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https://www.readbyqxmd.com/read/28925963/on-the-role-of-processing-parameters-in-producing-recycled-aluminum-aa6061-based-metal-matrix-composite-mmc-alr-prepared-using-hot-press-forging-hpf-process
#1
Azlan Ahmad, Mohd Amri Lajis, Nur Kamilah Yusuf
Solid-state recycling, which involves the direct recycling of scrap metal into bulk material using severe plastic deformation, has emerged as a potential alternative to the conventional remelting and recycling techniques. Hot press forging has been identified as a sustainable direct recycling technique that has fewer steps and maintains excellent material performance. An experimental investigation was conducted to explore the hardness and density of a recycled aluminum-based metal matrix composite by varying operating temperature and holding time...
September 19, 2017: Materials
https://www.readbyqxmd.com/read/28915038/frustrated-lewis-pair-polymers-as-responsive-self-healing-gels
#2
Meng Wang, Fabio Nudelman, Rebecca Matthes, Michael Patrick Shaver
Steric bulk prevents the formation of strong bonds between Lewis acids and bases in Frustrated Lewis pairs (FLPs), where latent reactivity makes these reagents transformative in small molecule activations and metal-free catalysis. However, their use as a platform for developing materials chemistry is unexplored. Here we report a fully macromolecular FLP, built from linear copolymers that containing either a sterically encumbered Lewis base or Lewis acid as a pendant functional group. The target functional copolymers were prepared by a controlled radical copolymerization of styrene with designer boron or phosphorous containing monomers...
September 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28910148/bulk-scale-formulation-of-therapeutic-doses-of-clinical-grade-ready-to-use-177-lu-dota-tate-the-intricate-radiochemistry-aspects
#3
Anupam Mathur, Vrinda Prashant, Navin Sakhare, Sudipta Chakraborty, K V Vimalnath, Repaka Krishna Mohan, Chanda Arjun, Barkha Karkhanis, Ravi Seshan, Sandip Basu, Aruna Korde, Sharmila Banerjee, Ashutosh Dash, Satbir Singh Sachdev
INTRODUCTION: (177)Lu-DOTA-TATE is a clinically useful and promising therapeutic radiopharmaceutical for peptide receptor radionuclide therapy of neuroendocrine tumors (NETs) overexpressing somatostatin receptors. Currently, the radiopharmaceutical is prepared in-house at nuclear medicine centers, thereby restricting its use to limited centers only. In this article, the authors describe systematic studies toward bulk scale formulation of "ready-to-use" (177)Lu-DOTA-TATE using medium specific activity (177)Lu (740-1110 GBq/mg) at a centralized radiopharmacy facility...
September 2017: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/28902986/how-many-bulk-metallic-glasses-are-there
#4
Yanglin Li, Shaofan Zhao, Yanhui Liu, Pan Gong, Jan Schroers
Quantitative prediction of glass forming ability using a priori known parameters is highly desired in metallic glass development; however proven to be challenging due to the complexity of glass formation. Here we estimate the number of potential metallic glasses (MGs) and bulk metallic glasses (BMGs) forming systems and alloys, from empirically determined alloy design rules based on a priori known parameters. Specifically, we take into account atomic size ratio, heat of mixing, and liquidus temperature, which we quantify on binary glasses and centimeter-sized BMGs...
September 13, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28891945/optical-characterization-of-nano-and-microcrystals-of-eupo%C3%A2-created-by-one-step-synthesis-of-antimony-germanate-silicate-glass-modified-by-p%C3%A2-o%C3%A2
#5
Jacek Zmojda, Marcin Kochanowicz, Piotr Miluski, Agata Baranowska, Wojciech A Pisarski, Joanna Pisarska, Renata Jadach, Maciej Sitarz, Dominik Dorosz
Technology of active glass-ceramics (GC) is an important part of luminescent materials engineering. The classic method to obtain GC is based on annealing of parent glass in proper temperature and different time periods. Generally, only the bulk materials are investigated as a starting host for further applications. However, the effect of an additional heat-treatment process on emission and structural properties during GC processing is omitted. Here, we focus on the possibility of obtaining transparent glass-ceramic doped with europium ions directly with a melt-quenching method...
