Materials Science eJournal最新文献_第7页

The Role of Grain Boundary Curvature in Diffusional Deformation: Control of Grain Boundary Sliding by Grain Boundary Mobility 晶界曲率在扩散变形中的作用:由晶界迁移率控制晶界滑动

Materials Science eJournal Pub Date : 2020-10-19 DOI: 10.2139/ssrn.3714495

F. Delannay

引用次数: 0

Inhibiting Stress Corrosion Cracking by Removing Corrosion Products from the Mg-Zn-Zr Alloy Pre-Exposed to Corrosion Solutions 通过去除预暴露于腐蚀溶液中的Mg-Zn-Zr合金的腐蚀产物来抑制应力腐蚀开裂

Materials Science eJournal Pub Date : 2020-10-19 DOI: 10.2139/ssrn.3714499

E. Merson, V. Poluyanov, P. Myagkikh, D. Merson, A. Vinogradov

{"title":"Inhibiting Stress Corrosion Cracking by Removing Corrosion Products from the Mg-Zn-Zr Alloy Pre-Exposed to Corrosion Solutions","authors":"E. Merson, V. Poluyanov, P. Myagkikh, D. Merson, A. Vinogradov","doi":"10.2139/ssrn.3714499","DOIUrl":"https://doi.org/10.2139/ssrn.3714499","url":null,"abstract":"Abstract Magnesium and its alloys are susceptible to stress-corrosion cracking (SCC), which can manifest itself during the slow-strain rate tensile (SSRT) testing in air if the specimens were pre-exposed to corrosive media. This phenomenon is generally associated with hydrogen embrittlement (HE) which is believed to be related to diffusible hydrogen penetrating into the metal during the pre-exposure. In the present study, we show that the corrosion product layer deposited on the surface of the pre-exposed specimens is crucial in the SCC mechanism. The specimens of the alloy ZK60 were SSRT tested in air, in corrosive media, in air after pre-exposure to corrosive media as well as after pre-exposure and removal of corrosion products. To vary the severity of SCC, four NaCl-based corrosion solutions were utilised. The embrittlement resulted in a marked decrease in ductility and the concurrent appearance of multiple side-surface cracks as well as brittle fragments on the fracture surface. The most striking finding of the present study is that the removal of corrosion products from the surface of the pre-exposed specimens results in complete recovery of the mechanical response and in the elimination of all harmful embrittling features regardless of the corrosive solution used. This effect is found to be inconsistent with the common viewpoint where the SCC mechanism is governed entirely by diffusible hydrogen. The obtained results shed new light on the role of diffusible hydrogen, corrosion products and irreversible corrosion damage in the SCC mechanism of Mg alloys pre-exposed to corrosive media.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78489265","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: 27

Catalytic Hydrocracking of Synthetic Polymers into Grid-Compatible Gas Streams 合成聚合物催化加氢裂化成网格相容气流

Materials Science eJournal Pub Date : 2020-10-12 DOI: 10.2139/ssrn.3696768

Wei-Tse Lee, Felix D. Bobbink, Antoine P. van Muyden, Kun-Han Lin, C. Corminboeuf, R. Zamani, P. Dyson

{"title":"Catalytic Hydrocracking of Synthetic Polymers into Grid-Compatible Gas Streams","authors":"Wei-Tse Lee, Felix D. Bobbink, Antoine P. van Muyden, Kun-Han Lin, C. Corminboeuf, R. Zamani, P. Dyson","doi":"10.2139/ssrn.3696768","DOIUrl":"https://doi.org/10.2139/ssrn.3696768","url":null,"abstract":"Summary The use of methane as one of the cleanest energy sources has attracted significant public awareness, and methane production processes with less environmental impact than fracking are receiving considerable attention. Catalytic hydrocracking of plastic materials has been considered a potential clean alternative. However, catalysts that convert heterogeneous plastic feeds into a single product under industrially relevant conditions are lacking. Here, we describe a Ru-modified zeolite that catalytically transforms polyethylene, polypropylene, and polystyrene into grid-compatible methane (>97% purity), at 300°C–350°C using near-stoichiometric amounts of H2. Mechanistic studies reveal a chain-end initiation process with limited isomerization of plastic substrates. A Ru site-dominant mechanism is proposed based on these studies and density functional theory (DFT) computations. We foresee that such a plastic-to-methane process may increase the intelligent use of plastic waste via energy recovery. There is also the potential to accommodate emerging sustainable H2 production into existing natural gas networks, while integrating waste management, fuel production, and energy storage.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89592682","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: 28

Enhanced Mechanical Properties and Corrosion Resistance of 316l Stainless Steel by Pre-Forming a Gradient Nanostructured Surface Layer and Annealing 梯度纳米结构预成形和退火提高316l不锈钢的力学性能和耐蚀性

Materials Science eJournal Pub Date : 2020-10-05 DOI: 10.2139/ssrn.3692992

Y. Lei, Zexuan Wang, B. Zhang, Zhengping Luo, Jian Lu, K. Lu

引用次数: 64

Development of a Formulation for Light Stabilizers To Protect Dyed Cotton Knitted Fabrics Against Light 染色棉针织织物防光稳定剂配方的研制

