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

2017

Chulalongkorn University

Journal of Metals, Materials and Minerals

Articles 1 - 16 of 16

Full-Text Articles in Engineering

Antibacterial Activity Of Zno Nanoparticles On Silica Thin Film For Wastewater Treatment, S Chanrawangyot, S Rattanachan, A Watcharenwong, T Fangsuwannarak Dec 2017

Antibacterial Activity Of Zno Nanoparticles On Silica Thin Film For Wastewater Treatment, S Chanrawangyot, S Rattanachan, A Watcharenwong, T Fangsuwannarak

Journal of Metals, Materials and Minerals

Zinc Oxide nanoparticles on silica matrix thin films were prepared by the Sol-gel method and dip coating on ceramic tiles. In this study, EC (Ethyl cellulose) and TP (alpha-terpineol) used as a binder and a solvent in Sol-gel method, respectively, were studied on the characteristics of thin films. The thin films were dried and calcined at the temperature of 500, 600˚C soaking 30 minutes with the heating rate of 1˚C/minutes. The result of Glancing X-Ray Diffraction showed that thin films were ZnO phase on the amorphous phase of silica matrix. Scanning electron microscope showed the ZnO nanoparticles dispersed on thin …

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Development Of Wo3 Nanostructure By Acid Treatment And Annealing, T Sanasi, S Pinitsoontorn, M Horprathum, P Eiamchai, C Chananonnawathorn, W Hincheeranun Dec 2017

Development Of Wo3 Nanostructure By Acid Treatment And Annealing, T Sanasi, S Pinitsoontorn, M Horprathum, P Eiamchai, C Chananonnawathorn, W Hincheeranun

Journal of Metals, Materials and Minerals

Tungsten oxide (WO3) nanostructure is an interesting material for many applications such as batteries, gas sensors, photocatalysts, display utilizing, and smart windows. In this work, we fabricated the WO3 nanoplates by sputtering, acid treatment and annealing. Firstly, a tungsten film was deposited on a silicon or glass substrate by sputtering. The film was then immersed in nitric acid (HNO3) at 80 °C. The effect of the exposure time, and annealing temperature was investigated. After the acid treatment, the tungsten oxide hydrate or tungstile (WO3•H2O) with nanoplate structure was developed. The optical transmittance in the visible range was significantly improved compared …

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Utilization Of Aluminium Dross As A Main Raw Material For Synthesis Of Geopolymer, P Puksisuwan, P Laoratanakul, B Cherdhirunkorn Dec 2017

Utilization Of Aluminium Dross As A Main Raw Material For Synthesis Of Geopolymer, P Puksisuwan, P Laoratanakul, B Cherdhirunkorn

Journal of Metals, Materials and Minerals

Aluminium dross contains both small particles and large agglomerates, where the recyclable part is the large agglomerates with high aluminium metal content. The residual Al dross is unrecyclable small particles with very low aluminium metal content. In this research, the residual Al dross from the aluminium recycle industry and the bagasse ash from a biomass power plant were used as main raw materials for geopolymer fabrication with alkaline solutions (Na2SiO3 and NaOH) using in the typical geopolymerization process. After mixing with alkaline solutions, the mixtures were uniaxially pressed into a cylinder die. The samples were cured for 3, 7, 14 …

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Physical And Optical Properties Of 20cao-(80-X)B2o3-Xzno Glass System, N Jearnkulprasert, O Chaemlek, N Wantana, J Kaewkhao Dec 2017

Physical And Optical Properties Of 20cao-(80-X)B2o3-Xzno Glass System, N Jearnkulprasert, O Chaemlek, N Wantana, J Kaewkhao

Journal of Metals, Materials and Minerals

The 20CaO-(80-x)B2O3-xZnO glasses were prepared by melt quenching technique (where x=0, 5, 15 and 20 mol%) in order to study in the physical and optical properties. These glass compositions were heated to 1200 ºC for 3 hours and annealed at 500ºC for 3 hours. Clear glass samples were obtained from these compositions. The density, molar volume, refractive index, optical spectra (in the wavelength of 190-1100 nm), optical band gap, optical basicity and polarizability of glass samples have been investigated in this work.

