AIMS Materials Science最新文献_第10页

Tuning the giant Magnetocaloric Effect and refrigerant capacity in Gd1–xYxCrO3 (0.0 ≤ x ≤ 0.9) perovskites nanoparticles 调节Gd1-xYxCrO3(0.0≤x≤0.9)钙钛矿纳米颗粒的巨磁热效应和制冷剂容量

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022018

I. Al-Omari, Muna Al-Mamari, D. Sellmyer

{"title":"Tuning the giant Magnetocaloric Effect and refrigerant capacity in Gd1–xYxCrO3 (0.0 ≤ x ≤ 0.9) perovskites nanoparticles","authors":"I. Al-Omari, Muna Al-Mamari, D. Sellmyer","doi":"10.3934/matersci.2022018","DOIUrl":"https://doi.org/10.3934/matersci.2022018","url":null,"abstract":"Different compounds of rare-earth orthochromites Gd1–xYxCrO3 (where x is 0.0–0.9) powder nanoparticles, were synthesized by the auto-combustion method followed by annealing at 700 ℃. All the compounds showed single-phase and crystallized into a distorted orthorhombic structure with the space group (Pbnm). The average particle size for all the samples were in the range 53–110 nm. The detailed and systematic magnetic measurements and analysis showed that all the samples up to x = 0.9 have large magnetization and large values of the change in the magnetic entropy. The magnitude of the change in the magnetic entropy (at 4.5 K and for all the values of the change in the applied magnetic field between 1 and 9 T) is found to increase with increasing x reaching a maximum value at x = 0.3 then it decreases as we increase the yttrium concentration. The nanoparticle compounds with low yttrium concentrations showed a giant change in the magnetic entropy and a giant relative cooling power. Based on the slopes of Arrott plots curves the order parameter of the magnetic transition has been estimated and found to be second order. The giant change in the magnetic entropy and the relative cooling power were tuned in the rages (-45.6 to -8.7 J/kg·K at a change in the applied magnetic field of 9 T; and 136–746 J/kg), around the helium liquefaction temperature. The magnitude of the change in the magnetic entropy is significantly larger for large range of temperatures, up to the nitrogen liquefaction temperature. The giant change in the magnetic entropy and the giant relative cooling power at low temperatures (in the range about 4 to 20 K.) make these samples candidate materials for the low temperature magnetic refrigerant applications, based on the magnetocaloric effect.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70088065","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

Composite scaffolds of chitosan/polycaprolactone functionalized with protein of Mytilus californiensis for bone tissue regeneration 壳聚糖/聚己内酯加利福尼亚贻贝蛋白功能化复合支架用于骨组织再生

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022021

Miguel-Angel Rojas-Yañez, C. Rodríguez-González, S. Martel-Estrada, L. Valencia-Gómez, C. Vargas-Requena, J. Hernández-Paz, M. Chavarría-Gaytán, I. Olivas-Armendáriz

{"title":"Composite scaffolds of chitosan/polycaprolactone functionalized with protein of Mytilus californiensis for bone tissue regeneration","authors":"Miguel-Angel Rojas-Yañez, C. Rodríguez-González, S. Martel-Estrada, L. Valencia-Gómez, C. Vargas-Requena, J. Hernández-Paz, M. Chavarría-Gaytán, I. Olivas-Armendáriz","doi":"10.3934/matersci.2022021","DOIUrl":"https://doi.org/10.3934/matersci.2022021","url":null,"abstract":"Nowadays, the treatment for bone damage remains a significant challenge. As a result, the development of bioactive three-dimensional scaffolds for bone regeneration has become a key area of study within tissue engineering. This research is focused on the evaluation of the properties of Chitosan (Ch)/Polycaprolactone (PCL) scaffolds with the Mytilus californiensis protein by Thermally Induced Phase Separation (TIPS). This study used the extrapalleal fluid protein from Mytilus californiensis because it increases biological processes that support bone regeneration. Two methodologies were used for the scaffolds functionalization: (I) an immersion process in a solution with the protein and (II) the protein direct addition during the scaffold synthesis. The scaffolds were analyzed by Fourier Transformed Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), and Mechanical Compression test to determine the composition, morphology, and mechanical properties of each material. In vitro analysis of biodegradation, bioactivity, and biocompatibility were also performed. The scaffolds with the protein added directly presented superior properties in the tests of bioactivity and cellular proliferation, making these composites attractive for the area of bone regeneration.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70088169","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

