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Online since: December 2013
Authors: Olga Kazmina, Anna Elistratova, Boris Semukhin
Lyakishev, Nanocrystalline structures – a novel perspective of construction material development.
Glass Physics and Chemistry 37 (2011) 29-36
Chukin, Surface chemistry and disperse silica structure.
Golubev, Hypomolecular structures of natural-ray amorphous materials.
Golubev, Scanning probe microscopy data on the globular structure of higher anthraxolites.
Glass Physics and Chemistry 37 (2011) 29-36
Chukin, Surface chemistry and disperse silica structure.
Golubev, Hypomolecular structures of natural-ray amorphous materials.
Golubev, Scanning probe microscopy data on the globular structure of higher anthraxolites.
Online since: May 2012
Authors: Wei Hua Chen, Jian Min Zhang, Heng Li
Influences of carbon-chain length of surfactants on mesoporous manganese oxides
Jian Min Zhanga, Heng Lib, Wei hua Chenc
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, China, 450001
azhjm@zzu.edu.cn, bliheng790919@126.com, cchenweih@zzu.edu.cn
Keywords: Mesoporous material, Manganese dioxide, Hydrothermal method
Abstract.
Typically, layered manganese oxides with nanoscale pore structure, high suface area and unique surface and tunnel structures exhibit excellent cation exchange and molecule adsorptive properties; they can be used as molecular sieves, catalysts, battery materials, especially when used as cathode materials for supercapacitors mainly because of its abundance in nature, cost and environmental friendliness [6–12].
X-ray diffraction (XRD) was used to analyze the crystal structures of as-synthesized samples and small angle X-ray diffraction(SAX) pattern was used to investigate the porous structure throughout the sample.
To further analyze the structure of the mesoporous materials obtained with different surtactants as templates, the nitrogen adsorption-desorption isotherms of them were measured.
The structure of samples were determined by XRD, SAX and BET analysis.
Typically, layered manganese oxides with nanoscale pore structure, high suface area and unique surface and tunnel structures exhibit excellent cation exchange and molecule adsorptive properties; they can be used as molecular sieves, catalysts, battery materials, especially when used as cathode materials for supercapacitors mainly because of its abundance in nature, cost and environmental friendliness [6–12].
X-ray diffraction (XRD) was used to analyze the crystal structures of as-synthesized samples and small angle X-ray diffraction(SAX) pattern was used to investigate the porous structure throughout the sample.
To further analyze the structure of the mesoporous materials obtained with different surtactants as templates, the nitrogen adsorption-desorption isotherms of them were measured.
The structure of samples were determined by XRD, SAX and BET analysis.
Online since: October 2010
Authors: Jing Shu, Xiao Jing Li, Da Biao Zhao
The structure of SAR was determined by FTIR.
Furthermore, the strong acidity will destroy the chain structure of cellulose.
Structure Analysis.
The structure of SAR was confirmed by FTIR: λ=1662cm-1(-O=C-NH-), 1455(=C-N-), 1017 and 1167(O-C-O).
Chemistry - A European Journal, Vol. 14(2008), p. 10396-10407
Furthermore, the strong acidity will destroy the chain structure of cellulose.
Structure Analysis.
The structure of SAR was confirmed by FTIR: λ=1662cm-1(-O=C-NH-), 1455(=C-N-), 1017 and 1167(O-C-O).
Chemistry - A European Journal, Vol. 14(2008), p. 10396-10407
Online since: December 2014
Authors: Dong Hui, Tao Yan, Peng Fei Jia, Yun Jia Liu, Zhan Zhan Qu
The real-time simulation system structure diagram si showm in figure 1.
IGBT module is used in power device, it has 6 IGBT which has three phase bridge structure.
As shown in figure 3(a), system structure mainly includes controlled voltage source, resistance, the characteristic curve fitting method and sampling detection circuit, etc.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
IGBT module is used in power device, it has 6 IGBT which has three phase bridge structure.
As shown in figure 3(a), system structure mainly includes controlled voltage source, resistance, the characteristic curve fitting method and sampling detection circuit, etc.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Online since: October 2021
Authors: Karel Dvořák, Dorothea Sklenářová, Dušan Dolák
After burning at 900 °C for 1 hour, the sample B still has the original structure of limestone with the beginnings of the formation of CaO crystals (Fig.2 a)).
After 3 hours of burning at 900 °C, the sample B has a good crystalline structure (Fig.2 c)).
In the porous structure, the diffusion of CO2 is easier, which means that the decarbonation process is faster [5].
This observation is in a good correspondence with the structure and the size of the CaO crystals obtained from the SEM images.
OATES, Lime and limestone: chemistry and technology.
After 3 hours of burning at 900 °C, the sample B has a good crystalline structure (Fig.2 c)).
In the porous structure, the diffusion of CO2 is easier, which means that the decarbonation process is faster [5].
This observation is in a good correspondence with the structure and the size of the CaO crystals obtained from the SEM images.
OATES, Lime and limestone: chemistry and technology.
Online since: March 2021
Authors: Lam Kok Wai, A.K.M. Moyeenul Huq, Mohd Fadhlizil Fasihi Mohd Aluwi, Kamal Rullah, Fatimah Salim
Introduction
It is known that the physicochemical, biological and toxicological properties of a compound are related to its unique molecular structure.
Figure 1: Chemical structure of prenylated pyrazolocurcumin derivative 1.
As from the structure of studied compound 1, the electron rich regions are at the ester moieties and the lone pair of the N-N pyrazole region.
