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Online since: February 2008
Authors: Qiang Xu, Fu Chi Wang, Hong Song Zhang, Ling Liu
Pyrochlore structure oxide (La0.5Sm0.5)2(Zr0.9Ce0.1)2O7 was prepared by mixing the appropriate
amounts of ZrO2, La2O3, Sm2O3 and CeO2, followed by reacting at 1600°C for 10 h.
Therefore, pure SLZCO ceramic with pyrochlore structure was synthesized by solid reaction.
The defect chemistry due to doping can be expressed using Kroger-Vink notation as following equation.
Therefore, pure SLZCO ceramic with pyrochlore structure was synthesized by solid reaction.
The defect chemistry due to doping can be expressed using Kroger-Vink notation as following equation.
Online since: December 2003
Authors: A.F. Çakır, B. Kepenek, U.Ö.Ş. Seker, M. Ürgen, C. Tamerler
Applied magnetic focusing
provided anatase crystal structure at all substrate temperatures.
XRD patterns of crystal structures belonging to the films prepared with magnetic focusing on stainless steel substrates are shown in Fig. 1.
Films prepared with magnetic focusing at all temperatures exhibited anatase structure.
However, this increase in the deposition rate affects nucleation process and causes formation of defective structures.
Zhao, Materials Chemistry and Physics, Vol. 69 (2001), p. 25-29
XRD patterns of crystal structures belonging to the films prepared with magnetic focusing on stainless steel substrates are shown in Fig. 1.
Films prepared with magnetic focusing at all temperatures exhibited anatase structure.
However, this increase in the deposition rate affects nucleation process and causes formation of defective structures.
Zhao, Materials Chemistry and Physics, Vol. 69 (2001), p. 25-29
Online since: January 2015
Authors: Guo Biao Li, Jun Mu Ke, Hua Ji Zhang
Urine can be diffused adequately in the absorption core layer by fluff pulp because of the long fiber and capillary structure of fluff pulp.
It can be seen a lot of small holes and unique mesh structure on poly-acrylate SAP surface.
With a large number of strong hydrophilic groups and three-dimensional network structure, it can absorb and hold plenty of liquid.
However, many long and thin stripes and the capillary structure of fluff pulp can accelerate diffusion of normal saline.
Industrial and Engineering Chemistry Research, 51(2012), p. 14941-14948 [5] Yongjian Xu, Lingmei Jing.
It can be seen a lot of small holes and unique mesh structure on poly-acrylate SAP surface.
With a large number of strong hydrophilic groups and three-dimensional network structure, it can absorb and hold plenty of liquid.
However, many long and thin stripes and the capillary structure of fluff pulp can accelerate diffusion of normal saline.
Industrial and Engineering Chemistry Research, 51(2012), p. 14941-14948 [5] Yongjian Xu, Lingmei Jing.
Online since: June 2012
Authors: Yu Qin Zhu
The Numerical Simulation of Flow Characteristics in T-type Pipe
Yuqin ZHU
School of Chemistry & Chemical Engineering, Xian Shiyou University, Xian, China
zhuyq@xsyu.edu.cn
Keywords: Headers; Manifolds; Numerical simulation; T-type pipe
Abstract.
Numerical Calculation Models Structure Models and Simulation Parameters Manifolds are composed of the system of distributing header(distributing header and branches) and the one of collecting header(collecting header and branches).The phenomena of fluid flow in the manifolds are very complex, the flow characteristics are closely relative to the structure of manifolds and flow parameters.
Its structure is Z-type manifolds with radial inlet mode, and the structural parameters are shown in Fig.1.
Fig.1 Structure schematic diagram of manifolds Fig.2 Structure schematic diagram of T-type pipe Water under normal temperature and pressure conditions is taken as simulated medium, the mass flow rate of the inlet pipe ranges from 500 kg/(m2·s) to 2000kg/(m2·s), the tube pitch is 178 mm and the length of branch pipe of manifolds ranges from 287 mm to 2870 mm.
GAMBIT Grid Model and Discrete Scheme The 3-D grid model of a T-type pipe is established by GAMBIT of Fluent software, both the structured and unstructured tetrahedral grids are used, and the grid spacing is 4 mm.