September 9, 2017: Materials
https://www.readbyqxmd.com/read/28884765/enhancement-in-thermoelectric-performance-of-sige-nanoalloys-dispersed-with-sic-nanoparticles
#6
Sivaiah Bathula, M Jayasimhadri, Bhasker Gahtori, Anil Kumar, A K Srivastava, Ajay Dhar
SiGe is one of the most widely used thermoelectric materials for radioisotope thermoelectric generator applications for harnessing waste-heat at high temperatures. In the present study, we report a simple experimental strategy for enhancing the thermoelectric and mechanical properties of n-type SiGe nanoalloys by dispersing SiC nanoparticles in a SiGe nanoalloy matrix. This strategy yielded a high value of figure-of-merit (ZT) of ∼1.7 at 900 °C in the SiGe/SiC nanocomposite, which is nearly twice that reported for its pristine bulk counterpart and ∼15% higher than that of pristine SiGe nanoalloys...
September 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28875192/phase-separation-and-physico-chemical-processes-at-microscopic-and-macroscopic-levels-in-mwcnt-laden-polymer-blends-using-a-unique-droplet-based-architecture
#7
Binita Pathak, Goutam Prasanna Kar, Suryasarathi Bose, Saptarshi Basu
We propose a unique contact-free droplet based architecture in which thermally induced instabilities can be used to precisely alter the phase separation behavior in a dynamically asymmetric polymer blend (solution of PS/PVME in toluene) by controlling the external heating rates and concentration of added nanoparticles (multi-walled carbon nanotube particles, MWCNTs). In addition, by tuning the heating rates, distinctly different macroscopic morphologies (hollow shell or globular mass) can be obtained as a final structure in such droplets...
September 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28858249/thermal-conductivity-of-a-nanoscale-yttrium-iron-garnet-thin-film-prepared-by-the-sol-gel-process
#8
Yun Young Kim
The thermal conductivity of a nanoscale yttrium iron garnet (Y₃Fe₅O12, YIG) thin-film prepared by a sol-gel method was evaluated using the ultrafast pump-probe technique in the present study. The thermoreflectance change on the surface of a 250 nm thick YIG film, induced by the irradiation of femtosecond laser pulses, was measured, and curve fitting of a numerical solution for the transient heat conduction equation to the experimental data was performed using the finite difference method in order to extract the thermal property...
August 31, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28854749/a-comparative-study-of-functional-properties-of-normal-and-wooden-breast-broiler-chicken-meat-with-nacl-addition
#9
Tong Xing, Xue Zhao, Minyi Han, Linlin Cai, Shaolin Deng, Guanghong Zhou, Xinglian Xu
The selection of broilers for augmented growth rate and breast has brought about wooden-breast (WB) muscle abnormalities, which caused substantial economic losses. The objective of this study was to compare water holding capacity, water mobility and distribution, salt-soluble protein (SSP) content, and protein profiles of normal and WB chicken meat with different additions of NaCl. Thirty WB and 30 normal chicken breasts were selected from a deboning line of a major Chinese processing plant at 2 to 3 h post mortem...
