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Online since: January 2012
Authors: Lian Ying An, Zheng Guo Zhang, Xian Yin Zhao
Syntheses of a Green Organic Phosphorescence Materials and Studies on their photoluminescent Properties
Lianying An, Zhengguo Zhang, Xianyin Zhao
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Si Chuang Province, China
anliany@cdut.edu.cn, zhenguozhang88@163.com, zxycdut@hotmail.com
Keywords: Phosphorescent material, Organic iridium( Ⅲ ) complexes, new synthesis plan.
The complex’s structures were characterized by IR, MS, and the differential thermal analysis.
By using IR, mass spectrometry, fluorescence spectroscopy and differential thermal analysis the structure and performance of the complex synthesized were characterized.
The structure of the phosphorescent material was characterized through IR, MS and other test results.
The complex’s structures were characterized by IR, MS, and the differential thermal analysis.
By using IR, mass spectrometry, fluorescence spectroscopy and differential thermal analysis the structure and performance of the complex synthesized were characterized.
The structure of the phosphorescent material was characterized through IR, MS and other test results.
Online since: September 2013
Authors: Mao Bin Wei, Dan Dan Wang, Zi Yang Lu, Peng Wei Huo, Yong Sheng Yan
Introduction
In recent years, photocatalyst which has a layered structure decomposed water to get hydrogen has become a research hotspot.
K2Ti4O9 has a layered structure, and it is made up of TiO6 octahedral through shared edge connection so that it becomes a chain structure.
During layered structure, K+ occupies the middle of the layer so that K+ has chemical activity.
The main structure of layered compounds K2Ti4O9 is TiO6 octahedral shared angle or edge forming negatively charged layer structure [3,4].
Crystal structure determination of ion-exchangeable layered perovskite compounds, K2La2Ti3O10 and Li2La2Ti3O10.
K2Ti4O9 has a layered structure, and it is made up of TiO6 octahedral through shared edge connection so that it becomes a chain structure.
During layered structure, K+ occupies the middle of the layer so that K+ has chemical activity.
The main structure of layered compounds K2Ti4O9 is TiO6 octahedral shared angle or edge forming negatively charged layer structure [3,4].
Crystal structure determination of ion-exchangeable layered perovskite compounds, K2La2Ti3O10 and Li2La2Ti3O10.
Online since: March 2012
Authors: Jian Zhang, Guo Lin Wang, Nai Ji Fu, Kui Wang
The finite element method was introduced in tire structure analysis in the late 1970s and early 1980s, the finite element analysis of tires gave tire designers with many forecasting information.
Current finite element analysis of tire structure had the following three difficulties: (1) the tire geometrical nonlinearity caused by the large deformation; (2) tire is a heterogeneous structure, its rubber material had incompressibility and obvious physical nonlinear, but the composite structure of rubber - cord had obvious anisotropy; (3) the large nonlinear deformation contact between tires and ground, rims.
The values of each part stress of tires, strain and strain ratio energy laid the foundation of further thermal fatigue analysis, and also played a guiding role for the tire structure improvement work.
Rubber Chemistry and Technology,1990,63(5):792~805
Pneumatic tires performance and structure[M].Guangzhou: South China science and technology university press,1998
Current finite element analysis of tire structure had the following three difficulties: (1) the tire geometrical nonlinearity caused by the large deformation; (2) tire is a heterogeneous structure, its rubber material had incompressibility and obvious physical nonlinear, but the composite structure of rubber - cord had obvious anisotropy; (3) the large nonlinear deformation contact between tires and ground, rims.
The values of each part stress of tires, strain and strain ratio energy laid the foundation of further thermal fatigue analysis, and also played a guiding role for the tire structure improvement work.
Rubber Chemistry and Technology,1990,63(5):792~805
Pneumatic tires performance and structure[M].Guangzhou: South China science and technology university press,1998
Online since: November 2014
Authors: S.K. Tripathi, Ramneek Kaur, Mamta Rani
Introduction
Metal oxides play a very important role in many areas of physics, chemistry, and materials science [1].
Single crystals of TiO2 also have rutile structure.
