材料科学与应用期刊(英文)最新文献_第8页

Preparation of a Cube-Textured Ni-7at.%W Based Template Used for Coated Conductors 立方体织构Ni-7at的制备。用于涂覆导体的%W基模板

材料科学与应用期刊(英文) Pub Date : 2021-06-18 DOI: 10.4236/msa.2021.126017

Xu Zhao, Yuxin Zheng, Fangyuan Zhang, M. Gao

引用次数: 0

Optimization of Activated Carbons Prepared from Parinari macrophylla Shells 巨虾壳制备活性炭的优化研究

材料科学与应用期刊(英文) Pub Date : 2021-05-07 DOI: 10.4236/MSA.2021.125014

D. B. M. Siragi, D. Desmecht, H. Hima, Ousmaila Sanda Mamane, I. Natatou

引用次数: 1

Improvement in Surface Roughness and Hardness for Carbon Steel by Slide Burnishing Process 用滑动抛光法提高碳钢表面粗糙度和硬度

材料科学与应用期刊(英文) Pub Date : 2021-05-07 DOI: 10.4236/MSA.2021.125011

H. Kato, Wataru Hirokawa, Y. Todaka, K. Yasunaga

{"title":"Improvement in Surface Roughness and Hardness for Carbon Steel by Slide Burnishing Process","authors":"H. Kato, Wataru Hirokawa, Y. Todaka, K. Yasunaga","doi":"10.4236/MSA.2021.125011","DOIUrl":"https://doi.org/10.4236/MSA.2021.125011","url":null,"abstract":"Slide burnishing process, which is a surface severe plastic deformation technique, offers an attractive post-machining alternative due to its chip-less and relatively simple operations. The purpose of the present work is to investigate effects of initial turned surface roughness on the burnished surface roughness and hardness in slide burnishing. The carbon steel samples those have different roughness surfaces being treated were prepared by turning by varying the feed. Slide burnishing was then carried out by a silicon nitride ceramic ball that was loaded and fed on the turned surface of a rotating specimen using a lathe machine. It was found that the turned surfaces were smoothed drastically by the burnishing process, and that the Ra and Rz values were reduced at most by a factor of 52 and 21, respectively. However, the smoothing effect of burnishing has limit, and the limited maximum height roughness (Rz*) for burnishing smoothing increased under a higher burnishing force and with a larger ball diameter. When the Rz values of initial turned surfaces were less than the Rz*, the roughness of the burnished surfaces did not depend on the roughness of the initial turned surface and the burnishing force. There was no significant difference in the burnished microstructure and hardness under a specific burnishing force among the initial turned surface roughness, while a higher burnishing force caused a greater increase in surface hardness.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41643267","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: 5

Study of the Physical and Mechanical Properties of Coconut Spathe Fiber Reinforced Obsolete Polymer Composites 椰子渣纤维增强废旧聚合物复合材料的物理力学性能研究

材料科学与应用期刊(英文) Pub Date : 2021-05-07 DOI: 10.4236/MSA.2021.125015

Rabeya Akter, B. Neher, M. Gafur, Rakib Hossain, F. Ahmed

{"title":"Study of the Physical and Mechanical Properties of Coconut Spathe Fiber Reinforced Obsolete Polymer Composites","authors":"Rabeya Akter, B. Neher, M. Gafur, Rakib Hossain, F. Ahmed","doi":"10.4236/MSA.2021.125015","DOIUrl":"https://doi.org/10.4236/MSA.2021.125015","url":null,"abstract":"Fiber-reinforced polymer (FRP) composites have gradually gained wide acceptance as engineering material applications due to their unique advantages including their high strength-to-weight ratio and excellent corrosion resistance. This study was carried out with composites prepared by hot press molding method using coconut spathe fiber as reinforcing material and HDPE (from HDPE can as obsolete polymer) as polymer matrix. Composites were made at 150°C under 60 kN load by taking diverse weight percentage (wt.%) of fiber from 0 to 20 of its total weight. In this research investigation, different properties of the composites such as bulk density, water absorption, tensile and flexural properties, impact strength and hardness test properties were carried out. The fiber content enhancement increases the bulk density in all composites. The rate of water absorption improves with the improvement of fiber addition with respect to HDPE in all composites. But the water absorption was not increased uniformly with the increase of fiber addition in composites. In all cases, composites absorbed water very rapidly up to 80 hrs and then water absorption is in saturated condition. The mechanical properties like tensile strength (TS), flexural strength (FS), impact strength (IS) and hardness were observed to be comparatively more enhanced for 5% composite, while further increasing of fiber addition, all mechanical properties changes irregularly. The irregular nature of change might be caused due to the over loading of fiber in polymer matrix.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"223-238"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48150930","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: 2

