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Articles 481 - 510 of 906
Full-Text Articles in Materials Science and Engineering
Microstructure Evolution And Mechanical Properties Of Calcined Kaolin Processing Waste-Based Geopolymers In The Presence Of Different Alkaliactivator Content By Pressing And Casting, Sitthisak Prasanphan, Anucha Wannagon, Takaomi Kobayashi, Sirithan Jiemsirilers
Microstructure Evolution And Mechanical Properties Of Calcined Kaolin Processing Waste-Based Geopolymers In The Presence Of Different Alkaliactivator Content By Pressing And Casting, Sitthisak Prasanphan, Anucha Wannagon, Takaomi Kobayashi, Sirithan Jiemsirilers
Journal of Metals, Materials and Minerals
In this work, microstructure evolution and mechanical properties of calcined kaolin processing waste-based geopolymers in the presence of low and high contents alkali activators were studied. Lower and higher contents of alkali activators were employed to synthesize geopolymers by pressing and casting methods, respectively. Chemicalbonding analysis, microstructure/elemental analysis, phase composition analysis, and compressive strength test were performed using FTIR, SEM/EDX, XRD, anduniversal mechanical testing machine, respectively. Findings showed that geopolymer with the low content of alkali activator formed by pressing (pressed geopolymer) might promote in the higher degree of geopolymerization because of higher compacted matrices but geopolymer with the high …
Retention Of Amorphous Silica In Rice Hulls At High Temperatures, Takeshi Okutani
Retention Of Amorphous Silica In Rice Hulls At High Temperatures, Takeshi Okutani
Journal of Metals, Materials and Minerals
Rice hulls contain around 20 wt% amorphous silica (rice hull silica). Rice hullsilica containing no potassium impurity crystallized from amorphous silica to cristobaliteat 1300C. When a small amount of MgO or -Fe2O3 or Al2O3 were added to the rice hull silica, the rice hull silica crystallized to cristobalite at 1500C. MgO, -Fe2O3 and Al2O3 diffused to silica as Mg2+, Fe3+ and Al3+ at high temperatures. These ions broke the SiO4 tetrahedron network, so that the amorphous state of rice hull silica was maintained. As sintering occurred at 1500C in rice hull silica mixed with additives such as MgO, the melting …
Solid Particle Erosive Wear Behaviour Of Flame Sprayed Eva Based Polymeric Coatings, Ekrem Altuncu, Barış Önen
Solid Particle Erosive Wear Behaviour Of Flame Sprayed Eva Based Polymeric Coatings, Ekrem Altuncu, Barış Önen
Journal of Metals, Materials and Minerals
Flame spraying of polymers allows obtaining functional coatings for protecting against wear and corrosion. Among many engineering polymers, the Ethylene-Vinyl Acetate (EVA) copolymer attracts attention with its superior mechanical and chemical properties. EVA, which has high chemical resistance, high impact resistance and mechanical flexibility, high friction coefficient, is among the candidate coating material that can be used in aerospace, automotive, marine, chemical and manufacturing industries to protect metallic surfaces. The use of polymeric coatings in applications is often restricted when large surfaces need to be coated or if the coating needs to be applied in the openair field. Flame spraying …
Tribological Properties Of Polymeric Composites: A Review, Yusuf Şahin, Hakan Şahin
Tribological Properties Of Polymeric Composites: A Review, Yusuf Şahin, Hakan Şahin
Journal of Metals, Materials and Minerals
Tribology deals with interacting surfaces in sliding, rolling or any others types of motions, which is much importance in designing for machine components to improve their durability's of mechanical engineering systems. This study overviews the most recent studies on the tribological behavior of polymeric based materials containing different fillers. Some microstructural and mechanical properties of the epoxy composite are introduced. In addition, mechanisms of increasing wear resistance and reducing friction coefficient for polymeric composites are reviewed. An overview is also covered the process optimization for the dry wear results of polymeric composites using Taguchi Method (TM) and Response Surface Method …