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Properties Of Natural Rubber Latex Filled With Bacterial Cellulose Produced From Pineapple Peels, T Saowapark, E Chaichana, A Jaturapiree Dec 2017

Properties Of Natural Rubber Latex Filled With Bacterial Cellulose Produced From Pineapple Peels, T Saowapark, E Chaichana, A Jaturapiree

Journal of Metals, Materials and Minerals

Bacterial cellulose (BC) is natural biopolymers with unique properties such as high purity and high tensile strength. These properties considerably support for use as filler in rubber applications. In this research, BC was produced from fermentation by Acetobacter xylinum. Additionally, pineapple peels (agricultural waste) were evaluated for carbon sources in BC's production process. Natural rubber latex (NRL) compound was then incorporated BC with various loadings of 0, 5, 10 and 15 phr (parts per hundred of rubber) for enhancement properties of NRL. Furthermore, NRL filled with BC (NRL-BC) compounds were prevulcanized at 70°C for 2 hours and then NRL-BC sheets …

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Kinetic Study Of Chitosan-Alginate Biopolymeric Nanoparticles For The Controlled Release Of Curcumin Diethyl Disuccinate, S Bhunchu, P Rojsitthisak, P Rojsitthisak Dec 2017

Kinetic Study Of Chitosan-Alginate Biopolymeric Nanoparticles For The Controlled Release Of Curcumin Diethyl Disuccinate, S Bhunchu, P Rojsitthisak, P Rojsitthisak

Journal of Metals, Materials and Minerals

The aim of this study was to investigate the release profile, and evaluate the best fitted kinetic model and mechanism, of curcumin diethyl disuccinate (CDD) from chitosan-alginate biopolymeric nanoparticles (CANPs) in simulated gastrointestinal fluids (without enzymes) and simulated body fluid. The CDD-loaded CANPs (CDD-CANPs) were prepared by oil-in-water emulsification and ionotropic gelation under the previously reported optimal condition (3 mg/mL of CDD, 4.05% (w/v) of TweenTM 80 and a chitosan:alginate mass ratio of 0.05:1), which resulted in CDD-CANPs with a favorable particle size (327±14 nm), zeta potential (-27.3±0.2 mV), encapsulation efficiency (51.2±2.2%) and loading capacity (11.2±0.8%). The in vitro release …

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Investigation Of The Durability Of Sisal Fiber/Pla Biocomposite Through Evaluation Of Biodegradability By Means Of Microbial Growth, T Kittikorn, S Kongsuwan, R Malakul Dec 2017

Investigation Of The Durability Of Sisal Fiber/Pla Biocomposite Through Evaluation Of Biodegradability By Means Of Microbial Growth, T Kittikorn, S Kongsuwan, R Malakul

Journal of Metals, Materials and Minerals

The aim of this work was to investigate the microbial biodegradation of 3-(trimethoxysilyl) propyl methacrylate (TPM) modified (silanized) sisal fibres/PLA biocomposites by Aspergillus niger. The modification of the sisal fibres performed excellently, improving hydrophobicity as well as mechanical properties. Compared to the unmodified sisal/PLA biocomposite, it produced superior interfacial adhesion between the fibres and the PLA matrix. In addition, silanization also increased the crystal size and crystallinity in the biocomposite, which decreased thermal decomposition to an observed maximal activation energy of 213 kJ/mol. This indicated the stability of silanized sisal biocomposite in resisting degradation. After the microbial growth test, despite …

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Effect Of Glass Fiber Length And Content On Mechanical Properties Of Polybutylene Terephthalate, P Threepopnatkul, N Sukprasurt, W Prom-Oh, C Kulsetthanchalee Jul 2017

Effect Of Glass Fiber Length And Content On Mechanical Properties Of Polybutylene Terephthalate, P Threepopnatkul, N Sukprasurt, W Prom-Oh, C Kulsetthanchalee

Journal of Metals, Materials and Minerals

The effect of glass fiber (GF) length and content were studied on mechanical properties of polybutylene terephthalate (PBT). The glass fiber was found to be highly compatible with PBT. The PBT/6 mm GF 30% composite possessed the highest flexural modulus (FM) and flexural strength (FS). The FM and FS were increased with the increasing of GF content. The longer glass fiber resulted in the higher value of FM and FS but hardly affected on the deflection and unnotched izod impact strength of the composites. The impact strength of composites was drastically decreased with the addition of glass fiber as compared …