Propagation of corrosion induced fatigue crack in aluminum alloy 铝合金腐蚀疲劳裂纹的扩展

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022030

Pawan Kumar, B. Verma

{"title":"Propagation of corrosion induced fatigue crack in aluminum alloy","authors":"Pawan Kumar, B. Verma","doi":"10.3934/matersci.2022030","DOIUrl":"https://doi.org/10.3934/matersci.2022030","url":null,"abstract":"Aluminium is considered a green metal due to its environmental responsive characteristics. The 7475-T7351 aluminum alloy is extensively used in automotive and aerospace applications due to its light weight and high strength. In the present work, the effects of the corrosive environment on the high cycle fatigue (HCF) behaviors of the 7475-T7351 aluminum alloy was investigated. The aqueous solution of sodium chloride was used for solution treatment. The HCF test was performed on pre-cracked specimens using a servo-hydraulic universal testing machine, Instron 8800. The fractured specimens were characterized using a scanning electron microscope. It was observed that the crack propagation occurred through anodic dissolution at high stress and a significant crack tip blunting and crack extension occurred. However, no appreciable change in crack growth was noticed over the lower frequency range of 0.1 to 0.9 Hz. The slower growth rate envisages oxide debris formation between the cracked faces. When the alloy was treated under corrosive environments, the HCF tests depicted that the fatigue life reduces up to two orders of magnitude. The corrosion pits induced the crack initiation in stage-I at lower alternating stress; however, the fatigue crack growth rate (FCGR) was increased in the corrosive environment. The transition from stage-I to stage-II occurred at a lower stress intensity range (∆K) level; it was due to the combined effects of corrosion, hydrogen embrittlement, active path dissolution, and stress concentration. The corrosion fatigue test at low frequency also depicted a slower FCGR as compared to its moderate frequency counterpart and showed an irregular crack growth behavior.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70088849","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

Experimental evaluation of additively deposited functionally graded material samples-microscopic and spectroscopic analysis of SS-316L/Co-Cr-Mo alloy 添加沉积功能梯度材料样品的实验评价——SS-316L/Co-Cr-Mo合金的显微和光谱分析

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022040

Y. P. Reddy, K. L. Narayana, M. K. Mallik, C. Paul, C. Singh

引用次数: 1

Mechanical analyses of flat sheet water treatment membranes 平板水处理膜的力学分析

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022052

M. Ozdemir, S. Oterkus, E. Oterkus, I. Amin, A. El-Aassar, H. Shawky

引用次数: 0

Materials for Additive Manufacturing 增材制造材料

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022048

John (Ioannis) D. Kechagias

引用次数: 5

Influence of the thermomechanical behavior of NiTi wires embedded in a damper on its damping capacity: Application to a bridge cable 埋在阻尼器中的镍钛丝的热力学性能对阻尼能力的影响:在桥梁电缆上的应用

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2023001

Helbert Guillaume, Dieng Lamine, Chirani Shabnam Arbab, Pilvin Philippe

{"title":"Influence of the thermomechanical behavior of NiTi wires embedded in a damper on its damping capacity: Application to a bridge cable","authors":"Helbert Guillaume, Dieng Lamine, Chirani Shabnam Arbab, Pilvin Philippe","doi":"10.3934/matersci.2023001","DOIUrl":"https://doi.org/10.3934/matersci.2023001","url":null,"abstract":"Thanks to high dissipation properties, embedding NiTi Shape Memory Alloys in passive damping devices is effective to mitigate vibrations in building and cable structures. These devices can inconceivably be tested directly on full-scale experimental structures or on structures in service. To predict their effectiveness and optimize the set-up parameters, numerical tools are more and more developed. Most of them consist of Finite Element models representing the structure equipped with the damping device, embedding parts associated with a superelastic behavior. Generally, the implemented behavior laws do not include all the phenomena at the origin of strain energy dissipation, but stress-induced martensitic transformation only. This article presents a thermomechanical behavior law including the following phenomena: (i) intermediate R-phase transformation, (ii) thermal effects and (iii) strain localization. This law was implemented in a commercial Finite Element code to study the dynamic response of a bridge cable equipped with a NiTi wire-based damping device. The numerical results were compared to full-scale experimental ones, by considering the above-mentioned phenomena taken coupled or isolated: it has been shown that it is necessary to take all of these phenomena into account in order to successfully predict the damping capacity of the device.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089390","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

Synthesis of methyl esters from palm oil, candlenut oil, and sunflower seed oil and their corrosion phenomena on iron nail 棕榈油、花生油和葵花籽油甲酯的合成及其对铁钉的腐蚀现象