The Effect of Annealing Temperature and Reactive Gases on Optical Properties of Cu2O Thin Films 退火温度和反应气体对Cu2O薄膜光学性能的影响

材料科学与应用期刊(英文) Pub Date : 2021-05-07 DOI: 10.4236/MSA.2021.125012

R. Bunea, A. Saikumar, K. Sundaram

{"title":"The Effect of Annealing Temperature and Reactive Gases on Optical Properties of Cu2O Thin Films","authors":"R. Bunea, A. Saikumar, K. Sundaram","doi":"10.4236/MSA.2021.125012","DOIUrl":"https://doi.org/10.4236/MSA.2021.125012","url":null,"abstract":"The Cu2O thin films were synthesized by using RF sputtering technique. Comparisons were made with films created by deposition at room temperature followed by thermal annealing between 100°C and 400°C and using different gases, oxygen (O2) (oxidizing and reactive gas) and nitrogen (N2) (inert gas), besides air. The thickness of the thin films was kept constant, around 2000 A (Angstrom). In addition, the RF power and pressure deposition were kept constant, as well. The thin films were evaluated for a range of wavelengths between 200 nm and 400 nm (Ultra Violet spectrum), 400 nm and 700 nm (Visible spectrum), 700 nm and 800 nm (Infrared spectrum) for both, optical transmittance and photoluminescence. From the experimental results, the higher annealing temperature and the introduction of nitrogen (N2) gas produced the following results: the optical bandgap for the Cu2O was found to be 2.23 eV and photoluminescence peaks were around 551 nm and 555 nm, which matched the theoretical analyses. Overall, there was a decrease in the optical bandgap of the Cu2O from 2.56 eV at room temperature to 2.23 eV for the film annealed in nitrogen gas at 400°C. This indicates that the Cu2O is a potential candidate in solar cell applications.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41402417","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

Effect of Model Height and Model Position on Forming Table on Mouthguard Thickness in Thermoforming Using Circular Frame 圆形框架热成形中模型高度和模型位置对成形台护板厚度的影响

材料科学与应用期刊(英文) Pub Date : 2021-05-07 DOI: 10.4236/MSA.2021.125013

Mutsumi Takahashi, Yogetsu Bando

{"title":"Effect of Model Height and Model Position on Forming Table on Mouthguard Thickness in Thermoforming Using Circular Frame","authors":"Mutsumi Takahashi, Yogetsu Bando","doi":"10.4236/MSA.2021.125013","DOIUrl":"https://doi.org/10.4236/MSA.2021.125013","url":null,"abstract":"Effectiveness and safety of mouthguards are greatly affected by its thickness. The aim of this study was to clarify the effect of model height and model position on the forming table on the mouthguard thickness in thermoforming using a circular frame. Mouthguards were thermoformed using 4.0-mm-thick ethylene-vinyl-acetate sheets and a vacuum forming machine. The sheet was sandwiched between circular frames and fixed to the clamp of the forming machine. Working models were two types of hard gypsum models trimmed so that the height of the anterior part was 25 mm (Model A) and 30 mm (Model B). The model was placed with its anterior rim positioned 40 mm (P40), 30 mm (P30), 20 mm (P20), or 10 mm (P10) from the front of the forming table. Differences in the reduction rate of the thickness due to the model height and model positions were analyzed by two-way ANOVA and Bonferroni’s multiple comparison test. Differences depending on the model height were observed at P40 at the incisal edge and P30, P20, and P10 on the labial surface, and the reduction rate of the thickness was significantly smaller in Model A (P < 0.01). As the distance from the model anterior rim to the front of the forming table was smaller, the rate of the thickness of the incisal edge and the labial surface decreases became larger. The rate of decrease in the thickness of the cusp and buccal surface was the smallest at P20. This study indicated that the difference in the thickness of the single-layer mouthguard depending on the model position on the forming table is affected by the model height. However, that is only the anterior part of the mouthguard, and the difference in thickness reduction rate is less than 5%. Additionally, in order to perform stable forming, it is useful to increase the distance from the model to the frame, and it is important to position the part whose thickness is desired to be maintained in the center of the forming table.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"197-206"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49007215","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

