材料科学与应用期刊(英文)最新文献_第9页

Magnetic Levitation of Diamond Modified with Manganese and Bismuth 锰铋改性金刚石的磁悬浮研究

材料科学与应用期刊(英文) Pub Date : 2021-01-14 DOI: 10.4236/MSA.2021.121005

T. Yamazaki, A. Muraoka

引用次数: 0

The Effect of Material Surface Microstructure on the Enhancement of Bone-Bonding Ability of a Hydroxyapatite-Implant by Low-Intensity Pulsed Ultrasound (LIPUS) 材料表面微结构对低强度脉冲超声(LIPUS)增强羟基磷灰石植入体骨结合能力的影响

材料科学与应用期刊(英文) Pub Date : 2021-01-14 DOI: 10.4236/MSA.2021.121003

M. Kobayashi

{"title":"The Effect of Material Surface Microstructure on the Enhancement of Bone-Bonding Ability of a Hydroxyapatite-Implant by Low-Intensity Pulsed Ultrasound (LIPUS)","authors":"M. Kobayashi","doi":"10.4236/MSA.2021.121003","DOIUrl":"https://doi.org/10.4236/MSA.2021.121003","url":null,"abstract":"Excellent firm bonding between the biomaterials and bone tissue (osseointegration and osteo-conductivity) has been desired for the stability in vivo of dental implants and artificial joints. Much has been learned about this concept, which has led to significant improvements in the design and surface modification of implants in the field of implant dentistry, orthopedic surgery. \u0000We have already reported that low-intensity pulsed ultrasound (LIPUS) irradiation can accelerate the bone bonding ability of the bio-conductive materials such as bioactive titanium and hydroxyapatite implant. However, it is still unclear whether the LIPUS could have same effect to different types of the bioactive-materials. Therefore, in this study, the differences of bone-like hydroxyapatite formation on some kind of hydroxyapatite surface in simulated body fluid (SBF) under the LIPUS irradiation were investigated. Two kinds of hydroxyapatite samples immersed in SBF was exposed to ultrasound waves, the bone-like apatite on the surface was analyzed by Scanning electron microscopy and X-ray diffraction. As a result, the enhancement of hydroxyapatite formation on the surface by LIPUS was confirmed, the initial epitaxial nucleation and crystal growth of apatite depended on crystal structure of the surface of matrix materials.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43693964","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

Surface Modification of Barium Sulfate Particles 硫酸钡颗粒的表面改性

材料科学与应用期刊(英文) Pub Date : 2021-01-14 DOI: 10.4236/MSA.2021.121001

Jérémy Longlade, C. Delaite, Anne-Sophie Schuller

引用次数: 2

High Quality Bio-Oil Obtained from Catalyzed Pyrolysis of Olive Mill Solid Wastes in a Bi-Functional Reactor 双功能反应器催化热解橄榄厂固体废弃物制备高品质生物油

材料科学与应用期刊(英文) Pub Date : 2021-01-14 DOI: 10.4236/MSA.2021.121004

Nabil Tabaja, A. Kassas, S. Hamieh, Rana Haidar, M. Foddis, J. Toufaily, T. Daou, T. Hamieh

{"title":"High Quality Bio-Oil Obtained from Catalyzed Pyrolysis of Olive Mill Solid Wastes in a Bi-Functional Reactor","authors":"Nabil Tabaja, A. Kassas, S. Hamieh, Rana Haidar, M. Foddis, J. Toufaily, T. Daou, T. Hamieh","doi":"10.4236/MSA.2021.121004","DOIUrl":"https://doi.org/10.4236/MSA.2021.121004","url":null,"abstract":"Olive Mill Solid Wastes (OMSW) released in nature without any treatment is a major environmental problem in the Mediterranean region. In this work, the catalyzed pyrolysis of OMSW has been investigated. A catalyst based on SBA-15 mesoporous silica doped with chromium ferrite nanoparticles was prepared by the double solvent technique (DS). The prepared catalyst was characterized by scanning electron microscopy (SEM), Wide and Small Angle X-ray Scattering (WAXS, SAXS), Energy Dispersive X-ray (EDX) and FT-IR spectroscopies. Reverse spinel chromium ferrite nanoparticles were located inside the SBA-15 pores as confirmed by SEM images. The obtained catalyst was tested for pyrolysis reactions of OMSW. Several parameters were studied to optimize the conditions of the pyrolysis reaction in order to increase the bio-oil conversion yield. The GC-MS results demonstrated that the quality of the obtained bio-oil was improved by decreasing the quantity of phenolic and oxygenated components as well as the size of the obtained molecules. The produced bio-oil from pyrolysis of OMSW is identical to that obtained from the pyrolysis of commercial cellulose under the same conditions. A 37% conversion yield of bio-oil was obtained for the best conditions.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46156786","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

Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality 激光粉末床熔化AlSi10Mg零件的激光抛光——初始表面粗糙度对可实现表面质量的影响

