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Online since: October 2011
Authors: Ya Li Gao, Dong Lei Zhang, Yong Ji Shi, Fang Ye
Such a composite structure can be obtained by two general methods: encapsulation and phase separation.
Such a structure may scatter incident light under two general conditions.
The latter feature is very important, because such a histeresis, often present for PLCC structures, may cause image blocking or introduce unwanted memory effects.
International Union of Pure and Applied chemistry, Pisa (1992).
Such a structure may scatter incident light under two general conditions.
The latter feature is very important, because such a histeresis, often present for PLCC structures, may cause image blocking or introduce unwanted memory effects.
International Union of Pure and Applied chemistry, Pisa (1992).
Online since: June 2015
Authors: Yogendra Prasad Yadava, José Carlos da Silva Oliveira, R.A. Sanguinetti Ferreira
The ceramics also have a quite diversified atomic structure.
In the case of A2BB'O6 perovskite, two octahedras (BO6) and (B'O6) are formed, which alternate with each other in the atomic structure of the material.
Galasso: Structure, Properties and Preparation of Perovskite.
Tyagi: Materials Chemistry and Physics Vol. 98 (2006), p. 486
In the case of A2BB'O6 perovskite, two octahedras (BO6) and (B'O6) are formed, which alternate with each other in the atomic structure of the material.
Galasso: Structure, Properties and Preparation of Perovskite.
Tyagi: Materials Chemistry and Physics Vol. 98 (2006), p. 486
Online since: September 2003
Authors: Jing Kun Guo, J.W. Ning, Yu Bai Pan, J.J. Zhang
Guo
The State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai
Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-xi Road, Shanghai
200050, China, email: njw0236@163.com
Keywords: Carbon nanotubes (CNTs), SiO2, Surfactant, Sol-gel processes, Composites
Abstract.
Hwang believed [10] that the surfactant molecules can form co-micelle structures with CNTs via strong van der Waals force.
It can also be inferred that the other two surfactants are absorbed on the surface of CNTs due to their similar molecular structure.
Therefore, the dispersion homogeneity and related problem including type of dispersion agent, interface chemistry and dispersion mechanism are still important subjects needed to be investigated in the future.
Hwang believed [10] that the surfactant molecules can form co-micelle structures with CNTs via strong van der Waals force.
It can also be inferred that the other two surfactants are absorbed on the surface of CNTs due to their similar molecular structure.
Therefore, the dispersion homogeneity and related problem including type of dispersion agent, interface chemistry and dispersion mechanism are still important subjects needed to be investigated in the future.
Online since: October 2006
Authors: Kirsten Bobzin, Michel Maes, Philipp Immich, Erich Lugscheider
By forming a
nano-crystalline structure, an increase in mechanical properties and hardness was achieved for an
oxygen flow rate of 2.25 sccm (figure 2).
O2 flow Figure 2: effect of O2 partial pressure on film structure (pressure 0.2 Pa, duty cyle 1:4) To investigate the high temperature stability during thixoforming, high temperature (HT)-X-Ray diffraction was performed with the developed coatings.
Figure 3: monolayer γ-Al2O3 (left) and TiAlN/γ-Al2O3 Multilayer (right) Also the process temperature, deposition pressure and target power density have a strong influence of the coating structure.
Chemistry B Vol. 101 (1997), pp. 603-613 [7] K.
O2 flow Figure 2: effect of O2 partial pressure on film structure (pressure 0.2 Pa, duty cyle 1:4) To investigate the high temperature stability during thixoforming, high temperature (HT)-X-Ray diffraction was performed with the developed coatings.
Figure 3: monolayer γ-Al2O3 (left) and TiAlN/γ-Al2O3 Multilayer (right) Also the process temperature, deposition pressure and target power density have a strong influence of the coating structure.
Chemistry B Vol. 101 (1997), pp. 603-613 [7] K.
