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Avoiding interpenetrations and fibre volume fraction corrections in representative unit cells for textile composites through advanced geometry generation 17

Avoiding interpenetrations and fibre volume fraction correct...

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17th European Conference on Composite materials, ECCM 2016

作者： Sevenois, R.D.b. Garoz, D. Gilabert, F.A. Van Paepegem, W. Department of Materials Science and Engineering Faculty of Engineering and Architecture Ghent University Technologiepark Zwijnaarde 903 ZwijnaardeB-9052 Belgium SIM vzw M3 Program Technologiepark-Zwijnaarde 935 GhentB-9052 Belgium

ISBN: (纸本)9783000533877

A novel method for the geometrical generation of Representative Unit Cells (RUC) of textile composites is proposed. The advanced technique retains the advantage of an analytical formulation from the current state-of-the-art but introduces variable asymmetric yarn cross sectional shapes and paths which can be tailored to the yarn shapes and cross sectional areas as measured from in-situ microscopy. In this way, interpenetrations and incorrect fibre volume fractions, which occur when using traditional RUC generation techniques [1, 2], are avoided. In addition, meshing becomes easier and no stiffness corrections are required. The new technique is validated through a comparison of the novel RUC to: 1) a RUC with constant cross section;and 2) a RUC constructed from direct in-situ micro computed X-ray tomographic measurements of a carbon-epoxy weave. The technique is also an excellent alternative for advanced unit cell generation techniques based on production process simulations, e.g.[3], in the case that the production process is unknown or an analytic periodic geometry is required. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Composite materials

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New test set-up for measuring rate-dependent mode-I delamination properties of unidirectional and woven composites 17

New test set-up for measuring rate-dependent mode-I delamina...

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17th European Conference on Composite materials, ECCM 2016

作者： Spronk, S.W.F. Degrieck, J. Gilabert, F.A. Allaeys, F. Van Paepegem, W. Department of Materials Science and Engineering Faculty of Engineering and Architecture Ghent University Technologiepark-Zwijnaarde 903 ZwijnaardeB-9052 Belgium SIM vzw M3 Program Technologiepark-Zwijnaarde 935 GhentB-9052 Belgium

ISBN: (纸本)9783000533877

Impacts are highly dynamic events. Quasi-static test- and data reduction methods can thus not be used to characterize the response under impact, especially when the examined material is strain-rate sensitive. Delamination is a dominant failure mechanism in composite materials and the role played by the strain-rate in the material's integrity has to be studied under realistic load conditions. This work presents a new experimental setup designed to investigate the delamination process in mode-I when the specimen endures an impact load. A contactless optical technique is used to track the position and rotation of the specimen during the test. A finite element model is developed with the aim of correlating the features of the dynamic response with the value of fracture toughness. This experimental-numerical approach shows the importance of the inertia effects, which are clearly reflected on the speed of delamination. An adequate data reduction process is required to get a reliable value of the fracture toughness. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Delamination

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Remediation of hexavalent chromium by carboxymethyl cellulose @nylon-6 and chitin @ nylon-6 nanofibers;chitosan-coated nylon-6 fabric for imparting electro conductivity and UV protection

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International Journal of biological Macromolecules 2025年第PT 2期315卷 144457页

作者： Sajad Ur Rehman beig Shankar Lal Sharma Lalit Jajpura Manickam Selvaraj Jignasa V. Gohel Shakeel Ahmed Department of Textile Technology Dr. B.R Ambedkar National Institute of Technology Jalandhar Punjab 144008 India Department of Chemistry Faculty of Science King Khalid University Abha 61413 Saudi Arabia Research Centre for Advanced Materials Science (RCAMS) King Khalid University AlQura'a P.O. Box 960 Abha Saudi Arabia Department of Chemical Engineering Sardar Vallabhbhai National Institute of Technology Surat Gujarat 395007 India Postgraduate Department of Chemistry Government Postgraduate College Rajouri Jammu and Kashmir 185131 India

