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

Engineering Commons™

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

Journal

Discipline
Institution
Keyword
Publication Year
Publication
File Type

Articles 21931 - 21960 of 27415

Full-Text Articles in Engineering

Influence Of Calcium Carbonate Nanoparticles On Mechanical Behavior Of Poly(Lactic Acid)/Poly(Butylene Succinate) Blend, N Hongsriphan, T Burirat, P Niratsungnern, S Trongteng Jul 2013

Influence Of Calcium Carbonate Nanoparticles On Mechanical Behavior Of Poly(Lactic Acid)/Poly(Butylene Succinate) Blend, N Hongsriphan, T Burirat, P Niratsungnern, S Trongteng

Journal of Metals, Materials and Minerals

PLA/PBS blends in various blend ratio (70:30, 50:50, and 30:70 wt%) containing calcium carbonate nanoparticles (nano-CaCO3) of 1 and 5 phr were prepared. Tensile tests with 3 strain rates and Izod impact test were carried out in order to investigate the influence of CaCO3 nanoparticles on mechanical behavior of nanocomposites under different deformation rates. Morphology and compatibility of nanocomposites were studied using SEM and DSC. It is found that PBS/PLA 50/50 wt% blends exhibited the highest percentage of elongation at break due to co-continuous phases as seen in SEM. CaCO3 nanoparticles were dispersed uniformly in polymer matrix although they showed …

Go to article

Chitosan Derivative-Based Hemostat: Irritation, Hypersensitivity And Absorbability Study, B Thavornyutikarn, W Kosorn, P Surattanawanich, U Wongparami, W Janvikul Jul 2013

Chitosan Derivative-Based Hemostat: Irritation, Hypersensitivity And Absorbability Study, B Thavornyutikarn, W Kosorn, P Surattanawanich, U Wongparami, W Janvikul

Journal of Metals, Materials and Minerals

The objective of this study was to evaluate the safety of a carboxymethylchitosan-based hemostatic prototype for internal use, in terms of irritation, hypersensitivity and absorbability. Skin irritation and delayed-type hypersensitivity tests of the prototype in humans (n=30) were assessed by a patch test method. The human skin sites were graded and photographed after patch removal at each time point using a 4-point (0-3+) grading scale of increasing irritation related to ISO 10993-10:2002(E) and a 6-point grading scale of increasing allergy related to International Contact Dermatitis Research Group (ICDRG). The results demonstrated that the chitosan derivative-based hemostat did not cause skin …

Go to article

Halogenated Sorbitol Derivatives Using As Nucleating Agent And Their Effect On Orientation Of Polypropylene Fiber, T Sutthatang, S Wangsoub Jul 2013

Halogenated Sorbitol Derivatives Using As Nucleating Agent And Their Effect On Orientation Of Polypropylene Fiber, T Sutthatang, S Wangsoub

Journal of Metals, Materials and Minerals

In this work, two halogenated derivatives of benzylidene sorbitol were synthesized by reacting D-sorbitol with an aromatic aldehyde in the present of an acid catalyst. ie.chloro and bromo derivatives for using as nucleating agent for polypropylene. For chloro derivative, different positions of substituent (ortho, meta and para) were also synthesised. SEM and TEM micrographs of gel extracted from organic solvent revealed long fibril network of chloro and bromo substitutes which their diameters are in the range of about 10-200 nm. Small amount (0.1-1%wt) of these materials was blended with isotactic polypropylene (iPP) by two roll mill machine and the mixture …

Go to article

Upconversion Luminescence Of Yttrium Oxysulfide Co-Doped With Rare Earth Elements, U Injarean, P Pichestapong, T Ruangsiritanyakul, S Tayaniphant Jul 2013

Upconversion Luminescence Of Yttrium Oxysulfide Co-Doped With Rare Earth Elements, U Injarean, P Pichestapong, T Ruangsiritanyakul, S Tayaniphant

Journal of Metals, Materials and Minerals

Rare earth ions doped upconversion phosphors have been used in many applications such as infrared laser detecting, anti-counterfeit protection and solid state display. In this study, yttrium oxysulfide (Y2O2S) compounds co-doped with rare earth elements, ytterbium (Yb), and one of the following elements, erbium (Er), thulium (Tm), europium (Eu) or holmium (Ho) were synthesized from doped rare earth oxides using sulfide fusion method with pelletization pretreatment. The doping was carried out with the mixing of yttrium nitrate and rare earth nitrate solutions to obtain homogeneous mixture. The mixed nitrate solution was precipitated with oxalic acid and calcined to doped oxide …

