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Modern Concepts in Material Science最新文献

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Modification of the Oxidized Surface of Titanium to Impart of Bioactivity 钛氧化表面改性对生物活性的影响
Modern Concepts in Material Science Pub Date : 2020-06-22 DOI: 10.33552/MCMS.2020.03.000558
T. Petrovskaya
{"title":"Modification of the Oxidized Surface of Titanium to Impart of Bioactivity","authors":"T. Petrovskaya","doi":"10.33552/MCMS.2020.03.000558","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000558","url":null,"abstract":"Clinical practice has shown that the effectiveness of titanium implants increases significantly when biocompatible bioactive coatings are applied to their surface, which provide a strong bond between the implant and native bone by forming a biologically active layer of hydroxyapatite on the implant surface. In this study ceramic-like polyoxide coatings on titanium were modified with a nanostructured sol-gel film, containing calcium, silicate and phosphate ions, which imparted hydrophilicity, solubility, roughness, adsorption activity to the surface, and increased the content of calcium and phosphate ions on the surface. Due to new properties the surface showed bioactivity in vitro experiment. The experimental samples with a two-layer coating (polyoxide layer and sol-gel film) were kept in cell-free simulated body fluid (SBF) for 4 weeks. During experiment, the pH of the solution changed within the alkaline reaction, which contributed to the crystallization of calcium phosphates. On the surface of the samples, the content of calcium and phosphorus ions increased, and hydroxyapatite crystals formed.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124122077","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
Bending Properties of Graphene Reinforced Aluminium Matrix Composite Produced by Casting Process 铸造石墨烯增强铝基复合材料的弯曲性能
Modern Concepts in Material Science Pub Date : 2020-06-09 DOI: 10.33552/MCMS.2020.03.000557
D. Dışpınar
{"title":"Bending Properties of Graphene Reinforced Aluminium Matrix Composite Produced by Casting Process","authors":"D. Dışpınar","doi":"10.33552/MCMS.2020.03.000557","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000557","url":null,"abstract":"The use of graphene as reinforcement for many materials has become popular due to the enhanced properties it has. In this work, different casting methods were aimed to be used in order to produce graphene reinforced aluminum matrix composites. Sand casting, lost foam casting, die casting and squeeze casting methods were used. Graphene was added as layers and also in aluminum foils for incorporation of the reinforcer to the matrix. It was found that squeeze casting was the best method for the production of composite. Bending strength was increased 25-50% for 0.1 wt% graphene added A356 alloy.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130776573","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
Hall Effect Phenomena 霍尔效应现象
Modern Concepts in Material Science Pub Date : 2020-05-27 DOI: 10.33552/MCMS.2020.03.000556
T. Speliotis
{"title":"Hall Effect Phenomena","authors":"T. Speliotis","doi":"10.33552/MCMS.2020.03.000556","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000556","url":null,"abstract":"","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127090462","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
“Urban Mine” A Modern Source of Materials: Part I Battery Recycling “城市矿山”:现代材料来源:第一部分电池回收
Modern Concepts in Material Science Pub Date : 2020-05-22 DOI: 10.33552/MCMS.2020.03.000555
F. Tedjar
{"title":"“Urban Mine” A Modern Source of Materials: Part I Battery Recycling","authors":"F. Tedjar","doi":"10.33552/MCMS.2020.03.000555","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000555","url":null,"abstract":"Today world population increase and related economy expands are accompanied with important growth of substantial need for natural resources. Consequently, in order to sustain same level of economic activities a great amount of energy and resource are consumed [1]. The energy preoccupation linked to a potential “peak oil” introduces a strong actions on fuel saving and utilization of clean energy. In particular emerging of climate changing problematic and global warming issues from Kyoto protocol [2,3] with impact of greenhouse gases and CO2 are the most important challenges the last 3 decades.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122583128","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
Analysis of Fly Ash and Paramagnetic Nanoparticles with Hybrid Base Fluid Due to Applied Magnetic Dipole in a Stretching Sheet with Momentum Slip Condition: FEM Approach 磁偶极子作用下粉煤灰与顺磁性纳米颗粒混合基底流体在动量滑移条件下拉伸片中的分析:FEM方法
Modern Concepts in Material Science Pub Date : 2020-04-27 DOI: 10.33552/MCMS.2020.03.000554