材料科学与应用期刊(英文) Pub Date : 2021-01-14 DOI: 10.4236/MSA.2021.121002

M. Hofele, A. Roth, J. Schanz, D. Harrison, A. D. Silva, H. Riegel

{"title":"Laser Polishing of Laser Powder Bed Fusion AlSi10Mg Parts—Influence of Initial Surface Roughness on Achievable Surface Quality","authors":"M. Hofele, A. Roth, J. Schanz, D. Harrison, A. D. Silva, H. Riegel","doi":"10.4236/MSA.2021.121002","DOIUrl":"https://doi.org/10.4236/MSA.2021.121002","url":null,"abstract":"Laser Powder Bed Fusion (LPBF) is an Additive Manufacturing technique, which allows production of highly complex solid metal parts with good mechanical properties, compared to conventionally manufactured parts. Nevertheless, the layer-by-layer fabrication process also offers several disadvantages, including a relatively high surface roughness depending on the shape of the component, its position and orientation during the fabrication process. This paper deals with investigations on the surface roughness reduction capability, and residual surface structures by laser polishing of LPBF AlSi10Mg parts under varying initial surface roughness in order to investigate the influence of the surface behavior and initial surface roughness to the achievable surface quality by laser polishing. Hereto test specimens with varying fabrication orientations regarding to the built platform are printed and further polished. Thereby the initial arithmetic roughness varies between 19.2 μm and 8.0 μm. It could be shown that the achievable surface roughness by laser polishing with continuous and pulsed laser radiation is increasing with rising initial roughness, but the relative roughness reduction is almost constant in the range of 95% - 97.5%. The analyzation of the residual roughness structures shows, that the main roughness differences is found in the middle and long structure wavelength regime, which are directly depending on the initial surface structures of 3D printing.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47719907","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: 11

A Comparative Study into the Engineering Properties of Neem Wood from Ghana 加纳印楝木工程性能的比较研究

材料科学与应用期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/msa.2021.1211031

G. A. Quartey, J. Eshun, Emmanuel Attitsogbui

{"title":"A Comparative Study into the Engineering Properties of Neem Wood from Ghana","authors":"G. A. Quartey, J. Eshun, Emmanuel Attitsogbui","doi":"10.4236/msa.2021.1211031","DOIUrl":"https://doi.org/10.4236/msa.2021.1211031","url":null,"abstract":"A study into the mechanical properties of Neem wood was done to explore the possibility of its usage as a structural material. This paper presents the results of some investigations into the strength properties of Neem (Azadirach-ta indica A. Juss.) and compares them with those of Odum (Milicia excelsa) and European Oak (Quercus spp.) which are well known structural wood species in Ghana and Europe, respectively. The properties were determined using British (BS 373, 1957) and American timber testing specifications (ASTM D143, 1983) using testing methods for small, clear specimens of wood. The results showed that at 12% moisture content the wood has a density of 740 kg/m 3 with a mean modulus of rupture of 8317 N/mm 2 , compressive strength parallel to the grain of 318.8 N/mm 2 , modulus of elasticity of 8644 N/mm 2 , and shear strength parallel to the grain of 17 N/mm 2 . The bending strength (MOR) of Neem is about 30% lower than that of Odum and about 2% higher than Oak. The modulus of elasticity of Neem is about 39% lower than Odum and 43% lower than Oak. The strength properties in the present work suggest that the wood of Neem has a potential for utilisation in structural applications.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70513030","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

Characterization of Dissimilar Welding between 304 Stainless Steel and Gray Iron Using Nickel Coated Electrode 镀镍电极对304不锈钢与灰铸铁异种焊接的表征

材料科学与应用期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/msa.2021.1212041

J. García-Lira, E. Curiel-Reyna, Yajaira-Ilse Curiel-Razo, A. Lara-Guevara, I. Rojas-Rodríguez

引用次数: 2

Characterization of Fired Clay Bricks for an Economic Contribution of the Exploitation of Thicky Clay Deposit 烧结粘土砖的表征及其对厚粘土矿开发的经济贡献

材料科学与应用期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/msa.2021.129027

Ibrahima Diao, M. Diagne, I. Dia

引用次数: 3

Obtaining and Characterization of Biodegradable Composites Reinforced with Microcrystalline Cellulose Fillers 微晶纤维素填料增强可生物降解复合材料的制备与表征

材料科学与应用期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/msa.2021.1212037

Lucas Viana Costa, G. Iulianelli, P. S. R. C. da Silva, F. A. Dos Santos

{"title":"Obtaining and Characterization of Biodegradable Composites Reinforced with Microcrystalline Cellulose Fillers","authors":"Lucas Viana Costa, G. Iulianelli, P. S. R. C. da Silva, F. A. Dos Santos","doi":"10.4236/msa.2021.1212037","DOIUrl":"https://doi.org/10.4236/msa.2021.1212037","url":null,"abstract":"In recent years, there has been a growing discussion about the problems related to the massive use of many synthetic plastic materials, which inevitably leads to an increase in environmental pollution caused by the inappropriate disposal of these materials. In this sense, biodegradable materials have been a subject of great interest, as they are a real alternative to replace these materials and tackle this issue. In this work, fully biodegradable composites were prepared by solution casting method. Microcrystalline cellulose (MCC) and treated microcrystalline cellulose (TMCC) were separately incorporated into biodegradable PLA and PHB matrices at ratios of 3, 5 and 7 wt% and the properties of the obtained biocomposites were evaluated by TGA, DSC, XRD and TD-NMR. From thermal analyses, it was seen that TMCC resulted in better thermal stability and 3 wt% of filler, in general, promoted a more pronounced thermal improvement. Furthermore Tg, Tc and Tm remained practically unchanged after MCC and TMCC addition. From XRD it was seen that the cellulose fillers influence in different ways the matrices, promoting increase or decrease in the degree of crystallinity. Finally, the results obtained by TD-NMR showed a decrease in the T 1 H values for all prepared biocomposites, indicating a good dispersion of the cellulose fillers in the matrices and pointed that the systems containing 3 wt% of cellulose fillers were the most homogeneous formulations.","PeriodicalId":68376,"journal":{"name":"材料科学与应用期刊(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70512725","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

Optical Properties of Iron to 30 eV 铁在30 eV下的光学性质

材料科学与应用期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/msa.2021.1212042

J. Butler, M. Martinez, R. Kilci, G. Evans

引用次数: 0