Rodríguez, Nanostructured oxides in chemistry: Characterization and properties, Chem.
Tarr, Inorganic Chemistry, 2nd Ed., Prentice-Hall Inc, New Jersey, 1999
Atkins, Inorganic Chemistry,3rd Ed., Oxford University Press, Oxford, 1999
Single crystals of TiO2 also have rutile structure.
Rodríguez, Nanostructured oxides in chemistry: Characterization and properties, Chem.
Tarr, Inorganic Chemistry, 2nd Ed., Prentice-Hall Inc, New Jersey, 1999
Atkins, Inorganic Chemistry,3rd Ed., Oxford University Press, Oxford, 1999
Online since: July 2014
Authors: Zeng Zhe Xi, Pin Yang Fang, Wei Long, Xiao Juan Li
The crystal structure of these compounds is composed of (Bi2O2)2+ layers interleaved with perovskite-like blocks (Am-1BmO3m+1)2-.
The complex structure caused by the lattice distortion may lead to the enhanced polarizability of the specimens [15].
Subbrarao, Crystal Chemistry of Mixed Bismuth Oxides with Layer-Type Structure, J.
Dorrian, Structure basis of ferroelectricity in the bismuth titanate family, Mater.
Maaoui, Structure distortion and dielectric properties of Sr1-x(Na0.5Bi0.5)xBi2Nb2O9 (x=0.0, 0.2, 0.5, 0.8 and 1.0), J.
The complex structure caused by the lattice distortion may lead to the enhanced polarizability of the specimens [15].
Subbrarao, Crystal Chemistry of Mixed Bismuth Oxides with Layer-Type Structure, J.
Dorrian, Structure basis of ferroelectricity in the bismuth titanate family, Mater.
Maaoui, Structure distortion and dielectric properties of Sr1-x(Na0.5Bi0.5)xBi2Nb2O9 (x=0.0, 0.2, 0.5, 0.8 and 1.0), J.
Online since: March 2010
Authors: R.F. Zhuo, X. Y. Xu, H. T. Feng, D. Yan, H. J. Li, S. Cheng, Peng Xun Yan
Yan
1,2,b
1
Department of Physics, Lanzhou University, Lanzhou, 730000, China
2
Key Laboratory of Solid Lubrication, Institute of Chemistry and Physics, Chinese Academy of
Science, Lanzhou, 730000, China
a
zhuorf@lzu.edu.cn, bpxyan@lzu.edu.cn
Keywords: Nanostructures, Chemical vapor deposition processes, Nucleation, Optical properties
Abstract.
Both ZnO nanocomb and nanotetrapod structures have been synthesized via a simple chemical vapor deposition process in a horizontal tube furnace.
Among all these different structures, ZnO comb and tetrapod like structures are of interest for nanocomb biosensors, nanocantilever arrarys, gratings, Laser arrays, field emission devices, gas sensors, and solar cells [1-10] etc.
This letter focuses on both comb-like and tetrapod-like structures of ZnO crystal and evolutive process of them.
The (0001) planes are the preferable growth planes of ZnO wurtzite structure, therefore, a tetrahedral-shaped structure with four legs is presented.
Both ZnO nanocomb and nanotetrapod structures have been synthesized via a simple chemical vapor deposition process in a horizontal tube furnace.
Among all these different structures, ZnO comb and tetrapod like structures are of interest for nanocomb biosensors, nanocantilever arrarys, gratings, Laser arrays, field emission devices, gas sensors, and solar cells [1-10] etc.
This letter focuses on both comb-like and tetrapod-like structures of ZnO crystal and evolutive process of them.
The (0001) planes are the preferable growth planes of ZnO wurtzite structure, therefore, a tetrahedral-shaped structure with four legs is presented.
Online since: May 2014
Authors: Jing Heng Deng, Kan Ping Yu, Jian Guo Xie
Hierarchical structures nanomaterials exhibit improved performance.
The solvent thermal process is an important wet chemistry synthesis method and has been widely used to prepare various nanomaterials or nanocomposites.
Results and Discussion Phase Structures and Compositions.