September 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28852113/precipitation-phenomena-in-al-zn-mg-alloy-matrix-composites-reinforced-with-b4c-particles
#10
Chuandong Wu, Kaka Ma, Dalong Zhang, Jialu Wu, Shuya Xiong, Guoqiang Luo, Jian Zhang, Fei Chen, Qiang Shen, Lianmeng Zhang, Enrique J Lavernia
To provide insight into precipitation phenomena in age-hardening Al-Zn-Mg(-Cu) matrix composites, an Al 7075 alloy composite reinforced with B4C particles was selected as a model system. The bulk composites were fabricated via plasma activated sintering and followed by a peak aged (T6) heat treatment. Two types of Al matrix zones were identified in the composite: (1) the regions in the vicinity of the matrix/reinforcement interface, defined as "matrix plastic zone" (MPZ) hereafter, and (2) the regions away from the matrix/reinforcement interface, simply defined as matrix hereafter...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28846861/wildfire-effects-on-lipid-composition-and-hydrophobicity-of-bulk-soil-and-soil-size-fractions-under-quercus-suber-cover-sw-spain
#11
Nicasio T Jiménez-Morillo, Jorge E Spangenberg, Ana Z Miller, Antonio Jordán, Lorena M Zavala, Francisco J González-Vila, José A González-Pérez
Soil water repellency (hydrophobicity) prevents water from wetting or infiltrating soils, triggering changes in the ecosystems. Fire may develop, enhance or destroy hydrophobicity in previously wettable or water-repellent soils. Soil water repellency is mostly influenced by the quality and quantity of soil organic matter, particularly the lipid fraction. Here we report the results of a study on the effect of fire on the distribution of soil lipids and their role in the hydrophobicity grade of six particle size fractions (2-1, 1-0...
August 25, 2017: Environmental Research
https://www.readbyqxmd.com/read/28839188/a-comparative-study-of-the-mechanical-and-thermal-properties-of-defective-zrc-tic-and-sic
#12
M Jiang, J W Zheng, H Y Xiao, Z J Liu, X T Zu
ZrC and TiC have been proposed to be alternatives to SiC as fuel-cladding and structural materials in nuclear reactors due to their strong radiation tolerance and high thermal conductivity at high temperatures. To unravel how the presence of defects affects the thermo-physical properties under irradiation, first-principles calculations based on density function theory were carried out to investigate the mechanical and thermal properties of defective ZrC, TiC and SiC. As compared with the defective SiC, the ZrC and TiC always exhibit larger bulk modulus, smaller changes in the Young's and shear moduli, as well as better ductility...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28832043/plasmonic-heating-from-indium-nanoparticles-on-a-floating-microporous-membrane-for-enhanced-solar-seawater-desalination
#13
Lulu Zhang, Jun Xing, Xinglin Wen, Jianwei Chai, Shijie Wang, Qihua Xiong
Passive solar evaporation represents a promising and environmentally benign method of water purification/desalination. Plasmonic nanoparticles have been demonstrated as an effective approach for enhancing solar steam generation through a plasmonic heating effect, nonetheless the efficiency is constrained by unnecessary bulk heating of the entire liquid volume, while the noble metals commonly used are not cost-effective in terms of availability and their sophisticated preparation. Herein, a paper-like plasmonic device consisting of a microporous membrane and indium nanoparticles (In NPs/MPM) is fabricated through a simple thermal evaporation method...
September 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28831730/re-examining-the-procedure-for-simulating-polymer-tg-using-molecular-dynamics
#14
Chaofu Wu
In this work, the poly(ethylene oxide) bulk as one example has been iteratively heated and cooled back using MD simulations to examine the effects of thermal history on the resulting Tg. It is demonstrated that, after the system is equilibrated once at the high temperatures, the simulated Tg does not exhibit a systematical shift with the thermal history, and the averaged Tg compares well with that for the single procedure, that is, adequately equilibrating at the highest temperature and cooling with the same rate to the lowest temperature...
August 22, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28831044/synthesis-of-quenchable-amorphous-diamond
#15
Zhidan Zeng, Liuxiang Yang, Qiaoshi Zeng, Hongbo Lou, Hongwei Sheng, Jianguo Wen, Dean J Miller, Yue Meng, Wenge Yang, Wendy L Mao, Ho-Kwang Mao
Diamond owes its unique mechanical, thermal, optical, electrical, chemical, and biocompatible materials properties to its complete sp (3)-carbon network bonding. Crystallinity is another major controlling factor for materials properties. Although other Group-14 elements silicon and germanium have complementary crystalline and amorphous forms consisting of purely sp (3) bonds, purely sp (3)-bonded tetrahedral amorphous carbon has not yet been obtained. In this letter, we combine high pressure and in situ laser heating techniques to convert glassy carbon into "quenchable amorphous diamond", and recover it to ambient conditions...