Ceramic And Glass-Ceramic Fillers In Dental Composites: A Review, Sumana Ghosh
Ceramic And Glass-Ceramic Fillers In Dental Composites: A Review, Sumana Ghosh
Journal of Metals, Materials and Minerals
Dental composite fillings are most popular fillings wherein various fillers have been suitably dispersed in a polymerizable resin. Major challenges are to make choice of suitable filler and their distribution in the resin matrix in the development of the dental fillings. Apart from traditional fillers ceramic whiskers, glass fibres, branched fibres and nanoporous powders have also been investigated as fillers in dental composites. Recently, ceramic, and glass-ceramic fillers are attracting attention of the researchers due to their suitable combination of material properties. In the current paper, the prospect of ceramic and glass-ceramics as fillers in fabricating dental composites has been …
Insearchfornear-Room-Temperaturesuperconductingcriticaltemperatureofmetalsuperhydridesunderhighpressure: A Review, Udomsilp Pinsook
Insearchfornear-Room-Temperaturesuperconductingcriticaltemperatureofmetalsuperhydridesunderhighpressure: A Review, Udomsilp Pinsook
Journal of Metals, Materials and Minerals
An overview and the latest status of the superconductivity of metal superhydrides under high pressure are discussed in this review article. The searching for near-room-temperature superconductors have been one of the most enthusiastic fields in physics. This is because of several key factors in both theoretical and experimental sides. By advanced experiment innovation, pressure exceeded that of the earth's core can be generated in laboratories. This allows scientists to explore new physics of materials under high pressure. In the synergy form, the theoretical calculation gives accountable predictions on the structural and electronic properties which can be served as a practical …
Synthesis And Characterization Of Ball-Milled Eggshell And Al2o3 Reinforced Hybrid Green Composite Material, Shrawan Kumar, Shashi Prakash Dwivedi, Vijay Kumar Dwived
Synthesis And Characterization Of Ball-Milled Eggshell And Al2o3 Reinforced Hybrid Green Composite Material, Shrawan Kumar, Shashi Prakash Dwivedi, Vijay Kumar Dwived
Journal of Metals, Materials and Minerals
Eggshell is a by-product (a secondary product derived from a production process) which produces lots of environment pollution. However, some environment pollution can be reduced by utilizing this waste. In the present investigation, an attempt was made to utilize eggshell as the reinforcement material with alumina (Al2O3) in the development of composite material. Carbonized eggshell particles and Al2O3 ceramic particles were ball-milled up to 100 hours to obtain a uniform particle size of reinforcement particles. Results showed that by using Al2O3 with eggshell in the development of aluminium based composite material after the ball-milling, mechanical properties were significantly improved. However, …
Production Of Silica-Based Ceramics Sintered Under Nitrogen Atmosphere From Rice Husk And Sugarcane Bagasse Ash, Wiphawan Khopthong, Benya Cherdhirunkorn
Production Of Silica-Based Ceramics Sintered Under Nitrogen Atmosphere From Rice Husk And Sugarcane Bagasse Ash, Wiphawan Khopthong, Benya Cherdhirunkorn
Journal of Metals, Materials and Minerals