Go to article

Titanium Dioxide Nanostructures Synthesized By Sonochemical Hydrothermal Process, N Wongpisutpaisan, C Kahattha, N Vittayakorn, A Ruangphanit, W Pecharapa Jul 2013

Titanium Dioxide Nanostructures Synthesized By Sonochemical Hydrothermal Process, N Wongpisutpaisan, C Kahattha, N Vittayakorn, A Ruangphanit, W Pecharapa

Journal of Metals, Materials and Minerals

Titanium dioxide particles were prepared by sonochemicalhydrothermal process from a precursor of titanium isopropoxide in the presence of polyvinyl alcohol aqueous solution. Sonication of the precursor was conducted using sonic horn operated at 20 kHz until the completely precipitated product was reached. As-obtained intermediate products were then loaded into a Teflon-lined stainless steel autoclave for hydrothermal process with10M NaOH aqueous solution and heated under different temperature 80-120C. The synthesized products were characterized of structural properties and surface morphology by X-ray diffraction spectroscopy and field emission scanning electron microscope. The results show that prepared samples have a good crystallinity and the …

Go to article

Crystallization Behavior Of Pla In Pla/Nr Compared With Dynamic Vulcanized Pla/Nr, C Thongpin, S Klatsuwan, P Borkchaiyapoom, S Thongkamwong Jul 2013

Crystallization Behavior Of Pla In Pla/Nr Compared With Dynamic Vulcanized Pla/Nr, C Thongpin, S Klatsuwan, P Borkchaiyapoom, S Thongkamwong

Journal of Metals, Materials and Minerals

PLA has been an interesting biopolymer widely used in various applications. It has been widely known that crystallization of PLA is rather slow. After melt processing, crystallinity of PLA could be lost. The study of PLA added with fibers, particles or even nano-particles has been studied extensively. Nonetheless, the suffering in some mechanical characteristic such as toughness has been encountered. Our research was aimed to enhance toughness of PLA by melt blending NR, and dynamic vulcanized NR into PLA using an internal mixer. PLA:NR and PLA:NR vulcanizate with the ratio of 90:10, 80:20, 70:30, 60:40 and 50:50 were studied. Crystallization …

Go to article

Dissolved Oxygen Sensor Film Using Ruthenium Polypyridine Complex As Luminophore, C Su-Ngam, Sh Thang, A Wongchaisuwat, L Meesuk Jul 2013

Dissolved Oxygen Sensor Film Using Ruthenium Polypyridine Complex As Luminophore, C Su-Ngam, Sh Thang, A Wongchaisuwat, L Meesuk

Journal of Metals, Materials and Minerals

Ruthenium polypyridine complex was synthesized by using RAFT process. The Ruthenium was immobilized in 2 silicone matrices, polydimethylsiloxane(PDMS) and KE 200 (silicone elastomer base)/CX200 (curing agent). KE 200/CX200 is the alcohols curing type silicone. Both sensor films showed absorption peak at 460 nm and luminescence peak at 610 nm. The KE200/CX200 film gave linear response to dissolved oxygen up to 80% O2 (18 ppm) follow Stern-Volmer equation with R2 of 0.990. The measured luminescence intensity decreased with increasing dissolved oxygen water temperature from 25 to 70c. After being irradiated with 460 nm light source for 3 hrs, the sensor film …

Go to article

Low Temperature Chemical Precipitation And Characterization Of Ceria Based Ceramic Composite Oxide Materials, D Radhika, A Samson Nesaraj Jul 2013

Low Temperature Chemical Precipitation And Characterization Of Ceria Based Ceramic Composite Oxide Materials, D Radhika, A Samson Nesaraj

