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Online since: October 2011
Authors: Takuzo Aida, Hendrik O. Lintang, Kazushi Kinbara
Lintang1,2,a*, KAZUSHI Kinbara3,b, and Takuzo Aida2,c
1Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, UTM Skudai, Johor 81310, Malaysia.
2Department of Chemistry and Biotechnology, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8656, Japan.
3Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Since desired functions can be tailored by organic motifs and their organic assembled structures can be immobilized by inorganic framework, certain performances of organic motifs can be enhanced due to site isolation or long-range molecular ordering [2].
Recently, we have successfully fabricated mesoporous silica nanocomposite with a hexagonal structure [Au3Pz3]/silicahex using columnar assembly of [Au3Pz3], formed via a weak AuI-AuI metallophilic interaction, as a template [11-13].
Interestingly, when the molar ratio of TBOS to [Au3Pz3] was decreased from 60:1 to as low as 20:1, a lamellar structure [Au3Pz3]/silicalam can be fabricated with an interlayer distance of 3.7 nm (Fig. 2B, a,b; d100 and d200 at 2q = 2.36º and 4.56º), where this structure was completely disrupted after calcination (Fig. 2B, c).
All these observations strongly demonstrate that the photochemical properties of [Au3Pz3] are essentially maintained in both hexagonal and lamellar structures.
Since desired functions can be tailored by organic motifs and their organic assembled structures can be immobilized by inorganic framework, certain performances of organic motifs can be enhanced due to site isolation or long-range molecular ordering [2].
Recently, we have successfully fabricated mesoporous silica nanocomposite with a hexagonal structure [Au3Pz3]/silicahex using columnar assembly of [Au3Pz3], formed via a weak AuI-AuI metallophilic interaction, as a template [11-13].
Interestingly, when the molar ratio of TBOS to [Au3Pz3] was decreased from 60:1 to as low as 20:1, a lamellar structure [Au3Pz3]/silicalam can be fabricated with an interlayer distance of 3.7 nm (Fig. 2B, a,b; d100 and d200 at 2q = 2.36º and 4.56º), where this structure was completely disrupted after calcination (Fig. 2B, c).
All these observations strongly demonstrate that the photochemical properties of [Au3Pz3] are essentially maintained in both hexagonal and lamellar structures.
Online since: March 2013
Authors: Han Jun Oh, Choong Soo Chi, Jong Ho Lee
To determine the crystal structure and the crystalline size, an XRD (Philips, PW1710) with a Cu kα radiation (λ=1.5406Å) was carried out.
The anodic titania films show porous cell structures resulting from an electric discharge spark due to the local film breakdown [4].
In the electrolyte temperature at 5oC, no obvious porous cell structure was detected, whereas for electrolyte temperature of 10oC, the surface morphologies of anodic titania exhibited an irregular porous cell structure.
As shown in Fig. 1, the porous cell structure on the anodic titania surface obviously exhibited with increasing electrolyte temperature.
The influence of electrolyte temperature on porous cell structure of anodic TiO2 prepared in 1.5 M H2SO4 / 0.5 M NH4NO3 solutions.
The anodic titania films show porous cell structures resulting from an electric discharge spark due to the local film breakdown [4].
In the electrolyte temperature at 5oC, no obvious porous cell structure was detected, whereas for electrolyte temperature of 10oC, the surface morphologies of anodic titania exhibited an irregular porous cell structure.
As shown in Fig. 1, the porous cell structure on the anodic titania surface obviously exhibited with increasing electrolyte temperature.
The influence of electrolyte temperature on porous cell structure of anodic TiO2 prepared in 1.5 M H2SO4 / 0.5 M NH4NO3 solutions.
Online since: April 2014
Authors: Rui Yang, Gui Quan Jiang, Jun Ma, Shi Yan Han, Jiu Yin Pang
It has fine internal 1D structure[17].
We considered that the structure of the anodic oxide membrane formed.
……Following formation of the film, the specimen film revealed the metal-oxide interface structure.
Lipid Tubules – A paradigm for molecularly engineered structures, Science ,262 (1993) 1669-1676
Nanomaterials in analytical chemistry.Anal.
We considered that the structure of the anodic oxide membrane formed.
……Following formation of the film, the specimen film revealed the metal-oxide interface structure.
Lipid Tubules – A paradigm for molecularly engineered structures, Science ,262 (1993) 1669-1676
Nanomaterials in analytical chemistry.Anal.
Online since: October 2014
Authors: Xi Du, Yu Chen Li, Da Xiang Nie, Ji Huang, You Liang Chen
Surface Morphology and Microscopic Structure of Concrete Samples: After high temperature burning, the concrete specimens had changed its physical structure to a great extent so that the analysis of the change of the outer structure of the concrete specimens can yield a rough understanding of its destruction mechanisms [4].
