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作者： Plucknett, Kevin P. Munro, Cameron D. Materials Engineering Program Department of Process Engineering and Applied Science 1360 Barrington Street Halifax NS B3H 4X2 Canada Halifax NS B3H 4X2 Canada

Ferroelectric ceramics have a wide range of industrial applications. While components can be formed through simple 'press and sinter' approaches, there is an increasing need for more flexible processing methods. Suspension based forming promotes greater homogeneity, through elimination of processing defects, and allows the formation of more complex shaped components. In the present work, the application of aqueous gel casting technologies is reviewed, and in particular the use of natural biopolymers as gelation aids for such approaches. Recent studies of the application of such technology to complex shape forming of baTiO3 ferroelectric ceramics are examined. Emphasis is placed upon a simple subtractive rapid prototyping method, utilizing aqueous gel casting in combination with green machining. Aqueous gel casting of ferroelectric ceramics is investigated, using agar as a gelling aid. Combining high-solids content baTiO3 suspensions (55vol%), with concentrated agar solutions (up to 8wt%), allows casting of components with high green densities (and final agar concentrations up to 1wt% of the solids loading), which can be subsequently green-machined. Fine scale features (≈300μm thick), with high aspect ratios (up to 13:1), are successfully fabricated. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Aspect ratio

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High fluorescent carbon dots/Ag as a sensitive sensor for tetracycline waste in aqueous solution 10

High fluorescent carbon dots/Ag as a sensitive sensor for te...

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10th International Seminar on New Paradigm and Innovation of Natural sciences and itsApplication, ISNPINSA 2020

作者： Alkian, I. Sutanto, H. Hadiyanto, H. Hidayanto, E. Hapsari, H.P. Wibowo, A.A. Syahida, A.N. Irianti, F.D.D. Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Departemen of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia Departemen of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Smart Materials Research Center Laboratory Diponegoro University Semarang Indonesia

Currently, antibiotics waste produced by hospitals and pharmacies is increasing, increasing demand and public consumption. Tetracyclines are a popular type of antibiotic that can pollute the environment even in low concentrations. This study aimed to detect tetracyclines in an aqueous environment using C-dots/Ag. C-dots material was synthesized by microwave radiation method with the addition of Ag 0-4 %. C-dots/Ag is produced in the form of a brown-black powder that glows green. FTIR testing shows that C-dots/Ag contains various functional groups O-H, N-H, C-H, C=O, and C=C. The surface morphology of the C-dots based on SEM testing is round and rough. Ag's addition causes C-dots' surface morphology to agglomerate, shifting the C-dots' absorbance peaks towards a larger wavelength and decreasing the energy bandgap. C-dots/Ag 2% has the best optical properties based on the intensity of the resulting fluency. In general, C-dots/Ag has excellent potential to be a susceptible, selective, and effective tetracycline detection agent. © Published under licence by IOP Publishing Ltd.

关键词： Surface morphology

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Europium-doped Pyrochlores for Use as Thermographic Phosphors in Thermal barrier Coatings

Europium-doped Pyrochlores for Use as Thermographic Phosphor...

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作者： Desai, Saunak K. Hansel, Rachael A. Pitz, Robert W. Walker, D. Greg Department of Mechanical Engineering Vanderbilt University VU Station B 351592 Nashville TN 37235 United States Interdisciplinary Materials Science Program Vanderbilt University Nashville TN 37235 United States

ISBN: (纸本)9781600867392

Three europium-doped pyrochlores including La2Zr 2O7:Eu, La2Hf2O7:Eu, and Nd2Zr2O7:Eu were tested to determine their lifetimes as a function of temperature. These pyrochlores were examined to determine their suitability as thermographic phosphors, in systems that use these materials for thermal barrier coatings. Results show that La 2Hf2O7:Eu and La2Zr 2O7:Eu can be used to measure surface temperatures up to approximately 600° C and 800° C, respectively. However, Nd 2Zr2O7:Eu showed little propensity for use as a thermographic phosphor. Copyright © 2010 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Phosphors

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Electroless nickel phosphorus plating on carbon steel

