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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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Bioenergy knowledge, perception and attitude among students at Jambi state senior high school 10

Bioenergy knowledge, perception and attitude among students ...

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10th International Conference on Theoretical and Applied Physics, ICTAP 2020

作者： Nazarudin Hasibuan, M.P.H. Haryadi, B. Nurhayati Ulyarti Hadiyanto Chemical Engineering FST University of Jambi Jambi Indonesia Energy and Nano Material Centre LPPM Universitas Jambi Jambi Indonesia Center of Excellent on Bio-Geo Material and Energy Universitas Jambi Jambi Indonesia Department of Enviromental Study Program University of Jambi Jambi Indonesia Department of Science Education Program University of Jambi Jambi Indonesia

Bioenergy is one of the renewable energies which is predicted to be a main energy in the next few years. It can play the important role to change the current fossil fuel-based energy into a green energy which has a low carbon footprint. A research about how to develop a bioenergy have been done by a lot of reseacher. However, especially in Indonesia, there is just few research to study about bioenergy from societal aspects poin of view such as the understanding and awarness of bioenergy among citizens. In this research, we have investigated senior high school students' knowledge, perceptions, and attitudes interconected to bioenergy with online survery. The survey instrument used in the study was adopted from P. Halder's study. The data was collected from students at senior high school th (SMAN 10) Jambi City. The results showed that the students awareness of bioenergy perceived from school, home, and social media have significant effects on their knowledge, perceptions and attitudes related to bioenergy. Among 211 students as respondent (N), we found 70.62% believe that they understand well the concept about bioenergy, 5.21% believe that they understand it very well, and the rest believe that they do not understand it. This understanding reflects to their willingness to use a bioenergy in their daily life, in which 71.70% respondents agree to use bioenergy, 25.47% respondents can not decide, and only 2.83% do not want to use it. To find the relationship among the variables, a multiple regression was conducted. A statistical analysis showed that the model for knowledge as a function of attitudes and perception does not fit the data therefore this model is rejected. However, both model for attitudes as function of perception and knowledge, and also perception as function of attitudes and knowldeges fit the data hence the models are accepted. In other words, attitudes of students who will use/not use bioenergy, is significantly affected by their perception about bioen

关键词： Students

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Definition of periodic boundary conditions in explicit dynamic simulations of micro- or meso-scale unit cells with conformal and non-conformal meshes 17

Definition of periodic boundary conditions in explicit dynam...

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17th European Conference on Composite materials, ECCM 2016

作者： Garoz, D. Gilabert, F.A. Sevenois, R.D.B. Spronk, S.W.F. Rezaei, A. Van Paepegem, W. Department of Material Science and Engineering Faculty of Engineering and Architecture Ghent University Tech Lane Ghent Science Park - Campus A Technologiepark Zwijnaarde 903 ZwijnaardeB-9052 Belgium SIM Program M3Strength Technologiepark Zwijnaarde 935 ZwijnaardeB-9052 Belgium

ISBN: (纸本)9783000533877

Although Periodic Boundary Conditions (PBCs) have been extensively used in finite elements to analyze unit cell models of composites, there are few reported investigations using explicit dynamic simulations. While different formulations and implementations of PBCs do not affect the results of quasi-static simulations solved by an implicit solver, they have an impact on the results of dynamic simulations solved by an explicit solver. A simple benchmark with a cubic unit cell of an isotropic linear elastic material is used to compare the results of different scenarios, which have different formulations and implementation of PBCs. The stress-strain curves under simple uniaxial tension shows that, in some scenarios, the explicit analyses do not follow the expected linear elastic behavior. These unexpected results are remarkable when the characteristic length of the model is in the range of few microns. This work encapsulates the relevant features of the different formulations and implementations of PBCs, and indicates in which scenarios the PBCs must be carefully applied. © 2016, European Conference on Composite materials, ECCM. All rights reserved.

关键词： Stress-strain curves

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Resistive Switching Early Failure and Gap Identification in Bilayer Selectorless RRAM Applications

Resistive Switching Early Failure and Gap Identification in ...

