Chloride Medium, Aishwarya Mishra, Nilam Swain, Sanghamitra Pradhan, Sujata Mishra Jan 2021

Efficiency Of Tri-N-Octylamine For The Liquid-Liquid Extraction Of Co (Ii) From Acidic Chloride Medium, Aishwarya Mishra, Nilam Swain, Sanghamitra Pradhan, Sujata Mishra

Journal of Metals, Materials and Minerals

Cobalt criticality is increasing as a function of time and this concern has impelled researchers to ascertain efficient recovery schemes of cobalt. In this paper, an extraction strategy for cobalt utilizing tri-n-octyl amine (TOA) in kerosene from acidic chloride media has been developed. The extraction percentage was found to be 76.7 using 1.5M TOA. The extracted species has been formulated as (R3NH) CoCl3 based on the findings of slope analysis. Influence of various salting out agents like NH4Cl, KCl, and NaCl on the percentage extraction has been analysed and KCl emerged as beneficial for extraction. The estimated values of enthalpy …

Go to article

Microstructure And Properties Of Zirconia-Alumina Composites Fabricated Via Powder Injection Molding, Nalattaporn Saelee, Nutthita Chuankrerkkul, Panitarn Wanakamol Jan 2021

Microstructure And Properties Of Zirconia-Alumina Composites Fabricated Via Powder Injection Molding, Nalattaporn Saelee, Nutthita Chuankrerkkul, Panitarn Wanakamol

Journal of Metals, Materials and Minerals

This study aimed to fabricate zirconia-alumina composites via powder injection molding and investigated the effects of alumina addition on microstructure as well as physical properties of the composites. Zirconia-alumina composites were prepared using polyethylene glycol (PEG) and polyvinyl butyral (PVB) as binders.  The powder loading was fixed at 38 vol%, and PEG: PVB binder weight ratio was fixed at 80:20.  Alumina content within ceramic component was varied at 0, 10, 20, 30, 40 and 50 vol% to observe the effect of alumina on the composite structures and properties. The injection molding was done at 190℃ followed by water debinding of …

Go to article

Enhancing Stability And Antioxidant Efficacy Of Fisetin By Encapsulating As Β-Cyclodextrin Inclusion Complex With Porous Polylactic Acid Film From Breath Figure, Charasphat Preuksarattanawut, Warinyupa Mangmee, Munchumas Prousoontorn, Ekasit Nisarattanaporn, Krisana Siraleartmukul Jan 2021

Enhancing Stability And Antioxidant Efficacy Of Fisetin By Encapsulating As Β-Cyclodextrin Inclusion Complex With Porous Polylactic Acid Film From Breath Figure, Charasphat Preuksarattanawut, Warinyupa Mangmee, Munchumas Prousoontorn, Ekasit Nisarattanaporn, Krisana Siraleartmukul

Journal of Metals, Materials and Minerals

This research aims to investigate the scope of fisetin (FIT)/β-cyclodextrin (β-CD) inclusion complexes with the ratios of 1:2 and 2:1 mole by means of freeze-drying, kneading and physical mixing methods (controlled process). Moreover, the complex compounds are analyzed by Fourier-Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). The results show that the most suitable preparation method of fisetin (FIT)/β-CD complex is the freeze-drying method with the fisetin (FIT) to β-CD ratio at 1:2. The emission of FIT/β-CD was investigated and it is found that the emission rate of freeze-dried FIT/β-CD in 1:2 ratio by freeze-drying method is lower than …

Go to article

Study Of Mechanical Properties And Characteristics Of Eco-Fibres For Sustainable Children's Clothing, Siti Shukhaila Shaharuddin, Marzie Hatef Jalil, Kaveh Moghadasi Jan 2021

Study Of Mechanical Properties And Characteristics Of Eco-Fibres For Sustainable Children's Clothing, Siti Shukhaila Shaharuddin, Marzie Hatef Jalil, Kaveh Moghadasi