Electroless nickel phosphorus plating on carbon steel

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materials science and Technology Conference and Exhibition 2013, MS and T 2013

作者： Lin, Cui Dadvand, Nazila Farhat, Zoheir Kipouros, Georges J. Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University 1360 Barrington Street Halifax NS B3H 4R2 Canada School of Material Science and Engineering Nanchang Hangkong University 696 Fenghenan Road Nanchang Jiangxi 330063 China

ISBN: (纸本)9781629933092

Electroless nickel-phosphorus coatings are important for corrosion and wear protection. The preparation of electroless nickel-phosphorus coating on carbon steel substrate in an ammonia free friendly bath consisting of Nichem 1125-2A 75g/L and Nichem 1125-2b 230g/L at a temperature of 89°C and pH of 4.8 for 90 minutes was studied. Optical microscopy(OM), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD) were utilized to characterize the deposits. A nanoindentation system and a dry reciprocating wear test were used to investigate microhardness and wear resistance, respectively. A homogeneous coating with good adherence was produced. Structural characterization suggests that the deposited Ni-P coating has an amorphous structure with 9-11 wt.% phosphorus content. The micro-hardness of Ni-P coating is more than twofold that of substrate, indicating the coating can improve the hardness of carbon steel. The wear rates and steady state friction coefficients of Ni-P coating and carbon steel are 4.77×10 -2 mg/m, 0.37 and 5.63×10-2 mg/m, 0.51, respectively, at a load of 6N under dry sliding condition, This reveals that the Ni-P coating can offer better wear resistance compared to carbon steel. Copyright © 2013 MS&T'13®.

关键词： Wear resistance

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Challenges for and Pathways toward Li-Metalbased All-Solid-State batteries

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ACS ENERGY LETTERS 2021年第4期6卷 1399-1404页

作者： Albertus, Paul Anandan, Venkataramani ban, Chunmei balsara, Nitash belharouak, Ilias buettner-Garrett, Josh Chen, Zonghai Daniel, Claus Doeff, Marca Dudney, Nancy J. Dunn, bruce Harris, Stephen J. Herle, Subramanya Herbert, Eric Kalnaus, Sergiy Libera, Joesph A. Lu, Dongping Martin, Steve McCloskey, bryan D. McDowell, Matthew T. Meng, Y. Shirley Nanda, Jagjit Sakamoto, Jeff Self, Ethan C. Tepavcevic, Sanja Wachsman, Eric Wang, Chunsheng Westover, Andrew S. Xiao, Jie Yersak, Thomas Department of Chemical and Biomolecular Engineering University of Maryland College Park Maryland 20742 United States Ford Motor Company Dearborn Michigan 48121 United States Mechanical Engineering Department University of Colorado Boulder Colorado 80309 United States Department of Chemical and Biomolecular Engineering and Lawrence Berkeley National Laboratory Materials Sciences Division University of California Berkeley California 94720 United States Energy and Transportation Science Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 United States Solid Power Inc. Louisville Colorado 80027 United States Chemical Sciences and Engineering Division Argonne National Laboratory 9700 South Cass Avenue Argonne Illinois 60439 United States Lawrence Berkeley National Laboratory Energy Storage and Distributed Resources Division University of California Berkeley California 94720 United States Department of Materials Science and Engineering University of California Los Angeles California 90095 United States Applied Materials Inc. 3225 Oakmead Village Drive B12_2F6 Santa Clara California 95054 United States Department of Materials Science and Engineering Michigan Technological University Houghton Michigan 49931 United States Energy and Environmental Directorate Pacific Northwest National Laboratory Richland Washington 99352 United States Department of Materials Science & Engineering Iowa State University of Science & Technology Ames Iowa 50011 United States Woodruff School of Mechanical Engineering and School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States Department of NanoEngineering and Materials Science and Engineering Program University of California San Diego La Jolla California 92093 United States Department of Materials Science and Engineering and Department of Mechanical Engineering University of Michigan Ann Arbor Michigan 48109 United States Chemical and Materials Systems Laborat

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Characterization of ZnAl2O4 spinel obtained by hydrothermal and microwave assisted combustion method: A comparative study

Characterization of ZnAl2O4 spinel obtained by hydrothermal ...

