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Online since: April 2011
Authors: Eduardo G. Pérez-Tijerina, Francisco Solís-Pomar, Eduardo Martínez-Guerra, Manuel Meléndrez-Castro
In the XRD spectrum is shown that the ZnO on the substrate surface has a hexagonal wurtzite-type structure.
By XRD and EDX analysis it was possible to determine the structure and composition of the ZnO-NWs, respectively.
The NW structure was determined from XRD spectrum in Fig. 3d.
The NWs had a wurtzite type structure characteristic of ZnO.
Govindaraj, Inorganic nanowires, Progress in Solid State Chemistry Vol. 31 (2003), p. 5-147
By XRD and EDX analysis it was possible to determine the structure and composition of the ZnO-NWs, respectively.
The NW structure was determined from XRD spectrum in Fig. 3d.
The NWs had a wurtzite type structure characteristic of ZnO.
Govindaraj, Inorganic nanowires, Progress in Solid State Chemistry Vol. 31 (2003), p. 5-147
Online since: January 2003
Authors: Tamás Réti, Károly Böröczky
Introduction
In several fields of material sciences, cellular structures (ranging from solid foams to
polycrystals) have been the subject of much interest in recent years.
Most studies have concentrated on 2-D cellular structures which may be represented by infinite, planar networks, usually with trivalent vertices (ie. three edges at each vertex) This paper presents a general method which is designated primarily to the topological evaluation of finite cellular systems composed of polygons and enables the classification of cellular structures on the basis of quantitative criteria.
Generally, it is supposed that atoms are located on the surface of an unbounded finite closed surface and form a cage-like structure.
Most of them can be used for the topological evaluation and classification of finite cellular structures.
Rassat: Toroidal and Spherical Fullerene-like Molecules with Only Pentagonal and Heptagonal Faces, International Journal of Quantum Chemistry, Vol. 84 (2001) p. 136-139
Most studies have concentrated on 2-D cellular structures which may be represented by infinite, planar networks, usually with trivalent vertices (ie. three edges at each vertex) This paper presents a general method which is designated primarily to the topological evaluation of finite cellular systems composed of polygons and enables the classification of cellular structures on the basis of quantitative criteria.
Generally, it is supposed that atoms are located on the surface of an unbounded finite closed surface and form a cage-like structure.
Most of them can be used for the topological evaluation and classification of finite cellular structures.
Rassat: Toroidal and Spherical Fullerene-like Molecules with Only Pentagonal and Heptagonal Faces, International Journal of Quantum Chemistry, Vol. 84 (2001) p. 136-139
Online since: September 2008
Authors: Stewart Ford, Toshio Narita, Shigenari Hayashi
Results
Before diffusion heat treatment the TMS82+ superalloy substrate had a regular γ/γ' cuboidal structure
while the electroplated platinum had a very fine grained structure.
After 1 hour at 1000ºC, the prior platinum outer region changed from fine-grained γ platinum, to a coarser two-phase structure of γ and Pt-rich γ' as can be seen in Fig. 2.
The middle region after 1 hour consisted of a two-phase γ and γ' mixture with morphology that was different to the original superalloy structure.
The γ' blocks of the superalloy structure decreased in volume fraction ahead of the grain boundary interface in the inner region.
Reid et al.[9] attributed the formation of TCP phases to nickel and aluminium diffusion, and alloy chemistry, as opposed to direct effect of platinum itself.
After 1 hour at 1000ºC, the prior platinum outer region changed from fine-grained γ platinum, to a coarser two-phase structure of γ and Pt-rich γ' as can be seen in Fig. 2.
The middle region after 1 hour consisted of a two-phase γ and γ' mixture with morphology that was different to the original superalloy structure.
The γ' blocks of the superalloy structure decreased in volume fraction ahead of the grain boundary interface in the inner region.
Reid et al.[9] attributed the formation of TCP phases to nickel and aluminium diffusion, and alloy chemistry, as opposed to direct effect of platinum itself.
Online since: March 2016
Authors: metwally ezzat, Mohammed Ghanim, Hassan Nageh, Ahmed Abd El-Moneim, Ahmed Hassanin
Hassanin 1, 2, d and Ahmed Abdel-moneim1, 3, e,*
1 Materials Science and Engineering Department, Egypt-Japan University of Science and Technology, New Borg El-Arab, Egypt.
2 Faculty of Engineering- Alexandria University, Egypt.
3Physical Chemistry Department, National Research Centre, Cairo, Egypt.
The size, shape and structure of Ag-NPs were measured using Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD), FT-IR and UV Spectrophotometers.
These nanofibers can form nonwoven textile mats, oriented fibrous bundles and even three-dimensional structured scaffolds, all with large surface areas and high porosity [21].
The crystalline structure of Ag-NPs was characterized using XRD technique.
Sawabe, Structure and stability of silver nanoparticles in aqueous solution produced by laser ablation, J.
