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Online since: March 2016
Authors: Shi Chun Li, Xiao Hong Xiao
The structure type of CaNb2Bi2O9, J.
The crystal chemistry and dielectric properties of the Aurivillius family of complex bismuth oxides with perovskite-like layered structures, J.
Journal of Solid State Chemistry. 164(2) (2002) 280-291
Dielectric classification of crystal structures, ionization potentials, and band structures, J.
Materials Chemistry and Physics. 113(1) (2009) 145-149
The crystal chemistry and dielectric properties of the Aurivillius family of complex bismuth oxides with perovskite-like layered structures, J.
Journal of Solid State Chemistry. 164(2) (2002) 280-291
Dielectric classification of crystal structures, ionization potentials, and band structures, J.
Materials Chemistry and Physics. 113(1) (2009) 145-149
Online since: March 2015
Authors: Xiao Yan Zhao, Xiao Fei Guo, Chao Zhang, Yue Ma
The secondary structure was evaluated by the Fourier transform infrared spectra.
Calculation of secondary structure.
The secondary structure of the specimen was calculated based on its amide I.
The area of each peak was correlated with the content of the assigned structure.
National Institute of Standards and Technology Chemistry Web Book: (2003), p
Calculation of secondary structure.
The secondary structure of the specimen was calculated based on its amide I.
The area of each peak was correlated with the content of the assigned structure.
National Institute of Standards and Technology Chemistry Web Book: (2003), p
Online since: December 2013
Authors: Zhong Xu Dai, Hui Zhan, Jin Yun Zou, Yun Hong Zhou
Influence of Acetylene Black Colloidal Solution on the Reactivation of the Simulation and Deactivation PbO2/PbSO4 Electrode
Zhong-xu Dai1,2, a, Hui Zhan2,b, * , Jin-yun Zou2,c and Yun-hong Zhou2,d
1College of Chemistry and Life Sciences, China Three Gorges University, Yichang China, 443002
2College of Chemistry and Molecular Sciences, Wuhan University, Wuhan China, 430072
adaizx@ctgu.edu.cn, b,*zhanhui3620@126.com (corresponding author)
Keywords: Acetylene black colloidal solution; PbO2/PbSO4 electrode; Regeneration.
ABC colloidal particles can be conducive to the structure improvement of the simulation deactivation PbO2/PbSO4 electrode.
It makes increase the proportion of micro holes gradually, and gradually formed the coral structure finally.
It can make the gap become bigger following the holes merger, the coral structure of the electrode can be destroyed as the progress of the charge and discharge cycles.
Therefore, ABC colloidal particles can be conducive to the improvement of the simulation deactivation PbO2/PbSO4 electrode structures.
ABC colloidal particles can be conducive to the structure improvement of the simulation deactivation PbO2/PbSO4 electrode.
It makes increase the proportion of micro holes gradually, and gradually formed the coral structure finally.
It can make the gap become bigger following the holes merger, the coral structure of the electrode can be destroyed as the progress of the charge and discharge cycles.
Therefore, ABC colloidal particles can be conducive to the improvement of the simulation deactivation PbO2/PbSO4 electrode structures.
Online since: May 2014
Authors: Ingole Sudeep, Paluri Rajeshwari
The boron based layered structure represents a possible solution.
AlB2 and B2O3 have hexagonal crystal structure.
AlB2 has layered crystal structure which is similar to layered molybdenum disulphide (MoS2).
Journal of Solid State Chemistry, 2004. 177(2): p. 389-394
The Journal of Physical Chemistry, 1996. 100(25): p. 10739-10745
AlB2 and B2O3 have hexagonal crystal structure.
AlB2 has layered crystal structure which is similar to layered molybdenum disulphide (MoS2).
Journal of Solid State Chemistry, 2004. 177(2): p. 389-394
The Journal of Physical Chemistry, 1996. 100(25): p. 10739-10745
Online since: May 2013
Authors: Bang Xu, Mo Chu, Ai Bang Hong, Feng Ling Zhang
Fig.1 Schematic diagram of the moving-bed apparatus
Results and discussion
Changes of composition and structure before and after sample binderless briquetting
The proximate and ultimate analysis of lignite and its briquette used for test are given in Table 1.
Briquetting basically has no effects on the chemical structure of samples, but the contents of oxygen functional groups are reduced in different degrees. bindless briquetting has no effect on composition and chemical structure, but change the surface structure of the lignite, and ultimately increase the volatile yield.
Coal chemistry [M].
Study of Structure and Components of Tar FromShenfu Coal [J].
Journal of Fuel Chemistry and Technology, 1995, 23 (1)
Briquetting basically has no effects on the chemical structure of samples, but the contents of oxygen functional groups are reduced in different degrees. bindless briquetting has no effect on composition and chemical structure, but change the surface structure of the lignite, and ultimately increase the volatile yield.
Coal chemistry [M].
Study of Structure and Components of Tar FromShenfu Coal [J].