Compared to the conventional Fe3O4/MWNTs structure, the novel Fe3O4/ MWNTs composite has a hierarchical structure, where the 1D MWNTs as back bones.
This process is easy to control hierarchical structure.
The solvent thermal process is an important wet chemistry synthesis method and has been widely used to prepare various nanomaterials or nanocomposites.
Results and Discussion Phase Structures and Compositions.
Compared to the conventional Fe3O4/MWNTs structure, the novel Fe3O4/ MWNTs composite has a hierarchical structure, where the 1D MWNTs as back bones.
This process is easy to control hierarchical structure.
Online since: June 2014
Authors: Randi Holmestad, Calin Daniel Marioara, Quentin M. Ramasse, Despoina Maria Kepaptsoglou, Fredrik S. Hage, Sigurd Wenner, Williams Lefebvre
Only recently, the complex structures of the Al–Zn–Mg hardening precipitates have been solved by HAADF–STEM imaging and first-principles calculations.
However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions.
The structure of the η phase was solved by X-ray diffraction in 1980 [2], but modeling its precursor η’ has proven a greater challenge.
Hints of some internal structure are however visible in Al maps from other metastable precipitates, confirming the presence of Al inside of them.
An η precipitate is shown in Fig. 2, together with the bulk structure of the phase [2].
However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions.
The structure of the η phase was solved by X-ray diffraction in 1980 [2], but modeling its precursor η’ has proven a greater challenge.
Hints of some internal structure are however visible in Al maps from other metastable precipitates, confirming the presence of Al inside of them.
An η precipitate is shown in Fig. 2, together with the bulk structure of the phase [2].
Study of Softening Temperature Range of Agglomerate Depending on its Structure and Phase Composition
Online since: December 2023
Authors: Andrey N. Dmitriev, Elena A. Vyaznikova, Galina Yu. Vitkina, Roman V. Alektorov
Study of Softening Temperature Range of Agglomerate Depending on its Structure and Phase Composition
A.N.
The quality of sinter is closely related to its structure, porosity, and mineral phase distribution.
According to the search results, the softening temperature range of agglomerate depends on its structure and phase composition.
Alektorov, Study of the strength characteristics of agglomerate depending on its structure and phase composition, Defect and Diffusion Forum, 420 (2022), 63-72
Webster, A review of the chemistry, structure and formation conditions of silico-ferrite of calcium and aluminum (‘SFCA’) phases, ISIJ International, 58-12 (2018), 2157-2172
The quality of sinter is closely related to its structure, porosity, and mineral phase distribution.
According to the search results, the softening temperature range of agglomerate depends on its structure and phase composition.
Alektorov, Study of the strength characteristics of agglomerate depending on its structure and phase composition, Defect and Diffusion Forum, 420 (2022), 63-72
Webster, A review of the chemistry, structure and formation conditions of silico-ferrite of calcium and aluminum (‘SFCA’) phases, ISIJ International, 58-12 (2018), 2157-2172
Online since: August 2012
Authors: Ana Lúcia Diegues Skury, Guerold Sergueevitch Bobrovinitchii, Sérgio Neves Monteiro, Luciana Lezira Pereira Almeida
These two graphite structures can be experimentally distinguished by means of X ray diffraction (XRD) analysis [3].
Table 2 presents quantitative results of the existing phases in the graphite structure using the Rietveld method.
Proportion and dispersion of rhombohedral sequences in the hexagonal structure of graphite powders.
Koksbang, Structure and lithium intercalation properties of synthetic and natural graphite.
Kleinschmitt, Carbon graphite, Ullmann’s encyclopedia of industrial chemistry, sixth ed., Electronic Release (2002)
Table 2 presents quantitative results of the existing phases in the graphite structure using the Rietveld method.
Proportion and dispersion of rhombohedral sequences in the hexagonal structure of graphite powders.
Koksbang, Structure and lithium intercalation properties of synthetic and natural graphite.
Kleinschmitt, Carbon graphite, Ullmann’s encyclopedia of industrial chemistry, sixth ed., Electronic Release (2002)