Journal of Metals, Materials and Minerals

Ceria based ceramic composite oxide materials such as Ce0.9Gd0.1O2-δ -Ce0.9Y0.1O2-δ and Ce0.8Gd0.2O2-δCe0.8Y0.2O2-δ were prepared by a simple chemical precipitation method for application in low temperature solid oxide fuel cells (LTSOFCs) as electrolytes. The precursor materials used in this synthesis were cerium nitrate hexahydrate, gadolinium nitrate and yttrium nitrate (as basic materials), sodium hydroxide (as precipitator material) and PVA (as surfactant). A mixture of metal hydroxides was formed when the aqueous mixture of basic materials mixed with the aqueous precipitant solution in proper stoichiometric composition. The resultant hydroxide mixture was washed with ethanol and water mixture (1:9 volume ratio) to remove …

Go to article

Macrostructure Modeling Of Al-20 % Sn Alloy, P Padhi, Ak Sahoo, S Kar Jul 2013

Macrostructure Modeling Of Al-20 % Sn Alloy, P Padhi, Ak Sahoo, S Kar

Journal of Metals, Materials and Minerals

In metallic alloys, the formation of macrostructure involves different length and time scales. The macrostructure strongly influences the mechanical properties of the materials. Modeling of macrostructure provides valuable insights for tailoring of the structure. In the present study simulation of macrostructure in Al-20Sn has been carried out. Expression for nucleation rate and growth rate were tuned to get a match with the experimentally observed macrostructure. The study incorporates the motion of grains due to Brownian motion. Incorporation of Brownian motion resulted in more uniform distribution locally, which has been experimentally observed. Both simulation and macrograph showed few columnar grains and …

Go to article

The Effect Of The Probiotic Pediococcus Acidilactici On The Gut Microbiota Ecology Of Rainbow Trout (Oncorhynchus Mykiss Walbaum) Analysed Using Dgge, Alice Anderson Jul 2013

The Effect Of The Probiotic Pediococcus Acidilactici On The Gut Microbiota Ecology Of Rainbow Trout (Oncorhynchus Mykiss Walbaum) Analysed Using Dgge, Alice Anderson

The Plymouth Student Scientist

The microbiota of the gastrointestinal tract heavily influences the health, growth and survival of fish. Probiotics have proved effective in improving fish productivity in aquaculture. Research suggests that probiotics, supplemented in the feed, may elicit these benefits by altering the ecology of the gastrointestinal microbiota. The probiotic Pediococcus acidilactici has been successfully used for terrestrial animals and humans but its use in aquatic organisms has been less researched. In the present study, rainbow trout Oncorhynchus mykiss (Walbaum) were fed a diet that contained Ped. Acidilactici, or a control diet. Analysis of the posterior digesta bacteria, using a non-culture dependant technique, …

Go to article

Osmotic Regulation Of The Amphipod Gammarus Chevreuxi (Sexton, 1912), Sam Houston Jul 2013

Osmotic Regulation Of The Amphipod Gammarus Chevreuxi (Sexton, 1912), Sam Houston

The Plymouth Student Scientist

This study investigated osmotic regulation in the amphipod, Gammarus chevreuxi, and is the first publication of this organism’s osmotic regulatory curves. Unlike most estuarine amphipods studied to date which are hyperosmotic regulators, G. chevreuxi is a hyper-hyposmotic regulator. The hyperosmotic gradient maintained by G. chevreuxi in dilute media is very low (~120mmol.L-1), which has been interpreted as evidence of freshwater ancestry among the Crustacea. Salinity acclimation did not appear to affect heart rate or pleopod beat frequency. The gill cells responsible for ion uptake appeared to be smaller in high salinities or distorted. The apical membrane in concentrated media shows …

Go to article

Bs News July/August Jul 2013

Bs News July/August

Building Services Engineering

No abstract provided.

Go to article

Parameters Optimization Of Copper Wire Bonding On Thin Small Outline Package, S Srikamonsirisak, U Tantinuchawong, Y Satirakul Jul 2013

Parameters Optimization Of Copper Wire Bonding On Thin Small Outline Package, S Srikamonsirisak, U Tantinuchawong, Y Satirakul

Journal of Metals, Materials and Minerals

With significant rising of Au price, there is growing demand to implement Cu wire bonding as an alternative method for Au wire bonding. However, there are several challenges to overcome because Cu is easily oxidized and its property is harder than Au. The oxidation deteriorates bondability and bond reliability, while the greater wire hardness leads to the more severe wire bonding parameters (higher force, higher power, higher temperature), which results in physical damage of the bond pad and underlying layers. This paper reveals wire bonding parameters optimization in order to implement Cu wire bonding in high volume production environment with …