Materials Science eJournal Pub Date : 2020-10-01 DOI: 10.15587/1729-4061.2020.211495

O. Semeshko, Yulia Saribyekova, T. Asaulyuk, Nataliia Skalozubova, S. Myasnikov

{"title":"Development of a Formulation for Light Stabilizers To Protect Dyed Cotton Knitted Fabrics Against Light","authors":"O. Semeshko, Yulia Saribyekova, T. Asaulyuk, Nataliia Skalozubova, S. Myasnikov","doi":"10.15587/1729-4061.2020.211495","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.211495","url":null,"abstract":"Mathematical planning of the experiment was used to develop a formulation for light stabilizers to improve the lightfastness of cotton knitwear coloration, dyed with active dyes, in order to produce comfortable and high-quality knitted clothes. The variance and factor analyses of the experiment's results were performed, which was carried out according to the scheme of the Latin cube of the first order involving the variation of factors – the type of light stabilizers and their concentration. The technological mode of application of light stabilizers implied the impregnation of knitted fabric, drying, and thermal fixation of the material. For the dyed knitwear samples, we have investigated the individual influence of light stabilizers on changing the color of the dyed knitted fabric and the kinetics of coloration photodegradation. The samples were insolated using the device with mercury-tungsten lamp RF 1201 BS (\"REFOND\", China). Following the treatment and insolation, the general color differences of knitwear samples were determined in comparison with the non-treated material, using the TCR-200 colorimeter (\"PCE Instruments\", Germany). The effectiveness of the developed formulation for light stabilizers was confirmed in the study of the lightfastness of knitted fabrics such as pique weave, 1+1 eraser, smooth surface, dyed with active dyes of the brand Bezaktiv (\"CHT Bezema\", Czech Republic). The result of our study is the developed formulation of light stabilizers consisting of 2,4-dihydroxy benzophenone, a UV-absorber, and hydroquinone, an antioxidant, at concentrations of 2 and 1 % of the material weight, respectively, which ensures an increase in the lightfastness of cotton knitwear coloration by 52.9‒66.8 % regardless of weave and active dye","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83281074","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

Advances in Electrospun Scaffolds Towards Meniscus: From Tissue Engineering to Repair and Regeneration 半月板电纺丝支架的研究进展:从组织工程到修复和再生

Materials Science eJournal Pub Date : 2020-09-21 DOI: 10.2139/ssrn.3676763

Xiaoyun Wang, Changlei Xia, X. Mo, Jinglei Wu

{"title":"Advances in Electrospun Scaffolds Towards Meniscus: From Tissue Engineering to Repair and Regeneration","authors":"Xiaoyun Wang, Changlei Xia, X. Mo, Jinglei Wu","doi":"10.2139/ssrn.3676763","DOIUrl":"https://doi.org/10.2139/ssrn.3676763","url":null,"abstract":"The meniscus plays a critical role in maintaining the homeostasis, biomechanics, and structural stability of the knee joint. Unfortunately, it is predisposed to damages either from sports-related trauma or age-related degeneration. The meniscus has an inherently limited capacity for tissue regeneration. Self-healing of injured adult menisci only occurs in the peripheral vascularized portion, while the spontaneous repair of the inner avascular region seems never happens. Repair, replacement, and regeneration of menisci through tissue engineering strategies are promising to address this problem. Recently, many scaffolds for meniscus tissue engineering have been proposed for both experimental and preclinical investigations. Electrospinning is a feasible and versatile technique to produce nano- to micro-scale fibers that mimic the microarchitecture of native extracellular matrix and is an effective approach to prepare nanofibrous scaffolds for constructing engineered meniscus. Electrospun scaffolds are reported to be capable of inducing colonization of meniscus cells by modulating local extracellular density and stimulating endogenous regeneration by driving reprogramming of meniscus wound microenvironment. Electrospun nanofibrous scaffolds with tunable mechanical properties, controllable anisotropy, and various porosities have shown promises for meniscus repair and regeneration and will undoubtedly inspire more efforts in exploring effective therapeutic approaches towards clinical applications. In this article, we review the current advances in the use of electrospun nanofibrous scaffolds for meniscus tissue engineering and repair and discuss prospects for future studies.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79572842","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

Defects and Properties in Polymorph of ZnO ZnO晶型中的缺陷与性能

Materials Science eJournal Pub Date : 2020-09-06 DOI: 10.2139/ssrn.3687642

Kenate Nemera

引用次数: 0

Lattice Parameter of Cementite Phase in Pearlite Structure 珠光体结构中渗碳相的晶格参数

Materials Science eJournal Pub Date : 2020-09-04 DOI: 10.2139/ssrn.3674208

N. Koga, L. Yin, O. Umezawa, Takayuki Yamashita, S. Morooka, T. Kawasaki, S. Harjo

引用次数: 0

Recent Advances in Light-Induced Cell Sheet Technology 光诱导细胞片技术的最新进展

Materials Science eJournal Pub Date : 2020-09-02 DOI: 10.2139/ssrn.3674117

Zhiwei Jiang, Danji Zhu, Ke Yu, Yue Xi, Xiaozhao Wang, Guoli Yang