Online since: October 2010
Authors: Gui Yang Liu, Jun Ming Guo, Bao Sen Wang
Low-temperature synthesis of improved LiMn2O4 by a modified solution
combustion synthesis
Guiyang Liu1,a , Junming Guo
2,b, Baosen Wang1
1
College of Science, Honghe University, Mengzi Yunnan, China 661100
2
School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming Yunnan,
China 650031
a
liuguiyang@tsinghua.org.cn, bguojunming@tsinghua.org.cn
Keywords: spinel, lithium ion batteries, cathode materials, solution combustion synthesis
Abstract.
The structure, morphology and electrochemical performance of the as-prepared LiMn2O4 have been investigated in detail.
Results and discussion Structures and compositions.
It is also gotten that all the diffraction peaks of patterns MSC400, MSC500 and MSC600 correspond to a single-phase of cubic spinel structure with a space group Fd-3m (JCPDS 35-0782), and the strong diffraction peaks indicate good cystallinity of the obtained LiMn2O4.
The structure, morphology and electrochemical performance of the as-prepared LiMn2O4 have been investigated in detail.
Results and discussion Structures and compositions.
It is also gotten that all the diffraction peaks of patterns MSC400, MSC500 and MSC600 correspond to a single-phase of cubic spinel structure with a space group Fd-3m (JCPDS 35-0782), and the strong diffraction peaks indicate good cystallinity of the obtained LiMn2O4.
Online since: November 2007
Authors: Guy Daculsi, Dominique Chauveaux, Maryse Moinard, Claude Mais, Marlene Durand, Claire Pollart, Thierry Fabre
Introduction
Following a loss of osseous substance, it is often necessary to restore the osseous structure.
Moreover, the 3- dimensional structure of the network favourably influences recruitment, cellular differentiation, angiogenesis and the formation of bone tissue [6].
Ionic cements arise directly from the chemistry of calcium phosphates.
We have already developed a concept of artificial bone (non-hardening injectable ceramic named MBCP gel®; CNRS patent) [8] based on specific chemical properties and a micro and macroporous structure for an in-depth cellular colonization and a bone ingrowth at the expense of the bioceramic.
Moreover, the 3- dimensional structure of the network favourably influences recruitment, cellular differentiation, angiogenesis and the formation of bone tissue [6].
Ionic cements arise directly from the chemistry of calcium phosphates.
We have already developed a concept of artificial bone (non-hardening injectable ceramic named MBCP gel®; CNRS patent) [8] based on specific chemical properties and a micro and macroporous structure for an in-depth cellular colonization and a bone ingrowth at the expense of the bioceramic.
Online since: January 2005
Authors: Jingyu Hyeon Lee, Yi Yeol Lyu, Mong Sup Lee, Jin Heong Yim, Sang Youl Kim
Journal Citation (to be inserted by the publisher)
Copyright by Trans Tech Publications
Characterization of Nanoporous Low Dielectric
Polysilsesquioxane Thin Films
Jingyu Hyeon-Lee
*1, Yi Yeol Lyu
1, Mong Sup Lee
2
,
Jin-Heong Yim
1 and Sang Youl Kim
2
1
Electronic Materials Laboratory, Samsung Advanced Institute of Technology,
Suwon, 440-600, Korea
2
Department of Chemistry, Korea Advanced Institute of Science and Technology,
Taejon, 305-701, Korea.
Reaction scheme for P(M-co-CSSQs) (a) and structure of the poly (ε-caprolactone) (b) The refractive indices and dielectric constants of the P(M-co-CSSQ) films prepared from the P(M-co-CSSQ) mixture containing 0 to 20 vol. % of the 4-arm star shaped PCL with a degree of polymerization (DP), 7.5/arm, were plotted as a function of the PCL volume % in Figure 2.
The reduced hardness and elastic modulus of the PCL (from 10 to 20 vol. %) blended P(M-co-CSSQ) films may be attributed to a relatively more porous structure of the films compared with the P(M-co-CSSQ)-only film.
As is expected, the more porous the film is, the less network structure is formed in the film due to the existence of the film porosity.