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022044

A. Santoso, Novita Agustin, S. Sumari, Siti Marfuah, R. Retnosari, I. B. Rachman, A. Wijaya, Muhammad Roy Asrori

{"title":"Synthesis of methyl esters from palm oil, candlenut oil, and sunflower seed oil and their corrosion phenomena on iron nail","authors":"A. Santoso, Novita Agustin, S. Sumari, Siti Marfuah, R. Retnosari, I. B. Rachman, A. Wijaya, Muhammad Roy Asrori","doi":"10.3934/matersci.2022044","DOIUrl":"https://doi.org/10.3934/matersci.2022044","url":null,"abstract":"Biodiesel products show corrosive properties. Biodiesel contains components of saturated and unsaturated esters which tend to be unstable, sensitive to light, temperature, and metal ions. Thus, the study aims to synthesize biodiesel from various vegetable oils (palm oil, sunflower seed oil, and candlenut oil), and to analyze its corrosiveness to ferrous nails and characterization of biodiesel. The research stages were: synthesis of methyl ester and its characterization, and corrosion test. The results showed that the methyl ester characteristics of the samples meet requirements with SNI7182 : 2015. In GC-MS results, the largest components of methyl esters from candlenut oil and sunflower seed oil were 35.04% methyl oleate and 46.79% methyl oleate respectively, while in palm oil, the largest components were 41.60% methyl oleate and 41.16%. methyl palmitate. Corrosion test showed that the corrosion rate of ferrous nail in biodiesel at room temperature was lower than 70 ℃. Based on GC-MS and SEM results, biodiesel contained high unsaturated fatty acids and had a corrosion rate, i.e., at room temperature, the methyl ester of palm oil, candlenut oil, and sunflower seed oil were 0.006 mpy, 0.011 mpy, and 0.011 mpy respectively, while at 70 ℃, they were 0.011 mpy, 0.016 mpy, and 0.017 mpy, respectively. The results corresponded to SEM results at high temperature and significantly high content of unsaturated fatty acids. It was indicated by the formation of pits.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089462","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

Mechanical properties and dry sliding wear behaviour of Al–Si–Mg alloy by equal channel angular pressing 等径角挤压Al-Si-Mg合金的力学性能及干滑动磨损行为

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2022045

N.F.B.W. Anuar, M. S. Salleh, M. Z. Omar, Saifudin Hafiz Yahaya

{"title":"Mechanical properties and dry sliding wear behaviour of Al–Si–Mg alloy by equal channel angular pressing","authors":"N.F.B.W. Anuar, M. S. Salleh, M. Z. Omar, Saifudin Hafiz Yahaya","doi":"10.3934/matersci.2022045","DOIUrl":"https://doi.org/10.3934/matersci.2022045","url":null,"abstract":"This study investigated the microstructure, hardness, tensile and tribological behaviour of a cooling slope Al–Si–Mg alloy following ECAP and T6 heat treatment. The optical and scanning electron microscopes were applied to investigate the microstructure of the as-cast material and heat-treated ECAPed Al–Si–Mg alloy. The dry sliding wear test was tested with three different loads of 10 N, 50 N, and 100 N with constant sliding speed and sliding distance at 1.0 m/s and 9000 m, respectively, using the pin-on-disc tribometer. The hardness and tensile properties were evaluated through microhardness, UTS, and YS measurement for the as-cast Al–Si–Mg alloy, both heat-treated with and without ECAPed alloys. Moreover, wear rate and COF in the Al–Si–Mg alloy with different loads were analysed and linked with microstructural and strength behaviour after the ECAP process. Meanwhile, these analyses of results were correlated with the behaviour of the as-cast Al–Si–Mg aluminium alloy and heat-treated non-ECAPed alloy. Results demonstrated that a combination of ECAP processing and T6 heat treatment improves the mechanical behaviour, while the COF and wear rate are improved at a load of 100 N.","PeriodicalId":7670,"journal":{"name":"AIMS Materials Science","volume":"2018 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70089468","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

Fe-TiO2/zeolite H-A photocatalyst for degradation of waste dye (methylene blue) under UV irradiation Fe-TiO2/沸石H-A光催化剂在紫外照射下降解废染料(亚甲基蓝

IF 1.8

AIMS Materials Science Pub Date : 2022-01-01 DOI: 10.3934/matersci.2023003

R. Cahyanti, S. Sumari, F. Fajaroh, Muhammad Roy Asrori, Yana Fajar Prakasa

引用次数: 3