Nitride silica-based ceramics were prepared by sintering under nitrogen atmosphere using rice husk ash and bagasse ash as raw materials. X-ray Fluorescence Spectrometry (XRF) and X-ray Diffractometor (XRD) studies revealed that the main phase of rice husk ash (after calcined at 600C for 6 h.) was amorphous silica, whereas the sugarcane bagasse ash contained quartz and CaCO3. Thus, both ashes would be a good source for silica. Two batches of the 100 wt% rice husk ash (RHA100) and the mixture of 50 wt% rice husk ash and 50 wt% bagasse ash (RHA50BA50) were wet milled using planetary ball milling machine, …
Green-Based Corrosion Protection For Mild Steel In 3.5% Nacl And Distilled Water Medias: Jatropha Curcas And Roselle Extracts, Muhammad A. Afandi, Safaa N. Saud, Esah Hamzah
Green-Based Corrosion Protection For Mild Steel In 3.5% Nacl And Distilled Water Medias: Jatropha Curcas And Roselle Extracts, Muhammad A. Afandi, Safaa N. Saud, Esah Hamzah
Journal of Metals, Materials and Minerals
In this study, the natural sources of Jatropha curcas and Hibiscus Sabdariffa calynx (Roselle) extracts as green corrosion inhibitors were employed to improve the corrosion resistance of mild steel in simulated (3.5% NaCl) and distilled water medias. The inhibiting performance of two types of extracts was studied by visual inspection, microscope analysis, and various electrochemical measurements and the data of corrosion rate were statistically analyzed. The main phenolic compounds of Jatropha and Roselle extracts were confirmed via a liquid chromatography-mass spectrometry. Meanwhile, the functional groups of active phytochemical compounds were characterized via attenuated total reflection spectroscopy (ATR). The results of …
Properties Of Wood-Plastic Composites Based On Pvc/Pla/Pbat Ternary Blend, Laksamon Raksaksri, Phasawat Chaiwutthinan, Amnouy Larpkasemsuk, Saowaroj Chuayjuljit, Anyaporn Boonmahitthisud
Properties Of Wood-Plastic Composites Based On Pvc/Pla/Pbat Ternary Blend, Laksamon Raksaksri, Phasawat Chaiwutthinan, Amnouy Larpkasemsuk, Saowaroj Chuayjuljit, Anyaporn Boonmahitthisud
Journal of Metals, Materials and Minerals
The objective of this work was to improve mechanical properties, thermal resistance, and biodegradability of poly(vinyl chloride) (PVC) by the addition of poly(lactic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT), and wood flour (WF). The samples made from a mixture of PVC/PBAT exhibited the highest impact and tensile properties, while properties of the samples made from PVC/PLA had the highest flexural and thermal properties, PVC/PLA/PBAT mixed samples exhibited average mechanical properties. The addition of WF to all the blends increased impact strength, flexural properties, Young's modulus, thermal resistance, and biodegradability of the samples in comparison to those of the neat PVC and …
Synthesis Of Hydroxyapatite From Cuttlebone Under Various Ph Conditions: An Approach For Medical Materials, Sineenart Kangkan, Premjit Arpornmaeklong, Sarute Ummartyotin
Synthesis Of Hydroxyapatite From Cuttlebone Under Various Ph Conditions: An Approach For Medical Materials, Sineenart Kangkan, Premjit Arpornmaeklong, Sarute Ummartyotin
Journal of Metals, Materials and Minerals
To support the bio-based economy, development on hydroxyapatite from cuttlebone was investigated. Cuttlebone is naturally occurring source of calcium. We calcined it at 700°C for 4 h to form a calcium oxide powder. Hydroxyapatite was coprecipitated with calcium oxide powder and phosphoric acid. The effect of the pH ranging from 6 - 10 was controlled by adding ammonium hydroxide. Fourier transform infrared and X-ray diffraction were employed to characterize the structural properties of the hydroxyapatite. Changes in pH did not affect the structural properties of the hydroxyapatite. Thermogravimetric analysis revealed that the hydroxyapatite was thermally stable up to 700°C. At …
Xas Analysis Of Copper Binding In Soils, Wapakorn Siriwong, Penphitcha Amonpattaratkit, Wantana Klysubun
Xas Analysis Of Copper Binding In Soils, Wapakorn Siriwong, Penphitcha Amonpattaratkit, Wantana Klysubun