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2019 Device Research Conference, DRC 2019

作者： Chen, Ying-Chen Hu, Szu- Tung Lin, Chao-Cheng Lee, Jack C. University of Texas at Austin Department of Electrical and Computer Engineering AustinTX United States Material Science and Engineering Program University of Texas at Austin AustinTX78712 United States Taiwan Semiconductor Research Institute TSRI Hsinchu Taiwan

ISBN: (纸本)9781728121123

Resistive random access memory (RRAM) using various metal oxides (i.e., SiO[1], HfO, NiO[2], AlO, TaO5 etc.) have attracted a great attention since the current nonvolatile memory (NVM) has been approaching the scaling limits. However, the sneak path current (SPC) is a main problem in crossbar memory configuration. The SPC significantly affects the read/write operation, because each word line is connected in perpendicular directions to the word line where the interference current from neighbor cells cannot be avoided in the crossbar configurations. In order to suppress the sneak path current in the array application, the transistor, diode, or selector device is designed to be integrated next to the memory cell for reducing the SPC. However, the additional selector device in the socalled 1T-1R or 1S-1R architecture (Fig. 1(a)) increases the cell size, process complexity, and cost. Therefore, the self-rectifying behavior i.e. nonlinear resistive switching (RS) in a 1R-only selectorless RRAM cell has been proposed [3]-[6]. However, the mechanisms in nonlinear characteristic and reliability properties are not yet been investigated. This work studies the reliability of early failure and relaxation properties using gap identification method. © 2019 IEEE.

关键词： Hafnium oxides

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ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY OF BARE COPPER ELECTRODES THROUGH ULTRAFAST FEMTOSECOND LASER NANOSTRUCTURING 23

ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY O...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Ahmad, Shahbaz Egilmez, Mehmet Orhan, Mehmet F. Alnaser, Ali S. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Physics American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9786250008430

In this study, we report on enhancing the surface area of bare copper electrodes via femtosecond laser processing for its application in alkaline water electrolysis. It is shown that the laser nanostructuring process creates unique and hierarchal nanostructures superimposed over spiky microstructures. Analysing the effect of various laser parameters indicate that scanning speed greatly effects the microstructures by decreasing its dimensions and increasing porosity. The results also shows that laser processing has significantly enhanced the surface area with spiky and superhydrophilic structures. Furthermore, this process is expected to improve the hydrogen evolution reaction (HER) kinetics by allowing more electrode to electrolyte interface, which can favor the enrichment and formation of protons on structured Cu cathode. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Femtosecond lasers

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Ablative performance of graded polyetherimide nanocomposite foams

Ablative performance of graded polyetherimide nanocomposite ...

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SAMPE Tech 2013 Conference and Exhibition

作者： Jiang, Wei Sundarram, Sriharsha S. Wong, Derek Koo, Joseph H. Li, Wei Nano and Bio Materials Processing and Manufacturing Lab. Dept. of Mechanical Engineering University of Texas at Austin Austin TX United States Material Science and Engineering Program United States KAI LLC Austin TX United States

ISBN: (纸本)9781934551158

Many current thermal protection systems employ polymer resins as an ablative material. Foamed polymer nanocomposites usually exhibit improved thermal properties compared to the solid counterparts. This study evaluates the ablative performance of foamed polyetherimide (PEI)- Clay-Kraton (PCK) nanocomposites for thermal protection applications. PEI was compounded with nanoclay to improve the flame retardant property and Kraton to mitigate the loss of ductility. The PCK nanocomposite samples were foamed using a batch solid-state foaming process under variable saturation and foaming conditions. The ablative performance of the samples was analyzed based on a standard burn test with respect to the material composition and foaming condition. The results show that graded PCK composite foams can be obtained using the solid state foaming process. The porous structure can be controlled by adjusting the process conditions, including saturation time and pressure. It is further shown that the ablative performance of the nanocomposite foam can be optimized among clay loading, Kraton loading, and porosity of the foams.

关键词： Nanocomposites

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Micro-patterned surface for efficient capturing of circulating tumor cells

Micro-patterned surface for efficient capturing of circulati...

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Annual Northeast Bioengineering Conference

作者： Antony Thomas Chi-mon Chen Shu Yang Xuanhong Chen Yaling Liu Bioengineering Program Lehigh University USA Material Science and Engineering University of Pennsylvania USA Material Science and Engineering Lehigh University USA Mechanical Engineering and Mechanics Lehigh University USA

This work aims to design, fabricate, and characterize a micro-patterned surface that will be integrated into microfluidic devices to enhance particle and rare cell capture efficiency. Capture of ultralow concentration of circulating tumor cells in a blood sample is of vital importance for early diagnostics of cancer diseases. Despite the significant progress achieved in development of cell capture techniques, the enhancement in capture efficiency is still limited and often accompanied with drawbacks such as low throughput, low selectivity, pre-diluting requirement, and cell viability issues. The goal of this work is to design a biomimetic surface that could significantly enhance particle/cell capture efficacy through computational modeling, surface patterning, and microfluidic integration and testing. A PDMS surface with microscale ripples is functionalized with epithelial cell adhesion molecule (EpCAM) antibody to capture prostate cancer PC3 cells. Our microfluidic chip with micropatterns has shown significantly higher cell capture efficiency and selectivity compared to the chips with plane surface or classical herringbone-grooves.