Journal of Molecular Structure. 1196. 844-850
Journal of Molecular Structure. 1081. 51-61
Figure 1: Chemical structure of prenylated pyrazolocurcumin derivative 1.
As from the structure of studied compound 1, the electron rich regions are at the ester moieties and the lone pair of the N-N pyrazole region.
Journal of Molecular Structure. 1196. 844-850
Journal of Molecular Structure. 1081. 51-61
Online since: April 2009
Authors: Tatiana Yu. Kiseleva, Alla A. Novakova, Tatiana F. Grigorieva, M.I. Chistyakova, A.O. Polyakov, Tatiana S. Gendler
Introduction
Mechanochemical activation technique by ball milling has been widely used for the production of
various metastable structures including amorphous materials, solid solutions of immiscible
elements, and nanostructured materials [1].
The aim of our work was to study the influence of iron surplus on oxide destruction process causes the changes in the iron particles structure.
DSC curves reveal the broad exothermal effect at the temperature range up 450o C indicating structure reodering.
This amorphous structure has the high saturation magnetization and Curie temperature value about 430 o C and its amount is increased correspondingly to Fe-admixture in the initial composition.
Acknowledgements This work was performed under the aegis of RAS integration program № 8-15, "Fundamental Problems of the Physics and Chemistry of &anosized Systems and &anomaterials".
The aim of our work was to study the influence of iron surplus on oxide destruction process causes the changes in the iron particles structure.
DSC curves reveal the broad exothermal effect at the temperature range up 450o C indicating structure reodering.
This amorphous structure has the high saturation magnetization and Curie temperature value about 430 o C and its amount is increased correspondingly to Fe-admixture in the initial composition.
Acknowledgements This work was performed under the aegis of RAS integration program № 8-15, "Fundamental Problems of the Physics and Chemistry of &anosized Systems and &anomaterials".
Online since: March 2017
Authors: Mitch Irene Kate N. Galvan, Johanna Michelle Ambait, Leslie Joy L. Diaz, Joann A. Villarias, Miguel Lorenzo H. Yorro
SEM images in Figure 2 exhibits the flake-like layered structure of clays.
The exfoliated structure may provide higher surface area for filler-elastomer interaction.
Results showed that structure of clay greatly affects its reinforcing capability when used as filler in rubber compound.
Physics and Chemistry of Clay. 4th ed., Ernest Benn, London (1971) [2] Saki, N.J. et. al.
Datta and B. van Baarle, "Effect of Zinc Complexes as Activator for Sulfur Vulcanization in Various Rubbers," Rubber Chemistry and Technology, vol. 78, pp. 245-257, 2005.
The exfoliated structure may provide higher surface area for filler-elastomer interaction.
Results showed that structure of clay greatly affects its reinforcing capability when used as filler in rubber compound.
Physics and Chemistry of Clay. 4th ed., Ernest Benn, London (1971) [2] Saki, N.J. et. al.
Datta and B. van Baarle, "Effect of Zinc Complexes as Activator for Sulfur Vulcanization in Various Rubbers," Rubber Chemistry and Technology, vol. 78, pp. 245-257, 2005.
Online since: February 2012
Authors: Xue Lan Zhang, Deng Feng Wang
Synthesis of Diethyl Carbonate from Ethyl Carbamate and Ethanol Catalyzed by ZnO-Fe2O3 from Zn/Fe Hydrotalcite-like Compounds
Dengfeng Wang1, a, Xuelan Zhang2, b
1College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang, 277160, P.R.
China 2College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang, 277160, P.R.
Results and discussion Texture and structure of samples.
Generally speaking, the hydrotalcite structure could be depicted by two important values, a and c.
Therefore, the structure of the catalysts was correlated with the anneal temperature.
China 2College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang, 277160, P.R.
Results and discussion Texture and structure of samples.
Generally speaking, the hydrotalcite structure could be depicted by two important values, a and c.
Therefore, the structure of the catalysts was correlated with the anneal temperature.
Online since: October 2002
Authors: Antoni Budniok, Andrzej Serek
Masumoto, Physics Chemistry & Metallurgy, Japan 28,2 (1990).
3) D.
(Poland) New Electrode Materials Containing Titanium Powder in The Amorphous Matrix of Ni-P Antoni Budniok and Andrzej Serek Institute of Physics and Chemistry of Metals, University of Silesia, 40-007 Katowice, Bankowa 12, Poland Keywords: electrode materials, composite coatings, titanium.
The aim of our work was to obtain Ni-P-Ti layers by electrolytic codeposition of nickel and metal powder from the nickel bath containing the suspension of metal powder, to determine their structure, surface morphology, phase and chemical composition, and also to evaluate their suitability as electrode materials for electrolytic hydrogen evolution in an alkaline environment.
The surface of Ni-P alloys is characterised by the island structure and the presence of microcracks.
(Poland) New Electrode Materials Containing Titanium Powder in The Amorphous Matrix of Ni-P Antoni Budniok and Andrzej Serek Institute of Physics and Chemistry of Metals, University of Silesia, 40-007 Katowice, Bankowa 12, Poland Keywords: electrode materials, composite coatings, titanium.
The aim of our work was to obtain Ni-P-Ti layers by electrolytic codeposition of nickel and metal powder from the nickel bath containing the suspension of metal powder, to determine their structure, surface morphology, phase and chemical composition, and also to evaluate their suitability as electrode materials for electrolytic hydrogen evolution in an alkaline environment.
The surface of Ni-P alloys is characterised by the island structure and the presence of microcracks.