Thermodynamic Properties of CaCl2-CaF2-CaO System: Phase Diagram Investigation CaCl2-CaF2-CaO体系热力学性质的相图研究

材料科学与应用期刊(英文) Pub Date : 2021-04-09 DOI: 10.4236/MSA.2021.124009

Julien Claquesin, M. Gibilaro, L. Massot, O. Lemoine, G. Bourgès, P. Chamelot

{"title":"Thermodynamic Properties of CaCl2-CaF2-CaO System: Phase Diagram Investigation","authors":"Julien Claquesin, M. Gibilaro, L. Massot, O. Lemoine, G. Bourgès, P. Chamelot","doi":"10.4236/MSA.2021.124009","DOIUrl":"https://doi.org/10.4236/MSA.2021.124009","url":null,"abstract":"The CaCl2-CaF2-CaO phase diagram was investigated in the CaO low region (<40 mol.%). CaCl2-CaF2 and CaCl2-CaO binary diagrams, constituting the ternary system, were first studied by Differential Scanning Calorimetry (DSC) measurements and X-Ray Diffraction (XRD) characterization; a good agreement was obtained between the phase diagram models calculated with FactSage® software (FTsalt database) and present experimental data. As the CaF2-CaO liquidus could not be measured by DSC due to the high melting temperature, this diagram was calculated using FTsalt database combined with FToxid database of FactSage® software. The ternary phase diagram was obtained by calculations and exhibits an eutectic at the composition CaCl2-CaF2-CaO (78.2-15.7-6.1 mol.%) melting at 637°C, and five peritectic points. Measurements of relevant vertical cross-sections for three CaCl2-CaF2 compositions (50-50, 40-60 and 30-70 mol.%) up to 18 mol.% CaO are in agreement with the ternary phase diagram model. For each section, the liquidus temperature is constant up to around 11 mol.% CaO and then sharply increases. Moreover, an increase of CaF2 content in CaCl2-CaF2 melt leads to a decrease of the CaO solubility in isothermal condition.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"139-151"},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47836391","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: 2

Impact of Cr Substitution on Structural, Magnetic, Electric and Impedance Study of Mn-Ni-Zn Ferrites Cr取代对Mn-Ni-Zn铁氧体结构、磁性、电学和阻抗研究的影响

材料科学与应用期刊(英文) Pub Date : 2021-03-26 DOI: 10.4236/MSA.2021.123008

S. Haque, S. Mazumdar, M. Khan, M. Das

{"title":"Impact of Cr Substitution on Structural, Magnetic, Electric and Impedance Study of Mn-Ni-Zn Ferrites","authors":"S. Haque, S. Mazumdar, M. Khan, M. Das","doi":"10.4236/MSA.2021.123008","DOIUrl":"https://doi.org/10.4236/MSA.2021.123008","url":null,"abstract":"A series of Cr3+-substituted Mn-Ni–Zn ferrites; Mn0.5Ni0.1Zn0.4Fe2-xCrxO4 (x = 0.0 - 0.4 in a step of 0.1) were prepared by traditional solid-state reaction route. The structural, magnetic, dielectric properties and impedance spectroscopy of these compositions were studied. Phase identification and lattice constant (a0) determination were carried out by X-ray diffraction (XRD). The XRD patterns established the fabrication of a single-phase spinel structure. The FESEM micrographs exposed that the average grain size () increased slightly with chromium (Cr) substitution and then decreased for a higher concentration of chromium in the composition. The real part of initial permeability () diminished owing to the enhanced porosity of the compositions with the increase of Cr3+ content in the composition. The highest relative quality factor (RQF) was attained for the samples with x = 0.1. The magnetic hysteresis was investigated to know the effect of Cr3+ substitution in the composition of the magnetic properties. The decrease of saturation magnetization (Ms) with an enhancement in Cr3+ might be triggered by switching of Fe3+ ions from octahedral to tetrahedral site. The samples with x = 0.1 exhibited the highest anisotropy constant (K). Curie temperatures of the investigated samples were significantly modified to lower temperatures with the Cr3+ content. The frequency characteristics of dielectric properties and impedance spectroscopy had been investigated. The highest dielectric constant (e') and resistivity were observed for x = 0.1 and x = 0.2 samples. The complex impedance spectra analysis reveals in-depth information about the conduction mechanism, microstructure, and orientation of the grains in the samples.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"121-138"},"PeriodicalIF":0.0,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47759168","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: 2