Journal of Metals, Materials and Minerals

The aim of this paper is to study the application of eco-fibres as a new approach to achieve the multifunctional design for children’s clothing toward sustainability in the clothing industry. In this regard, this study focuses on the evaluation of the fabrics’ mechanical properties including tensile strength and microstructural details as critical points for multifunctional children's clothing purposes. The eco-fibre fabrics studied are organic cotton twill and recycled polyester. Studies have proven that frequent laundering and dry-cleaning result in increased pilling. Furthermore, high quality of colour fastness properties was found in 100% organic woven cotton fabric and recycled polyester fabric …

Go to article

Effect Of Micro Graphite Particles On The Microstructure And Mechanical Behavior Of Aluminium 6061 (Al-Mg-Si) Alloy Composites Developed By Novel Two Step Casting Technique, Madeva Nagaral, Raghavendra Pai K., V. Auradi, Bharath V., Shanawaz Patil, Mahantesh S. Tattimani Jan 2021

Effect Of Micro Graphite Particles On The Microstructure And Mechanical Behavior Of Aluminium 6061 (Al-Mg-Si) Alloy Composites Developed By Novel Two Step Casting Technique, Madeva Nagaral, Raghavendra Pai K., V. Auradi, Bharath V., Shanawaz Patil, Mahantesh S. Tattimani

Journal of Metals, Materials and Minerals

In the present research, the effect of micron sized graphite addition on the microstructure and tensile failure of Al6061 alloy has been studied. The Al6061 alloy metal matrix composites reinforced with 6, 9 and 12 varying weight percentages of graphite particles were fabricated by novel two step stir cast route which helps in improving the wettability of Al6061 alloy matrix with graphite particles. The synthesized composites were subjected to microstructural studies, density, hardness and tensile properties testing. Microstructural characterizations of obtained samples were carried out by SEM microscopy, EDS and XRD patterns. The occurrence of graphite particles were confirmed by …

Go to article

Sustainable Valorization Of Sugarcane Leaves For Succinic Acid And Biochar Production, Nuttaporn Chokesawatanakit, Pasakorn Jutakridsada, Khanita Kamwilaisak Jan 2021

Sustainable Valorization Of Sugarcane Leaves For Succinic Acid And Biochar Production, Nuttaporn Chokesawatanakit, Pasakorn Jutakridsada, Khanita Kamwilaisak

Journal of Metals, Materials and Minerals

The leaves of sugarcane (Saccharum officinarum) are agricultural waste that is burnt before harvesting. This project aims to find an alternative way to increase the value of sugarcane leaves and decrease air pollution by using the leaves as raw material to produce succinic acid and biochar. Reducing sugars were extracted from the leaves by H2SO4 hydrolysis. The sugars were then fermented by Yarrowia lipolytica TBRC 4417 to produce succinic acid. The solid residue was used as the raw material for biochar production by pyrolysis. The effects of pyrolysis temperature (350, 400, and 450℃) and nitrogen gas flow rate (5, 10, …

Go to article

Assessment Of Hydrothermal Parameters On Alkaline Activation Of Fly Ashes Using A Central Composite Design, Ivan Supelano García, César Armando Ortíz Otálora, Carlos Arturo Parra Vargas, Julieth Alexandr Mejía Gómez Jan 2021

Assessment Of Hydrothermal Parameters On Alkaline Activation Of Fly Ashes Using A Central Composite Design, Ivan Supelano García, César Armando Ortíz Otálora, Carlos Arturo Parra Vargas, Julieth Alexandr Mejía Gómez

Journal of Metals, Materials and Minerals

Coal fly ash (CFA) is a powder generated during combustion of coal; its improper disposal constitutes an environmental issue. To minimize this problem, one of the uses of CFA is as feedstock for production of zeolite. Different studies have shown that zeolites may be easily obtained from CFA by relatively cheap and fast conversion processes. Most of these studies have been focused on the study of the zeolite synthesis using classical methods through changing one factor per time and fixing the other factors, where it illustrates the impact of each variable individually via a huge number of experiments, however it …

