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Online since: March 2007
Authors: F. Azarmi, A. Moradian, J. Mostaghimi, L. Pershin, Tom W. Coyle
The
present work deals with APS deposited Inconel 625 structures consisting of huge number of
individual splats formed by impacting molten droplets on substrates during spraying process.
Microstructure consists of lamellae's that are aligned on top of each other and form a quasi-layered structure.
Some reports suggest that the splats solidification results in columnar grain structures mostly concentrated in the central region of the splat [7].
As it is pointed with arrows in the picture; the columnar grain structures are observable in some region of the splat cores.
Chandra,"Dynamics of Splat Formation in Plasma Spray Coating Process", Plasma Chemistry and Plasma Processing Vol. 22, No. 1, (2002), p. 59
Microstructure consists of lamellae's that are aligned on top of each other and form a quasi-layered structure.
Some reports suggest that the splats solidification results in columnar grain structures mostly concentrated in the central region of the splat [7].
As it is pointed with arrows in the picture; the columnar grain structures are observable in some region of the splat cores.
Chandra,"Dynamics of Splat Formation in Plasma Spray Coating Process", Plasma Chemistry and Plasma Processing Vol. 22, No. 1, (2002), p. 59
Influence of Direct Current Magnetron Sputtering Parameters on Electrical Properties of Copper Films
Online since: November 2010
Authors: Rui Fang Chen, Yin Qun Hua, Zhong Xiu Niu, Jie Yu
China
2School of Chemistry & Environment, Beijing University of Aeronautics and Astronautics,
Beijing 100083, P.R.
As the substrate temperature “structure zone model” effect, the Cu film resistivity decreases when the substrate temperature was less than 150°C.
The crystallization of thin films the better, the structure of films the more compact.
Dense column and pore structure composed the thin film at this time.
These make Cu atoms arrange in fcc crystal and form the grains with complete crystal structure in a certain range.
As the substrate temperature “structure zone model” effect, the Cu film resistivity decreases when the substrate temperature was less than 150°C.
The crystallization of thin films the better, the structure of films the more compact.
Dense column and pore structure composed the thin film at this time.
These make Cu atoms arrange in fcc crystal and form the grains with complete crystal structure in a certain range.
Online since: November 2011
Authors: Cheng Sun, Qian Huang, Yuan Yuan Wang, Qi Ming Xian
A new kind of material ACF/NZVI with approximate 9.64% (wt%) iron was prepared, the structure of the prepared ACF/NZVI was characterized by SEM, XRD and BET.
The use of NZVI particles is an excellent way to achieve high surface area using simple chemistries for formation.
SEM (X650, Hitachi, Japan) was used to observe the surface state and structure of the different materials (NZVI, ACF, pre-reaction ACF/NZVI); EDX spectra were obtained for determining elemental composition of different materials (ACF, pre-and post-reaction ACF/NZVI);X-ray diffraction (XRD) patterns were recorded to analyze the phase and crystal structure of the pre-reaction ACF/NZVI using X'Pert Pr X (Philips); The BET surface area of pre-reaction ACF/NZVI by the N2 adsorption method was measured at 77 K using a BET analyzer (Micromeritics, USA).
The crystal structure of iron was a regular α-Fe crystalline state.
The use of NZVI particles is an excellent way to achieve high surface area using simple chemistries for formation.
SEM (X650, Hitachi, Japan) was used to observe the surface state and structure of the different materials (NZVI, ACF, pre-reaction ACF/NZVI); EDX spectra were obtained for determining elemental composition of different materials (ACF, pre-and post-reaction ACF/NZVI);X-ray diffraction (XRD) patterns were recorded to analyze the phase and crystal structure of the pre-reaction ACF/NZVI using X'Pert Pr X (Philips); The BET surface area of pre-reaction ACF/NZVI by the N2 adsorption method was measured at 77 K using a BET analyzer (Micromeritics, USA).
The crystal structure of iron was a regular α-Fe crystalline state.