Effect of Durian Peel Ash Added in Zinc Oxide/Reduced Graphene Oxide Composites Used as a Chemical Sensor for Hydrazine Detection 榴莲皮灰在氧化锌/还原氧化石墨烯复合材料用作肼检测化学传感器中的作用

材料科学与应用期刊(英文) Pub Date : 2021-02-03 DOI: 10.4236/MSA.2021.122007

Santi Rattanaveeranon, Knavoot Jiamwattanapong, Nattaphorn Jandee

{"title":"Effect of Durian Peel Ash Added in Zinc Oxide/Reduced Graphene Oxide Composites Used as a Chemical Sensor for Hydrazine Detection","authors":"Santi Rattanaveeranon, Knavoot Jiamwattanapong, Nattaphorn Jandee","doi":"10.4236/MSA.2021.122007","DOIUrl":"https://doi.org/10.4236/MSA.2021.122007","url":null,"abstract":"As the hydrazine is toxic, the methods to detect hydrazine at low concentrations are essential in scientific research. This preliminary study reported on how to increase the efficiency of ZnO/reduced graphene oxide (rGO) by adding durian peel ash (DPA) and using three-electrode method. The ZnO/rGO composites were prepared using chemical reaction of graphene oxide (GO) with zinc chloride. The rGO was prepared by the chemical reduction of GO using hydrazine. The properties of the samples were investigated using scanning electron microscopy, atomic force microscopy, X-ray diffraction, and Potentiostat/Galvanostat. The results showed that the optimal condition for the composite material was 70%DPA:30%ZnO/rGO with the sensitivity of 222.92 mA/mM·cm2 and the current density up to 116.50 ± 0.95 A/g. The relationship between the current and the hydrazine concentration was I (μA) = 48.69 + 21.91C (mM) with R2 of 0.9870. The minimum concentration of hydrazine solution that the modified electrode can measure was 0.125 mM. The DPA powder can then be used to enhance the hydrazine detection efficiency at low concentrations.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"111-120"},"PeriodicalIF":0.0,"publicationDate":"2021-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41634612","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

Preparation of Anatase Titanium Dioxide Nanoparticle Powders Submitting Reactive Oxygen Species (ROS) under Dark Conditions 暗条件下氧化钛纳米粉体的制备

材料科学与应用期刊(英文) Pub Date : 2021-02-03 DOI: 10.4236/MSA.2021.122006

T. Nguyen, P. Lemaitre, Masaki Kato, K. Hirota, K. Tsukagoshi, H. Yamada, Atsuki Terabe, Hidetoshi Mizutani, S. Kanehira

{"title":"Preparation of Anatase Titanium Dioxide Nanoparticle Powders Submitting Reactive Oxygen Species (ROS) under Dark Conditions","authors":"T. Nguyen, P. Lemaitre, Masaki Kato, K. Hirota, K. Tsukagoshi, H. Yamada, Atsuki Terabe, Hidetoshi Mizutani, S. Kanehira","doi":"10.4236/MSA.2021.122006","DOIUrl":"https://doi.org/10.4236/MSA.2021.122006","url":null,"abstract":"Recently, under the circumstances of pandemic of COVID-19 much attention has been paid to titanium dioxide TiO2 as bactericidal agent; however, conventional TiO2 requires ultraviolet radiation or visible light to exercise its photocatalytic properties and its induced antimicrobial activity. In order to expand its applications directed at wide civil life, antibacterial TiO2 being usable under dark conditions has been demanded. The present paper describes the powder characterization of newly developed potassium K and phosphorous P co-doped nanometer-size anatase TiO2 powders using X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM & TEM), Brunauer-Emmett-Teller method (BET), fourier-transform infrared spectroscopy (FT-IR), X-ray absorption fine structure (XAFS), electron spin resonance (ESR) and chemiluminescence (CL). It was found for the first time that thus prepared anatase TiO2 could submit much reactive oxygen species (ROS) even in the dark, which has close relation with bactericidal activity in light interception.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"12 1","pages":"89-110"},"PeriodicalIF":0.0,"publicationDate":"2021-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45606421","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: 2