Go to article

Debinding Behaviour And Sintering Temperature-Dependent Features Of Coloured Zirconia Fabricated By Ceramic Injection Moulding, Wantanee Buggakupta, Thanakorn Wasanapiarnpong, Nutthita Chuankrerkkul Jan 2021

Debinding Behaviour And Sintering Temperature-Dependent Features Of Coloured Zirconia Fabricated By Ceramic Injection Moulding, Wantanee Buggakupta, Thanakorn Wasanapiarnpong, Nutthita Chuankrerkkul

Journal of Metals, Materials and Minerals

Zirconia (ZrO2) is one of ceramic materials that has very good mechanical and chemical properties suitable for biomedical applications as well as other industrial applications. ZrO2 ceramics, in fact, has been used in orthodontic dentistry. Nowadays, ZrO2 has been played its role in decorative and jewelry purposes, such as watchcases and artificial stones. Ceramic injection moulding (CIM), a near-net shape manufacturing process that can produce small, complex-shaped components and is suitable for large volume production, is one of the best powder fabrication methods. In this work, CIM was carried out in order to form the coloured-ZrO2 specimens. Binders used in …

Go to article

Effects Of Annealing Treatment On Microstructure And Hardness In The 28 Wt% Cr Cast Iron With Mo/W Addition, Kittikhun Ruangchai, Ruangdaj Tongsri, John Thomas Harry Pearce, Torranin Chairuangsri, Amporn Wiengmoon Jan 2021

Effects Of Annealing Treatment On Microstructure And Hardness In The 28 Wt% Cr Cast Iron With Mo/W Addition, Kittikhun Ruangchai, Ruangdaj Tongsri, John Thomas Harry Pearce, Torranin Chairuangsri, Amporn Wiengmoon

Journal of Metals, Materials and Minerals

In this study, the effects of annealing on the hardness and microstructure of 28 wt% Cr-2.6 wt% C iron with 1.4 wt% Mo/1 wt% W addition have been investigated. The as-cast samples were heated to 800℃ and held for 4 h followed by slow cooled with a cooling rate of 20℃h-1 to 500℃. Microstructures were characterized by X-ray diffractometry, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Vickers macro-hardness and micro-hardness were measured. It was found that the as-cast microstructure in the hypoeutectic 28 wt% Cr iron without Mo or W addition consisted of primary austenite dendrite, eutectic M7C3 …

Go to article

Mechanical Properties And Ionic Conductivity Of Biodegradable Materials In Solid Polymer Electrolyte, Fatin Arhana Awang, Mohd Faiz Hassan, Khadijah Hilmun Kamarudin Jan 2021

Mechanical Properties And Ionic Conductivity Of Biodegradable Materials In Solid Polymer Electrolyte, Fatin Arhana Awang, Mohd Faiz Hassan, Khadijah Hilmun Kamarudin

Journal of Metals, Materials and Minerals

No abstract provided.

Go to article

Electrochromic Property Of Tungsten Trioxide Films Prepared By Dc Magnetron Sputtering With Oblique Angle Deposition And Thermal Oxidation, Chantana Aiempanakit, Areeya Chanachai, Nattaya Kanchai, Montri Aiempanaki, Kamon Aiempanakit Jan 2021

Electrochromic Property Of Tungsten Trioxide Films Prepared By Dc Magnetron Sputtering With Oblique Angle Deposition And Thermal Oxidation, Chantana Aiempanakit, Areeya Chanachai, Nattaya Kanchai, Montri Aiempanaki, Kamon Aiempanakit

Journal of Metals, Materials and Minerals

In this work, WO3 thin films were prepared in two steps: First, tungsten (W) films with thickness of 100-300 nm were deposited by DC magnetron sputtering with oblique angle deposition (OAD) technique at 0 and 85. Second, sputtered W films were annealed under air atmosphere at a temperature of 500℃ and different oxidation times for 1-3 h. The structure of WO3 thin films were examined by X-ray diffraction and field emission scanning electron microscope. In addition, the optical and electrochromic properties of the WO3 thin films were measured by a spectrophotometer before and after testing in potassium hydroxide electrolytes. The …

