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Online since: January 2012
Authors: Pei Xin Zhang, Xiang Zhong Ren, Chuan Shi, Jian Hong Liu
Synthesis and Electrochemical Performance of LiV3O8/MWCNTs Cathode Material for Lithium-ion Batteries
Xiangzhong Rena, Chuan Shi b, Peixin Zhangc and Jianhong Liu d
College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, China
arenxz409@163.com, bsc261@163.com, cpxzhang2000@163.com, dliujh@szu.edu.cn
Keywords: Lithium-ion batteries.
Fig. 1 TG-DTA curves of the precursor of LiV3O8 XRD and the structure of materials.
Generally, the functional approach does not change the graphite structure of MWCNTs.
Fig.3 illustrates the influence of MWCNTs doping amount on crystal structure of LiV3O8/MWCNTs composite cathode material.
On the surface of LiV3O8, MWCNTs formed network structure, which can increase the surface area of materials.
Fig. 1 TG-DTA curves of the precursor of LiV3O8 XRD and the structure of materials.
Generally, the functional approach does not change the graphite structure of MWCNTs.
Fig.3 illustrates the influence of MWCNTs doping amount on crystal structure of LiV3O8/MWCNTs composite cathode material.
On the surface of LiV3O8, MWCNTs formed network structure, which can increase the surface area of materials.
Online since: June 2010
Authors: Jia You Feng, Xian Zhong Sun
TEM images showed that the SiNWs have rough and nanoporous
structures on the top side along axial directions.
Introduction Silicon nanowires (SiNWs) have received significant attention due to their novel chemistry and potential applications in lithium secondary batteries [1], solar cells [2], biosensors [3], optoelectrics [4, 5], electronics [5], and thermoelectrics [6].
The textured mc-Si structures were prepared by etching the as-cut wafers in a solution of HF/HNO3 [18].
HR-TEM images of SiNW with nanoporous structures are shown in Figs. 3(a)-(c).
The nanoporous structures were found on the top parts of the SiNW (zone A).
Introduction Silicon nanowires (SiNWs) have received significant attention due to their novel chemistry and potential applications in lithium secondary batteries [1], solar cells [2], biosensors [3], optoelectrics [4, 5], electronics [5], and thermoelectrics [6].
The textured mc-Si structures were prepared by etching the as-cut wafers in a solution of HF/HNO3 [18].
HR-TEM images of SiNW with nanoporous structures are shown in Figs. 3(a)-(c).
The nanoporous structures were found on the top parts of the SiNW (zone A).
Online since: February 2007
Authors: Iain R. Gibson, J.M.S. Skakle, J.A. Stephen
Gibson
1,2,c
1
Department of Chemistry, Meston Walk, University of Aberdeen, Aberdeen, AB24 3UE, UK
2
School of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen, AB25 2ZD, UK
a
j.a.stephen@abdn.ac.uk, bj.skakle@abdn.ac.uk, ci.r.gibson@abdn.ac.uk
Keywords: Hydroxyapatite, silicate, co-substitution, X-ray diffraction, silicon
Abstract.
Two different substitution mechanisms result in subtle differences in the crystal structure.
It is likely that this substitution limit is determined by a limiting number of hydroxyl groups that remain in the HA structure, and as this limit is passed for increasing x, the HA decomposes to form HA + TCP.
Compositions were also studied by Fourier transform infrared (FTIR) spectroscopy, using an MTech Photoacoustic cell, to determine the presence of silicate groups within the HA structure.
The two mechanisms had different effects on the HA structure and may therefore have different effects on cell response, which is currently being evaluated.
Two different substitution mechanisms result in subtle differences in the crystal structure.
It is likely that this substitution limit is determined by a limiting number of hydroxyl groups that remain in the HA structure, and as this limit is passed for increasing x, the HA decomposes to form HA + TCP.
Compositions were also studied by Fourier transform infrared (FTIR) spectroscopy, using an MTech Photoacoustic cell, to determine the presence of silicate groups within the HA structure.
The two mechanisms had different effects on the HA structure and may therefore have different effects on cell response, which is currently being evaluated.
Online since: September 2016
Authors: V.G. Perederiy, P.V. Sirotin, B.G. Gasanov
@gmail.com, cspv_61@mail.ru
Keywords: structuring, diffusion coefficients, components, grain-size distribution, electron-probe test, homogenization
Abstract.
