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Online since: November 2010
Authors: Li Xiang Li, Yong Chang Liu, Xin Gen, Bai Gang An
Introduction Carbon nanotubes (CNTs) have unique inner fabric structure, high specific surface area, good electronic properties and special mechanics [1-4], electrochemistry [5-8] and field-emission [9-12] have been expected in many applications.
In this study, two high nitrogen proportion organic agents, hydrazine hydrate and diethylenetriamine are used to modifying CNTs without destroying the intrinsic tubular structure.
Comparing these two N-CNTs, the benzenoid amine proportion of N-CNT1 is higher than that of N-CNT2, due to the structure and chemistry of hydrazine.
Meanwhile the original morphology and structure of CNT can be kept after treatment.
Online since: October 2011
Authors: Lan Xiong, Yi Mei Wu, Zhao Hui Xi, Lin Lin Shi, Xue Fei Miao
According to the structure of the two process chambers and the actual operating conditions, this paper builds up two finite element analysis models for each chamber, and Maxwell software of Ansoft Corporation is adopted to analyze instant electromagnetic energy in two chambers.
All efforts are helpful to provide a theoretical basis for the structure of water treatment chamber to attain better anti-scaling effect.
In addition, Maxwell software of Ansoft Corporation is adopted to calculate instant electromagnetic energy in two processing chambers with different structures.
Comprehensive comparison of field simulation and experimental data, we conclude that both structures of processing chambers have certain anti-scaling effects, but the effect of PCCE is better.
Measurement of triclosan in water using a magnetic particle enzyme immunoassay[J].Journal of Agricultural and Food Chemistry,2007, 55(10):3758-3763 [5] Zhang Weiwei, Zhang Guangyu, Dong Huijuan.
Online since: August 2018
Authors: Zhi Li Zhang, Nan Nan Di, Le Bai, Yang Yang, De Cai Li
All of the peaks completely correspond to the inverse spinel-type structure.
After the magnetic field being applied the shear stress increased sharply, it is because the Fe3O4 NPs connected to be chain or to be net arrangement under magnetic field and in some extent structure with direction generated.
This is because under the action of shear stress, dipole long chain broke into short chain, net structure broken into smaller pieces.
[7] Z Li, H Chen, A Haobo Bao, M Gao, One-Pot Reaction to Synthesize Water-Soluble Magnetite Nanocrystals, Chemistry of Materials 16 (2004) 1391-1393
[8] Huang Yan, LiJian, LiFeng, Influence of the Magneto-structure of CoFe2O4 Self-formed Ferrofluid on Its Magnetization,Chinese Journal of chemical Physics18(2005):585-588
Online since: February 2017
Authors: Tsutomu Mashimo, Shota Tamura, Zhazgul Kelgenbaeva, Kenta Yamamoto, Li Liang Chen
For the nanoscaled FePt, temperature lower than 1000°C would be sufficient to induce a phase transformation from the disordered A1-type phase to the ordered L10-type phase, as the increased surface are and tailored surface chemistry of nanoparticles would optimize their activity.
Thermal annealing after the synthesis induced the Fe and Pt atoms to rearrange into the long-range chemically ordered FCT structure.
As-synthesized nanoparticles possess a chemically disordered FCC crystal structure showing the peaks at 41.05°, 47.12°, 70.35° and 83.39° in 2θ, which are indexed as [111], [200], [220] and [311] peaks, respectively.
Also the structure variations have dramatic effects on the magnetic properties of the alloys.
Ferrer, Structure and Pt. magnetism of FePt nanoparticles investigated with X-ray. diffraction, J.
Online since: March 2013
Authors: Grzegorz Grzeczka
The two most important inventions are introduction of polymer electrolyte membrane and changes in the electrode structure which improves the efficiency of the catalyst and thereby reduces its quantity.
(Table 1) This certain stage of research required the involvement of a large group of professionals associated with the operation of underwater vehicles, chemistry and physics, which the author had an honor to lead during the construction of demonstrational model of low-temperature fuel cell technology[6,7] .
At the same time parameters like energy and mass transport, electrode kinetics and mechanical properties are closely related to the structure of the electrode.
The variable inputs of the system model Variable name Operating parameter Unit Fuel cell current [A] Inlet oxygen pressure [Pa] Inlet hydrogen pressure [Pa] Ambient pressure [Pa] The oxygen flow rate at the inlet [kg/s] The hydrogen flow rate at the inlet [kg/s] Oxygen humidity at the inlet [-] Hydrogen humidity at the inlet [-] Fuel stack temperature [K] The system model includes: loss of fuel cell performance, flow model between cathode and anode, membrane hydration model, model and structure of auxiliary system of hydrogen and oxygen supply, the hydrogen recirculation pump model, model of hydrogen pressure regulator, model of supply piping for hydrogen, model of humidifier, model and the structure of the fuel cell cooling auxiliary system, model of the cooling pump, thermal model of the fuel cell, coolant tank, heat exchanger liquid - liquid, demonstration of whole cooling system in the space of physical states, power converters.