Go to article

Improvement Of Alkali Resistance Of Glass Fiber From Basalt And Lignite Bottom Ash Mixture By Addition Of Zro2 Content, Apirat Theerapapvisetpong, Phraethong Kwanpanngam, Thanapat Tamrongwongwi Jan 2021

Improvement Of Alkali Resistance Of Glass Fiber From Basalt And Lignite Bottom Ash Mixture By Addition Of Zro2 Content, Apirat Theerapapvisetpong, Phraethong Kwanpanngam, Thanapat Tamrongwongwi

Journal of Metals, Materials and Minerals

No abstract provided.

Go to article

New Views On The Ingenious Applications Of Ag Nanoparticles As A Sensor For Antibiotic Detection And As A Potent Antimicrobial Agent, Keyur Bhatt, Anita Kongor, Mohd Atharb, Vinod Jain Jan 2021

New Views On The Ingenious Applications Of Ag Nanoparticles As A Sensor For Antibiotic Detection And As A Potent Antimicrobial Agent, Keyur Bhatt, Anita Kongor, Mohd Atharb, Vinod Jain

Journal of Metals, Materials and Minerals

Nanotechnology uses exceptional approaches for the control of bacterial infections which uncovers the potential function of bio-systems at nano-scale level. Compared to silver ions, silver nanoparticles possess enhanced physicochemical stability and low bio-toxicity properties. The intrinsic chemical framework of silver nanoparticles is prone to exhibit a significant chemistry when used as sensor and as therapeutic. Nowadays, silver is used in (nano-) medicine, in the form of nanoparticles to optimize its therapeutic property for controlling infections caused by multidrug-resistant bacteria. Exclusive use of antibiotics as medicines and its discharge from the body of the infected person or animals into the sewage …

Go to article

Investigations On Phase Coexistence And Functional Properties Of Bczt Lead-Free Piezoceramic, Jirapa Tangsritrakul, Thiyanee Sonkami, Chumpon Wichittanakom, Chotiros Dokkhan, Panithi Wiroonpochit Jan 2021

Investigations On Phase Coexistence And Functional Properties Of Bczt Lead-Free Piezoceramic, Jirapa Tangsritrakul, Thiyanee Sonkami, Chumpon Wichittanakom, Chotiros Dokkhan, Panithi Wiroonpochit

Journal of Metals, Materials and Minerals

Large piezoelectric properties was observed in (1-x)BZT-(x)BCT where x=0.5 or Ba0.85Ca0.15Ti0.9Zr0.1O3 (denoted as BCZT), leading to a promising candidate for lead-free piezoelectric materials. However, phase formation of the BCZT is controversial and still unclear since various phase coexistences were identified in the literatures, for instances, the mixed phases of rhombohedral-tetragonal (R-T), ortho-rhombic-tetragonal (O-T) or rhombohedral-orthorhombic-tetragonal (R-O-T). Additionally, it is well known that the crystal structure plays a crucial role on the occurrence of polarization in the piezoceramics. Therefore, this work aims to investigate the coexistence of phase formation at room temperature for the BCZT powder and ceramic. Moreover, the electrical …

Go to article

Influence Of Precursor Preparation On The Synthesis Of Boron Carbide From Glutinous Rice Flour, Kannigar Dateraksa, Sujarinee Sinchai Jan 2021

Influence Of Precursor Preparation On The Synthesis Of Boron Carbide From Glutinous Rice Flour, Kannigar Dateraksa, Sujarinee Sinchai

Journal of Metals, Materials and Minerals

Boron carbide is a promising candidate for a variety of applications, including blasting nozzles, neutron moderators, and lightweight armor. Using of inexpensive and readily available starting materials which can react with boric acid to form B-O-C bonds, e.g., glutinous rice flour, is one of alternative means to produce high purity boron carbide powder at low temperature. In this study, boric acid and glutinous rice flour, boron and carbon sources, were used for synthesizing B4C powder by the carbothermic reduction. The mole ratios of boric acid to glutinous rice flour ranging from 1:1 to 2.5:1 were formulated and mixed by continuous …