Y. Nie
{"title":"Analysis of Fly Ash and Paramagnetic Nanoparticles with Hybrid Base Fluid Due to Applied Magnetic Dipole in a Stretching Sheet with Momentum Slip Condition: FEM Approach","authors":"Y. Nie","doi":"10.33552/MCMS.2020.03.000554","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000554","url":null,"abstract":"In this article, a comprehensive analysis is performed for fly ash and paramagnetic ( ) a T nanoparticles with a hybrid base and micro polar fluid with momentum slip conditions over a stretching sheet. With the aid of the similarity transformation, the PDEs obtained are transmuted in the nonlinear ODE system, after which the numerical simulation is performed with the finite element method. The effect of physical parameters on velocity, micro rotation, and temperature are analyzed graphically. Results reveal that the velocity boundary layer thickness for fly ash nanoparticles is higher than paramagnetic and thermal conductivity of paramagnetic is higher than fly ash nanoparticles. The paramagnetic nanoparticles are, therefore, the best coolant. The comparison of the finite element method with previous researches is tabled and found in a good agreement.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128239248","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
Positron Impact Excitation of the nS, nP, and nD States of Atomic Hydrogen 氢原子的nS, nP和nD态的正电子撞击激发
Modern Concepts in Material Science Pub Date : 2020-04-27 DOI: 10.33552/MCMS.2020.03.000553
A. Bhatia
{"title":"Positron Impact Excitation of the nS, nP, and nD States of Atomic Hydrogen","authors":"A. Bhatia","doi":"10.33552/MCMS.2020.03.000553","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000553","url":null,"abstract":"The excitation cross sections of the atomic hydrogen from n=2 ton=6 have been calculated for S, P, and D, from low energies to high incident energies (threshold to 100 eV), using the variational polarized orbital method (hybrid theory). Thirty partial waves been used to obtained converged cross sections. The maximum of elastic and excitation cross sections is at incident energy 26.66 eV.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122227186","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
Towards High Performance CNT-Based Electrode Materials via Chemical Vapor Deposition Approach 化学气相沉积法制备高性能碳纳米管基电极材料
Modern Concepts in Material Science Pub Date : 2020-04-06 DOI: 10.33552/MCMS.2020.03.000552
A. M. Osman, R. Geioushy, O. Fouad
{"title":"Towards High Performance CNT-Based Electrode Materials via Chemical Vapor Deposition Approach","authors":"A. M. Osman, R. Geioushy, O. Fouad","doi":"10.33552/MCMS.2020.03.000552","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000552","url":null,"abstract":"Recently, carbon nanotubes (CNTs) electrodes have increasingly attracted great attention in various applications such as energy storage, conductive adhesive; catalyst supports owing to their unique 1D tubular structure, high specific capacity, large surface area, and high electrical conductivity [1]. CNTs have high ability to mediate rapid electron transfer kinetics for a wide variety of electroactive species. Moreover, CNTs are easily modified and functionalized to suite different biological and environmental applications. However, the performance and the manufacture techniques of CNTs electrode have exposed to scientific researchers to be enhanced. CNTsbased electrodes could be fabricated via compressing and coating technologies. Unfortunately, these techniques have a negative impact on the adsorption performance of the electrode [2] as well as coating detachment after a short period [3]. At the present time, arc discharge, laser ablation, catalytic thermal decomposition and chemical vapor deposition (CVD) techniques have been used to synthesize CNTs [4,5]. Arc discharge and laser ablation are still not applicable in the industry due to the low mass production. Whereas, CVD performs a better production of large quantities of CNTs at a low cost, besides, the strong layer stuck over the substrate which in turn improves the performance of the electrode material and can be reused several times.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129918232","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
Optimization of Process Parameters to Maximize Ultimate Tensile Strength and Hardness of Underwater Friction Stir Welded Aluminium Alloys using Fuzzy Logic 应用模糊逻辑优化水下搅拌摩擦焊接铝合金极限抗拉强度和硬度的工艺参数
Modern Concepts in Material Science Pub Date : 2020-03-31 DOI: 10.33552/MCMS.2020.03.000551
Ibrahim Raad S. Sabry
