ChemRN: Engineering Materials (Topic)最新文献

Rapid Effective Reduction by Microwave-Irradiated Thermal Reaction for Large-Scale Production of High-Quality Reduced Graphene Oxide 微波辐照热反应快速有效还原大规模生产高质量还原氧化石墨烯

ChemRN: Engineering Materials (Topic) Pub Date : 2021-11-01 DOI: 10.2139/ssrn.3935546

Ok-Kyung Park, Nam Hoon Kim, J. Lee

{"title":"Rapid Effective Reduction by Microwave-Irradiated Thermal Reaction for Large-Scale Production of High-Quality Reduced Graphene Oxide","authors":"Ok-Kyung Park, Nam Hoon Kim, J. Lee","doi":"10.2139/ssrn.3935546","DOIUrl":"https://doi.org/10.2139/ssrn.3935546","url":null,"abstract":"In this study, we suggest a simple and effective one-pot hybrid reduction process for the mass production of high-quality reduced graphene oxide (rGO) by simultaneously doing deoxygenation and healing reactions. During the microwave-irradiated thermal reduction, intercalated benzene in the GO easily generates carbon atoms by pyrolysis; the released carbon atoms react with surrounding defect sites in the GO surface to successfully form new C-C bonds. As a result of the newly formed sp2-hybridized C-C bond in the rGO surface, the defect-repaired rGO (rGO-B) shows remarkably enhanced crystallinity (ID/IG ratio: rGO-B, 0.63; rGO-T, 1.08), thermal stability, and electrical properties over that of rGO prepared without a carbon-source supplement (rGO-T). Especially, compared to the rGO-T, the rGO-B had 4.4 times more carrier density and 18 times increased carrier mobility because of the restoration of defect sites in the rGO-B surface. The rGO-B exhibited six times higher electrical conductivity than did rGO-T because of the improved carrier mobility. These results obviously suggest that the reduction of GO by means of microwave-irradiated thermal reduction with a carbon-source supplement could be a powerful approach for commercial mass production of high-quality rGO because of its easy manufacturing approach.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"11 13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132361331","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: 10

Buckling sensitivity of three-layered annular plates in temperature field on the rate of imperfection 三层环形板在温度场中的屈曲灵敏度对缺陷率的影响

ChemRN: Engineering Materials (Topic) Pub Date : 2021-06-16 DOI: 10.2139/ssrn.3868222

D. Pawlus

引用次数: 0

Experimental Study on the Root-Deck Fatigue Crack on Orthotropic Steel Decks 正交各向异性钢甲板根甲板疲劳裂纹试验研究

ChemRN: Engineering Materials (Topic) Pub Date : 2021-03-15 DOI: 10.2139/ssrn.3805228

Dalei Wang, Xiang Cheng, Yihu Ma, Airong Chen, Benjin Wang

引用次数: 24

Behaviour of Rectangular Concrete Beams Reinforced Internally With HFRP Reinforcements Under Pure Torsion 内加HFRP筋矩形混凝土梁在纯扭转作用下的性能

ChemRN: Engineering Materials (Topic) Pub Date : 2020-03-13 DOI: 10.31224/osf.io/k5r72

P. Kapildev, K. G.

引用次数: 0

Effects of Tree Species and Wood Fiber Size in the Core Layer on the Formaldehyde Emission of Three-Layers Fiberboard 树种和芯层木材纤维尺寸对三层纤维板甲醛释放量的影响

ChemRN: Engineering Materials (Topic) Pub Date : 2019-12-20 DOI: 10.2139/ssrn.3654091

N. Ayrilmiş, Turgay Akbulut, Elif Yurttaş, R. N

引用次数: 0

The Static and Dynamic Characteristic of Elliptical Journal Bearing Lubricated with Couple-Stress Fluid 耦合应力流体润滑椭圆轴颈轴承的静动态特性

ChemRN: Engineering Materials (Topic) Pub Date : 2019-10-01 DOI: 10.2139/ssrn.3462231

Maulik Ukani, Puneet Mathur

引用次数: 1

Investigation on Ferrock Based Mortar an Environment Friendly Concrete 铁岩基砂浆环保型混凝土的研究

ChemRN: Engineering Materials (Topic) Pub Date : 2019-09-29 DOI: 10.2139/ssrn.3461209

Mouli Prashanth V, G. V, D. M.