关键词： Surface waves Microfluidics Tumors Educational institutions USA Councils materials Testing

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Chemical Vapor Deposited Teflon Amorphous Fluoropolymer as an Interlevel Dielectric material for Low Power Integrated Circuits

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MRS Online Proceedings Library 1997年第1期476卷 207-212页

作者： R. Sharangpani R. Singh Department of Electrical and Computer Engineering Clemson University Clemson USA Department of Electrical and Computer Engineering and Material Science and Engineering Program Clemson University Clemson USA

The development of materials with dielectric constant (K) less than SiO2 (K=3.9) is essential to meet the stringent speed, power dissipation and crosstalk requirements that are driving the low power integrated circuit (IC) paradigm. Both the low K dielectric and the processing methodology used for it should satisfy several important criteria before the technique can be accepted in future mainstream low power IC manufacturing. We had reported earlier a chemical vapor deposition (CVD) technique for the deposition of DuPont's Teflon amorphous fluoropolymer 1600 (bulk K=1.93) using the principle of direct liquid injection. The processing was carried out with and without an ultra violet (UV) light source in a computerized rapid isothermal processing (RIP) system. Recently, we have extensively characterized the films and examined the suitability of our technique in light of some of the requirements of the future IC industry. Our results indicate that the processed films exceed several of the established dielectric performance standards outlined in recent roadmaps for sub 0.25 μm ICs. The film properties were improved when the UV source was used during processing. CVD processed films in general demonstrated significant improvements in terms of manufacturability, throughput, cost, and dielectric properties over the same films processed by alternate techniques.

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“Graphene-Like” Exfoliation of Quasi-2D Crystals of Titanium Ditelluride: A New Route to Charge Density Wave materials

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MRS Online Proceedings Library 2011年第1期1344卷 1-5页

作者： Javed M. Khan Desalegne Teweldebrhan Craig M. Nolen Alexander. A. Balandin Nano-Device Laboratory Department of Electrical Engineering and Material Science and Engineering Program Bourns College of Engineering University of California – Riverside California USA

We used a “graphene-like” mechanical exfoliation to obtain atomically thin films of TiTe2. The building blocks of titanium ditelluride are atomic tri-layers separated by the van der Waals gaps. The exfoliation procedure allows one to obtain the few-atom-thick films with strong confinement of charge carriers and phonons. We have verified the crystallinity of the exfoliated films and fabricated the back-gated field-effect devices. The current – voltage characteristics of the TiTe2 devices revealed strong non-linearity, which suggests the charge-density wave effects. The obtained results are important for the proposed application of TiTe2 for the charge-density wave devices and thermoelectric energy conversion.

关键词： thin film crystalline layered

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Characterizations of trimetallic heteronuclear Bi1-xLa x[Fe(CN)6]·n(H2O) complexes and their thermal decomposition products

Characterizations of trimetallic heteronuclear Bi1-xLa x[Fe(...

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作者： Aono, Hiromichi Kondo, Nobuyuki Katagishi, Haruo Kurihara, Masato Sakamoto, Masatomi Sadaoka, Yoshihiko Department of Materials Science and Engineering Faculty of Engineering Ehime University Matsuyama 790-8577 Japan Graduate Program of Human Sensing and Functional Sensor Engineering Graduate School of Science and Engineering Yamagata University Yamagata 990-8560 Japan Department of Material and Biological Chemistry Faculty of Science Yamagata University Yamagata 990-8560 Japan

Heteronuclear Bi1-x La x [Fe(CN)6] &middotnH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TG... 详细信息

Heteronuclear Bi1-x La x [Fe(CN)6] ·nH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TGA), Auger electron spectroscopy (AES) with scanning electron microscope (SEM), and transmission electron microscopy (TEM). The crystal system of the complexes was orthorhombic having n = 4 for x = 0-0.7 and was hexagonal having n = 5 for x = 1.0. Their mixture was confirmed for x = 0.8 and 0.9. The lattice parameters for the orthorhombic increased with increasing the x value for the complexes. The single phase of trimetallic perovskite-type Bi1-x La x FeO3 was obtained by its thermal decomposition at low temperature. The crystal system was hexagonal for BiFeO3 (x = 0) and orthorhombic for x = 0.1-1.0. In the case of the decomposed perovskite sample, the lattice parameters decreased with increasing x values for Bi1-x La x FeO3. The particle size was ca. 30 nm for Bi0.2La0.8FeO3 obtained by thermal decomposition at 500 °C and it grew with an increase in decomposition temperature. For the Bi0.5La0.5FeO 3, AES showed that the elemental distributions of Bi, La, and Fe on the surface were very homogeneous for the sample decomposed at 700 °C.

关键词： Bismuth compounds

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