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Zbigniew Pater, Janusz Tomczak, Tomasz Bulzak
The paper describes an innovative cross rolling method that enables the production of six balls at the same time, each ball with a diameter of 100 mm. The principle of the proposed rolling technique is discussed and the tools used in this forming process are described. Two variations of the proposed method for producing balls were investigated, one performed with the use of flat tools and the other with the use of two rolls. Results of the numerical modelling are discussed. They clearly demonstrate that the proposed method can be used to produce balls with large diameters...
September 21, 2018: Materials
Zikun Chen, Bo Wang, Xiaoshuang Li, Dayu Huang, Hongyang Sun, Qingguang Zeng
In this work, an aluminate silicate garnet phosphor, Y₂Mg₂Al₂Si₂O12 :Ce3+ (YMASG:Ce3+ ), exhibiting strong and broad yellow-orange emission, was successfully synthesized. Attributed to the double cation substitution of YAG:Ce3+ , which led to a compression effect, a redshift was observed with respect to YAG:Ce3+ . More importantly, a transparent phosphor-in-glass (PiG) sample was obtained by incorporating the phosphor YMASG:Ce3+ into a special low-melting precursor glass. The energy dispersive spectrometer (EDS) mapping analysis of the as-prepared PiG sample indicates that YMASG:Ce3+ was successfully incorporated into the glass host, and its powders were uniformly distributed in glass...
September 21, 2018: Materials
Jingyang Wang, Xiantao Wang, Jun Yan, Qi Tan, Guijie Liang, Shaohua Qu, Zhicheng Zhong
A novel Ti3+ self-doped branched rutile TiO₂ nanorod arrays (NRAs) was successfully grown on an F-doped tin oxide (FTO) transparent conductive glass by a combined hydrothermal and magnetron sputtering method. Surface morphology, structure, optical properties, and photoelectrochemical behavior of the branched TiO₂ NRAs are determined. Using TiO₂ nanoparticles (NPs) deposited on the top of the nanorods as seeds, TiO₂ nanobranches can easily grow on the top of the nanorods. Moreover, the Ti3+ defects in the TiO₂ NPs and associated oxygen vacancies, and the nanobranches expend the optical absorption edge of the TiO₂ NRAs from 400 nm to 510 nm...
September 20, 2018: Materials
Patricia Gómez, Daniel Elduque, Carmelo Pina, Carlos Javierre
The aim of this paper is to analyze the influence of the composition on the environmental impact of the two main types of soft ferrites, allowing scientists and engineers to compare them based not only on cost and properties, but also on an environmental point of view. Iron oxides are the basis of soft ferrites, but these ferrites have a wide range of compositions, using materials such as manganese or nickel, which affect their magnetic properties, but also modify the environmental impact. A Life Cycle Assessment has been carried out for manganese‒zinc (MnZn) and nickel‒zinc (NiZn) soft ferrites, with a Monte Carlo approach to assess multiple compositions...
September 20, 2018: Materials
Mohamed Zekri, Andreas Erlebach, Andreas Herrmann, Kamel Damak, Christian Rüssel, Marek Sierka, Ramzi Maâlej
The medium-range atomic structure of magnesium and barium aluminosilicate glasses doped with Gd₂O₃ as a model rare earth oxide is elucidated using molecular dynamics simulations. Our structure models rationalize the strong dependence of the luminescence properties of the glasses on their chemical composition. The simulation procedure used samples' atomic configurations, the so-called inherent structures, characterizing configurations of the liquid state slightly above the glass transition temperature. This yields medium-range atomic structures of network former and modifier ions in good agreement with structure predictions using standard simulated annealing procedures...
September 20, 2018: Materials
Karla Gutierrez Z-B, Patricia G Zayas-Bazán, Osvaldo de Melo, Francisco de Moure-Flores, José A Andraca-Adame, Luis A Moreno-Ruiz, Hugo Martínez-Gutiérrez, Salvador Gallardo, Jorge Sastré-Hernández, Gerardo Contreras-Puente
The preparation of ultra-thin semi-transparent solar cells with potential applications in windows or transparent roofs entails several challenges due to the very small thickness of the layers involved. In particular, problems related to undesired inter-diffusion or inhomogeneities originated by incomplete coverage of the growing surfaces must be prevented. In this paper, undoped SnO₂, CdS, and CdTe thin films with thickness suitable for use in ultra-thin solar cells were deposited with a radiofrequency (RF) magnetron sputtering technique onto conductive glass...