Journal of Metals, Materials and Minerals
Ecological distribution of copper from soil is depended on its bioavailability and mobility. Copper binding on heterogeneous soil composition is a key information for understanding the long-term fate benefiting suitable management practice for copper in the environment. X-ray absorption spectroscopy (XAS) techniques were used to provide microscopic scale information of copper-binding on different soils. Soil samples containing 14.9-56.6% clay and 0.5-3.4% organic matter were studied. Dry-powder soil samples containing approximated 0.3% copper from batch equilibrated equilibrium experiments were analyzed. Copper K-edge spectrum were collected at the Synchrotron light research institute (SLRI), Thailand in X-ray absorption near edge structure (XANES) and …
Preparation Of Alginate/2-Hydroxyethyl Methacrylate Composite Beads: Role Of Fillers And Characteristics Of Bead Formation, Somkiet Urusetthanon, Somchai Udon, Boonsri Kusuktham
Preparation Of Alginate/2-Hydroxyethyl Methacrylate Composite Beads: Role Of Fillers And Characteristics Of Bead Formation, Somkiet Urusetthanon, Somchai Udon, Boonsri Kusuktham
Journal of Metals, Materials and Minerals
In this research, alginate composite beads were prepared. The objective was to study the effect of particle size of fillers on the viscosity of alginate solution and bead formation. The sodium alginate solution with and without 2-hydroxyethyl methacrylate was dropped into calcium chloride to form the beads. The polymerization of the 2-hydroxyethyl methacrylate in the alginate matrix was occurred by using potassium persulphate as an initiator and N,N/-methylenebisacrylamide as a crosslinking agent and N,N,N/,N/ -tetramethylethylenediamine in the calcium chloride solution as an accelerator. For the preparation of the composite beads, the cotton dust, and sawdust at various ratios were mixed …
Effect Of Polystyrene Molecular Weight And Zinc Oxide Concentration On Dewetting Behavior Of Polymeric Thin Films, Kattaleeya Sujaroon, Phanawan Whangdee, Nampueng Pangpaiboon
Effect Of Polystyrene Molecular Weight And Zinc Oxide Concentration On Dewetting Behavior Of Polymeric Thin Films, Kattaleeya Sujaroon, Phanawan Whangdee, Nampueng Pangpaiboon
Journal of Metals, Materials and Minerals
The separation between ultra-thin polymer film on metal oxide substrate is called dewetting. Dewetting causes the polymer films to loss their stability and other important properties, for example, the films may short circuit or reduce their transparency. Therefore, the stability of polymer thin films on substrate need to be improved. Addition of nanoparticles is one of the most popular technique used to increase the stability of polymer thin films. The correlation between the different of molecular weight and ZnO concentration on dewetting behavior was studied in this research. The appropriate concentration of ZnO on dewetting suppression in each molecular weight …
Effects Of Sodium Silicate As Liquid Phase Sintering Additives On Properties Of Alumina Ceramics, Kanyapak Siriphaisarntavee, Charusporn Mongkolkachit, Mateekul Jiarawattananon, Karn Serivalsatit, Thanakorn Wasanapiarnpong
Effects Of Sodium Silicate As Liquid Phase Sintering Additives On Properties Of Alumina Ceramics, Kanyapak Siriphaisarntavee, Charusporn Mongkolkachit, Mateekul Jiarawattananon, Karn Serivalsatit, Thanakorn Wasanapiarnpong
Journal of Metals, Materials and Minerals
This research focused on the production of high-performance alumina products. The feasibility of using soluble alkali silicate in liquid phase sintering of alumina was studied. Liquid soluble alkali silicate was used to enhance the plastic forming of alumina and formed liquid phase sintering to attain fired alumina products with high strength, high alumina content and low water absorption. The methodology consisted of the mixing of organic binder with sodium silicate (Na2SiO3), used as liquid phase sintering additive, of 0-15 wt%. Magnesium carbonate (MgCO3), used as the grain growth inhibitor, of 0-1 wt% were added and followed by alumina powders. The …