Go to article

Effect Of Zinc-Hydroxo Species On The Growth Of One-Dimensional Zno Nanostructures, Nontakoch Siriphongsapak, Somyod Denchitcharoen Jan 2021

Effect Of Zinc-Hydroxo Species On The Growth Of One-Dimensional Zno Nanostructures, Nontakoch Siriphongsapak, Somyod Denchitcharoen

Journal of Metals, Materials and Minerals

One-dimensional ZnO nanostructures were grown on ZnO seed layer by hydrothermal method using zinc nitrate (Zn(NO3)2) and sodium hydroxide (NaOH) as precursors. The concentrations of NaOH and Zn(NO3)2 were varied from 40 mM to 680 mM and kept constant, respectively. Effects of increasing the hydroxide ions on the concentration of zinc-hydroxo species in the solution were studied using thermodynamic simulation software. The simulated results showed that Zn(OH)2 and Zn(OH)3- concentrations tended to decrease but Zn(OH)42- was non-linearly increased when the concentration of NaOH at room temperature was increased. After the growth of ZnO, the samples were characterized by FESEM and …

Go to article

Experimental And Numerical Characterization Of Fatigue Crack Propagation In High-Speed Railway Wheel Er8 Steel, Chaichayo Suetrong, Vitoon Uthaisangsuk Jan 2021

Experimental And Numerical Characterization Of Fatigue Crack Propagation In High-Speed Railway Wheel Er8 Steel, Chaichayo Suetrong, Vitoon Uthaisangsuk

Journal of Metals, Materials and Minerals

In this work, characteristics of fatigue crack growth in the Paris regime of the rail wheel steel grade ER8 were investigated. Experimental crack growth tests under different cyclic loads of a compact tension (CT) specimen and corresponding FE simulations were carried out. The extended FE method (XFEM) coupled with damage evolution based on the strain energy release rate or the Paris law was applied to describe the crack propagation mechanism in the tested CT samples. Hereby, the fatigue fracture model parameters were firstly determined from the experimental data. It was found that the predicted crack growth rates agreed well with …

Go to article

Effect Of Cladding Of Stellite-6 Filler Wire On The Surface Of Ss316l Alloy Through Cold Metal Arc Transfer Process, Thinesh Babu Thiagarajan, Sengottuvel Ponnusamy Jan 2021

Effect Of Cladding Of Stellite-6 Filler Wire On The Surface Of Ss316l Alloy Through Cold Metal Arc Transfer Process, Thinesh Babu Thiagarajan, Sengottuvel Ponnusamy

Journal of Metals, Materials and Minerals

In this work, Cladding was done on SS316L alloy through the CMT process using Stellite-6 filler wire. 31 experiments were done at different welding conditions as per CCD matrix. The cladding specimens were characterized by macro and micro-study, Vickers microhardness evaluation and corrosion resistance analysis. An optical microscope, SEM-EDAX, and XRD were used to predict the structural characterizations, presence and the distributions of the elements. Based on the study higher voltage & welding speed showed appreciable hardness at the interface & cladding regions. The thickness of the interface was noted at a maximum of 190 μm. The EDS spectra showed …

Go to article

Development And Characterization Of Sic Fiber Reinforced B4c Composite, Jitendra Kumar Sonber, Sanjib Majumdar, Vivekanand Kain Jan 2021

Development And Characterization Of Sic Fiber Reinforced B4c Composite, Jitendra Kumar Sonber, Sanjib Majumdar, Vivekanand Kain

Journal of Metals, Materials and Minerals

This study is conducted to investigate the effects of silicon carbide short fiber (SiCf) reinforcement on processing and properties of boron carbide ceramic. Studies have been carried out on the hot pressing, mechanical property measurement, microstructure evolution and oxidation study of SiCf reinforced B4C composite. B4C-SiCf composites have been prepared by hot pressing at 1950℃ with varying SiCf content in the range of 10 vol% to 30 vol%. All the composites are densified to near theoretical density. It is noticed that hardness of composite is decreased and fracture toughness of composite is increased by addition of SiC fiber. Hardness of …

