Research & Development in Material Science最新文献_第5页

Nonwoven Hemp Fibre Reinforced Acrodur Biocomposites and their Mechanical Performance in Immersed Water 非织造麻纤维增强Acrodur生物复合材料及其在水中的力学性能

Research & Development in Material Science Pub Date : 2020-11-20 DOI: 10.31031/RDMS.2020.14.000838

Islam Ms

引用次数: 0

Bipolar Plates Injection Molded for Series Production 双极板注塑成型，批量生产

Research & Development in Material Science Pub Date : 2020-11-11 DOI: 10.31031/RDMS.2020.14.000836

T. Hickmann

引用次数: 0

Vibrational Analysis and Electrical Conduction Mechanism Investigations ofOrder Disorder Phase Transitions in [N(C3H7)4]2ZnBr4Compound [N(C3H7)4] 2znbr4化合物有序无序相变的振动分析及导电机理研究

Research & Development in Material Science Pub Date : 2020-11-11 DOI: 10.31031/RDMS.2020.14.000837

S. Chkoundali, A. Aydi, F. Hlel

{"title":"Vibrational Analysis and Electrical Conduction Mechanism Investigations ofOrder Disorder Phase Transitions in [N(C3H7)4]2ZnBr4Compound","authors":"S. Chkoundali, A. Aydi, F. Hlel","doi":"10.31031/RDMS.2020.14.000837","DOIUrl":"https://doi.org/10.31031/RDMS.2020.14.000837","url":null,"abstract":"Organic-inorganic hybrid materials have attracted growing attention in recent research because they can combine specific properties of organic-inorganic frameworks including the formation of interactions [1]. In fact, regarding the nature (molecular, ionic, hydrogen bonding, etc...) of organic and inorganic components, many combinations may be achieved to elaborate the interesting materials with special physical properties in several fields of new scientific materials, such as nonlinear optical, electronic, magnetic [2]. These materials have recently attracted further interest due to their attractive potential for application [3]. More particularly, the hybrids compounds of the general formula A2MX4, where A is the alkylammonium group, M a divalent metal and X a halogen, has received much attention due to the presence of several phase transitions related to the re-orientation of the cationic parts [4-10].Taking these aspects into account and as an extension of our previous studies on organic-inorganic hybrid materials, herein, we have successfully synthesized the bis-te trapropylammoniumtetrabromozincate compound. Structurally, at room temperature, [N(C3H7)4]2ZnBr4 crystals are monoclinic system (Space group C2/c) with the following unit cell parameters: a=33.145(5) Å, b=14.234(3) Å, c=15.081(2) Å, β=110.207(5)°. The atomic arrangement can be described by an alternation of organic and inorganic layers along the [100] direction, which are made up of [N(C3H7)4] and [ZnBr4]2 atom (Figure 1). The inorganic groups are located in the (100) plane at a=1/8 and 3/8 sandwiched between two different organic sheets [11]. In fact, the objective of this paper is to study the Raman scattering and electric propriety in order to investigate the phase transition for this compound. Crimson Publishers Wings to the Research Research Article","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85653119","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

Comments on the Basis of Wave Mechanics 浅谈波动力学的基础

Research & Development in Material Science Pub Date : 2020-11-10 DOI: 10.31031/RDMS.2020.14.000835

M. A. Farouk

引用次数: 0

A Universally Defined Standard to Evaluate the Mechanical Stability of Microtextured Surfaces is Necessitated 需要一个统一的标准来评价微织构表面的机械稳定性

Research & Development in Material Science Pub Date : 2020-10-15 DOI: 10.31031/rdms.2020.14.000832

Huichao Jin

{"title":"A Universally Defined Standard to Evaluate the Mechanical Stability of Microtextured Surfaces is Necessitated","authors":"Huichao Jin","doi":"10.31031/rdms.2020.14.000832","DOIUrl":"https://doi.org/10.31031/rdms.2020.14.000832","url":null,"abstract":"The poor mechanical stability of microtextured surfaces is a major barrier to their engineering applications [1,2]. Accordingly, researchers have devoted themselves to developing microtextured surfaces with robust mechanical stability. Recently, Wu et al. [3] reported a superhydrophobic coating with a robust hierarchical structure and compared its mechanical stability to that of the other robust surfaces. The authors claimed that the test conditions used to evaluate the mechanical properties were the most rigorous as compared to those used in previously reported tests. As there is no universal standard to quantify the mechanical stability of a surface, the following questions are worth discussing: “how was the comparison carried out?” and “what test conditions qualify as rigorous?” Currently, several methods have been widely used to evaluate the mechanical stability of microtextured surfaces, including sandpaper abrasion, blade scraping, finger wiping, tape peeling, and sand impact. After these tests are performed, researchers usually use the changes in the Water Contact Angle (WCA) to evaluate the mechanical stability of microtextured the specific testing are many and varied the parameters parameter easier practices it difficult to compare the mechanical property of a microtextured surface with other robust surfaces.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76297356","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

A Review on the Functionality of Nanomaterials in 2d and 3d Additive Manufacturing 纳米材料在二维和三维增材制造中的功能研究进展

Research & Development in Material Science Pub Date : 2020-10-15 DOI: 10.31031/rdms.2020.14.000833