In this work, the solution blow spinning process was utilized to create new, nanofiber materials made of nylon 6@ carboxymethyl cellulose (CMC@N-6) and nylon 6 @chitin (Chitin@N-6), which were then effectively employed as adsorbents to remove chromium (VI) from aquatic systems. The nanofibers exhibited equivalent manufacturing rates of 2.4 g/h. The diameters of CMC@N-6 and Chitin@N-6 were found to be 160 nm and 95 nm, respectively. The optimum adsorption capacity of CMC@N-6 and Chitin@N-6 nanofibers can be achieved when the adsorbent dosage is 2.7 g/L, pH 3 (CMC@N-6), pH 2 (Chitin @N-6), contact time of 30 min, and preliminary Cr (VI) concentration of 60 mg/L at 340 K. The optimum adsorption capacity (Q max ) for CMC@N-6 and Chitin@N-6 was found to be 699.22 and 615.27 mg/g, respectively. The pseudo-second-order model for CMC@N-6 and Chitin@N-6 was the most appropriate for explaining the kinetic data. The Langmuir model matches the equilibrium data very well for both nano-fibers. Nylon fabric has very high surface resistivity and low Ultraviolet protection factor (UPF) value; thus, graphene oxide (GO) in conjunction with chitosan (CS) was applied to impart electrical conductivity and UV protection ( UPF) properties. In the same context, nylon fabric was treated with graphene oxide in conjunction with and without chitosan and glutaraldehyde (GA). Nylon samples were treated with three different concentrations of GO (0.4 %, 0.7 %, 1 %) by keeping concentrations of CS (1 %) and GA (1 %) constant, and the effect of these processes was seen on surface resistivity and UPF, along with washing durability of this finish. It was observed that graphene oxide treatment in conjunction with chitosan and glutaraldehyde (N-GA-CS-GO) shows maximum durability against washing treatment in comparison to graphene oxide treatment with only chitosan (N-CS-GO) and without chitosan and glutaraldehyde (N-GO). Later, the concentrations of the GA, CS, and GO were also been optimized for surface

关键词： Adsorption biopolymers Nanofiber Solution blow spinning Surface resistivity Ultraviolet protection factor

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Light scattering by white-emitting CdSe nanocrystals and traditional YAG:Ce3+ phosphor particles

Light scattering by white-emitting CdSe nanocrystals and tra...

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2008 MRS Fall Meeting

作者： Gosnell, Jonathan D. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University Station B 350106 Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Station B 351824 Nashville TN 37235 United States

ISBN: (纸本)9781615677740

In order for solid state lighting technology to become a mainstream technology, one of the major challenges to overcome is increasing the efficiency of these devices while maintaining a proper color balance. A significant source of efficiency loss in commercial phosphor-based white light-emitting diodes (LEDs) is light scattering off large, micron-sized phosphor particles. The use of recently reported single-size CdSe white-light nanocrystals in place of traditional phosphors, such as YAG:Ce3+, could lead to lower scattering losses and higher device efficiencies as a result of the extremely small CdSe core diameter of approximately 1.5 nm. This work theoretically and experimentally investigates the absorption, scattering, and extinction coefficients and cross sections of CdSe white-light nanocrystals in comparison to YAG:Ce3+ phosphor particles. Calculations were performed based on the Rayleigh approximation and Mie theory of scattering. Experiments were carried out using thin films of encapsulated nanocrystals. by measuring the absorbance and thickness of the films, in addition to the concentration of the nanocrystals, extinction coefficients and cross sections were determined using the beer-Lambert law. A reasonable agreement was obtained between theoretical and experimental data showing that the size of the particle has a significant impact on the extinction, absorption, and scattering properties of thin films. The considerably reduced scattering from the nanocrystals compared to traditional phosphors, along with their inherent high quality white light emission, makes them a promising candidate for future solid state lighting applications. © 2009 materials Research Society.

关键词： Cadmium compounds

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Atomic layer deposition and first principles modeling of glassy Lib>3b>bOb>3b>-Lib>2b>COb>3b> electrolytes for solid-state Li metal batteries

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JOURNAL OF materials CHEMISTRY A 2018年第40期6卷 19425-19437页

作者： Kazyak, Eric Chen, Kuan-Hung Davis, Andrew L. Yu, Seungho Sanchez, Adrian J. Lasso, Jose bielinski, Ashley R. Thompson, Travis Sakamoto, Jeff Siegel, Donald J. Dasgupta, Neil P. [a]Department of Mechanical Engineering University of Michigan Ann Arbor USA E-mail: ndasgupt@umich.edu [b] Department of Materials Science and Engineering University of Michigan Ann Arbor USA [c] Michigan Energy Institute University of Michigan Ann Arbor USA [d] Applied Physics Program University of Michigan Ann Arbor USA