Go to article

Facile Purification Of Locally Mined Gypsum And Its Use For Preparing Nano-Hemihydrates, Luqman Ayodeji Adams, Enobong Essien, Taiwo Aiyeloro, Stella Oseyomon, John Makanjuola Jan 2021

Facile Purification Of Locally Mined Gypsum And Its Use For Preparing Nano-Hemihydrates, Luqman Ayodeji Adams, Enobong Essien, Taiwo Aiyeloro, Stella Oseyomon, John Makanjuola

Journal of Metals, Materials and Minerals

Gypsum has a wide range of applications, in interior decorations, building construction, supplements or implants in orthopaedics to mention a few. However, in many developing countries including Nigeria, there is still a large-scale importation despite huge available natural deposits. In this study, a facile method to purify locally-mined gypsum has been explored based on the mineral retrograde solubility in water. The purified gypsum was investigated for its elemental composition in comparison to the crude sample and a commercially obtained medical-grade gypsum using X-ray fluorescence (XRF). The results showed that the purified gypsum contained 94.05% CaSO4 compared with the crude which …

Go to article

Efficiency Of 2-Dodecylaminopyridine For The Liquid-Liquid Extraction Of Gold(Iii) From Succinic Acid Medium, Umrao Shep, Rucha Pawar, Balasaheb Arbad Jan 2021

Efficiency Of 2-Dodecylaminopyridine For The Liquid-Liquid Extraction Of Gold(Iii) From Succinic Acid Medium, Umrao Shep, Rucha Pawar, Balasaheb Arbad

Journal of Metals, Materials and Minerals

Extractive recovery of gold(III) from succinic acid solution with high molecular weight amine: 2-dodecylaminopyridine (2-DDAP) as a new extractant in xylene has been investigated. Extraction data indicates that 5 × 10-4 mol⋅L-1 2-DDAP is a very efficient and fast extractant. Gold(III) can be effectively extracted (D = 414.16) with 2-DDAP from 0.04 M succinic acid solution. The equilibrium of gold(III) from aqueous phase of succinic acid with 2-DDAP is achieved within 60 sec. The extraction of gold(III) with 2-DDAP proceed at the interface according to ion pair formation mechanism. The best stripping solution from among the studied ones is the …

Go to article

Effect Of Dc Power On The Thickness, Hardness And Adhesion Strength Of Ti-51 At% Ni Coated Ti/Tin, Ishiaka Shaibu Arudi, Esah Hamzah, Muhammad Azizi Mat Yajid, Bushroa Abdul Razak Jan 2021

Effect Of Dc Power On The Thickness, Hardness And Adhesion Strength Of Ti-51 At% Ni Coated Ti/Tin, Ishiaka Shaibu Arudi, Esah Hamzah, Muhammad Azizi Mat Yajid, Bushroa Abdul Razak

Journal of Metals, Materials and Minerals

The coating of Ti/TiN was successfully deposited on Ti-51 at% Ni substrates by using direct current (DC) magnetron sputtering technique and the effect of different sputtering power on the thickness, surface hardness and adhesion strength of the coatings were studied. The microstructural characterization was carried out using scanning electron microscope (SEM), energy-dispersive X-ray (EDX) and X-ray diffractometer (XRD). The coating thicknesses were detected and measured using SEM. The surface hardness test was performed using microhardness tester, and the adhesion strength was carried out by scratch testing. The results showed that the TiN crystallites growth orientation, thickness, surface hardness and adhesion …

Go to article

Developments Of Biodegradable Polymer Based On Polylactic Acid (Pla) With Natural Color Extracts For Packaging Film Applications, Worraphol Nansu, Passarawan Chaiwut, Sukunya Ross, Gareth Ross, Nungruthai Suphrom, Sararat Mahasaranon Jan 2021