Go to article

Application Of Para Rubber Latex Mixed With Organic Dyes As Printing Ink For Biodegradable Plastic Film, T Techochaingam, S Netpradit, K Tanprasert, P Boochathum Jul 2013

Application Of Para Rubber Latex Mixed With Organic Dyes As Printing Ink For Biodegradable Plastic Film, T Techochaingam, S Netpradit, K Tanprasert, P Boochathum

Journal of Metals, Materials and Minerals

content of 35.9% and 41.2%, which had the viscosity of 9.52 seconds and drying time of around 5 minutes. The viscosity of Para rubber latex with solid content of 59.0% and 61.4% was very high; thus, resulted in coagulation. Then modified rubber latex CNR with solid content of 16.5%, 19.2%, 26.8% and 28.2%, which had the viscosity around 8.30 seconds and drying time of around 5 minutes. Dye solution was prepared by adding 1 part of dye to 1 part of water (w/w). The formulation of ink that yielded the highest optical density of 1.43 was 8.4 g dye solution …

Go to article

Conversion Of Secondary Pulp And Paper Sludge To Glucose By Hydrothermal Treatment, N Chariyaprasertsin, Y Matsumura, T Charinpanitkul Jul 2013

Conversion Of Secondary Pulp And Paper Sludge To Glucose By Hydrothermal Treatment, N Chariyaprasertsin, Y Matsumura, T Charinpanitkul

Journal of Metals, Materials and Minerals

Secondary pulp/paper sludge is residue from water treatment process of the paper industry. Main components of secondary pulp/paper sludge are cellulose, hemicelluose, lignin and calcium carbonate (CaCO3). The cellulose and hemicellulose could be converted to glucose by hydrothermal treatment in a stainless steel tubular batch reactor. It was found that dried powder of secondary pulp/paper sludge with nominal size in a range of 595 to 840 m contains different content of CaCO3. Therefore, effect of CaCO3 content on glucose yields was examined under designated temperature of 200-260 C and treating time of 0-40 minutes. Identification and quantification of glucose and …

Go to article

Characterization Of Diamond-Like Carbon (Dlc) Films Deposited By Filtered Cathodic Vacuum Arc Technique, N Konkhunthot, C Euaruksakul, P Photongkam, P Wongpanya Jul 2013

Characterization Of Diamond-Like Carbon (Dlc) Films Deposited By Filtered Cathodic Vacuum Arc Technique, N Konkhunthot, C Euaruksakul, P Photongkam, P Wongpanya

Journal of Metals, Materials and Minerals

Diamond-like carbon (DLC) films were prepared on AISI H13 hot-work tool steel substrates by filtered cathodic vacuum arc (FCVA) technique under variable substrate DC biasing. The atomic structures of the films were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy, and near edge x-ray absorption fine structure spectroscopy. The Raman spectra revealed that when the magnitude of the bias voltage increased, the G peak was shifted toward lower wave numbers, and indicated that the sp3 content in the DLC films increased. The ratios between the sp3 and sp2 bonds in the films were verified by X-ray photoelectron spectroscopy, and the analyses …

Go to article

Factors Leading To Decentralization Of Ict Companies: The Case Of Multimedia Super Corridor, Malaysia, Muhammad Asim Tufail, Abu Hassan Abu Bakar, Wiwied Virgiyanti, Faisal Manzoor Arain Jul 2013

Factors Leading To Decentralization Of Ict Companies: The Case Of Multimedia Super Corridor, Malaysia, Muhammad Asim Tufail, Abu Hassan Abu Bakar, Wiwied Virgiyanti, Faisal Manzoor Arain

Business Review

Technological development in the information and communication technologies (ICT) sector is essential to attain sustainability in today’s era. Cities have developed satellite towns at the periphery with hi-fidelity digital and physical infrastructure which converts a single cantered city into a multi cantered one. In case of Kuala Lumpur Metropolitan Area (KLMA) the shift of civic services to Putrajaya and development of Multimedia Super Corridor (MSC) which offers incentives to local and foreign companies to develop a super block of research and development based economic sector. This development spearheaded the Malaysian Vision 2020 of knowledge based economy and society and has …

Go to article

Isolation And Characterisation Of Micro-Organisms With Industrial Importance From Sisal Bole Rots, Consolatha Mhaiki Jun 2013

