American Journal of Materials Science最新文献_第2页

Effect of Corn Cob Particulate on the Mechanical and Biodegradability Properties of Reinforced Polyester Composites 玉米芯颗粒对增强聚酯复合材料力学性能和生物降解性能的影响

American Journal of Materials Science Pub Date : 2015-01-01 DOI: 10.7726/AJMST.2015.1010

Oladele O. Isiaka, A. G. Okikiola, Ogungbe Funto, Babarinde Opeyemi

引用次数: 1

Analysis of Dielectric and Resistive Properties of Sn Substitution in Ni-Zn Ferrites Nanoparticles Ni-Zn铁氧体纳米粒子中Sn取代的介电和电阻性能分析

American Journal of Materials Science Pub Date : 2015-01-01 DOI: 10.7726/AJMST.2015.1009

A. Mahmud

{"title":"Analysis of Dielectric and Resistive Properties of Sn Substitution in Ni-Zn Ferrites Nanoparticles","authors":"A. Mahmud","doi":"10.7726/AJMST.2015.1009","DOIUrl":"https://doi.org/10.7726/AJMST.2015.1009","url":null,"abstract":"Ni-Zn Ferrites samples were prepared by solid state reaction method by introducing Sn. Polycrystalline samples were molded following this combination Ni0.6-x/2Zn0.4-x/2SnxFe2O4 (0 ≤ x ≤0.2) and sintered at temperature 1325C for 180 minutes. The structural, magnetic and transport properties of various ferrite samples were studied with the Sn substitution. XRD patterns indicate that the synthesized ferrite compositions were of single phase cubic spinel without any trace of impurity. Lattice parameter of the samples was found to decrease with increasing Sn concentration in the system obeying Vegard’s law. Dielectric constant decreased with the increase of frequency which is rapid at lower and slower at higher frequencies. This is a normal dielectric behavior in most of the ferromagnetic materials, which follow Maxwell and Wagner prediction. With the increase of temperature, dielectric constant and dielectric loss tangent are observed to be increased. The AC electrical resistivity, measured as a function of temperature, decreases with the increase of temperature indicating the semiconducting nature of all the samples. The activation energy of the all samples were calculated from the plot of ln(/0) vs.1/T curve. The lower activation energies are associated with higher electrical conductivity.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75267995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Review of Journal Bearing Materials and Current Trends 滑动轴承材料和当前趋势的回顾

American Journal of Materials Science Pub Date : 2015-01-01 DOI: 10.7726/AJMST.2015.1006

M. Babu, A. Krishna, K. Suman

引用次数: 30

Optimization of Metal Removal Rate in Turning for AISI 1040 Steel using Taguchi and Fuzzy Logic 应用田口和模糊逻辑优化AISI 1040钢车削金属去除率

American Journal of Materials Science Pub Date : 2015-01-01 DOI: 10.7726/AJMST.2015.1008

S. Hossain, R. Hassan, Md. Sajibul Alam Bhuyan

引用次数: 0

Study of the Variation of Chromium Oxide and Iron in Oxide Layer by XPS in DSS 2205 with Higher and Lower Chromium Content Due to Ageing for 7000 Hours at 300°C 用XPS研究高、低铬DSS 2205在300℃下时效7000小时氧化层中氧化铬和铁的变化

American Journal of Materials Science Pub Date : 2014-10-01 DOI: 10.5923/J.MATERIALS.20140405.01

J. Moreno, C. E. S. Junior

{"title":"Study of the Variation of Chromium Oxide and Iron in Oxide Layer by XPS in DSS 2205 with Higher and Lower Chromium Content Due to Ageing for 7000 Hours at 300°C","authors":"J. Moreno, C. E. S. Junior","doi":"10.5923/J.MATERIALS.20140405.01","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20140405.01","url":null,"abstract":"The surface oxidation of DSS 2205 duplex stainless steel was studied by X-ray photoelectron spectroscopy (XPS), for two different techniques witch were used to produce thin oxide layers on polished for measuring the concentration of oxide depends on the sputtering profile these duplex stainless steel samples. The experiments were performed in the temperature of 300°C with aging at 7000 hours e with growth of films obtained voltammetric curves (potentiostatically) of the samples in sulfuric acid (H2SO4-0.1M saturated) at low potential. The compositions of the modified oxidized surfaces were determined from the XPS survey scans, and the chemistry of selected elements from the higher-energy-resolution scans of the appropriate peaks. Various Iron/Chromium oxidized layers and various oxide thicknesses were observed and correlated with the temperature. It was found that all the techniques produced oxide layers with various traces of metallic components and with the maximum concentration of chromium oxide and iron oxide in layers close to the oxide layer/metal interface. Therefore this study showed results about the behavior of the DSS 2205 with higher and lower Cr content and that the annealing at 300°C for longer times (7000h) promotes the enrichment of iron oxide, and consequently the decrease in the chromium oxide content, in the oxide surface of both the DSS 2205.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77125333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Synthesis of Microwires of Polypyrrole via Chemical Polymerization using Track Etch Membrane as Template 以蚀刻膜为模板化学聚合法制备聚吡咯微丝