Numerical Calculation Models Structure Models and Simulation Parameters Manifolds are composed of the system of distributing header(distributing header and branches) and the one of collecting header(collecting header and branches).The phenomena of fluid flow in the manifolds are very complex, the flow characteristics are closely relative to the structure of manifolds and flow parameters.
Its structure is Z-type manifolds with radial inlet mode, and the structural parameters are shown in Fig.1.
Fig.1 Structure schematic diagram of manifolds Fig.2 Structure schematic diagram of T-type pipe Water under normal temperature and pressure conditions is taken as simulated medium, the mass flow rate of the inlet pipe ranges from 500 kg/(m2·s) to 2000kg/(m2·s), the tube pitch is 178 mm and the length of branch pipe of manifolds ranges from 287 mm to 2870 mm.
GAMBIT Grid Model and Discrete Scheme The 3-D grid model of a T-type pipe is established by GAMBIT of Fluent software, both the structured and unstructured tetrahedral grids are used, and the grid spacing is 4 mm.
Online since: June 2007
Authors: Jong Ho Lee, Choong Soo Chi, Han Jun Oh, Yong Soo Jeong, Hyung Seon Choi
The anodic TiO2 film formed in HF electrolyte
consists of nano-tubular structure, and these TiO2 films for photocatalyst have an advantage of high
specific surface area for photocatalytic reaction.
It is also well known that the titania has three kinds of crystal structures, among which anatase-type TiO2 crystal structure shows more effective for photocatalytic reaction than the others.
For this purpose the anodic titania film was heat treated at 550o C for 1 h, and the transition of crystal structure and photocatalytic efficiency have been investigated.
Crystal structure of anodic TiO2 layer for photocatalyst.
Such a high efficiency of catalytic reaction may be attributed to predominant presence of the anatase-type structure in the anodic film.
It is also well known that the titania has three kinds of crystal structures, among which anatase-type TiO2 crystal structure shows more effective for photocatalytic reaction than the others.
For this purpose the anodic titania film was heat treated at 550o C for 1 h, and the transition of crystal structure and photocatalytic efficiency have been investigated.
Crystal structure of anodic TiO2 layer for photocatalyst.
Such a high efficiency of catalytic reaction may be attributed to predominant presence of the anatase-type structure in the anodic film.
Online since: August 2018
Authors: Marvin U. Herrera, James Christian M. Dizon, Ivy R. Colambo, Alvin Karlo Garcia Tapia
One of the most commonly used coupling agent to link inorganic and organic structure is silane.
The peak at 1380 and 1321 cm-1 are associated to the presence of C-N bonds from the amine structure.
The amine structure links the benzenoid ring to the body of the silane molecules.
Lastly, by successfully combining the two material, a core-shell structure was formed.
Materials Chemistry and Physics. 99 (2006) 382-387 [11] Haq, A N U, et al.
The peak at 1380 and 1321 cm-1 are associated to the presence of C-N bonds from the amine structure.
The amine structure links the benzenoid ring to the body of the silane molecules.
Lastly, by successfully combining the two material, a core-shell structure was formed.
Materials Chemistry and Physics. 99 (2006) 382-387 [11] Haq, A N U, et al.
Online since: May 2021
Authors: Viktor V. Ovchinnikov, Irina A. Kurbatova, Elena Vladimirovna Luk'yanenko
The article presents studies of the structure and phase composition of aluminum alloys after ion implantation.
The structure of the irradiated samples was analyzed in two sections - parallel and perpendicular to the sample surface.
Also, the structure is determined by the heating temperature during implantation - 200 ºС.
Irradiation of the cold-worked clad 1565chN alloy with copper and lead ions does not lead to a fundamental change in its structure as compared to that existing in the deformed state: the cellular dislocation structure is preserved.
Zhukova, Physics and chemistry of material processing. 1 (1998)
The structure of the irradiated samples was analyzed in two sections - parallel and perpendicular to the sample surface.
Also, the structure is determined by the heating temperature during implantation - 200 ºС.
Irradiation of the cold-worked clad 1565chN alloy with copper and lead ions does not lead to a fundamental change in its structure as compared to that existing in the deformed state: the cellular dislocation structure is preserved.