Online since: January 2011
Authors: Bai Mei Tan, Xin Huan Niu, Yu Ling Liu, Jia Xi Wang, Xiao Wei Gan, Rui Shi, Ming Sun, Yan Gang He
Hence, acidic slurries with BTA for Cu CMP process can not meet more advanced nodes than 45nm, therefore, in addition to reducing the down pressure of CMP, a careful design to increase chemistry performance of alkaline slurry, with favorable Complexing Agents, is necessary to support efficient, chemically dominant CMP of Cu in interconnect structure containing low k dielectrics.
Part 1 Part 2 Part 3 Copper Multilayer Interconnection Wafer Fig.1 The damascene Structure of Cu Pattern Fig.2 Cross sectional View of Cu Pattern Wafer Wafer for Part1, Part2 and Part3 Table.1 The formation of Cu Alkaline Slurry Cu Alkaline Slurry (ml) DI water (ml) H2O2 (ml) pH Cu1 100 194.4 8.7 10.46 Cu2 200 94.4 8.7 10.56 Commercial Acidic Slurry — — — 3.6 Results and discussion Performance of Removal Rate of Cu alkaline Slurry In our present experiment, two kinds of alkaline slurry with different formation (Cu1 and Cu2) were prepared.
Part 1 Part 2 Part 3 Copper Multilayer Interconnection Wafer Fig.1 The damascene Structure of Cu Pattern Fig.2 Cross sectional View of Cu Pattern Wafer Wafer for Part1, Part2 and Part3 Table.1 The formation of Cu Alkaline Slurry Cu Alkaline Slurry (ml) DI water (ml) H2O2 (ml) pH Cu1 100 194.4 8.7 10.46 Cu2 200 94.4 8.7 10.56 Commercial Acidic Slurry — — — 3.6 Results and discussion Performance of Removal Rate of Cu alkaline Slurry In our present experiment, two kinds of alkaline slurry with different formation (Cu1 and Cu2) were prepared.
Online since: March 2011
Authors: Yuan Chao Liu, Bao Min Sun, Zhao Yong Ding
Introduction
As a new kind of carbon nano-materials, carbon nanotube has unique structure and properties.
And the carbon nanotubes are with bad structure.
References [1] Salvetat Delmotte J P, Rubio A: Carbon, Vol. 40(2002), p.1729 [2] Tsukagoshi K, Yoneya N, Uryu S, et al: Physica B , Vol. 323(2002), p.107 [3] Jean-Marc Bonard, Mirko Croci, Christian Klinke, et al:Carbon , Vol. 40(2002), p.1715 [4] Becher M, Haluska M, Hirscher M, et al: C R Physique , Vol. 4(2003), p. 1055 [5] Ebbesen T W, Ajayan P M: Nature, Vol. 358(1992), p. 220 [6] Thess A, Lee R, Nikolaev P, et al: Science, Vol. 273(1996), p. 483 [7] Andrews R, J acques D, Rao A M, et al: Chemical Physics Letters, Vol. 40(1999), p. 467 [8] Venegoni D, Serp P, Feurer R, et al: Carbon, Vol. 40(2002), p. 1799 [9] Randall L Vander Wal, Thomas M Ticich and Valerie E Curtis: Journal of Physical Chemistry A , Vol. 104(2000), p. 7209
And the carbon nanotubes are with bad structure.
References [1] Salvetat Delmotte J P, Rubio A: Carbon, Vol. 40(2002), p.1729 [2] Tsukagoshi K, Yoneya N, Uryu S, et al: Physica B , Vol. 323(2002), p.107 [3] Jean-Marc Bonard, Mirko Croci, Christian Klinke, et al:Carbon , Vol. 40(2002), p.1715 [4] Becher M, Haluska M, Hirscher M, et al: C R Physique , Vol. 4(2003), p. 1055 [5] Ebbesen T W, Ajayan P M: Nature, Vol. 358(1992), p. 220 [6] Thess A, Lee R, Nikolaev P, et al: Science, Vol. 273(1996), p. 483 [7] Andrews R, J acques D, Rao A M, et al: Chemical Physics Letters, Vol. 40(1999), p. 467 [8] Venegoni D, Serp P, Feurer R, et al: Carbon, Vol. 40(2002), p. 1799 [9] Randall L Vander Wal, Thomas M Ticich and Valerie E Curtis: Journal of Physical Chemistry A , Vol. 104(2000), p. 7209
Online since: May 2007
Authors: Xiao Xia Li, Chungen Zhou
The pack chemistries were weighed and then mixed by
tumbling in an alumina mortar.