Online since: January 2021
Authors: Masato Ueda, Kyosuke Mizuta, Shotaro Miyake, Masahiko Ikeda
Influence of Substitution of Fe by Mo on Heat Treatment Behavior in Ti-Mo-Fe Alloys Kyosuke Mizuta1,a, Shotaro Miyake1,b, Masahiko Ikeda2,c and Masato Ueda2,d 1Graduate School of Science and Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan 2Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan ak202085@kansai-u.ac.jp, bk577286@kansao-u.ac.jp, chikoik@kansai-u.ac.jp, dm-ueda@kansai-u.ac.jp Keywords: Titanium molybdenum iron alloy, Diffusion rate, Electrical resistivity, Vickers hardness, X-ray diffraction measurements Abstract.
Isothermal aging Table 2 tabulates the phase structure determined by XRD profiles at 673 K.
Table 2 Phase structure determined by XRD profiles at 673 K.
Table 3 shows the phase structure established by XRD profiles at 773 K.
Table 3 Phase structure determined by XRD profiles at 773 K.
Online since: December 2006
Authors: S.L. Toh, T.K.H. Teh, S. Vallaya, J.C.H. Goh
A variety of scaffold materials and structures have been explored, with popular material choices ranging from synthetic poly (L-Lactide) based biomaterials to natural polymer such as collagen.
Silk also consists of diverse amino acid side chemistries for facile coupling of selected growth or cell adhesion factors [8].
The nanofibers thus act as an intermediate construct that closes up the large pores of the knitted structure and bears large surface area-volume ratio with better hydrophilicity to support initial cell attachments, new ECM deposition and tissue formation [12].
Phase contrast images showed that diameter of PLGA nanofibers vary from 300 to 800 nm and were integrated into the knitted silk microstructure over all surfaces and thus covering up the large pores of knitted silk structure (Fig. 2).
Cell Morphology on Scaffolds. rBMSCs were verified to grow and proliferate into the scaffold structure over the 14 day period and exhibited an elongated cell morphology by Day 14, as evident in fluorescence microscopy and SEM images (Fig. 3).
Online since: January 2013
Authors: Xiao Li Xu, Tao Yu, Xiao Ling Cui, Hong Ming Zhang, Li Ping Mao
Especially, it can effectively stabilize the graphite structure even in pure propylene carbonate (PC) and facilitate the formation of solid electrolyte interface (SEI) on the surface of carbonaceous anode materials [3–8].
Since LiODFB has the same oxalatoborate anhydride structure as LiBOB, most of the unique characteristics of LiBOB in lithium-ion batteries have been found from LiODFB [5], moreover, it can form a more stable SEI film with lower interface impedance on the surface of the anode materials.
Besides, ascribed to the unique chemical structure of LiODFB, the combined advantages of LiBOB and lithium tetrafluoroborate (LiBF4) have been obtained from the LiODFB-based electrolyte, which include: (1) the optimized ionic conductivity over a wide temperature range, (2) the ability to provide a high cycling efficiency for metallic lithium plating and stripping on the surface of Cu, a current collector material of the graphite anode, (3) excellent ability to passivate Al at high potentials, (4) the ability to support graphite cycling in high PC-containing solutions, (5) the ability to support Li-ion cell operate at high temperatures, (6) the ability to support lithium ion batteries delivering high capacity at low temperatures and high current rates, and (7) the possibility to provide safety protection against abuse operations.
In addition, the computational chemistry of molecular simulations has been used to gain understanding into the chemical composition of the electrode/electrolyte interface as a function of electrode potential.
DFT calculations provide additional support for the structure of the LiBOB and LiDFOB derived components on the electrode surface [21,22].
Online since: January 2012
Authors: Bambang Sunendar Purwasasmita, Ivindra Pane, Iswandi Imran, Razie Hanafi, Partogi H. Simatupang
The weaker set of sample (a) was distinguishly identified since the surface shows granuler surface structure with very little homogenity and bonding. the opposite phenomenon can be found in sample with much higher strength (b).
The thightly layered plate-like structure indicates a very dense geopolymeric body.
This indicates that polymerization has occured as resulted in the amorphous structure.
The wavenumber reading at around 500 cm-1 related to in-plane bending vibration of Si-O, while the exceptionally strong peaks at around 1000-1200 cm-1 indicate Si-O(Al) structure or the SiO4 tetrahedra stretching vibration which validate that geopolymerization has occured [8].
[4] J.Davidovits, Chemistry of Geopolymeric Systems, A Terminology, Proceeding of The 2nd International Geopolymer Conference (1999), p.22
Online since: January 2014
Authors: Widyastuti Widyastuti, Mariani Lilis, S. Ridwan, M.A. Putrawan
Introduction Nozzle contributes 30% from total weight of rocket structure.
Its chemistry and microstructure influence durability through the structure and morphology of TBC.
Since andalusite has amorphous structure [9,10], it caused the irregular XRD pattern graph which indicates the amorphous structure.