Isolation And Characterisation Of Micro-Organisms With Industrial Importance From Sisal Bole Rots, Consolatha Mhaiki

Tanzania Journal of Engineering and Technology (TJET)

Investigation of microorganisms naturally acclimatized to Agave hybrid H 11648 (sisal bole rot) was conducted, with the aim of isolating and characterizing Aspergillus niger strains for industrial use. Microorganism were identified morphologically and then confirmation made by polymerase chain reaction (PCR). Results showed the existence of four major groups, listed in order of abundances as follows; Aspergilli (36.0±0.8) %, Penicillin (28.0±0.1) %, Yeast (15.0±1.6) %and Fusarium (10.0±0.12) %. The main groups of Aspergilli strains were A. nidulans, A. tamari and A. niger in ratios (3:2:2), respectively. Several endo-spore forming non-enteric gram (-) rods and coccid bacteria identified by API 20 …

Go to article

Improvement Of Hydraulic Press For Vegetable Oil Expression In Rural Areas, I. P. Bateebe Jun 2013

Improvement Of Hydraulic Press For Vegetable Oil Expression In Rural Areas, I. P. Bateebe

Tanzania Journal of Engineering and Technology (TJET)

Cultivation of oil producing crops especially Jatropha and croton as source of vegetable oil for biodiesel production is being encouraged in rural areas. To recover oil from seed, manual press is the feasible method in rural areas where there is no electricity. Research was conducted to improve hydraulic oil press machine for rural application. Factors affecting oil recovery were found to be: moisture content of seeds, operating pressure, seed oil content, and the amount of seeds pressed per batch. Percentage oil recovery was improved by reducing diameter of press cylinder, hence increasing expression pressure, and either reducing amount of seed …

Go to article

Problems And Prospects Of Hydraulic Modelling For Environmental Flows Assessment Studies In East Africa, Preksedis Ndomba Jun 2013

Problems And Prospects Of Hydraulic Modelling For Environmental Flows Assessment Studies In East Africa, Preksedis Ndomba

Tanzania Journal of Engineering and Technology (TJET)

The objective of this paper is to document the problems and prospects of hydraulic modelling for Environmental Flows Assessment (EFA) studies based on selected case studies. Most of studies in East Africa use Holistic methodologies. An ideal data set for defining river hydraulics for most of these methods would be six data points of stage measurements over a good distribution of discharges, the stage of zero discharge and some flood-related data. Besides, in East African region EFA studies suffer from data scarcity (i.e., poorly gauged sites) and limited expertise and funding. The hydraulics studies conducted by the authors entailed desktop …

Go to article

Open Source Kiswahili Spell Checker (Sw-Tz), Hashim Twaakyondo Jun 2013

Open Source Kiswahili Spell Checker (Sw-Tz), Hashim Twaakyondo

Tanzania Journal of Engineering and Technology (TJET)

Different English software products are localized into many native languages spoken around the world, the most popular software products localized so far are word processing software and web browsers. The effort has begun to localize these software products in Kiswahili language which is widely spoken in Tanzania, East and Central Africa. Kiswahili is an official language of Tanzania, and is a national language in Uganda and Kenya. To make these software products useful to Kiswahili speaking community particularly in Tanzania a new Kiswahili spell checker has been developed and, it uses most of the Kiswahili words spoken in Tanzania and …

Go to article

2d Autocad Geometric Data Extraction And Post Processing For Numerical Control, Tito Mwinuka Jun 2013

2d Autocad Geometric Data Extraction And Post Processing For Numerical Control, Tito Mwinuka

Tanzania Journal of Engineering and Technology (TJET)

In this paper, a method of extracting 2D geometric data from AutoCAD drawing and post processing for Numerical Control (NC) is presented. Geometric data already available in the Drawing Interchange Files (DXF) can be utilized to accurately and economically prepare part programs for controlling NC/CNC machine tools. AutoCAD, being general purpose software, stores its geometric data in a form that cannot be directly applied for automatic generation of Numerical Control (NC) codes. The way around the discrepancy between the structure of a drawing database (DXF files) and the information requirement for part programming is addressed in this work. NC programming …

Go to article

Gas Leakage Detection System (Glds), Daudi Simbeye Jun 2013

Gas Leakage Detection System (Glds), Daudi Simbeye

Tanzania Journal of Engineering and Technology (TJET)