Synthesis And Fabrication Of Polyaniline/Eggshell Composite In Ammonia Detection, Nurul Aqilla Mazlan, Jamil M. Sapari, Kavirajaa Pandian Sambasevam
Synthesis And Fabrication Of Polyaniline/Eggshell Composite In Ammonia Detection, Nurul Aqilla Mazlan, Jamil M. Sapari, Kavirajaa Pandian Sambasevam
Journal of Metals, Materials and Minerals
This study focuses on the measurement and performance of bio-filler composite based on polyaniline (PANI)/chicken eggshell (CES). The composite films were prepared via ex-situ polymerisation using DBSA as its dopant. The PANI solution was distributed equally before mixing it with three different ratios of CES powder. Characterisations of the composite films were analysed using Fourier-transform infrared spectroscopy (FTIR) and Ultraviolet-visible spectroscopy (UV-Vis), Scanning electron microscope/energy dispersive x-ray (SEM/EDX) and multimeter. PANI film that contained 20mg CES filler possessed the highest conductivity and the fastest time to achieve 90% of sensitivity. The film was also very selective towards ammonia gas and …
Tribology, Mechanical Properties And Coloration Of A Mica Glass-Ceramic, Sahadsaya Prasertwong, Sukanda Angkulpipat, Thapanee Srichumpong, Kallaya Suputtamongkol, Chanchana Thanachayanont, Ramona Sola4, Greg Heness, Cristina Leonelli, Duangrudee Chaysuwan
Tribology, Mechanical Properties And Coloration Of A Mica Glass-Ceramic, Sahadsaya Prasertwong, Sukanda Angkulpipat, Thapanee Srichumpong, Kallaya Suputtamongkol, Chanchana Thanachayanont, Ramona Sola4, Greg Heness, Cristina Leonelli, Duangrudee Chaysuwan
Journal of Metals, Materials and Minerals
The research employed pigments, Fe2O3 and CeO2, into the glass frit for adjustable mechanical properties and coloration. Disc samples were prepared to determine microstructures and mechanical properties in terms of tribology and nano-indentation hardness as well as biaxial flexural strength. The glass system presented the crystalline phases, by XRD, of phlogopite Ca-mica, fluorapatite, stishovite, anorthite and strontium apatite. Furthermore, SEM micrographs revealed rod-like microstructures and parent glass phase in all specimens 1) GC, 2) GC + 1wt% CeO2, 3) GC + 0.1wt% Fe2O3 and 4) GC + 1wt% CeO2 + 0.1wt% Fe2O3. For the tribology test, specimens were tested by …
Dry-Sliding Wear Of The 316l/H-Bn Composites Produced Under Crack Ammonia Atmosphere, Ekkarat Chusong, Panya Kansuwan, Naoto Ohtake, Pongsak Wila, Nattaya Tosangthum, Ruangdaj Tongsri
Dry-Sliding Wear Of The 316l/H-Bn Composites Produced Under Crack Ammonia Atmosphere, Ekkarat Chusong, Panya Kansuwan, Naoto Ohtake, Pongsak Wila, Nattaya Tosangthum, Ruangdaj Tongsri
Journal of Metals, Materials and Minerals
Wear is one of different problems in mechanical failures of moving components. When a component encounters friction force on its surface, crack initiation tends to occur and wear follows crack propagation. Thus, the moving parts of automobiles should have proper wear resistance for long-time services, in addition to having high strength and hardness for heavy load operation. A self-lubricating material with compromised tribological and mechanical properties is important for some moving components. In this work, self-lubricating composites, metal matrix composites embedded with a solid lubricant, made from 316L stainless steel powder mixed with different hexagonal boron nitride (h-BN) contents of …
Selection Of Blowing Agent For Metal Foam Production: A Review, Ankur Bisht, Brijesh Gangil, Vinay Kumar Patel
Selection Of Blowing Agent For Metal Foam Production: A Review, Ankur Bisht, Brijesh Gangil, Vinay Kumar Patel
Journal of Metals, Materials and Minerals