American Journal of Materials Science Pub Date : 2014-01-01 DOI: 10.7726/AJMST.2014.1001

R. Garg, D. Kumar, S. Chakarvarti

{"title":"Synthesis of Microwires of Polypyrrole via Chemical Polymerization using Track Etch Membrane as Template","authors":"R. Garg, D. Kumar, S. Chakarvarti","doi":"10.7726/AJMST.2014.1001","DOIUrl":"https://doi.org/10.7726/AJMST.2014.1001","url":null,"abstract":"Low dimensional structures of conducting polymers, particularly polypyrrole, have attracted a great attention of researchers and engineers in recent years because of their diverse potential application on account of their unique properties of large aspect ratio, good electrical conductivity, environmental stability and biocompatibility. The present work describes synthesis of polypyrolle microwires by template assisted chemical polymerization at room temperature using FeCl3 as an oxidant. In this technique, the track etch membrane used as a template was fitted between two chambers in a chemical cell in such a way that the template acts as a separating wall between the chambers. One chamber was filled with an aqueous monomer pyrrole solution and other was filled with oxidant reagent of ferric chloride. Chemical polymerization takes place within the pores of the template as the monomer and the oxidant reagent diffuse towards each other, react to yield the conductive polymer which grows as microstructure in the shape of pores of host template. Synthesized samples have been characterized by Scanning Electron Microscopy (SEM), which reveals that the morphology of the microwires matches with the morphology of pores as mould in host template. Diameter, orientation and direction of growth of microwires were almost uniform because of the confined growth of microwires in the ordered and symmetric pores of TEM template. Conductivity of polypyrrole microwires was estimated equal 20.152 S/m form current-voltage characteristics measured using a two-probe-method.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86054974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Enhanced Mathematical Modeling of DOP Plasticizer Migration from PVC into Liquid (Methanol) DOP增塑剂从PVC向液体(甲醇)迁移的改进数学模型

American Journal of Materials Science Pub Date : 2014-01-01 DOI: 10.7726/AJMST.2014.1003

M. Miloudi, A. Yala, M. Mokhtari

引用次数: 0

A Non-polluting Option Using Cathodic Protection for Hydrostatic Testing of Petroleum Tanks with Seawater 用阴极保护进行石油储罐海水水压试验的无污染方案

American Journal of Materials Science Pub Date : 2014-01-01 DOI: 10.5923/j.materials.20140405.02

F. Mainier, P. Nunes, L. P. Gomes, A. Carlos

{"title":"A Non-polluting Option Using Cathodic Protection for Hydrostatic Testing of Petroleum Tanks with Seawater","authors":"F. Mainier, P. Nunes, L. P. Gomes, A. Carlos","doi":"10.5923/j.materials.20140405.02","DOIUrl":"https://doi.org/10.5923/j.materials.20140405.02","url":null,"abstract":"Oil storage tanks and derivatives must be evaluated by hydrostatic testing for leaks in sideways welds, possible cracks and failures that may have occurred during construction. Also in this test are observed defects and cracks in the concrete foundations that support the tank on the ground. The use of seawater as a fluid for hydrostatic testing in storage tank is economically attractive when the storage tanks are located near the sea. Due to its corrosive nature, seawater can cause damage to the internal surface of storage tanks. Generally, corrosion inhibitors and biocides are added to seawater in order to keep the corrosion rate under control. The disposal of water used in hydrostatic testing can represent an environmental problem whereas most corrosion inhibitors are toxic. Hydrostatic tests were run on bench scale tanks to investigate the efficiency of cathodic protection. These tests indicated that an aluminum anode (sacrificial anode) can efficiently replace corrosion inhibitors in storage tanks with the advantage that this corrosion protection system is not hazardous to the environment, as corrosion inhibitors can eventually be. The fixing of anodes in rubber floats and tubular modules represent a major innovation in the inner protection of tanks during the hydrostatic test with sea water.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77628537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Surfactant Assisted Synthesis of Copper Oxide (CuO) Leaf-like Nanostructures for Electrochemical Applications 表面活性剂辅助合成叶状氧化铜纳米结构及其电化学应用

American Journal of Materials Science Pub Date : 2014-01-01 DOI: 10.5923/J.MATERIALS.20140402.03

A. Bello, D. Dodoo‐Arhin, Katlego Makgopa, M. Fabiane, N. Manyala

引用次数: 19

Eco-friendly Synthesis and Characterization of Silver Nanoparticles and Evaluation of Their Antibacterial Activity 生态友好型纳米银的合成、表征及其抗菌活性评价

American Journal of Materials Science Pub Date : 2014-01-01 DOI: 10.7726/AJMST.2014.1002

J. Dhiman, V. Kundu, Suresh Kumar, Ravi Kumar, S. Chakarvarti

引用次数: 5