After the temperature variation, the physical and chemistry of polypropylene fiber reinforced concrete is basically identical to that of normal concrete.
At 600ºC, the samples face a considerable decomposition of the internal calcium hydroxide, a fact which results in a very disordered internal structure as can be seen in Fig.1c.
Thus, the calcium carbonate starts decomposing, a fact which heavily loosens the internal structure of the concrete and reflects in the significant loss of compressive strength.
Penttala: Effect of high temperature on the pore structure and strength of plain and polypropylene fiber reinforced cement pastes.
After the temperature variation, the physical and chemistry of polypropylene fiber reinforced concrete is basically identical to that of normal concrete.
At 600ºC, the samples face a considerable decomposition of the internal calcium hydroxide, a fact which results in a very disordered internal structure as can be seen in Fig.1c.
Thus, the calcium carbonate starts decomposing, a fact which heavily loosens the internal structure of the concrete and reflects in the significant loss of compressive strength.
Penttala: Effect of high temperature on the pore structure and strength of plain and polypropylene fiber reinforced cement pastes.
Online since: September 2013
Authors: Chun Hong Zhang, Ning Zhang, Yue Wang
Shearer picks are widely used in coal cutter for their simple structure and easy to make.
(a)1# (b)2# (c)3# Fig.5 Metallographic structure of the tooth body 40Cr before and after heat treatment process From Fig. 5 (a) it could be seen that the metallographic structure was ferrite and pearlite before heat treatment of tooth body 40Cr.
Fig. 5 (c) showed that the metallographic structure was tempered troostite after quenching and medium temperature tempering.
The organization was especially fine in tempered structure, grain refinement made the structure becomes uniform and the grain boundary area increase, so the plasticity and toughness of materials increased with the strength and hardness improving.
Materials Chemistry and Physics. 2009,118: 86-92
(a)1# (b)2# (c)3# Fig.5 Metallographic structure of the tooth body 40Cr before and after heat treatment process From Fig. 5 (a) it could be seen that the metallographic structure was ferrite and pearlite before heat treatment of tooth body 40Cr.
Fig. 5 (c) showed that the metallographic structure was tempered troostite after quenching and medium temperature tempering.
The organization was especially fine in tempered structure, grain refinement made the structure becomes uniform and the grain boundary area increase, so the plasticity and toughness of materials increased with the strength and hardness improving.
Materials Chemistry and Physics. 2009,118: 86-92
Online since: August 2012
Authors: Xiao Dong Hu, Yong Zhang, Jian Tao Lv, Sen Zhang
The mechanical properties of the weld seam have been tested and the metallurgical structures have been analyzed.
Introduction Q345R steel is widely used in petroleum chemistry industries as pressure vessel material with good mechanical properties [1, 2].
The metallurgical structure of Q345R steel has been studied in this paper with the procedure of welding operating, mechanical properties tests and the microscope structure analysis.
Points of 9, 10 and 11 have been chosen for the base plate metallurgical structure analysis, which have the similar organization with obvious band structure including the white ferrite and the black pearlite shown in Figure 3.
The structure of this position is just the same as the Figure 7.
Introduction Q345R steel is widely used in petroleum chemistry industries as pressure vessel material with good mechanical properties [1, 2].
The metallurgical structure of Q345R steel has been studied in this paper with the procedure of welding operating, mechanical properties tests and the microscope structure analysis.
Points of 9, 10 and 11 have been chosen for the base plate metallurgical structure analysis, which have the similar organization with obvious band structure including the white ferrite and the black pearlite shown in Figure 3.
The structure of this position is just the same as the Figure 7.
Online since: January 2009
Authors: Di Wang, Xiao Dong Chen, Li Jiang Hu, Yu Liu, Xuan Dong Li
The AT values of three films were in the order
of f-MPT>f-GPT>f-VPT due to complete-cage structures of building blocks (POSS) and the size of
organic branches covalently bonded to the silica network in the molecular structures.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the AA radiation from sunlight.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the UV-A radiation from sunlight.
The average transparency values of three films are in the order of f-MPT>f-GPT>f-VPT due to complete-cage structures of building blocks (POSS) and the size of organic branches covalently bonded to the silica network in the molecular structures.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the AA radiation from sunlight.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the AA radiation from sunlight.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the UV-A radiation from sunlight.
The average transparency values of three films are in the order of f-MPT>f-GPT>f-VPT due to complete-cage structures of building blocks (POSS) and the size of organic branches covalently bonded to the silica network in the molecular structures.
The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the AA radiation from sunlight.