Developments Of Biodegradable Polymer Based On Polylactic Acid (Pla) With Natural Color Extracts For Packaging Film Applications, Worraphol Nansu, Passarawan Chaiwut, Sukunya Ross, Gareth Ross, Nungruthai Suphrom, Sararat Mahasaranon

Journal of Metals, Materials and Minerals

This research was interested in the use of natural colorants to replace hazardous synthetic pigments in the plastic polymer industry. The natural colors were selected from local plants indigenous to southeast Asia, which were Hibiscus sabdariffa roselle calyx (RS) and Caesapinia sappan Linn heartwood (SP). Natural colorant extracts were used as additives in poly(lactic acid ) (PLA). These were manufactured using a twin screws extruder and blow film extruder to obtain biodegradable thin films for use as packaging materials. Biodegradable films were characterized by color index, light barrier properties, water vapor transmission (WVTR), morphology, mechanical and chemical properties. The results …

Go to article

Effects Of Delay Time And Curing Temperature On Compressive Strength And Porosity Of Ground Bottom Ash Geopolymer Mortar, Nattapong Makaratat, Sumrerng Rukzon, Prinya Chindaprasirt Jan 2021

Effects Of Delay Time And Curing Temperature On Compressive Strength And Porosity Of Ground Bottom Ash Geopolymer Mortar, Nattapong Makaratat, Sumrerng Rukzon, Prinya Chindaprasirt

Journal of Metals, Materials and Minerals

This research investigated development of ground bottom ash (GBA) for a new geopolymer material. The compressive strength and porosity of the geopolymer mortar containing GBA were tested. The GBA-based geopolymer mortar mixtures were designed by control liquid to GBA ratio for all tests. Extra water was also used to maintain the workability of geopolymer mortar. The sodium hydroxide (NaOH) concentrations of 10 M and 15 M were used. Furthermore, sodium silicate (Na2SiO3) to sodium hydroxide (NaOH) ratios by mass such as 0.50, 1.50 and 2.50 were also used as alkali activator solutions. Effects of delay time and no-delay time, heat …

Go to article

A Review Of Rice Husk Silica As A Heterogeneous Catalyst Support, Izzati Nasir, Nadiah Ameram, Arlina Ali, Siti Roshayu Hassan, Nurul Akmar Che Zaudin, Jamil Mohamed Sapari Jan 2021

A Review Of Rice Husk Silica As A Heterogeneous Catalyst Support, Izzati Nasir, Nadiah Ameram, Arlina Ali, Siti Roshayu Hassan, Nurul Akmar Che Zaudin, Jamil Mohamed Sapari

Journal of Metals, Materials and Minerals

The yield of amorphous silica has less residue of mineral content in rice husk (RH) and a high specific surface area through the simple alkaline extraction process at first, then acid precipitation of RH. At this time, the leaching process using alkali and calcination of RH is the best method to acquire amorphous silica with a high surface area. The different temperatures were used for the calcination of RH and continue with sodium hydroxide (NaOH) treatment by using different concentration. The sample titrated using hydrochloric acid (HCl) to extract silica. Pretreatment with acid leaching for the RH was also conducted …

Go to article

Enhanced Mechanical And Thermal Properties Of Fly Ash-Based Geopolymer Composites By Wollastonite Reinforcement, Khanthima Hemra, Takaomi Kobayashi, Pavadee Aungkavattana, Sirithan Jiemsirilers Jan 2021

Enhanced Mechanical And Thermal Properties Of Fly Ash-Based Geopolymer Composites By Wollastonite Reinforcement, Khanthima Hemra, Takaomi Kobayashi, Pavadee Aungkavattana, Sirithan Jiemsirilers