Metal foams are cellular solids in which gas is uniformly distributed throughout the metal matrix. One of the cheapest ways of evolving the gas is introducing the blowing agent in parent metal in liquid state. A blowing agent is defined as a material that decomposes under the presence of heat and releases gas which then propels the foaming process. The quality of final foam is influenced by several parameters such as composition, size and volume fraction of the blowing agent used. Different chemicals which can evolve gases such as carbonates and metal hydrides fit into the description of blowing agent. …
An Approach To Search The Potentiality Of Node In Bamboo Strip Reinforced Composites, Mohammad Irfan Iqbal, Rashed Al Mizan, Ayub Nabi Khan
An Approach To Search The Potentiality Of Node In Bamboo Strip Reinforced Composites, Mohammad Irfan Iqbal, Rashed Al Mizan, Ayub Nabi Khan
Journal of Metals, Materials and Minerals
Bamboo has recently entered the composite sector with some attractive labels such as 'green'. The current commercial manufacturing method of bamboo composite removes the node's portion of bamboo culm during bamboo processing. This method generates a high amount of solid waste materials along with processing complexity and the scientific merit of this practice is also questionable. This research investigates the effects of culm nodes on bamboo based composite properties. In this study an approach to produce bamboo strips reinforced epoxy composites and their mechanical properties (e.g. tensile, flexural and impact properties) were reported. It was demonstrated that mechanical properties of …
Preparation And Characterization Of Lake Pigments From Sappan Wood Using Thai Local Clays, Jitnapa Sirirak, Nattawan Worawannotai, Cheewita Suwanchawalit, Supanee Chayabutra
Preparation And Characterization Of Lake Pigments From Sappan Wood Using Thai Local Clays, Jitnapa Sirirak, Nattawan Worawannotai, Cheewita Suwanchawalit, Supanee Chayabutra
Journal of Metals, Materials and Minerals
Thai local clays: Munpoo clay (MC) and Dindang clay (DC) were utilized as the adsorbents for preparation of the lake pigments from sappan wood. The lake pigment which was prepared by using MC as the adsorbent (L-MC) appeared reddish-brown while a deeper reddish-brown color of the lake pigment (L-DC) was obtained by using DC as the adsorbent. Characterization of MC, DC, L-MC, and L-DC was accomplished by XRD, SEM, FT-IR, BET, TGA and UV-Vis DRS. The effects of adsorbent dosage, pH of sappan wood extract and time on the adsorption were also investigated. The results revealed that silicon oxide and …
Poly(Ester Urethane)-Crosslinked Carboxymethylchitosan As A Highly Water Swollen Hydrogel, Nunthiya Deepuppha, Apiwat Kadnaim, Boonjira Rutnakornpituk, Metha Rutnakornpituk
Poly(Ester Urethane)-Crosslinked Carboxymethylchitosan As A Highly Water Swollen Hydrogel, Nunthiya Deepuppha, Apiwat Kadnaim, Boonjira Rutnakornpituk, Metha Rutnakornpituk
Journal of Metals, Materials and Minerals
This work focused on the synthesis and characterization of carboxymethylchitosan (CMC)-based hydrogels modified with polyester-containing polyurethane (PU). The polyester was first synthesized from the condensation between 1,6-hexane diol and malonic acid, then reacted with an excess of 1,6-hexamethylene diisocyanate (HDI), and followed by the reaction with ethylene glycol as a chain extender to gain PU. CMC was chemically crosslinked with a water soluble crosslinker in the presence of 1-60 wt% of PU to obtain highly water swollen CMC hydrogels. Upon addition of PU, the CMC hydrogel showed excellent water swellability (up to 400 times of the dried weight), and it …
The Luminescence, Optical, And Structural Properties Of Srmoo4:Ce3+ Phosphor For Photonics Material Applications, Eakgapon Kaewnuam, Nuanthip Wantana, Sasithorn Saikaew, Jakrapong Kaewkhao