{"title":"Optimization of Process Parameters to Maximize Ultimate Tensile Strength and Hardness of Underwater Friction Stir Welded Aluminium Alloys using Fuzzy Logic","authors":"Ibrahim Raad S. Sabry","doi":"10.33552/MCMS.2020.03.000551","DOIUrl":"https://doi.org/10.33552/MCMS.2020.03.000551","url":null,"abstract":"This paper addresses the development of a fuzzy model for weld quality prediction. Significant underwater friction stir welding parameters affecting the weld quality are rotational speed, traverse speed, and tool shoulder diameter‎. Welding experiment is performed on AA 1050 aluminium pipes by central composite design to attain maximum tensile strength and hardness of the weld joint. Quality of weld measured in terms of tensile strength and hardness is predicted using fuzzy logic and the results are compared with statistical analysis. Confirmatory experimental results show that the fuzzy model can predict an adequate output with less error than statistical analysis.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"64 5-6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114060189","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
The Adsorption Behavior of Copper Clusters on SiO2 and TiO2 Surfaces: A Computational Study 铜簇在SiO2和TiO2表面的吸附行为:计算研究
Modern Concepts in Material Science Pub Date : 2020-03-18 DOI: 10.33552/MCMS.2020.02.000550
Shenna Shearin
{"title":"The Adsorption Behavior of Copper Clusters on SiO2 and TiO2 Surfaces: A Computational Study","authors":"Shenna Shearin","doi":"10.33552/MCMS.2020.02.000550","DOIUrl":"https://doi.org/10.33552/MCMS.2020.02.000550","url":null,"abstract":"Depletion of petroleum based fossils fuels provoked the pursuit for generating alternative safe and environmentally clean fuels over the past decade. Hydrogen gas (H2) has long been regarded as a promising alternative to fossil fuels. For instance, fuel cells polymer electrolyte membrane fuel cells (PEMFC) are one of the primary sources as high efficiency energy converting devices. In such processes, producing safe storage of explosive hydrogen gas and circumventing the opportunities of leakage remains a challenging task. Compared to gaseous hydrogen gas storage, on-board hydrogen production by reforming liquid hydrogen carriers will be more promising for future commercialization. Steam reforming of alcoholic sources such as methanol, ethanol or glycerol have been investigated comprehensively for their potential to be converted to hydrogen. Methanol steam reforming (MSR) is considered one of the most favorable chemical processes for on-the-fly hydrogen production for several reasons [2,3]. (i) Methanol is in liquid-state at ambient condition; (ii) it has high H-to-C atom ratio; (iii) requirement of relatively low temperatures (200-400 °C) for activation of methanol and (iv) methanol is sulfur-free and can be easily produced from biomass. Various catalysts have been developed for MSR reactions.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"18 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125814277","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
Study of Nanocomposites of Silicon Structures for use in Mechatronics 机电一体化用硅结构纳米复合材料的研究
Modern Concepts in Material Science Pub Date : 2020-03-04 DOI: 10.33552/MCMS.2020.02.000549
S. Kartunov
{"title":"Study of Nanocomposites of Silicon Structures for use in Mechatronics","authors":"S. Kartunov","doi":"10.33552/MCMS.2020.02.000549","DOIUrl":"https://doi.org/10.33552/MCMS.2020.02.000549","url":null,"abstract":"of Pt to the formation of a Schottky barrier at the metal- TiO 2 -terface. This happens because the work function of Pt 5,36-5,63 eV) is greater than that of TiO 2 (~ 4,6-4,7 eV), so that electrons are transferred at Pt and holes Localized in TiO 2 media to improve photocatalytic efficiency. In order to improve the Pt/TiO 2 composites, steps have been taken to optimize the interaction between Pt and TiO 2 from Kandiel, effectively effecting the surface area and crystal structure of TiO 2 in the resulting Pt/TiO 2 composite and demon strating that although the large Area is useful, increasing crystallinity is preferential. Increasing photocatalytic activity is due to the reduction of site defects that act as charge recombination centers when crystallinity increases. Abstract This article analyzes the developments on the subject and draws conclusions for the study 1722/М - 2017 at the UZNIT of TU - Gabrovo BG. Most metals are highly chemically reactive, especially at nanoscale, without having properties that can be easily used with TiO2 composites. As such, most of the metals below will be considered metal oxides of precious metals. In addition, the most common oxide TiO2 will be discussed, as other oxides are probably unstable and thus do not form stable composites.","PeriodicalId":297187,"journal":{"name":"Modern Concepts in Material Science","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130510376","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
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