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Online since: October 2010
Authors: Gui Yang Liu, Jun Ming Guo, Bao Sen Wang, Yan Nan Li
A porous carbon prepared by using a mordenite mineral as template and
its cyclic voltammetry study in H2SO4
LIU Guiyang1, a, LI Yannan
2, b, GUO Junming
3, WANG Baosen
1
1
College of science, University of Honghe, Mengzi, Yunnan, 661100, China
2
Library of Honghe University, Mengzi, Yunnan, 661100, China
3
School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650031,
China
a
liuguiyang@tsinghua.org.cn, bliyannan1982@126.com
Keywords: super capacitor, templated carbon, cyclic voltammetry, mordenite mineral
Abstract.
X-ray diffraction (XRD), nitrogen adsorption, scanning electric microscope (SEM) and cyclic voltammetry (CV) are used to analyze the phase composition, pore structure, micro morphology and electrochemical performance.
The composition, pore structure and micro morphology of the templated carbon have been investigated, and the electrochemical performance in H2SO4 has also been studied in detail.
The pore structures of the samples were characterized by using nitrogen adsorption at -196 °C (ASAP 2010M, Micromeritics).
Pore structure.
X-ray diffraction (XRD), nitrogen adsorption, scanning electric microscope (SEM) and cyclic voltammetry (CV) are used to analyze the phase composition, pore structure, micro morphology and electrochemical performance.
The composition, pore structure and micro morphology of the templated carbon have been investigated, and the electrochemical performance in H2SO4 has also been studied in detail.
The pore structures of the samples were characterized by using nitrogen adsorption at -196 °C (ASAP 2010M, Micromeritics).
Pore structure.
Online since: August 2016
Authors: Francis Mulimbayan, Christian Mark Pelicano
Selected area diffraction(SAED) patternsconfirmed that the nanoparticles were of highly crystalline ZnO having wurtzitephase structure.The energy band gap values red-shifted from 3.79 to 3.64 eV based from excitonic absorption peaks.
The morphology and structure of the resulting nanoparticles were observed by transmission electron microscope (TEM) and selected area diffraction (SAED).
The SAED patternsshow diffractions rings corresponding to (100), (002), (101), (102), (110), (103) and (112) planes of wurtzite structure of ZnO and revealing the highly crystalline nature of the nanoparticles.
El-Sayed, Spectral Properties and Relaxation Dynamics of Surface Plasmon Electronic Oscillations in Gold and Silver Nanodots and Nanorods, Journal of Physical Chemistry B, 103 (1999) 8410-8426 [2] T.
,Increase of electroluminescent intensity in planar light-emitting diode structures based on PFO polymer – ZnO nanoparticles composite films operated by alternating-current voltages, Solid State Communications, 208 (2015) 41–44 [6] P.Z.
The morphology and structure of the resulting nanoparticles were observed by transmission electron microscope (TEM) and selected area diffraction (SAED).
The SAED patternsshow diffractions rings corresponding to (100), (002), (101), (102), (110), (103) and (112) planes of wurtzite structure of ZnO and revealing the highly crystalline nature of the nanoparticles.
El-Sayed, Spectral Properties and Relaxation Dynamics of Surface Plasmon Electronic Oscillations in Gold and Silver Nanodots and Nanorods, Journal of Physical Chemistry B, 103 (1999) 8410-8426 [2] T.
,Increase of electroluminescent intensity in planar light-emitting diode structures based on PFO polymer – ZnO nanoparticles composite films operated by alternating-current voltages, Solid State Communications, 208 (2015) 41–44 [6] P.Z.
Online since: January 2010
Authors: Xiang Zhong Ren, Qian Ling Zhang, Xi Li, Jian Hong Liu, Pei Xin Zhang
Preparation and Electrochemical Properties of LiFePO4/PPy Composite
Cathode Materials for Lithium-Ion Batteries
Xiangzhong Ren, Xi Li, Peixin Zhang, Jianhong Liu, Qianling Zhang
School of Chemistry and Chemical Engineering,
Shenzhen University, Shenzhen 518060, China
Keywords: LiFePO4; Polypyrrole; Lithium ion battery; doping; solid state; composite
Abstract.
The results showed that doped PPy did not destroy the olivine structure of LiFePO4 but decreased the intensity of the diffraction peaks, and PPy was found on the surface of LiFePO4 particles.