Online since: January 2013
Authors: Matej Beznák, Alexander S. Chaus, J. Sojka, Ján Porubský
In order to meet these requirements, HSSs have special chemical compositions, and consequently, structures.
The volume fraction, size, morphology and pattern of distribution of the primary carbides, formed in the structure during primary solidification, have a very strong influence on the final properties of HSSs after their full heat treatments [3].
In as-cast HSSs, eutectic carbides form a network over the primary matrix grain boundaries that remains in the structure after quenching and tempering greatly affecting final mechanical properties [3].
As a consequence, a solidification structure of M2 HSS has been studied thoroughly.
The thermal stability of the eutectic carbides was shown to depend on their morphology that can be attributed to the chemical composition and the chemistry of these carbides, which are in the studied HSS M2C with lamellar and honeycomb-like morphologies and M6C fishbone one.
The volume fraction, size, morphology and pattern of distribution of the primary carbides, formed in the structure during primary solidification, have a very strong influence on the final properties of HSSs after their full heat treatments [3].
In as-cast HSSs, eutectic carbides form a network over the primary matrix grain boundaries that remains in the structure after quenching and tempering greatly affecting final mechanical properties [3].
As a consequence, a solidification structure of M2 HSS has been studied thoroughly.
The thermal stability of the eutectic carbides was shown to depend on their morphology that can be attributed to the chemical composition and the chemistry of these carbides, which are in the studied HSS M2C with lamellar and honeycomb-like morphologies and M6C fishbone one.
Online since: August 2014
Authors: Qiao Ping Liu, Shuo Jiang, Wei Xia Li, Yan Ning Yang
Study on the Field Emission of Titanium-based Nano-diamond Diode Structure by Electrophoretic Deposition
Qiaoping Liua, Yanning Yangb, Shuo Jiangc, Weixia Lid
College of Physics and Electronic Information, Yan’an University, Yan’an 716000, China
aliuqiaoping1211@126.com, byayyn@163.com, c1948702176@qq.com, dlwxxmk1990@163.com
Keywords: diamond; field emission cathode; electrophoretic deposition; heat treatment
Abstract.
A cathode process of nano-diamond field emission display based on diode structure by electrophoretic deposition has been explored.
[8] Shiratori Y, Hiraoka H,Yamamoto M, Vertically aligned carbon nanotubes produced by radio-frequency plasma-enhanced chemical vapor deposition at low temperature and their growth mechanism ,Materials Chemistry & Physics 87(2004)31-38
A cathode process of nano-diamond field emission display based on diode structure by electrophoretic deposition has been explored.
[8] Shiratori Y, Hiraoka H,Yamamoto M, Vertically aligned carbon nanotubes produced by radio-frequency plasma-enhanced chemical vapor deposition at low temperature and their growth mechanism ,Materials Chemistry & Physics 87(2004)31-38
Online since: October 2014
Authors: Lei Lei Qi
ZnO is the most abundant morphology in semiconductor materials for metal oxide, its photocatalytic performance dependent on the morphology and structure of ZnO, and has been reported to demonstrate a multi-level structure of ZnO micro nano materials that can exhibit better photocatalytic properties.
ZnO nano materials (1) The structure of the Zinc Oxide Zinc Oxide is a wide direct bandgap II-VI semiconductor material, there are three kinds of crystal structure, as shown in Figure 1 [7]: square rock salt, zinc blende structure and six wurtzite structure.
The rock salt structure exists only in the high pressure (8-12Gpa) Zinc Oxide preparation; zinc blende structure Zinc Oxide can only be obtained in the more pressure to; under normal temperature and pressure, Zinc Oxide in Wurtzite structure.
Fig.1 Schematic diagram of Zinc Oxide crystal structure A) Rock salt structure; b) zinc blende structure; c) wurtzite structure.
According to the classification method of International Union of pure and Applied Chemistry [5], adsorption isotherm in Figure belongs to the IV class, which can explain the existence of mesoporous many Zinc Oxide microspheres.
ZnO nano materials (1) The structure of the Zinc Oxide Zinc Oxide is a wide direct bandgap II-VI semiconductor material, there are three kinds of crystal structure, as shown in Figure 1 [7]: square rock salt, zinc blende structure and six wurtzite structure.
The rock salt structure exists only in the high pressure (8-12Gpa) Zinc Oxide preparation; zinc blende structure Zinc Oxide can only be obtained in the more pressure to; under normal temperature and pressure, Zinc Oxide in Wurtzite structure.
Fig.1 Schematic diagram of Zinc Oxide crystal structure A) Rock salt structure; b) zinc blende structure; c) wurtzite structure.
According to the classification method of International Union of pure and Applied Chemistry [5], adsorption isotherm in Figure belongs to the IV class, which can explain the existence of mesoporous many Zinc Oxide microspheres.