September 20, 2018: Materials
Mengda Xu, Jie Liu, Xiankui Xu, Shanhu Liu, František Peterka, Yanrong Ren, Xianfeng Zhu
Silver nanoparticles synthesized with polymers as coating agents is an effective method to overcome their poor stability and aggregation in solution. Silver-polyethylene glycol (Ag-PEG) nanoparticles were synthesized with the thiol-functionalized polyethylene glycol (SH-PEA) as the coating, reducing and stabilizing agent. The UV irradiation time, polymer and silver nitrate concentration for the synthesis were investigated. The concentration of silver nitrate had significant effect on the morphology of Ag-PEG nanoparticles...
September 20, 2018: Materials
Filip Stojceveski, Andreas Hendlmeier, James D Randall, Chantelle L Arnold, Melissa K Stanfield, Daniel J Eyckens, Richard Alexander, Luke C Henderson
Testing methodologies to accurately quantify interfacial shear strength (IFSS) are essential in order to understand fiber-matrix adhesion. While testing methods at a microscale (single filament fragmentation test-SFFT) and macroscale (Short Beam Shear-SBS) are wide spread, each have their own shortcomings. The Iosipescu (V-notch) tow test offers a mesoscale bridge between the microscale and macroscale whilst providing simple, accurate results with minimal time investment. However, the lack of investigations exploring testing variables has limited the application of Iosipescu testing to only a handful of studies...
September 19, 2018: Materials
Huizhen Ke, Yonggui Li
In this paper, innovative capric⁻palmitic⁻stearic acid ternary eutectic/polyacrylonitrile/aluminum oxide (CA⁻PA⁻SA/PAN/Al₂O₃) form-stable phase change composite fibrous membranes (PCCFMs) with different mass ratios of Al₂O₃ nanoparticles were prepared for thermal energy storage. The influences of Al₂O₃ nanoparticles on morphology and thermal performances of the form-stable PCCFMs were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and measurement of melting and freezing times, respectively...
September 19, 2018: Materials
Zhihong Yang, Nan Chen, Xiaomei Qin
The gelcasting method is usually employed to fabricate relatively dense ceramics. In this work, however, porous Al₂O₃ ceramics with submicron-sized pores were fabricated using the water-based gelcasting method by keeping the Al₂O₃ content at low levels. By controlling the water content in the ceramic slurries and the sintering temperature of the green samples, the volume fractions and the size characteristics of the pores in the porous Al₂O₃ can be readily obtained. For the porous Al₂O₃ ceramics prepared with 30 vol...
September 19, 2018: Materials
Ignacio A Fernández-Coppel, Pablo Martín-Ramos, Jesús Martín-Gil, Ramón Pamies, Manuel Avella, María Dolores Avilés
Molybdenum chalcogenides present interesting properties beyond their superconducting critical temperatures and upper critical magnetic fields, making them suitable for potential applications in tribology, batteries, catalysis, or thermopower. In this study, Mo15 S19 nanoparticles with an average diameter of 10 nm were synthesized via the reaction of ammonium molybdate with hydrochloric acid and elemental sulfur as reducers at 245 °C. The oxidation to MoO₃ in air was efficiently avoided by using linseed oil as a reaction medium and dispersant...
September 19, 2018: Materials
Xuemin Li, Yinan Liu, Jianxiu Hao, Weihong Wang
A large amount of almond shells are disposed of every year. The anatomical and chemical characteristics of almond shells are investigated in this paper in order to contribute to better utilization of these shells. The micromorphology, surface elements, thermal stability, crystallization, chemical composition, and relative properties of almond shells are analyzed. Under observation by microscope and electron microscope, the diameter of almond shells is 300⁻500 μm for large holes, and 40⁻60 μm for small holes present in the shell...
September 19, 2018: Materials
Nasseem Salam, Sotiria Toumpaniari, Piergiorgio Gentile, Ana Marina Ferreira, Kenneth Dalgarno, Simon Partridge
Control of cell migration is fundamental to the performance of materials for cell delivery, as for cells to provide any therapeutic effect, they must migrate out from the delivery material. Here the influence of fibrinogen concentration on the migration of encapsulated human mesenchymal stem cells (hMSCs) from a cell spheroid through fibrin hydrogels is tracked over time. Fibrin was chosen as a model material as it is routinely employed as a haemostatic agent and more recently has been applied as a localised delivery vehicle for potential therapeutic cell populations...