It has been revealed that Fe, Cr and Ni heterodiffusion coefficients are influenced not only by their own concentration, but also by structuring kinetics and the number and distribution of the graphite in charge.
At introduction of graphite (2.5 and 5.0 %) into Fe on interlaminar borders, perlitic structure zones with a cementite network has appeared.
In the Ni powder layer the austenitic structure has been formed on the grain borders of which a diffusive porosity has been observed.
Zhukhovitsky, Physical chemistry, Metallurgy, Moscow, 1987
It has been revealed that Fe, Cr and Ni heterodiffusion coefficients are influenced not only by their own concentration, but also by structuring kinetics and the number and distribution of the graphite in charge.
At introduction of graphite (2.5 and 5.0 %) into Fe on interlaminar borders, perlitic structure zones with a cementite network has appeared.
In the Ni powder layer the austenitic structure has been formed on the grain borders of which a diffusive porosity has been observed.
Zhukhovitsky, Physical chemistry, Metallurgy, Moscow, 1987
Online since: December 2016
Authors: Abdulwahab Giwa, Refiner Chikere Anene
Considering the chemistry of its production, FAME can be manufactured in a continuous process using reactive distillation process [6].
Main Flowsheet Development: The model structure was obtained from the Model Palette where FRACT 1 was selected from the RadFrac columns and material streams were used to pass the components into the equipment.
Bonilla-Petriciolet, Short-cut method for the design of reactive distillation columns, Industrial and Engineering Chemistry Research, 50 (2011) 10730–10743
Gmehling, Synthesis and Hydrolysis of methyl acetate by reactive distillation using structured catalytic packings: experiments and simulation, Industrial and Engineering Chemistry Research, 40 (2001) 1566–1574
Main Flowsheet Development: The model structure was obtained from the Model Palette where FRACT 1 was selected from the RadFrac columns and material streams were used to pass the components into the equipment.
Bonilla-Petriciolet, Short-cut method for the design of reactive distillation columns, Industrial and Engineering Chemistry Research, 50 (2011) 10730–10743
Gmehling, Synthesis and Hydrolysis of methyl acetate by reactive distillation using structured catalytic packings: experiments and simulation, Industrial and Engineering Chemistry Research, 40 (2001) 1566–1574
Online since: May 2021
Authors: Aji Gusti, Khoirina Dwi Nugrahaningtyas, Eddy Heraldy, Ferdinand Tri Aji Pamungkas
Hydrodeoxygenation of Anisole and Benzaldehyde Over Bifunctional CoMo/USY Catalyst
Khoirina Dwi Nugrahaningtyas1,a*, Eddy Heraldy1,b,
Ferdinand Tri Aji Pamungkas1,c, Aji Indo Sabiilagusti1,d
1Solid State and Catalysis Research Group, Chemistry Department, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Jl.
Zeolite is one kind of porous material that can substitute common support material, Al2O3, due to the high surface area, hydrothermal stability, and shape-selective by their pore structure [26–28].
Obuseng, A Review of the Chemistry, Structure, Properties and Applications of Zeolites, Am.
Medlin, Surface Chemistry of Aromatic Reactants on Pt- and Mo-Modi fi ed Pt Catalysts, (2016)
Zeolite is one kind of porous material that can substitute common support material, Al2O3, due to the high surface area, hydrothermal stability, and shape-selective by their pore structure [26–28].
Obuseng, A Review of the Chemistry, Structure, Properties and Applications of Zeolites, Am.
Medlin, Surface Chemistry of Aromatic Reactants on Pt- and Mo-Modi fi ed Pt Catalysts, (2016)
Online since: October 2010
Authors: Zhou Cheng Wang, Zheng Bing Qi, Dong Liang Peng, Ruo Xuan Huang, Fang Ping Zhu, Peng Sun, Chong Hu Wu
Fig.2 shows SEM images of cross-sectional morphology of ZrN coatings, it can be seen that the microstructure transits from non-columnar structure at 0.3 Pa to columnar structures at 0.5 Pa, 0.7 Pa and 0.9 Pa.
On one hand, the mobility energy of atoms increases with decreasing working pressure, causing non-columnar and denser structure as shown in Fig.2(a).