Thin-film lithium solid electrolytes can serve as passivation layers, interfacial coatings, and enable 3D solid-state batteries. Here we present an Atomic Layer Deposition (ALD) process for synthesis of amorphous lithium borate-carbonate (LbCO) films. These films exhibit ionic conductivities up to 2.2 x 10(-6) S cm(-1), six times greater than previously reported for any ALD solid electrolyte. First principles calculations trace the high conductivity to contributions from enhanced rotational motion of the carbonate and borate anions achieved by precise control of Li and C content by ALD. The high conductivity, coupled with a wide band gap and electrochemical stability window, leads to a total area specific resistance (ASR) of <5 cm(2) for a 100 nm thick electrolyte and an ionic transference number >0.9999 from 0-6 volts vs. Li metal. The LbCO ALD solid electrolyte exhibits stability upon exposure to air, and in contact with both Li metal anodes and cathode materials. Thin-film full cells containing Li metal electrodes exhibit high coulombic efficiency for over 150 cycles with no capacity fading. These characteristics make glassy LbCO a promising new material for solid-state Li metal batteries.

关键词： Atomic layer deposition

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Study Of The Influence Of Milling Time On The Synthesis Temperature Of Monoclinic And Orthorhombic Nanostructured Cunb2o6 Via High-Energy Milling

Study Of The Influence Of Milling Time On The Synthesis Temp...

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Euro Powder Metallurgy 2023 Congress and Exhibition, PM 2023

作者： Gomes, Uilame Umbelino de Araújo, Kívia Fabiana Galvão José, Maria Lima, Santos De Souza, Vitor Manoel Silva Fernandes da Silva Lourenço, Cléber Raimundo, Rafael Alexandre Materials Science and Engineering Postgraduate Program Federal University of Rio Grande do Norte Natal59078-970 Brazil Department of Physics Federal University of Paraíba João Pessoa58051-900 Brazil

Copper niobate (CuNb2O6) has been studied for technological and environmental applications, such as in solar cells and photocatalysts, for example. And to make the application of CuNb2O6 even more feasible, in this study, therefore, high-energy milling was applied in its synthesis process with variation in the milling time, from the precursor powders Nb2O5 and CuO. The calcination occurred in a muffle with temperatures in the range of 500 °C to 1000 °C, for 3 h and heating rate of 5 °/min. Then, the powders were characterized by XRD, SEM, EDS and Raman. The powders showed crystallite sizes smaller than 80 nm, good homogeneity and high purity. The particle morphologies and the Raman spectrum are coherent with the literature. It was also verified that the increase in milling time reduced the initial formation temperature of the monoclinic phase and the calcination time for the complete formation of the orthorhombic phase. © European Powder Metallurgy Association (EPMA)

关键词： Mechanical alloying

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Devulcanization of natural rubber in composites with distinct crosslink densities by twin-screw extruder

Devulcanization of natural rubber in composites with distinc...

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作者： barbosa, Rafael Nunes, Anderson Thadeu Ambrósio, José Donato Materials Science and Engineering Postgraduate Program - PPGCEM Federal University of São Carlos - UFSCar São Carlos SP Brazil Center of Characterization and Materials Development - CCDM Federal University of São Carlos - UFSCar São Carlos SP Brazil

In this study, the effects of the devulcanization process realized by an intermeshing co-rotating twin-screw extruder (ICTSE) on three vulcanized Natural Rubber (NR) composites with different crosslink densities (CD) have been investigated. The extrusion parameters were fixed, as well as the initial material granulometry and auxiliary thermoplastic added to the process. After composites vulcanization, they were characterized accordingly their soluble fraction (SF), crosslink density (CD), mechanical properties and thermogravimetry (TGA). The extrusion was performed on the vulcanized elastomers pursuing selectively crosslink rupture and the same characterization previously cited was conducted on the devulcanized material, except the mechanical properties analysis. The extrusion demonstrate effective devulcanization, evidenced in the increasing of soluble fractions, reduction in crosslink density and thermal stability gain. These results are directly affected by preliminary differences on materials structure and presence of ethylene vinyl-acetate (EVA) on extrusion. © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Rubber

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Comparison of Cu−Al−Ni−Mn−Zr shape memory alloy prepared by selective laser melting and conventional powder metallurgy

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Transactions of Nonferrous Metals Society of China 2020年第12期30卷 3322-3332页