The Luminescence, Optical, And Structural Properties Of Srmoo4:Ce3+ Phosphor For Photonics Material Applications, Eakgapon Kaewnuam, Nuanthip Wantana, Sasithorn Saikaew, Jakrapong Kaewkhao
Journal of Metals, Materials and Minerals
SrMoO4:Ce3+ phosphors with different Ce2O3 concentration were studied in the structure, optical and luminescence properties. The phosphor powders were synthesized by a solid-state reaction to investigate with the XRD, FTIR, absorption and emission spectra measurement. The XRD patterns confirm the tetragonal crystalline structure of SrMoO4 host composition. The FTIR spectra show the dominant vibrations of tetrahedral [MoO4]2- unit in powders. These phosphors absorb photons in the range of ultraviolet and visible light proved by the absorption spectra. The emission spectra represent the strongest emission at 421 nm wavelength of phosphors under 266 nm excitation. This emission occurred under the transition …
Defects Of The Steel Billet In Continuous Casting, Anh-Hoa Bui, Van-Hung Nguyen
Defects Of The Steel Billet In Continuous Casting, Anh-Hoa Bui, Van-Hung Nguyen
Journal of Metals, Materials and Minerals
In continuous casting process, defects of the steel billet (e.g. crack, pinhole, blowhole, central shrinkage, slag entrapment and appearance deviation, etc.) negatively affect the quality and the yield of rolled products. This research has been carried out to investigate some defects which often occurred in Vietnamese steel plants. The experimental work was conducted in an industrial 4-strands continuous casting machine with the billet's cross-section of 130×130 mm2 . The position, generating cause identification of these defects and proper measures have been discussed. A change in the steel compositions and the water distribution during secondary cooling was applied to improve the …
Sm3+ Ions Doped Zinc Barium Tellurite Oxyfluoride Glasses For Laser Materials, Yaowalak Yamsuk, Patarawagee Yasaka, Jakrapong Kaewkhao, Narong Sangwaranatee
Sm3+ Ions Doped Zinc Barium Tellurite Oxyfluoride Glasses For Laser Materials, Yaowalak Yamsuk, Patarawagee Yasaka, Jakrapong Kaewkhao, Narong Sangwaranatee
Journal of Metals, Materials and Minerals
The Sm3+ ions were doped tellurite glasses with composition (55-x) TeO2-10ZnF2- 35BaO-xSm2O3 (where x = 0.00, 0.05, 0.10, 0.50, 1.00 and 1.50 in mol%) to investigate the physical, the optical, the luminescence and structural properties. The functional groups can be identified using FT-IR spectra of Sm3+ in the glasses. The most intense peak from emission spectra is at 600 nm (4G5/26H7/2) corresponding to reddish-orange color. The oscillator strengths were resolved from the absorption spectra and then used to calculate the Judd - Ofelt (J - O) intensity parameters. The radiative properties were calculated by J - O intensity parameters for …
The Water Permeability Properties Of Re-Vibrated Lightweight Concrete, Muayad Mohammed Kassim
The Water Permeability Properties Of Re-Vibrated Lightweight Concrete, Muayad Mohammed Kassim
Journal of Metals, Materials and Minerals
Re-vibration of sequential layers of relatively deep structural members after a particular time harms the strength and water permeability properties of the concrete. The harmful effects can be observed in lightweight concrete due to the floating tendency of lightweight aggregate. In this experimental study, the influence of adding retarder plasticizer and silica fume on water permeability properties of re-vibrated lightweight concrete was investigated. The effects of re-vibration at different time lags on compressive strength and permeable voids ratio were studied. Absorption, sorptivity, and water penetration depth under pressure were also studied. Results show that the addition of a retarder increased …
Physical Property And Compressive Strength Of Fired Clay Bricks Incorporated With Paper Waste, Anuwat Srisuwan, Nonthaphong Phonphuak