引用次数: 1

The Mechanical Response of a α2(Ti3Al)+γ(TiAl)-Nanograined Al2O3 Cermet Under Dynamic Compression: Modeling and Experiment α2(Ti3Al)+γ(TiAl)-纳米Al2O3陶瓷在动态压缩下的力学响应:建模与实验

ChemRN: Engineering Materials (Topic) Pub Date : 2019-05-26 DOI: 10.2139/ssrn.3394562

B. Amirian, H. Li, J. Hogan

{"title":"The Mechanical Response of a α2(Ti3Al)+γ(TiAl)-Nanograined Al2O3 Cermet Under Dynamic Compression: Modeling and Experiment","authors":"B. Amirian, H. Li, J. Hogan","doi":"10.2139/ssrn.3394562","DOIUrl":"https://doi.org/10.2139/ssrn.3394562","url":null,"abstract":"Novel experimental data, obtained using an advanced digital image correlation technique coupled to ultra-high-speed photography, have been used to develop and validate a microstructure-dependent constitutive model for α2(Ti3Al) + γ(TiAl)- nanograined Al2O3 cermet. Utilizing experimental characterization for important simulation inputs (e.g., microstructural features size, constituent stiffness), the numerical model makes use of a variational form of the Gurson model, based on the nonlinear homogenization approach, to account for the experimentally observed deformation features in this composite (e.g., void deformation and growth, particle fracture). By considering the variability in microstructural features (e.g., particle shape, size, and aspect ratio), as well as densely packed ceramic particles, the proposed model is evaluated by comparing the numerical responses to experimental results for quasi-static and dynamic stress-strain behavior of the material. The results show that the proposed approach is able to accurately predict the mechanical response and deformation of the microstructure. Once validated, the model is expanded for studying the predominant damage mechanisms in this material, as well as determining important mechanical response features such as transitional strain rates, flow stress hardening, extensive flow softening, and energy absorbing efficiency of the material as a function of void and particle volume fraction under high strain rate loading. The totality of this work opens promising avenues for qualitative (damage micromechanisms) and quantitative (stress-strain curve) understanding of ceramic-metal composites under various loading conditions, and offer insights for designing and optimizing cermet microstructures.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130685749","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

No Erosion Criterion for Granular Filters Based on Constriction Size – An Experimental Study 基于收缩尺寸的颗粒过滤器无侵蚀准则的实验研究

ChemRN: Engineering Materials (Topic) Pub Date : 2019-04-30 DOI: 10.34218/IJARET.10.2.2019.036

Mohan Das C, Dr. M S Girish, Vishnu V K

{"title":"No Erosion Criterion for Granular Filters Based on Constriction Size – An Experimental Study","authors":"Mohan Das C, Dr. M S Girish, Vishnu V K","doi":"10.34218/IJARET.10.2.2019.036","DOIUrl":"https://doi.org/10.34218/IJARET.10.2.2019.036","url":null,"abstract":"Filters are provided in embankments in order to arrest the eroded soil particles that are carried by the seepage water .Current design method of graded filters was developed by Terzaghi which is based on the particle size distribution of the filter material and the base material. This paper presents an attempt to develop filter design criteria in relation to constriction size in gravel filters. It is an alternative approach from the conventional filter design criteria of Terzaghi, which is based on the particle size distribution of the filter media and base material. In his study a criterion for filter to prevent erosion is proposed based on the constriction size distribution of the filter media. The proposed constriction size-based criterion, C10/d95 2 directly compares the controlling constriction size (C10) with the specific representative base size (d95) defines the effectiveness of filters, hence it is a more effective method compared to the Terzaghi criterion (D15 /d85<5) which is based purely on particle size. This ratio explains the behavior of filters more clearly and is proved by a number of tests on various base-filter combinations. When compared to Terzaghi criteria, constriction size distribution criterion proves to be more effective.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115969064","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

Development of Sustainable Mortar from Waste Paper Pulp Ash 利用废纸纸浆灰渣开发可持续砂浆

ChemRN: Engineering Materials (Topic) Pub Date : 2019-04-27 DOI: 10.2139/ssrn.3379024

D. Agrawal, S. Raut

{"title":"Development of Sustainable Mortar from Waste Paper Pulp Ash","authors":"D. Agrawal, S. Raut","doi":"10.2139/ssrn.3379024","DOIUrl":"https://doi.org/10.2139/ssrn.3379024","url":null,"abstract":"In developing countries, disposal of waste generated from industries and agriculture sector is a major concern. Use of such industrial/agricultural waste in construction can be the viable solution not only for environmental pollution but also for land disposal problems. In view of developing sustainable mortar, waste paper pulp ash is used as a partial replacement of cement in various range from 5% to 20% with increment of 5%. The physico-chemical properties of the obtained waste paper pulp ash were studied, and it was observed that the silica content was about 29.25% which is near to silica content in cement. Two mortar mixes 1:4 and 1:6 proportion were designed. Mortar cubes were prepared for different mixes and were cured for various curing periods. The developed mortar mixes were tested for the various physico-mechanical tests viz. compressive strength, flexural brick bond strength, shear brick bond strength and shrinkage limit test. The test results revealed that as the content of the waste increased, the water to cement ratio for the mix was also significantly increased, since the wastepaper pulp has a high degree of water absorption. At the optimum dose of 10% replacement of waste paper pulp ash, the compressive, flexural brick bond and shear brick bond strength was increased by 10% as compared to control mix. Therefore, development of sustainable mortar using waste paper pulp ash will be helpful to survive environment from industrial pollution.","PeriodicalId":156312,"journal":{"name":"ChemRN: Engineering Materials (Topic)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129775496","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