This paper mainly focuses on the detection of gas leakage and providing security when the user is around or away from home. The system is Short Message Service (SMS) based and uses wireless technology for providing security against gas leakage to users hence cost effective and more adaptable. The system comprises of sensors for detecting gas leak interfaced to microcontroller that will give an alert to user whenever there is a gas leakage, display warning information by using Liquid Crystal Display (LCD), sending SMS to the user for notification wherever he/she might be and turning off electric power with the …

Go to article

Effect Of Ethyl Propionate On Low-Temperature Performance Of Lifepo4-Based Li-Ion Battery, Xiao-Ping Li, Lian-Sheng Hao, Wei-Shan Li, Meng-Qing Xu, Li-Dan Xing Jun 2013

Effect Of Ethyl Propionate On Low-Temperature Performance Of Lifepo4-Based Li-Ion Battery, Xiao-Ping Li, Lian-Sheng Hao, Wei-Shan Li, Meng-Qing Xu, Li-Dan Xing

Journal of Electrochemistry

A linear carboxylic, ester ethyl propionate (EP), was used as the co-solvent of carbonates, ethylene carbonate (EC), ethyl-methyl carbonate (EMC) and dimethyl carbonate (DMC), and its effect on low-temperature performance of LiFePO4-based Li-ion battery was studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge test. The application of EP enhances the ionic conductivity of the electrolyte, improves the compatibility of the electrolyte with both LiFePO4 and graphite materials, and thus improves the low-temperature performance of LiFePO4-based Li-ion battery. The Li-ion battery using the optimized electrolyte of 1 mol·L-1 LiPF6/EC:EMC:DMC:EP …

Go to article

Multifunctional Corrosion Inhibition Behavior Of Zn-Al Calcined Layered Double Hydroxides For Steel Rebar In Nacl Solution, Xiao-Juan Zhang, Jing-Jing Wang, Shi-Gang Dong, Chang-Jian Lin Jun 2013

Multifunctional Corrosion Inhibition Behavior Of Zn-Al Calcined Layered Double Hydroxides For Steel Rebar In Nacl Solution, Xiao-Juan Zhang, Jing-Jing Wang, Shi-Gang Dong, Chang-Jian Lin

Journal of Electrochemistry

The Zn-Al layered double hydroxides (Zn-Al LDHs) and calcined products (Zn-Al CLDHs) were synthesized successfully under a routine air atmosphere. The results showed that both Zn-Al LDHs and Zn-Al CLDHs had obvious flake structures. The corrosion inhibition of Zn-Al CLDHs for steel rebar in NaCl solution was studied by electrochemical techniques. It was found that the corrosion rate of steel rebar decreased significantly after the steel rebar was treated by Zn-Al CLDHs in NaCl solution for 3 h. It was indicated that Zn-Al CLDHs could absorb Cl- and release OH- during their reconstruction process, which provided dual protection …

Go to article

Influences Of The Cinnamic Acid On Zinc Electrodeposition At Glassy-Carbon Electrode, Kai Li, Shen Chen, Shen-Na Liu, Bi-Sang Chen, Heng Lin, Guo-Liang Chen, Qing-Xiang Wang Jun 2013

Influences Of The Cinnamic Acid On Zinc Electrodeposition At Glassy-Carbon Electrode, Kai Li, Shen Chen, Shen-Na Liu, Bi-Sang Chen, Heng Lin, Guo-Liang Chen, Qing-Xiang Wang

Journal of Electrochemistry

The influences of cinnamic acid (CIN) on the mechanism of Zn deposition and nucleation kinetics onto glassy-carbon electrode were studied by cyclic voltammetry (CV) and chronoamperometry (CA). The results revealed that the zinc reduction took place via Zn2+ + 2e → Zn in the presence of CIN, but the kinetics of zinc deposition was changed and the formation rate of zinc nuclei was accelerated. In the absence of CIN, the mechanism of zinc nucleation followed the 3D-instantaneous diffusion-controlled nucleation, while the 3D-progressive diffusion-controlled nucleation in the presence of CIN. The addition of CIN reduced the nucleation rate, but increased …