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Eu3+ Doped Borosilicate Glass For Solid-State Luminescence Material, S Rakpanich, N Wantana, Y Ruangthaweep, J Kaewkhao Jul 2017

Eu3+ Doped Borosilicate Glass For Solid-State Luminescence Material, S Rakpanich, N Wantana, Y Ruangthaweep, J Kaewkhao

Journal of Metals, Materials and Minerals

The Eu3+ doped potassium borosilicate (KBSi:Eu3+) glasses were prepared by the melt quenching technique. The physical, optical and luminescence properties of glasses were investigated. Glass density and molar volume increase with increasing of Eu2O3 concentration. Glasses absorbed photons in the visible light and near infrared region. Since 394 nm excitation, glasses emitted the strong light with 613 nm in milliseconds of lifetime. CIE 1931 chromaticity diagram exhibits that emission from KBSi:Eu3+ glass is reddish-orange light. In summary, this KBSiEu glass performs the interesting property for using in the photonic devices such as solid-state laser and LEDs.

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Metallographic Analysis And Electrical Resistivity Of The 1045 Steel After Being Heat-Treated, M Quiroga Agurto, E Medrano Atencio, F Américo Reyes Navarro, J G Miranda Ramos Jul 2017

Metallographic Analysis And Electrical Resistivity Of The 1045 Steel After Being Heat-Treated, M Quiroga Agurto, E Medrano Atencio, F Américo Reyes Navarro, J G Miranda Ramos

Journal of Metals, Materials and Minerals

Herein, it was studied the structural evolution of the AISI 1045 steel water-quenched and oilquenched, respectively, from a temperature higher than the critical to various temperatures between 800 and 820°C. The two quenching media were used at 16.5°C. Microstructural variations occurred in the quenched 1045 steel. Also, by using the four-terminal sensing, it was measured the evolution of the electrical resistivity of the quenched samples; it was found that quenching at different temperatures provoked a complex behavior. It was noticed a major increase in the electrical resistivity in the case of water-quenched samples. Besides, when compared samples before and after …

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Effect Of Sputtering Power On The Structure Of Dc Magnetron Sputtered Vanadium Nitride Thin Films, A Buranawong, N Witit-Anun Jul 2017

Effect Of Sputtering Power On The Structure Of Dc Magnetron Sputtered Vanadium Nitride Thin Films, A Buranawong, N Witit-Anun

Journal of Metals, Materials and Minerals

Vanadium nitride (VN) thin films were deposited on Si substrates by reactive DC unbalanced magnetron sputtering. Effect of sputtering power on the structure of the as-deposited films was investigated. The crystal structure, thickness, roughness, surface morphology and chemical composition of the films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The results showed that the as-deposited VN thin films had fcc structure with (111), (200) and (220) planes, varying with the sputtering power. The crystallite size and lattice constant of films were in the range …

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Investigating Rheological, Morphological And Mechanical Properties Of Pbs/Pbat Blends, A Boonprasertpoh, D Pentrakoon, J Junkasem Jul 2017

Investigating Rheological, Morphological And Mechanical Properties Of Pbs/Pbat Blends, A Boonprasertpoh, D Pentrakoon, J Junkasem

Journal of Metals, Materials and Minerals

Morphological, rheological and mechanical properties of various biodegradable poly(butylene succinate) (PBS)/poly(butylene adipate-co-terephthalate) (PBAT) blends via conventional melt blending technique are studied. The morphology, rheology, and tensile properties of the PBS/PBAT blends were observed by scanning electron microscope (SEM), rotational rheometer, and universal testing machine, respectively. The SEM micrographs of the PBS/PBAT blends reveal an occurrence of phase separation indicating by a presence of spherical particles/cavities for a range of 10 to 30 wt% (i.e. PBS90-PBS70), and 70 to 90 wt% (i.e. PBS30-PBS10) PBT content and co-continuous structure for a range of 40 to 60 wt% (i.e. PBS60PBS40) PBAT content. The …