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作者： De Macedo, Heloísa Pimenta De Araújo Medeiros, Rodolfo Luíz bezerra De Medeiros, Amanda Lucena De Oliveira, Ângelo Anderson Silva De Figueredo, Gilvan Pereira De Freitas Melo, Marcus Antônio De Araújo Melo, Dulce Maria Postgraduate Program in Science and Engineering of Materials Federal University of Rio Grande do Norte - UFRN Natal RNCEP 59078-970 Brazil Postgraduate Program in Science and Engineering of Petroleum Federal University of Rio Grande do Norte - UFRN Natal RNCEP 59078-970 Brazil Postgraduate Program in Chemistry Chemistry Institute Federal University of Rio Grande do Norte - UFRN Natal RNCEP 59078-970 Brazil Chemistry Department Federal Institute of Education Science and Technology of Maranhão - IFMA São LuísMACEP 65076-091 Brazil Department of Chemical Engineering Federal University of Rio Grande do Norte - UFRN Natal RNCEP 59078-970 Brazil

In this work, zinc aluminate spinel was prepared by two methods of directly synthesis (without calcination): microwave assisted combustion and hydrothermal method. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2-adsorption/ desorption isotherms. The XRD patterns confirmed the formation of cubic ZnAl2O4 spinel structure with no secondary phases for both synthesis routes, whereas the hydrothermal method yielded powders with crystallite size 3 times smaller (6.9 nm), as compared to the powders produced by microwave assisted combustion method (25.6 nm). The micrographs revealed agglomerated powders with plate-like morphologies for both routes. Nitrogen adsorption/desorption isotherms (bET) revealed higher surface area (183 m2.g-1) and greater pore volume (0.173 cm3.g-1) for ZnAl2O4 powders prepared by the hydrothermal method. © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Zinc compounds

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Virtual material characterization process for composite materials: An industrial solution 17

Virtual material characterization process for composite mate...

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17th European Conference on Composite materials, ECCM 2016

作者： Farkas, Laszlo Vanclooster, Kristof Erdelyi, Hunor Sevenois, Ruben Lomov, Stepan V. Naito, Tadashi Urushiyama, Yuta Van Paepegem, Wim Siemens Industry Software NV Interleuvenlaan 68 LeuvenB-3001 Belgium Department of Materials Science and Engineering Ghent University Technologiepark-Zwijnaarde 903 GhentB-9052 Belgium Department of Metallurgy and Materials Engineering Katholieke Universiteit Leuven Kasteelpark Arenberg 44 LeuvenB-3001 Belgium Honda R and D Co. Ltd. Tochigi Japan SIM vzw M3 Program Technologiepark-Zwijnaarde 935 GhentB-9052 Belgium

ISBN: (纸本)9783000533877

Detailed material modeling covering low continuum scales and scale-transition methods offers material and design engineers a virtual tool for the virtual material assessment and optimization, relaxing on the experimental testing efforts. This contribution demonstrates the different steps of a Virtual Material Characterization (VMC) process applied for the prediction of elastic properties of a real meso-scale composite geometry. The presented R&D results have been achieved as part of a running R&D program (M3 MacroModelMat), in which the meso-modeling framework will be extended with a key and unique aspect: non-linear and damage composite behavior to be used for attributes such as static strength, dynamic strength and NVH. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Composite materials

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PEO ceramic coating on Mg-10%wt. Zn for potential biological application 5th

PEO ceramic coating on Mg-10%wt. Zn for potential biological...