作者： Dennis GERA Jonadabe SANTOS Cláudio SKIMINAMI Piter GARGARELLA Postgraduate Program in Materials Science and Engineering Federal University of São CarlosSão CarlosBrazil Materials Engineering Department Federal University of São CarlosR.Washington Luískm 235-SP 310São CarlosBrazil

This work aimed to investigate and critically analyze the differences in microstructural features and thermal stability of Cu−11.3Al−3.2Ni−3.0Mn−0.5Zr shape memory alloy processed by selective laser melting(SLM)and conventional powder *** specimens were produced by sintering 106−180μm pre-alloyed powders under an argon atmosphere at 1060°C without secondary *** specimens were consolidated through melting 32−106μm pre-alloyed powders on a Cu−10Sn *** properties were measured through Vickers hardness *** scanning calorimetry was conducted to assess the martensitic transformation temperatures.X-ray diffraction patterns were collected to identify the metallurgical *** and scanning electron microscopy was used to analyze the microstructural features.b′1 martensite was found,irrespective of the processing route,although coarser martensitic variants were present in *** conventional powder metallurgy samples,intergranular eutectoid constituents and stabilized austenite also formed at room ***-specimens showed similar average hardness values to the SLM-specimens,albeit with high standard deviation linked to the *** specimens processed by SLM showed reversible martensitic transformation(T0=171°C).PM-processed specimens did not show shape memory effects.

关键词： shape memory alloys powder metallurgy additive manufacturing selective laser melting Cu-based alloys

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A Review of Carbon dots (CDs) Application in Sensing and Removing Medical Waste 5

A Review of Carbon dots (CDs) Application in Sensing and Rem...

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5th International Conference on Energy, Environmental and Information System, ICENIS 2020

作者： Alkian, Ilham Sutanto, Heri Aprimanti Utami, bella Rafika Duri, Inten A'Yuni, Dewi Qurrota Hadiyanto, H Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Smart Materials Research Center Diponegoro University Semarang Indonesia

Carbon dots materials (CDs) have the capability in the management of medical waste problem because of its advantage in the detection and degradation of pollutants. The synthesized CDs through various processes and raw materials have been applied to medical wastes, especially antibiotics such as tetracycline (TC), amoxicillin (AMX), para-Nitrophenol (p-NP), doxycycline (DC), ciprofloxacin (CIP), and oxytetracycline (OTC). These antibiotics are detected by utilizing changes in the luminescence property of CDs from the turn-off and turn-on mechanisms. Afterward, the degradation process is conducted using CDs as support materials agent semiconductors in the photosynthesis scheme. In general, CDs can be referred to as multifunction smart materials with the ability to detecting the presence of the antibiotics in simple, sensitive, and selective ways, and potency of medical pollutant removal clearly and effectively. © The Authors, published by EDP sciences, 2020.

关键词： Antibiotics

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Low temperature solvolthermally synthesized nitrogen-fluorine doped TiO2 for methyl orange photodegradation

Low temperature solvolthermally synthesized nitrogen-fluorin...

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2012 2nd International Conference on Key engineering materials, ICKEM 2012

作者： Kwamman, Tanagorn Smith, Siwaporn Meejoo Materials Science and Engineering Postgraduate Program Faculty of Science Mahidol University 272 Rama VI Road Ratchathevi Bangkok 10400 Thailand Department of Chemistry Center of Excellence for Innovation in Chemistry Mahidol University 272 Rama VI Road Ratchathevi Bangkok 10400 Thailand

ISBN: (纸本)9783037853825

A low temperature solvothermal method was employed to synthesize nitrogen-fluorine doped TiO2 materials (N/F -TiO2) at various mole ratio of Ti:F;10:1, 10:0.3 and 10:0.1, for photocatalytic applications. Doping fluorine and nitrogen in the TiO2 structure extend the spectra response of the materials toward a visible region resulting in the high efficiency to oxidize methyl orange (MO) under UV-Vis irradiation. The microstructure and photocatalytic activity of the materials appeared to depend on titanium precursors, titanium isopropoxide (TTIP) or tetrabutyl orthotitanate (TbOT), and the concentration of dopant (NH4F). The highest MO decolorization efficiency under UV-Vis irradiation for 30 minutes is about 86 % by using N-F-TiO2 (TTIP precursor) with Ti: F of 10: 3 as catalyst. The decolorization efficiencies of MO over N-F-TiO2 materials (TTIP precursor) are twice higher than that of the undoped catalyst. © (2012) Trans Tech Publications.

关键词： Titanium dioxide

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