The final products were then filtered, washed with deionized water, and dried at 70°C in a vacuum oven for 24h. 2.2 Measurements The crystal structure of the LiFePO4/PPy composites was evaluated by X-ray diffraction(XRD) methods using Cu Kα radiation (BRUKER D8 ADVANCE, Germany).The X-ray diffraction data were corrected in the angle interval from 10° to 60° (2θ) at step of 1.2°/min.
All the patterns can be indexed to a single-phase material, having an orthorhombic olivine-type structure (space group Pmnb).
It indicates that LiFePO4 maintains the intrinsic crystalline structure of orthorhombic olivine- type after the doping of PPy.
The results showed that doped PPy did not destroy the olivine structure of LiFePO4 but decreased the intensity of the diffraction peaks, and PPy was found on the surface of LiFePO4 particles.
The final products were then filtered, washed with deionized water, and dried at 70°C in a vacuum oven for 24h. 2.2 Measurements The crystal structure of the LiFePO4/PPy composites was evaluated by X-ray diffraction(XRD) methods using Cu Kα radiation (BRUKER D8 ADVANCE, Germany).The X-ray diffraction data were corrected in the angle interval from 10° to 60° (2θ) at step of 1.2°/min.
All the patterns can be indexed to a single-phase material, having an orthorhombic olivine-type structure (space group Pmnb).
It indicates that LiFePO4 maintains the intrinsic crystalline structure of orthorhombic olivine- type after the doping of PPy.
Online since: April 2021
Authors: Johnson Olumuyiwa Agunsoye, Sefiu Adekunle Bello, Nasirudeen Kolawole Raji, Jeleel Adekunle Adebisi, Isiaka Ayobi Raheem, Suleiman Bolaji Hassan
Structure is the most important part of the material because the material properties have a good relationship with the material structure.
Moreover, the materials responses to loads depend on the structure of the materials [1-3].
Understanding chemistry of cross-linking reaction leading to infusible epoxy structure is paramount to proper design and development of structural epoxy composite.
Addition of aluminium particles to epoxy led to the formation of relatively ordered composite structures.
Austin, Textbook of Practical Organic Chemistry,5th, John Wiley& Sons, New York, 1989
Moreover, the materials responses to loads depend on the structure of the materials [1-3].
Understanding chemistry of cross-linking reaction leading to infusible epoxy structure is paramount to proper design and development of structural epoxy composite.
Addition of aluminium particles to epoxy led to the formation of relatively ordered composite structures.
Austin, Textbook of Practical Organic Chemistry,5th, John Wiley& Sons, New York, 1989
Online since: February 2013
Authors: Aissa Boudjella
Box: 25669
Bircham International University Madrid, Spain
boudjellaa@hotmail.com a.boudjella@khawarizmi.com
Keywords: MAS, temperature, HOMO, LUMO, HLG, conductance gap, p-orbital interactions
Abstract: Numerical simulations have been performed to study the effect of the temperature T on the electronic transport through a small group of molecular assembly system (MAS) by presenting I-V and G-V characteristics analysis for different geometry structures.
Recently, the alkannethiol self assembled monolayers (SAM) have been investigated using a device structure that enables the temperature dependent current-voltage characteristics I (V, T) measurement [12,13,14,15,16,17,18].
At given MAS structure with constant d, the simulation results show that when T increases, the conductance gap as well as the threshold voltage are reduced.
The results indicate that in addition to the MAS geometrical structure, the temperature rise effect is an important factor in determining the current flow, particularly in the conductance gap and in the linear region.
Essential of compu chemistry: (Oxford Univ.
Recently, the alkannethiol self assembled monolayers (SAM) have been investigated using a device structure that enables the temperature dependent current-voltage characteristics I (V, T) measurement [12,13,14,15,16,17,18].
At given MAS structure with constant d, the simulation results show that when T increases, the conductance gap as well as the threshold voltage are reduced.
The results indicate that in addition to the MAS geometrical structure, the temperature rise effect is an important factor in determining the current flow, particularly in the conductance gap and in the linear region.
Essential of compu chemistry: (Oxford Univ.
Online since: September 2006
Authors: Kenichi Myoujin, Koji Nakane, Takashi Ogihara, Nobuo Ogata, Kazuya Higeta, Takayuki Kodera, Suetaka Omura, Masao Uede
The crystal phase of Li�Ni1/3Mn1/3Co1/3�O2 was resulted in layered
rock salt structure with R3m space group.
Although the theoretical capacity of spinel LiMn2O4 is much lower than those of layered structures such as LiCoO2 and LiNiO2.
Both the crystal phase of calcined powders were resulted in layered rock salt structure with R3m space group.