All coatings exhibit FCC phase structure with different preferred orientation, (111) orientation at 0.5 Pa, 0.7 Pa, 0.9 Pa and (200) preferred orientation at 0.3 Pa.
This is precisely what is observed from SEM cross-sectional morphologies of ZrN coatings, as the columnar structure at high working pressure and equiaxed structure at low working pressure.
The improved hardness and elastic modulus are attributed to increased compressive stress and dense structure.
On one hand, the mobility energy of atoms increases with decreasing working pressure, causing non-columnar and denser structure as shown in Fig.2(a).
All coatings exhibit FCC phase structure with different preferred orientation, (111) orientation at 0.5 Pa, 0.7 Pa, 0.9 Pa and (200) preferred orientation at 0.3 Pa.
This is precisely what is observed from SEM cross-sectional morphologies of ZrN coatings, as the columnar structure at high working pressure and equiaxed structure at low working pressure.
The improved hardness and elastic modulus are attributed to increased compressive stress and dense structure.
Online since: September 2011
Authors: Yun Yun Chu, Yu Chou Chao
Electrospinning is a viable method for forming porous structure materials with high surface area.
In our study, we developed a simple way of forming Ti02 with a porous structure.
A porous structured Ti02 film was then formed.
Even though as-spun fibers formed the fiber structure at electrospinning process.
[16] Seong Mu Jo, Mi Yeon Song, Young Rack Ahn, Chong Rae Park, Dong Young Kim: Journal of Macromolecular Science, Part A: Chemistry, Vol. 42(2005), p. 1529
In our study, we developed a simple way of forming Ti02 with a porous structure.
A porous structured Ti02 film was then formed.
Even though as-spun fibers formed the fiber structure at electrospinning process.
[16] Seong Mu Jo, Mi Yeon Song, Young Rack Ahn, Chong Rae Park, Dong Young Kim: Journal of Macromolecular Science, Part A: Chemistry, Vol. 42(2005), p. 1529
Online since: October 2011
Authors: Ming Liu, Xiao Li Liu, Wen Xiang Hu
China
2 Department of Chemistry, Capital Normal University, Beijing 100048, P.R.
For that purpose, there has been a lot of discussion on the structure-activity relationships(SAR) of 4PPs[9-12].
The 3D structures of these compounds were sketched with molecular modeling software package SYBYL 7.3.
The quite rigid structure was selected as the template for structural alignment to establish 3D-QSAR models here.
Rational explanations of the structure-activity relationship of these compounds were reached from the contour map.
For that purpose, there has been a lot of discussion on the structure-activity relationships(SAR) of 4PPs[9-12].
The 3D structures of these compounds were sketched with molecular modeling software package SYBYL 7.3.
The quite rigid structure was selected as the template for structural alignment to establish 3D-QSAR models here.
Rational explanations of the structure-activity relationship of these compounds were reached from the contour map.
Online since: March 2020
Authors: M.F. El-Shahat, Taha Mattar, Mostafa M.M. Sanad, Salwa M. Mohamed
The XRD results revealed a pure phase of spinel structure with particle size range 75-81 nm for the doped CMO samples.
The incorporation of different ions of Cu, Ni, Fe and Na into the CMOs structure showed a significant increase in the diffusivity of ions and remarkable improvement in the crystallinity.
Physical characterization: The phase structures of different samples have been identified using an X-ray diffractometer (XRD) (PANalytical X'Pert PRO).
It is obviously that cubic the spinel structure (ICDD card number 23-1237) phase was indexed in all samples with no sign of other phases being present.
Dopping with Fe,Cu,Ni and Na caused fusion and densification of crystals which is responsible for larger grain size, beside an increase in the porosity of spinel structure without any changes in morphology.
The incorporation of different ions of Cu, Ni, Fe and Na into the CMOs structure showed a significant increase in the diffusivity of ions and remarkable improvement in the crystallinity.
Physical characterization: The phase structures of different samples have been identified using an X-ray diffractometer (XRD) (PANalytical X'Pert PRO).
It is obviously that cubic the spinel structure (ICDD card number 23-1237) phase was indexed in all samples with no sign of other phases being present.
Dopping with Fe,Cu,Ni and Na caused fusion and densification of crystals which is responsible for larger grain size, beside an increase in the porosity of spinel structure without any changes in morphology.