Go to article

Preparation And Characterization Of A Novel Composite Electrolyte Ceria-Sulfate For Intermediate Temperature Solid Oxide Fuel Cells, Ze Tong, Yi-Mei Yin, Jie-Wei Yin, Zi-Feng Ma Jun 2013

Preparation And Characterization Of A Novel Composite Electrolyte Ceria-Sulfate For Intermediate Temperature Solid Oxide Fuel Cells, Ze Tong, Yi-Mei Yin, Jie-Wei Yin, Zi-Feng Ma

Journal of Electrochemistry

A novel composite electrolyte SDC-(Li/Na)2SO4 was prepared for intermediate temperature solid oxide fuel cells (ITSOFC). The phase structure and cross-sectional morphology were examined by XRD and SEM, respectively, and the ionic conductivity was investigated by AC impedance in a temperature range of 400 oC ~ 700 oC in air. It was found that the composite electrolyte was composed of two phases: crystal SDC and amorphous (Li/Na)2SO4. The conductivity of the composite electrolyte was significantly larger than that of SDC at intermediate temperatures (550 oC ~ 700 oC) and increased …

Go to article

The Effect Of Precursors On Performance Of Lini0.5Co0.2Mn0.3O2 Cathode Material, Dong-Ge Hu, Zhang-Zhi Wang, Jia-Li Liu, Tao Huang, Ai-Shui Yu Jun 2013

The Effect Of Precursors On Performance Of Lini0.5Co0.2Mn0.3O2 Cathode Material, Dong-Ge Hu, Zhang-Zhi Wang, Jia-Li Liu, Tao Huang, Ai-Shui Yu

Journal of Electrochemistry

Commercial LiNi0.5Co0.2Mn0.3O2 material is generally prepared by a combination of co-precipitation and solid state reaction method. The particle size distribution and morphology of Ni0.5Co0.2Mn0.3(OH)2 precursor have a great impact on the electrochemical performance of LiNi0.5Co0.2Mn0.3O2. In this work, the crystal structure and surface morphology of LiNi0.5Co0.2Mn0.3O2 prepared by three different precursors were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Particle size distribution, tap density and electrochemical performance were …

Go to article

Influence Of Electrode Hydrophobicity On Performance Of Alkaline Polymer Electrolyte Fuel Cells, Li-Sheng Tan, Jing Pan, Yao Li, Lin Zhuang, Jun-Tao Lu Jun 2013

Influence Of Electrode Hydrophobicity On Performance Of Alkaline Polymer Electrolyte Fuel Cells, Li-Sheng Tan, Jing Pan, Yao Li, Lin Zhuang, Jun-Tao Lu

Journal of Electrochemistry

In the present work, we study the influence of the electrode hydrophobicity on the performance of alkaline polymer electrolyte fuel cells (APEFCs). QAPS or xQAPS is employed as the membrane and the ionomer, while PTFE is used as a hydrophobic additive in order to adjust the electrode hydrophobicity. We find that enhancing the hydrophobicity of anode can promote the performance of APEFCs, while a moderate hydrophobicity of cathode is required to achieve optimal performance. By using xQAPS as the electrolyte and adding some PTFE in the anode, a peak power density of 132 mW·cm-2 can be obtained at a …

Go to article

Electrocatalytic Mechanism And Porous Electrode Mass Transfer Process In Membrane Electrode Assembly For Direct Methanol Fuel Cells, Xin-Dong Wang, Yi-Tuo Wang, Gui-Cheng Liu, Meng Wang, Zhe Tian Jun 2013

Electrocatalytic Mechanism And Porous Electrode Mass Transfer Process In Membrane Electrode Assembly For Direct Methanol Fuel Cells, Xin-Dong Wang, Yi-Tuo Wang, Gui-Cheng Liu, Meng Wang, Zhe Tian

Journal of Electrochemistry

Direct methanol fuel cell (DMFC) is considered to be a promising commercial energy conversion device for portable electronics due to its many advantages. In order to improve the performance of DMFC, many companies and research institutes have been launching the deep research and obtaining a lot of conspicuous achievements. In this paper, the electrocatalytic mechanism and porous electrode mass transfer process in membrane electrode assembly (MEA) are analyzed. In addition, combined with the preparation process of MEA, multilayer ordered structures and internal transfer process of the cell, recent progresses of MEA in DMFC are discussed.

Go to article

First Prev Next Last