M. Petousis

{"title":"A Review on the Functionality of Nanomaterials in 2d and 3d Additive Manufacturing","authors":"M. Petousis","doi":"10.31031/rdms.2020.14.000833","DOIUrl":"https://doi.org/10.31031/rdms.2020.14.000833","url":null,"abstract":"Additive manufacturing (AM) is a process based on the sequential addition of material layers, allowing thus to print either 2D parts (thin or thick films substrate assisted and obtained then as self-standing films or supporting films/ coatings) or bulk 3D parts consisting of different materials with variable physical and chemical properties. The Global sales in 3D printing (products and services) rose by 21% from 2017, reaching 7B$ in 2018. Various techniques are available and belong to the family of 3D printing of solid materials, while the most well-known ones are the electron beam freeform fabrication, the direct metal laser sintering, and the fused filament fabrication (FFF). Due to the unique possibility to manufacture complex 3D objects layer by layer, as well as due to the relatively low-cost 3D printers available in the market nowadays, AM utilising nanomaterials could be employed in new ways toward greater control over material properties across part dimensions. The multifunctionality endowed through nanomaterials’ incorporation as additives can further extend capabilities of nanocomposites to i.e. by-design and patient specific biomedical equipment and personalised medicine applications, tuned and tailored gradients in electrical and thermal conductivity, increased strength and reduced weight, photonic emissions tunable for wavelength, etc., all of which are elaborated in this mini review article. In specific, FFF 3D printing method that a main focus is given herein could allow direct 3D printing of nano enabled thermoplastic filaments endowing the nanocomposite’s functionality to the bulk 3D printed derived objects.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75431250","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

Performance of Brewery Digestate as a Potential Water Substitute in Concrete Applications 啤酒消化液在混凝土中作为潜在水替代品的性能

Research & Development in Material Science Pub Date : 2020-09-18 DOI: 10.31031/RDMS.2020.14.000830

A. Ahmed, G. Hurst, M. Peeters, S. Tedesco

{"title":"Performance of Brewery Digestate as a Potential Water Substitute in Concrete Applications","authors":"A. Ahmed, G. Hurst, M. Peeters, S. Tedesco","doi":"10.31031/RDMS.2020.14.000830","DOIUrl":"https://doi.org/10.31031/RDMS.2020.14.000830","url":null,"abstract":"Concrete is one of the most utilised materials in the world. It is used to construct buildings, bridges and highways and is comprised of four key ingredients: cement, sand, gravel, and water. Although, there are environmental implications regarding the use of concrete, e.g. high embodied CO2, it is a flexible material in that it is possible to incorporate waste materials whilst maintaining structural integrity. Very little work has been done in replacing or partially substituting water as the hydration of cement is a key reaction to strength development. This paper investigates the possibility of utilising wastewater sludge (WWS) from the brewery industry as a water substitute in concrete. With the adverse effects of climate change resulting in water shortages around the world, there are sustainable implications of finding water substitutes. Experiments were carried out by supplementing water by volume in concrete mixes with WWS at 25%, 50%, and 100% steps at the point of need. Results were compared with a control specimen, which was made with 100% pure water. The results showed impressive compressive strengths that were suitable for structural applications, even at 100% WWS content. The results showed good repeatability and highlight the potential of WWS as a water replacement, which could enhance the sustainability aspect of concrete.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80988735","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

Utilization of Nano-Grain Size Particles of Natural Perlite Rock in Blended Cement-Part II: Durability Against Sulfate Attack 天然珍珠岩纳米颗粒在水泥中的应用——第二部分:抗硫酸盐侵蚀耐久性

Research & Development in Material Science Pub Date : 2020-09-18 DOI: 10.31031/rdms.2020.14.000831

Darweesh Hhm

{"title":"Utilization of Nano-Grain Size Particles of Natural Perlite Rock in Blended Cement-Part II: Durability Against Sulfate Attack","authors":"Darweesh Hhm","doi":"10.31031/rdms.2020.14.000831","DOIUrl":"https://doi.org/10.31031/rdms.2020.14.000831","url":null,"abstract":"The chemical resistance or durability of Portland cement pastes (PS0) incorporating natural Perlite rock (PT) against the aggressive attack of 4% MgSO4 solution up to 12 months were investigated. Results showed that water of consistency and setting times (initial and final) are elongated. The compressive strength slightly improved during the early ages of immersion only up to three months with the blank cement batch (Pp0), but up to 4, 5, 6 and 7 months with cement batches (Pp1-Pp4) containing 5, 10, 15 and 20wt%PT, respectively and then decreased. Thereafter, certain deleterious or detrimental reactions started till forming high levels of ettringite and/or gypsum. These new phases are responsible for the decrease of compressive strength. Both combined water and total sulfate contents increased with time of immersion up to 12 months but decreased with PT content if compared with those of the blank (Pp0). The blank cement pastes (Pp0) recorded the highest values of total sulfate content, i.e. it is very sensitive to SO42- ions. At the end of the 12th month of immersion, the SO42- ions only precipitated on the external and lateral surfaces of the hardened cement pastes, and some horizontal minor cracks and little deformation could be seen on the edges of specimens with samples containing PT, whilst large swelling was noted with cement pastes of the blank (Pp0).","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77464272","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

Test of Surface Roughness for Bipolar plates for Vanadium Redox Flow Batteries and Biological Fuel cells 钒氧化还原液流电池和生物燃料电池双极板表面粗糙度测试

Research & Development in Material Science Pub Date : 2020-09-15 DOI: 10.31031/rdms.2020.14.000829

T. Hickmann

引用次数: 0

Challenges of Renewable Energy Sources (RES) in Developing Countries and the Way Forward 发展中国家可再生能源的挑战及未来之路

Research & Development in Material Science Pub Date : 2020-09-14 DOI: 10.31031/rdms.2020.14.000828

O. Eseosa

引用次数: 0