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5th International Congress on Ceramics, ICC 2014

作者： Hu, Jonathan Nie, Xueyuan Medical Science Program Faculty of Science Western University LondonONN6A 3K7 Canada Department of Mechanical Automotive and Materials Engineering University of Windsor WindsorONN9B 3P4 Canada

ISBN: (纸本)9783038354895

Magnesium-zinc (Mg-Zn) alloys are strong candidates as medical implant materials due to their good biocompatibility and relatively high strengths. To manipulate the degradation of Mg-Zn alloy in the human body, a plasma electrolytic oxidation (PEO) treatment was applied to Mg-10%wt. Zn in this study because it produces a coating that is non-harmful to the human body and the process is inexpensive and environmentally friendly. Potentiodynamic polarization corrosion tests, performed in a simulated body fluid (Hanks' balanced Salt Solution) were applied to the coated and uncoated Mg-Zn samples. The results of the testing showed that the coated Mg-Zn exhibited higher corrosion resistance than the substrate. With the PEO coating thickness of 7.2 microns, the corrosion current density was reduced by 1.00 μA/cm2 from the uncoated Mg-Zn respectively, indicating a significant reduction in the degradation rate between pure Mg-Zn and coated Mg-Zn from 7.0 to 3.7 kg/year. A pin-on-disc tribometer was employed to measure the coefficient of friction (COF) for the coated and uncoated Mg-Zn samples, lubricated with and without Hanks' solution. The measured COF of the coated sample was very low (averaging to be about 0.22 under the lubricated condition) and comparable to that of the substrate which exhibited an averaged COF of 0.13 under the lubricated condition. © (2015) Trans Tech Publications, Switzerland.

关键词： biodegradation

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Deformation mechanisms in superplastic AA5083 materials

Deformation mechanisms in superplastic AA5083 materials

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作者： Kulas, Mary-Anne Green, W. Paul Taleff, Eric M. Krajewski, Paul E. McNelley, Terry R. Materials Science and Engineering Program University of Texas at Austin Austin TX 78712-0292 Department of Mechanical Engineering University of Texas at Austin Austin TX 78712-0292 Research and Development Center General Motors Corp. Warren MI 48090-9056 Department of Mechanical Engineering Naval Postgraduate School Monterey CA 93943-5146

The plastic deformation of seven 5083 commercial aluminum materials, produced from five different alloy heats, are evaluated under conditions of interest for superplastic and quick-plastic forming. Two mechanisms are shown to govern plastic deformation in AA5083 over the strain rates, strains, and temperatures of interest for these forming technologies: grain-boundary-sliding (GbS) creep and solute-drag (SD) creep. Quantitative analysis of stress transients following rate changes clearly differentiates between GbS and SD creep and offers conclusive proof that SD creep dominates deformation at fast strain rates and low temperature. Furthermore, stress transients following strain-rate changes under SD creep are observed to decay exponentially with strain. A new graphical construction is proposed for the analysis and prediction of creep transients. This construction predicts the relative size of creep transients under SD creep from the relative size of changes in an applied strain rate or stress. This construction reveals the relative size of creep transients under SD creep to be independent of temperature;temperature dependence resides in the "steady-state" creep behavior to which transients are related.

关键词： Aluminum alloys

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Thermoeconomic design and optimization of frost-free refrigerators

Thermoeconomic design and optimization of frost-free refrige...

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作者： Mitishita, Rodrigo S. barreira, Eduardo M. Negrão, Cezar O.R. Hermes, Christian J.L. Thermal Science Laboratory Postgraduate Program of Mechanical and Materials Engineering Federal University of Technology - Paraná Av. Sete de Setembro 3165 80230901 Curitiba PR Brazil Center for Applied Thermodynamics Department of Mechanical Engineering Federal University of Paraná P.O. Box 19011 81531990 Curitiba PR Brazil

An optimization methodology aiming at energy and cost savings in frost-free refrigerators is advanced. A steady-state simulation model was devised and its predictions for energy consumption were compared with experimental data obtained elsewhere, with differences not exceeding a +/- 9% error band. The model was used to find out the evaporator air flow rate, the number of evaporator and condenser fins, the compressor size and efficiency, and the insulation thicknesses of both fresh- and frozen-food compartments which yield the minimum energy consumption when the total cost is constrained. The optimization led to a refrigeration system with energy consumption 18% lower than that observed for the baseline system without any cost penalty. The system performance for four different compressors, including a high efficiency, a large capacity and a variable-speed one, was also analyzed. For the refrigerator under analysis, it was found that, to ensure an economically feasible design, the variable-speed compressor should not cost 26% more than a single-speed one with the same piston displacement. © 2012 Elsevier Ltd. All rights reserved.

关键词： Compressors

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