Journal of Fuel Chemistry and Technology, 1995, 23 (1)
Online since: November 2017
Authors: Kateřina Opatová, Dagmar Bublíková, Bohuslav Mašek, Štěpán Jeníček
Fig. 1 Prior austenite grain identified in a martensitic matrix after Q&P processing
Fig. 2 Physical simulation in a thermomechanical simulator
Experimental Programme
For this experiment, three new experimental steels were created whose special chemistries lowered the Ms and Mf temperatures (Tab. 1).
These chemistries were developed with the aid of the JMatPro software which had been used for calculating the approximate transformation temperatures.
Discussion of Results In most of the steels, the Q&P process produced (at higher partitioning temperatures of 250– 400 °C) predominantly tempered martensitic-bainitic structures with certain fractions of retained austenite (Figs. 3–8).
Upon slower cooling at 0.5 °C/s, martensitic structure with a higher fraction of bainite and a certain amount of retained austenite was obtained (Figs. 9, 10).
In most cases, tempered structures of martensite, bainite and certain amounts of retained austenite were obtained.
These chemistries were developed with the aid of the JMatPro software which had been used for calculating the approximate transformation temperatures.
Discussion of Results In most of the steels, the Q&P process produced (at higher partitioning temperatures of 250– 400 °C) predominantly tempered martensitic-bainitic structures with certain fractions of retained austenite (Figs. 3–8).
Upon slower cooling at 0.5 °C/s, martensitic structure with a higher fraction of bainite and a certain amount of retained austenite was obtained (Figs. 9, 10).
In most cases, tempered structures of martensite, bainite and certain amounts of retained austenite were obtained.
Online since: April 2013
Authors: Zulkarnain Zainal, Mohd Zobir Hussein, Weetee Tan, Yingchin Lim
The nanotubes formed via anodisation growth allow a careful control over their structures uniformity, dimensions and pore size, obtaining structures vertically oriented from the surface.
At low voltage of 1 V, as seen in Fig. 1(a), no nanotubular structure can be observed.
As evidenced from the FESEM images in Fig. 1 (g) and (h), the anodised samples did not exhibit nanotubular structure; instead, a spongy-like structure with nanopores was formed.
Apparently, a mixture of tube-like structure at the upper part and porous structure at the lower part of the oxide layer was observed.
This mixture of structures gives rise to surface roughness which will increase the surface area.
At low voltage of 1 V, as seen in Fig. 1(a), no nanotubular structure can be observed.
As evidenced from the FESEM images in Fig. 1 (g) and (h), the anodised samples did not exhibit nanotubular structure; instead, a spongy-like structure with nanopores was formed.
Apparently, a mixture of tube-like structure at the upper part and porous structure at the lower part of the oxide layer was observed.
This mixture of structures gives rise to surface roughness which will increase the surface area.
Online since: June 2005
Authors: Dae Yong Shin, Beom Goo Lee, Hyun Jong Lee
The above results show that to increase the heavy metal ions removal capacities, the extraction
chemicals may swell the cell wall more than water does and remove the cell wall components as well
as extractives to change cell wall chemistry and architecture.
It shows that the swelling and exposing more xylose and lignin by breaking cell wall structure do play role in heavy metal ion removal.
Browning: Methods of Wood Chemistry (John Wiley & Sons, Inc., U.S.A. 1967)
It shows that the swelling and exposing more xylose and lignin by breaking cell wall structure do play role in heavy metal ion removal.
Browning: Methods of Wood Chemistry (John Wiley & Sons, Inc., U.S.A. 1967)
Online since: August 2017
Authors: Cecilia Demergasso, Pedro A. Galleguillos, Dina Cautivo, Ivan Nancucheo, Víctor J. Zepeda, C. Colipai, Milton Guillen, Enrique Becerra, Camila Escuti, Daniella González
The main objective of this work was to assess the use of flotation tailings and low-grade ore to biologically produce copper sulfide for further pyrometallurgical or fine chemistry processing.
The chemistry associated with the solubility of different metallic sulfides has allowed researchers to design novel strategies for the selective recovery of metals contained in acidic solutions [4,5,10,11].
The microbial structure of cultures used as inoculum for column tests was determined by qPCR.
The chemistry associated with the solubility of different metallic sulfides has allowed researchers to design novel strategies for the selective recovery of metals contained in acidic solutions [4,5,10,11].
The microbial structure of cultures used as inoculum for column tests was determined by qPCR.
Online since: August 2013
Authors: Xiang Zhu Zhou, Li Ya Wang, Yong Wei Wang, Gui Bo Gao, Ze Peng Chu, Yong Sheng Liu, Kai Yu Wang
Based on polycarboxylate chemistry, polycarboxylate superplasticizers (PCs) with hydrophobic side chains were synthesized through radical copolymerization reaction.
PCs have some advantages, such as the lower water/cement ratios, the controlling of molecular structure and the modulation of molecular weight.
From the structure of FM, the hydrophobic part of FM can be adsorbed on the surface [15], which is an entropy-driven spontaneous process [16].
Veazey: Handbook of chemistry and physics.
PCs have some advantages, such as the lower water/cement ratios, the controlling of molecular structure and the modulation of molecular weight.
From the structure of FM, the hydrophobic part of FM can be adsorbed on the surface [15], which is an entropy-driven spontaneous process [16].
Veazey: Handbook of chemistry and physics.