The crystal phase of Li�Ni1/3Mn1/3Co1/3�O2 was resulted in layered rock salt structure with R3m space group after calcinations at 1023 K, 2 h.
Hirai, Chemistry Express, 7 (1992) , p. 193
Although the theoretical capacity of spinel LiMn2O4 is much lower than those of layered structures such as LiCoO2 and LiNiO2.
Both the crystal phase of calcined powders were resulted in layered rock salt structure with R3m space group.
The crystal phase of Li�Ni1/3Mn1/3Co1/3�O2 was resulted in layered rock salt structure with R3m space group after calcinations at 1023 K, 2 h.
Hirai, Chemistry Express, 7 (1992) , p. 193
Online since: September 2016
Authors: Pavlo Maruschak, Abdellah Menou, Sergey Panin, Andriy Buketov, Petro Stukhlyak
For a more detailed analysis of these processes we should consider the mechanism of the effect of fillers on the structure and properties of the ECM at the meso- and micro- levels.
It was shown earlier that a polymer layer near the phase boundary differs by its properties and structure from the bulk of polymer.
According to [6-10], the structure of polymer composites with the disperse filler is prone to self-organization with the formation of clusters.
The cluster structure is formed in the ECM.
Kuchin Epoxy composites modified with finely dispersed fillers, Russian Journal of Applied Chemistry 75 (2002) 636-640
It was shown earlier that a polymer layer near the phase boundary differs by its properties and structure from the bulk of polymer.
According to [6-10], the structure of polymer composites with the disperse filler is prone to self-organization with the formation of clusters.
The cluster structure is formed in the ECM.
Kuchin Epoxy composites modified with finely dispersed fillers, Russian Journal of Applied Chemistry 75 (2002) 636-640
Online since: April 2008
Authors: Yuan Man, Xian Kui Li, La Dao Yang
Then metallurgical structures were observed.
Then metallurgical structures were observed.
A kind of common straight carbon steel was chosen and its chemistry components are shown in Table 1.
Table 1 Chemistry components of the material in experiments [mass %].
We made metallurgical structures observed samples from the water-cooled experimental samples.
Then metallurgical structures were observed.
A kind of common straight carbon steel was chosen and its chemistry components are shown in Table 1.
Table 1 Chemistry components of the material in experiments [mass %].
We made metallurgical structures observed samples from the water-cooled experimental samples.
Online since: September 2016
Authors: Vyacheslav B. Dementyev, T.N. Ivanova
Investigation of the Surface Layer Structure of High-Chromium and High-Strength Steels at the Variation of the Heating Temperature
V.B.
The investigation has been conducted of the surface layer structure of high-strength and high-chromium steels during high-speed heating – grinding.
These structures and the intermediate breakdown products have different density: the martensite has a lower density than austenite.
Ivanova, Investigation of the surface layer structure at grinding, Metal treatment, Equipment, Tools. 3 (2005) 30-32
Belukhin, Interrelation between height parameters of roughness at flat infeed grinding of steel 12-Cr18-Ni10-Ti, Physics, chemistry and mechanics of tribosystems. 9 (2010) 48-53
The investigation has been conducted of the surface layer structure of high-strength and high-chromium steels during high-speed heating – grinding.
These structures and the intermediate breakdown products have different density: the martensite has a lower density than austenite.
Ivanova, Investigation of the surface layer structure at grinding, Metal treatment, Equipment, Tools. 3 (2005) 30-32
Belukhin, Interrelation between height parameters of roughness at flat infeed grinding of steel 12-Cr18-Ni10-Ti, Physics, chemistry and mechanics of tribosystems. 9 (2010) 48-53
Online since: January 2024
Authors: Pisutti Dararutana, Watcharagon Wongkamjan, Patompong Chananil, Krit Won-In, Chatdanai Boonruang
Chiang Mai University (Department of Industrial Chemistry at Faculty of Science), Assist.
Wondraczek, Structure and properties of alkali and silver sulfophosphate glasses, J.
Pual, Chemistry of Glasses, second ed., Chapman & Hall, New York, 1990
Shelby, Introduction to Glass Science and Technology, The Royal Society of Chemistry, Cambridge, 2005
Wondraczek, Structure and properties of alkali and silver sulfophosphate glasses, J.
Pual, Chemistry of Glasses, second ed., Chapman & Hall, New York, 1990
Shelby, Introduction to Glass Science and Technology, The Royal Society of Chemistry, Cambridge, 2005