August 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28830162/communication-surface-facilitated-softening-of-ordinary-and-vapor-deposited-glasses
#16
Ulyana Cubeta, Deepanjan Bhattacharya, Vlad Sadtchenko
A common distinction between the ordinary glasses formed by melt cooling and the stable amorphous films formed by vapor deposition is the apparent mechanism of their devitrification. Using quasi-adiabatic, fast scanning calorimetry that is capable of heating rates in excess of 10(5) K s(-1), we have investigated the softening kinetics of micrometer-scale, ordinary glass films of methylbenzene and 2-propanol. At the limit of high heating rates, the transformation mechanism of ordinary glasses is identical to that of their stable vapor-deposited counterparts...
August 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28819170/self-shedding-and-sweeping-of-condensate-on-composite-nano-surface-under-external-force-field-enhancement-mechanism-for-dropwise-and-filmwise-condensation-modes
#17
Jie Sun, Hua Sheng Wang
In this work, we propose the concept to use the hydrophilic or neutral surface for condensation heat transfer and to use the superhydrophobic surface for enhancement by self-shedding and sweeping of condensate. Molecular dynamics simulation results show that no matter the vapor condenses on the solid surface in dropwise or filmwise mode, the grown-up condensate self-sheds and falls off the superhydrophobic surface, sweeping the growing condensate on the condensing surface downstream. We characterize the dynamics of condensate that the continuous self-shedding and sweeping effectively remove the droplets from the solid surface in dropwise mode or thin the condensate film on the solid surface in filmwise mode, which significantly enhances the condensation heat transfer...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28816435/fiber-based-double-sided-reduced-graphene-oxide-films-for-efficient-solar-vapor-generation
#18
Ankang Guo, Xin Ming, Yang Fu, Gang Wang, Xianbao Wang
Solar vapor generation is a promising and whole new branch of photothermal conversion for harvesting solar energy. Various materials and devices for solar thermal conversion were successively produced and reported for higher solar energy utilization in the past few years. Herein, a compact device of reduced graphene oxides (rGO) and paper fibers was designed and assembled for efficient solar steam generation under light illumination, and it consists of water supply pipelines (WSP), a thermal insulator (TI) and a double-sided absorbing film (DSF)...
August 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28813006/samarium-monosulfide-sms-reviewing-properties-and-applications
#19
REVIEW
Andreas Sousanis, Philippe F Smet, Dirk Poelman
In this review, we give an overview of the properties and applications of samarium monosulfide, SmS, which has gained considerable interest as a switchable material. It shows a pressure-induced phase transition from the semiconducting to the metallic state by polishing, and it switches back to the semiconducting state by heating. The material also shows a magnetic transition, from the paramagnetic state to an antiferromagnetically ordered state. The switching behavior between the semiconducting and metallic states could be exploited in several applications, such as high density optical storage and memory materials, thermovoltaic devices, infrared sensors and more...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28806068/in-situ-atomic-scale-studies-of-the-formation-of-epitaxial-pt-nanocrystals-on-monolayer-molybdenum-disulfide
#20
Shanshan Wang, Hidetaka Sawada, Qu Chen, Grace G D Han, Christopher Allen, Angus I Kirkland, Jamie H Warner
Pt-nanocrystal:MoS2 hybrid materials have promising catalytic properties for hydrogen evolution, and understanding their detailed structures at the atomic scale is crucial to further development. Here, we use an in situ heating holder in an aberration-corrected transmission electron microscope to study the formation of Pt nanocrystals directly on the surface of monolayer MoS2 from a precursor on heating to 800 °C. Isolated single Pt atoms and small nanoclusters are observed after in situ heating, with two types of preferential alignment between the Pt nanocrystals and the underlying monolayer MoS2...
August 14, 2017: ACS Nano
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