Zhukova, Physics and chemistry of material processing. 1 (1998)
Online since: March 2017
Authors: Maciej Tydda, Jan Wawryszczuk, Bożena Zgardzińska
Investigation of Micro-Sized Capsules at High Pressure
by PALS Method
Bożena Zgardzińska1, a *, Maciej Tydda1,b and Jan Wawryszczuk1,c
1Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin, Poland
abozena.zgardzinska@poczta.umcs.lublin.pl, bmaciej.tydda@gmail.com, cjan@poczta.umcs.lublin.pl
Keywords: microcapsules, core-shell structure, ortho-positronium, Micronal DS5001X, pressure, argon
Abstract.
Internal structure of the microcapsules was observed by SEM.
Schrader (Eds.), Positron and Positronium Chemistry, Chapter 3, Elsevier, Amsterdam 1988
Internal structure of the microcapsules was observed by SEM.
Schrader (Eds.), Positron and Positronium Chemistry, Chapter 3, Elsevier, Amsterdam 1988
Online since: October 2014
Authors: Kazimierz Reszka, Zbigniew Zurek, M. Szczypinski, Artur Jaron
Sniadeckich 2, PL
2,4 Cracow University of Technology, Institute of Inorganic Chemistry,
31-155 Krakow, str.
SEM images of the structures of oxide films obtained on FeCrAl steel, a - coated with Al nanofilm prior to oxidation, b-coated with Pt nanofilm prior to oxidation.
Structure of layer systems Observations made by the transmission electron microscope concerning the structures of oxide films showed that, in case of oxidation of steel with Al nanofilm, in direct contact with the steel substrate are whiskers theta Al2O3 (1.2) and solid crystals of alpha Al2O3 phase (3) (Fig. 3a).
TEM-BF images (bright field), a - structure of the oxide layer formed of the Al and steel system; 1, 2 - theta phase of Al2O3, 3 – alpha phase of Al2O3, b-structure of the oxide layer formed of the Pt and steel system; 1, 2,3,4 Pt particles inside the crystal oxide.
a b Fig.4 BF-TEM images (bright field), a - structure of oxide film formed of the bilayer Pt/Al system and steel, 1, 2-large Pt particles, 3, theta phase of Al2O3, 4 – alpha phase of Al2O3, b-structure of oxide film formed of the compositional Pt + Al system and steel; 1.2, Pt particles on the oxide crystal surface, the particles dispersed in the form of streaks are indicated by dashed lines.
SEM images of the structures of oxide films obtained on FeCrAl steel, a - coated with Al nanofilm prior to oxidation, b-coated with Pt nanofilm prior to oxidation.
Structure of layer systems Observations made by the transmission electron microscope concerning the structures of oxide films showed that, in case of oxidation of steel with Al nanofilm, in direct contact with the steel substrate are whiskers theta Al2O3 (1.2) and solid crystals of alpha Al2O3 phase (3) (Fig. 3a).
TEM-BF images (bright field), a - structure of the oxide layer formed of the Al and steel system; 1, 2 - theta phase of Al2O3, 3 – alpha phase of Al2O3, b-structure of the oxide layer formed of the Pt and steel system; 1, 2,3,4 Pt particles inside the crystal oxide.
a b Fig.4 BF-TEM images (bright field), a - structure of oxide film formed of the bilayer Pt/Al system and steel, 1, 2-large Pt particles, 3, theta phase of Al2O3, 4 – alpha phase of Al2O3, b-structure of oxide film formed of the compositional Pt + Al system and steel; 1.2, Pt particles on the oxide crystal surface, the particles dispersed in the form of streaks are indicated by dashed lines.
Online since: December 2012
Authors: Nor Aishah Jasli, Ramani Mayappan, Hamidi Abd Hamid
The Sn-8Zn-3Bi solder reacting with Cu substrate formed a single Cu5Zn8 intermetallic layer with a flat structure.
This Cu6Sn5 intermetallic has a scallop structure.
Wu: Materials Chemistry and Physics Vol. 123 (2010), p. 629-633
This Cu6Sn5 intermetallic has a scallop structure.
Wu: Materials Chemistry and Physics Vol. 123 (2010), p. 629-633