Physical Property And Compressive Strength Of Fired Clay Bricks Incorporated With Paper Waste, Anuwat Srisuwan, Nonthaphong Phonphuak
Journal of Metals, Materials and Minerals
This research is intended to evaluate the effects of paper waste addition on the physical properties and strength of fired clay bricks. Paper waste was mixed with clay in the ratios of 2.5, 5.0, 7.5 and 10 wt%. Green bricks were fired with different variations of temperature from 900-1100C for1 h in air. Fired bricks were then analyzed for physical and mechanical properties. Porosity was increased with higher paper waste content. An increase in porosity relatedly created lower density and higher shrinkage values. Additionally, porous content in fired clay bricks correlated to the deterioration of the compressive strength, due to …
Structural Studies Of Natural Zeolites And Optimizations For Water Hardness Softening Media, Tesfamariam Teklu Gebretsadik, Teklit Kidane Gebremedhin
Structural Studies Of Natural Zeolites And Optimizations For Water Hardness Softening Media, Tesfamariam Teklu Gebretsadik, Teklit Kidane Gebremedhin
Journal of Metals, Materials and Minerals
This study was aimed at investigating the mineralogical composition and structural features of natural zeolites using XRF, XRD, TGA, FT-IR and SEM. Natural zeolites were subjected to acid-activation and subsequently with NaCl salt to enhance surface area for water hardness softening applications. Peaks around 3560 and 1650 cm-1 belongs to O - H stretching and O - H bending vibrations which confirmed the presence of moisture within zeolite structures. This result was further supported by evolution of moisture above 108°C from thermogravimetric analysis. Fibrous structures which are full of rough texture were examined by SEM. The XRD pattern confirmed Stellerite …
Development Of Sr/Cao Catalyst Derived From Cuttlebone (Sepia Officinalis) For Biodiesel Production, Napat Tomano, Apisit Prokaew, Supakorn Boonyuen, Sarute Ummartyotin
Development Of Sr/Cao Catalyst Derived From Cuttlebone (Sepia Officinalis) For Biodiesel Production, Napat Tomano, Apisit Prokaew, Supakorn Boonyuen, Sarute Ummartyotin
Journal of Metals, Materials and Minerals
Cuttlebone (Sepia officinalis) was used as a source of calcium oxide for biodiesel catalyst. The objective of this work is to present the bio-based catalyst prepared from cuttlebone. 1, 3, 5 and 10 %wt of strontium was loaded into calcium oxide powder derived from cuttlebone. Structural properties of Sr/CaO catalyst were evaluated by Fourier transform infrared and X-ray diffraction, respectively. There is no change on morphological properties of catalyst between Sr/CaO and pristine CaO. The homogeneous distribution of strontium was confirmed by EDX mapping technique. The specific surface area of powder was estimated to be 10-30 m2 ·g-1. The thermal …
Investigation Of Crosslink Structure Of Natural Rubber During Vulcanization Using X-Ray Absorption Near Edge Spectroscopy, Kanoktip Boonkerd, Wanwisa Limphirat
Investigation Of Crosslink Structure Of Natural Rubber During Vulcanization Using X-Ray Absorption Near Edge Spectroscopy, Kanoktip Boonkerd, Wanwisa Limphirat
Journal of Metals, Materials and Minerals
The X-ray absorption near edge spectroscopy technique (XANES) has been applied to determine the crosslinking structure of natural rubber (NR) during sulfur vulcanization process. The NR samples were prepared using DCBS as an accelerator at different sulfur to DCBS ratios (from 0.26 to 6.67). The results showed that with increasing cure time from tc50 to tc70, tc90 and tc100 the position of sulfur peak shifted to higher energy. This implied that the amount of polysulfidic crosslink gradually decreased with increasing cure time. This result supported the crosslinking mechanism proposed in the literature at which the polysulfidic crosslink is dominating at …