September 19, 2018: Materials
Kun Yang, Bin Zhong, Qi Huang, Chao He, Zhi-Yong Huang, Qingyuan Wang, Yong-Jie Liu
Ultrasonic fatigue tests up to 1010 cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio ( R ) of -1 with smooth specimens and at R = -1, 0.1 and 0.5 with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused by multi-point surface crack initiation changes from crack propagation stage to crack initiation stage in the high cycle fatigue regime. Notch effect further promotes the degeneration of high cycle and very high cycle fatigue strength at R > -1...
September 19, 2018: Materials
Zhipeng Qu, Wei He, Mingyun Lv, Houdi Xiao
This paper reports the biaxial tensile mechanical properties of the envelope material through experimental and constitutive models. First, the biaxial tensile failure tests of the envelope material with different stress ratio in warp and weft directions are carried out. Then, based on fiber-reinforced continuum mechanics theory, an anisotropic hyperelastic constitutive model on envelope material with different stress ratio is developed. A strain energy function that characterizes the anisotropic behavior of the envelope material is decomposed into three parts: fiber, matrix and fiber⁻fiber interaction...
September 19, 2018: Materials
Sapia Murgolo, Irina S Moreira, Clara Piccirillo, Paula M L Castro, Gianrocco Ventrella, Claudio Cocozza, Giuseppe Mascolo
Diclofenac (DCF) is one of the most detected pharmaceuticals in environmental water matrices and is known to be recalcitrant to conventional wastewater treatment plants. In this study, degradation of DCF was performed in water by photolysis and photocatalysis using a new synthetized photocatalyst based on hydroxyapatite and TiO₂ (HApTi). A degradation of 95% of the target compound was achieved in 24 h by a photocatalytic treatment employing the HApTi catalyst in comparison to only 60% removal by the photolytic process...
September 19, 2018: Materials
Ran Yang, Jiuba Wen, Yanjun Zhou, Kexing Song, Zhengcheng Song
The effects of aluminum on the mechanical properties and corrosion behavior in artificial seawater of Cu-Ni-Fe-Mn alloys were investigated. Cu-7Ni- x Al-1Fe-1Mn samples, consisting of 0, 1, 3, 5, and 7 wt % aluminum along with the same contents of other alloying elements (Ni, Fe, and Mn), were prepared. The microstructure of Cu-7Ni- x Al-1Fe-1Mn alloy was analyzed by Transmission Electron Microscopy (TEM), and its corrosion property was tested by an electrochemical system. The results show that the mechanical and corrosion properties of Cu-7Ni- x Al-1Fe-1Mn alloy have an obvious change with the aluminum content...
September 19, 2018: Materials
Wenhao Dai, Haifeng Dong, Xueji Zhang
Theranostic platforms integrating imaging diagnostic and therapeutic interventions into a single nanoplatform have attracted considerable attention for cancer-individualized therapies. However, their uncertain stability, complex pharmacokinetics, and intrinsic toxicology of multiple components hinder their practical application in clinical research. In this paper, stable and high-concentration molybdenum carbide quantum dots (Mo₂C QDs) with a diameter of approximately 6 nm and a topographic height of about 1...
September 19, 2018: Materials
Sung-Hwan Jang, Donghak Kim, Yong-Lae Park
Joule heating is useful for fast and reliable manufacturing of conductive composite materials. In this study, we investigated the influence of Joule heating on curing conditions and material properties of polymer-based conductive composite materials consisting of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS). We applied different voltages to the CNT nanocomposites to investigate their electrical stabilization, curing temperature, and curing time. The result showed that highly conductive CNT/PDMS composites were successfully cured by Joule heating with uniform and fast heat distribution...
September 19, 2018: Materials
Dongting Wang, Shangheng Liu, Mingfa Shao, Jinghan Zhao, Yukun Gu, Qiuyi Li, Xianxi Zhang, Jinsheng Zhao, Yuzhen Fang
Hierarchical SnO₂ nanocrystallites aggregates (NAs) were prepared with a simple room temperature⁻based aqueous solution method followed by simple freeze-drying treatment. The as-prepared SnO₂ NAs were subsequently combined with SnO₂ nanosheet⁻based structures from the viewpoint of a function-matching strategy, and under an optimized condition, a power conversion efficiency (PCE) of 5.59% was obtained for the resultant hybrid photoanode, a remarkable 60% enhancement compared to that of dye-sensitized solar cells (DSCs) fabricated with bare SnO₂ NAs architecture...
September 19, 2018: Materials
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