Journal of Metals, Materials and Minerals

The present study investigated the mechanical and thermal properties of geopolymer composite. The geopolymer composite was prepared by mixing fly ash and wollastonite with the alkaline activator, which was 6 M KOH:K2SiO3 in a mass ratio of 1:1 and a solid:liquid mass ratio of 3:2. The compressive strength at 28 days of geopolymer was 33.3 MPa and possessed the highest strength of 38.3 MPa when 30 wt% wollastonite was added. The flexural strength presented differently whereby it increased from 2.1 MPa to 6.8 MPa. It increased remarkably up to 200% with the addition of 50 wt% wollastonite. The geopolymer composites …

Go to article

Raman Signal Enhancement Of Low-Cost Metal Sheet Sers With Gold Decoration, Nampueng Pangpaiboon, Kawinphob Phetnam, Sukon Kalasung, Chanunthorn Chananonawathorn, Viyapol Patthanasettakul, Mati Horprathum, Pitak Eiamchai, Noppadon Nuntawong, Saksorn Limwichean Jan 2021

Raman Signal Enhancement Of Low-Cost Metal Sheet Sers With Gold Decoration, Nampueng Pangpaiboon, Kawinphob Phetnam, Sukon Kalasung, Chanunthorn Chananonawathorn, Viyapol Patthanasettakul, Mati Horprathum, Pitak Eiamchai, Noppadon Nuntawong, Saksorn Limwichean

Journal of Metals, Materials and Minerals

Surface Enhance Raman Spectroscopy (SERS) is a sensitive surface creating plasmonic resonance for the Raman scattering. SERS is considered as a powerful technique to enhance the Raman signal, when quantity of sample is limited. Recently, our lab team has discovered a low-cost SERS template fabrication, laser-engraving method, which is suitable with gold nanoparticles decoration. In this work, two different materials, zinc and copper, are used as metal sheet SERS substrate. Gold nanoparticles sputtered with 270 s of sputtering time are used as decorated noble metal. FE-SEM images illustrate the nano-in-microstructure of the engraved metal sheets. The decorated Au nanoparticles are …

Go to article

Oxidation Behavior Of Sn-1 Wt% Bi Alloy In Air And Deionized Water At Room Temperature, Tanavut Naravuthichai, Patama Visuttipitukul, Sirichai Leelachao, Tachai Luangvaranunt Jan 2021

Oxidation Behavior Of Sn-1 Wt% Bi Alloy In Air And Deionized Water At Room Temperature, Tanavut Naravuthichai, Patama Visuttipitukul, Sirichai Leelachao, Tachai Luangvaranunt

Journal of Metals, Materials and Minerals

Formation of tin oxides on surface Sn-1 wt% Bi alloy lapping plates causes interactions with protrusions of embedded diamond grits, and reduces the efficiency of the lapping process. The rate and type of oxide formation were investigated to understand the problem. Electrochemical analysis was performed to characterize the oxide film thickness, and x-ray photoelectron spectroscopy was performed to characterize the tin oxide species. Oxidation in air at room temperature reaches a thickness of 23 Å after 72 h. Oxidation in deionized water at room temperature has a faster growth rate, and reaches a thickness of 33 Å after 72 h. …

Go to article

Mechanical Performance Of Woven Carbon Reinforced Epoxy Composites With Varied Orientation Angle, Sweety Ashish Agrawal, Someshwar Bhattacharya Jan 2021

Mechanical Performance Of Woven Carbon Reinforced Epoxy Composites With Varied Orientation Angle, Sweety Ashish Agrawal, Someshwar Bhattacharya

Journal of Metals, Materials and Minerals

The mechanical properties of woven carbon fibre reinforced epoxy composites laminated with different orientation angle in stacking sequence were investigated. Woven fabric layers with different linear density carbon tow have been produced on modified rigid rapier sample loom and impregnated with epoxy by hand lay-up technique for composite preparation. Curing of composite was carried out at room temperature for 2 h. Five different laminar composites were prepared with different orientation angles [(0/0/0/0), 0/+30/-30/0, 0/+45/-45/0, 0/+60/-60/0 and 0/+90/-90/0]. The mechanical properties like tensile, flexural, and impact test) were analysed in both longitudinal and transverse directions. Physical properties such as density and …

Go to article

First Prev Next Last