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Mechanical And Thermal Properties Of Eucalyptus Fiber Composites From Blend Between Biodegradable Poly(Butylene Succinate) And Recycled Pet, N Hongsriphan, P Dangmanee, M Mankrut, W Jantaraka Jul 2017

Mechanical And Thermal Properties Of Eucalyptus Fiber Composites From Blend Between Biodegradable Poly(Butylene Succinate) And Recycled Pet, N Hongsriphan, P Dangmanee, M Mankrut, W Jantaraka

Journal of Metals, Materials and Minerals

The goal of this study was to enhance rigidity and to reduce cost of the PBS-based composites by blending with recycled poly(ethylene terephthalate) (r-PET) and Eucalyptus fibers. Prior compounding, Eucalyptus fibers were treated with alkali and γ-methacryloxypropyl trimethoxysilane (MPS) solution for compatibility improvement. PBS and r-PET were melt blended in a twin-screw extruder with the weight ratio of 95/5, 90/10, and 80/20 wt%, and compounded with MPS treated Eucalyptus fibers using fiber loading of 3, 5, and 7 wt% of composites. Samples were characterized by tensile test, notched Izod impact test, SEM, NMR, and DSC. It was found that r-PET …

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Antireflective Surface Of Nanostructures Fabricated By Cf4 Plasma Etching, W Somrang, S Denchitcharoen, P Eiamchai, M Horprathum, C Chananonnawathorn Jul 2017

Antireflective Surface Of Nanostructures Fabricated By Cf4 Plasma Etching, W Somrang, S Denchitcharoen, P Eiamchai, M Horprathum, C Chananonnawathorn

Journal of Metals, Materials and Minerals

In this research, the nanostructures surface were fabricated by the CF4 plasma etching process on the SiO2-based substrates for antireflection applications. The nickel films were firstly deposited on the substrates by the sputtering system. The prepared Ni layers were then annealed at 500°C for 1 minute in order to promote dewetting process to be used as metal masks. During the etching process, CF4 etching condition was performed for 15-60 min to create the SiO2 nanopillars. After the etching process, the samples were immersed in nitric acid for 5 min to remove the nickel masks. The SiO2 nanopillars without Ni were …

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Strengthening Of The Astm-356 Alloy With Silicon Carbide Particles, Jaime Hinojosa-Torres, Diego Sánchez-García, Andrés Herrera-Vázquez, Jose Luis Velázquez-Ortega Jul 2017

Strengthening Of The Astm-356 Alloy With Silicon Carbide Particles, Jaime Hinojosa-Torres, Diego Sánchez-García, Andrés Herrera-Vázquez, Jose Luis Velázquez-Ortega

Journal of Metals, Materials and Minerals

Extensive research has been done in recent years in composites of metallic matrix in order to get better melting practices, mechanical properties and structure. In this work, steel metal mould was previously preheated to three different temperatures. The ASTM-356 alloy was melted and heated to 993 K. For the purpose of reinforcing, silicon carbide particles (mesh: 325, 400) were introduced into the melted alloy then stirred. For each obtained solid its solidification time was recorded. Cylindrical specimens were tested in a tension test machine in order to obtain the ultimate tensile strength (UTS) and fracture toughness (KIc) values. Hardness measurements …

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Study On Physical, Optical And Luminescence Of Er3+ In K2o-Cao-B2o3 Glasses For Photonic Application, N Wantana, S Insiripong, Y Ruangthaweep, J Kaewkhao Jul 2017

Study On Physical, Optical And Luminescence Of Er3+ In K2o-Cao-B2o3 Glasses For Photonic Application, N Wantana, S Insiripong, Y Ruangthaweep, J Kaewkhao

Journal of Metals, Materials and Minerals

In this work, potassium calcium borate glasses doped with of Er3+ ions (KCaBEr) have been prepared by a melt quenching technique. The glass physical, optical and luminescence properties have been investigated as a function of Er2O3 concentration. Density was measured by Archimedes' principle and brought to calculate the molar volume. The optical absorption spectra were measured in the ultraviolet, visible light and near-infrared regions. The emission and excitation spectra represents the strong emission from glass sample. All results indicate the potential to use KCaBEr glass in the photonic applications such as laser and optical amplification.

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