The structure, compositions and phase distribution of the as-deposited coatings and the coatings after oxidation were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). 3.
Conclusions Si-modified MCrAlY coating formed on Nb-base alloy shows a three-layer structure and has a large amount of Si in entire coating.
The structure, compositions and phase distribution of the as-deposited coatings and the coatings after oxidation were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). 3.
Conclusions Si-modified MCrAlY coating formed on Nb-base alloy shows a three-layer structure and has a large amount of Si in entire coating.
Online since: May 2011
Authors: Jia Guo, Xia Yang, Tao Zhang, Yao Ding, Jun Bo Li
With its well-developed pore structure, large specific area, strong adsorption capacity, good chemical stability and biocompatibility, activated carbon is widely used in the medical field.
Activated carbon from jackfruit peel waste by H3PO4 chemical activation: Pore structure and surface chemistry characterization.
Activated carbon from jackfruit peel waste by H3PO4 chemical activation: Pore structure and surface chemistry characterization.
Online since: September 2011
Authors: Li Qin Chai, Lan Zhou, Jian Zhong Shao
The relationships between structures of natural dyes and UV-protective ability were discussed.
All of these natural dyes’ molecular structures contain conjugated double bonds such as aromatic ring, long chain olefins, porphyrin, and donating conjugated groups such as -OH, -NH2, -NHR., which have strong ultraviolet absorption ability.
Acknowledgements The authors express their sincere thanks to Zhejiang public technology application research programs (Grant No. 2010C31115) and Zhejiang Top Academic Discipline of Applied Chemistry and Eco-Dyeing & Finishing and Innovative Research Team in University (Grant No.
All of these natural dyes’ molecular structures contain conjugated double bonds such as aromatic ring, long chain olefins, porphyrin, and donating conjugated groups such as -OH, -NH2, -NHR., which have strong ultraviolet absorption ability.
Acknowledgements The authors express their sincere thanks to Zhejiang public technology application research programs (Grant No. 2010C31115) and Zhejiang Top Academic Discipline of Applied Chemistry and Eco-Dyeing & Finishing and Innovative Research Team in University (Grant No.
Online since: December 2012
Authors: Ji Hua Li, Jia Cui Chen, Xiao Yi Wei, Dong Hui Han, Li Hong Cui, Yi Hong Wang, Chun Ying Ou
However, since cellulose has a special structure with numerous inter-and intra-molecular hydrogen bonds[1], complex cross-linking among hemicelluloses and lignin, it is found difficult to dissolve in water and common organic solvents, which limits its utilization[2].
The structure of the regeneration sugarcane was then characterized by Fourier transform infrared spectrophotometer(FT-IR).
Journal of Agricultural and Food Chemistry: Vol. 59(2011), P.8691 [2] N.
The structure of the regeneration sugarcane was then characterized by Fourier transform infrared spectrophotometer(FT-IR).
Journal of Agricultural and Food Chemistry: Vol. 59(2011), P.8691 [2] N.
Online since: July 2011
Authors: C. Tao, X. Li, J. Yang
Yang2
1 College of Chemistry & Chemical Engineering, Chongqing University, Chongqing 400030, PR China
2 The Key Lab for Optoelectronic Technology & System of the Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400030, PR China
ataochuanyi@cqu.edu.cn, bxuemingli@cqu.edu.cn
Keywords: Silica NW, Cryptophane-A, Methane detection, Luminescence.
Firstly, cryptophane-A was synthesized from vanillin according to a well-known method with modified procedures [3,8], the molecular structure of which is shown in Fig. 1.
Fig. 1 Structure of cryptophane-A Fig. 2 Schematic diagram of the homemade flow-through cell Results and Discussion Microstructural and compositional analysis.
Firstly, cryptophane-A was synthesized from vanillin according to a well-known method with modified procedures [3,8], the molecular structure of which is shown in Fig. 1.
Fig. 1 Structure of cryptophane-A Fig. 2 Schematic diagram of the homemade flow-through cell Results and Discussion Microstructural and compositional analysis.