Reaction scheme for P(M-co-CSSQs) (a) and structure of the poly (ε-caprolactone) (b) The refractive indices and dielectric constants of the P(M-co-CSSQ) films prepared from the P(M-co-CSSQ) mixture containing 0 to 20 vol. % of the 4-arm star shaped PCL with a degree of polymerization (DP), 7.5/arm, were plotted as a function of the PCL volume % in Figure 2.
The reduced hardness and elastic modulus of the PCL (from 10 to 20 vol. %) blended P(M-co-CSSQ) films may be attributed to a relatively more porous structure of the films compared with the P(M-co-CSSQ)-only film.
As is expected, the more porous the film is, the less network structure is formed in the film due to the existence of the film porosity.
Online since: May 2013
Authors: Xiao Dong Liu, Jin Zhu Zhang, Si Si Zhu
Based on the results determined by X-ray diffraction, this phase has a LaAs crystal structure (see fig.4).
Based on the results determined by X-ray diffraction (see fig.4), there are some diffraction lines unidentified that are probably concerned with the crystal structure of the La10Fe50As40 whose X-ray diffraction pattern might have not been reported.
Based on the results determined by X-ray diffraction, this phase has a Fe2As crystal structure (see fig.4).
Inorganic Chemistry, Vol. 49(2010), p. 2325 字典 - 查看字典详细内容
Based on the results determined by X-ray diffraction (see fig.4), there are some diffraction lines unidentified that are probably concerned with the crystal structure of the La10Fe50As40 whose X-ray diffraction pattern might have not been reported.
Based on the results determined by X-ray diffraction, this phase has a Fe2As crystal structure (see fig.4).
Inorganic Chemistry, Vol. 49(2010), p. 2325 字典 - 查看字典详细内容
Online since: January 2005
Authors: Stanislaw Gierlotka, Krzysztof Jan Kurzydlowski, K. Konopka, J. Michalski
First signs of grain growth of the ceramic matrix are seen in the temperature of about 1100o C, yet in
this temperature the material structure is still uniform (Fig. 1c).
In the temperature of about 1200o C, distinct changes occur in the material structure.
Regardless of the sintering temperature, the structures of the pure ceramic sinters do not differ as to their grain sizes, yet comparing to the sintered in 1400 o C composite (Fig. 1f) their grains are finer.
Trzaska, Materials Chemistry and Physics,Vol.81 (2003) p.407- 410 [5] J.F.
In the temperature of about 1200o C, distinct changes occur in the material structure.
Regardless of the sintering temperature, the structures of the pure ceramic sinters do not differ as to their grain sizes, yet comparing to the sintered in 1400 o C composite (Fig. 1f) their grains are finer.
Trzaska, Materials Chemistry and Physics,Vol.81 (2003) p.407- 410 [5] J.F.
Effect of Magnesium Ion on the Precipitation of Hollow Calcium Carbonate by Bubble Templating Method
Online since: August 2006
Authors: Gunawan Hadiko, Yong Sheng Han, Minoru Takahashi, Masayoshi Fuji
Introduction
CaCO3 has three kinds of crystal polymorphs, namely calcite, aragonite, and vaterite, with
rhombohedral, orthorhombic and hexagonal structures, respectively.
There is not hollow structure in the others sample with the magnesium ion concentration 0.005 mol/l to 0.05 mol/l.
Sample with concentration of magnesium ion 0.05 mol/l resulted in particles of rhombohedral structure (figure is not shown).
Mann: Biomineralization: Principles and Concepts in Bioinorganic Materials Chemistry (Oxford University Press, Oxford 2001)
There is not hollow structure in the others sample with the magnesium ion concentration 0.005 mol/l to 0.05 mol/l.
Sample with concentration of magnesium ion 0.05 mol/l resulted in particles of rhombohedral structure (figure is not shown).
Mann: Biomineralization: Principles and Concepts in Bioinorganic Materials Chemistry (Oxford University Press, Oxford 2001)