The size, shape and structure of Ag-NPs were measured using Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD), FT-IR and UV Spectrophotometers.
These nanofibers can form nonwoven textile mats, oriented fibrous bundles and even three-dimensional structured scaffolds, all with large surface areas and high porosity [21].
The crystalline structure of Ag-NPs was characterized using XRD technique.
Sawabe, Structure and stability of silver nanoparticles in aqueous solution produced by laser ablation, J.
Online since: August 2004
Authors: Manabu Enoki, Satoshi Nishinoiri, Takeshi Mochizuki, Hiroshi Asamuma
Active composites
utilizing thermal deformation due to reinforced fibers embedded into metal matrix have been
proposed and the possibility of application to aircraft structures was studied.
Title of Publication (to be inserted by the publisher) Acknowledgement The present research is supported in part by a Grant for 21st Century COE Program "Human-Friendly Materials based on Chemistry" from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
Title of Publication (to be inserted by the publisher) Acknowledgement The present research is supported in part by a Grant for 21st Century COE Program "Human-Friendly Materials based on Chemistry" from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
Online since: October 2006
Authors: T. Tsuchida, K. Mochizuki
Mochizuki
Division of Materials Chemistry, Graduate School of Engineering, Hokkaido University,
N13 W8, Kita-ku, Sapporo, 060-8628, Japan, *tsuchida@eng.hokudai.ac.jp
Keyword: MA, SHS, SPS, ZrB2-ZrC Composite, Addition of Ta and Hf
Abstract.
After the MA-SHS process, the product was obtained in a morphology of the swelled and stratified structure.
After the MA-SHS process, the product was obtained in a morphology of the swelled and stratified structure.
Online since: October 2011
Authors: Ling Hua Wang, Chao Gan, Pan Hua Ning
But when the stress cycling times increases to near 107, damage stress σa of E36 steel in air no longer reduce, while in water, due to chemistry effect of water medium, damage stress will decrease as cycling times increase.
Fluid-structure coupling hydraulic vibration of runner blades of hrdraulic turbines(in Chinese).
Fluid-structure coupling hydraulic vibration of runner blades of hrdraulic turbines(in Chinese).
Online since: October 2010
Authors: Zhen Zhong Liu, Hui Ping Deng, Zhan Li Chen
The development of active heterogeneous systems to promote the Fenton chemistry which can operate near neutral pH is of considerable interest since it can offer some advantages, such as no need of acid or base, no sludge generation and the possibility of recycling the promoter [13].In these heterogeneous systems, the choice of the support is undoubtedly very important for the development of a good catalyst[17].
Activated carbon (AC) has been mostly used for this purpose since the 1970s for its high surface area and porous structure [18].
Activated carbon (AC) has been mostly used for this purpose since the 1970s for its high surface area and porous structure [18].
Online since: October 2012
Authors: Matthias Bünck, Andreas Bührig-Polaczek
Fig. 1: Al2O3-coated Ratchet-die for thixocasting steels
To reduce the form wear caused by the high temperature casting of steels, the X38CrMoV5-dies were coated by α-Al2O3 by PlaTeG GmbH, Siegen, Germany using a PECVD process specifically designed on the basis of a laboratory process developed at Materials Chemistry, RWTH Aachen University [10, 11].
Schneider: Effect of ion irradiation during deposition on the structure of alumina thin films grown by plasma assisted chemical vapour deposition, Applied Physics A 80 (8) (2005) 1657
Schneider: Effect of ion irradiation during deposition on the structure of alumina thin films grown by plasma assisted chemical vapour deposition, Applied Physics A 80 (8) (2005) 1657
Online since: January 2013
Authors: Su Fang Wang, Shou Jie Zhang, Chun Hong Dong, Guo Qing Wang, Jun Feng Guo, Wu Yong Sun
Simultaneous Determination of Four Herbicide and Pesticide Residues in Chinese Green Tea Using QuEChERS Purification Procedure and UPLC-MS/MS Analysis
Sufang Wang1, a, Shoujie Zhang1, Chunhong Dong2, Guoqing Wang3, b, Junfeng Guo1, Wuyong Sun1
1 Inspection and Quarantine Technical Center, Henan Entry-Exit Inspection and Quarantine Bureau, No.69 JiChang Road, Zhengzhou, 450003, China
2 Research Center for Huai Chinese Medicines, Jiaozuo University, No. 458, Industrial Road, Jiaozuo, 454003, China
3 Department of Applied Chemistry, Zhengzhou University of Light Industry, No.4 Dongfeng Road, Zhengzhou, 450002, China
aemail: wangsf0319@foxmail.com, bemail: gqwang@zzuli.edu.cn
Keywords: Ultra performance liquid chromatography tandem mass spectrometry.
Common names and structures of the four herbicides and pesticides are shown in Fig.1.
Common names and structures of the four herbicides and pesticides are shown in Fig.1.