Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: January 2017
Authors: Kenji Toda, Tadashi Ishigaki, Mineo Sato, Kazuyoshi Uematsu, Shinnosuke Kamei, Sun Woog Kim, Msahiro Yoshimura, Takuya Hasegawa
This indicates that the melt synthesis technique is suitable as an effective method for the combinatorial chemistry.
The crystal structure of Ca and Sr compounds were found to be that of single phase M3MgSi2O8 (M = Ca and Sr) structure.
In particular, Ca and Sr compounds could be found to be the M3MgSi2O8 (Ca and Sr) structure as the single phase, respectively.
In contrast, the orthorhombic Ba2SiO4 structure was obtained as main phase in the Ba compound.
Yoshimura, Melt synthesis of oxide phosphors with K2NiF4 structures: CaLa1-xEuxGaO4, J.
The crystal structure of Ca and Sr compounds were found to be that of single phase M3MgSi2O8 (M = Ca and Sr) structure.
In particular, Ca and Sr compounds could be found to be the M3MgSi2O8 (Ca and Sr) structure as the single phase, respectively.
In contrast, the orthorhombic Ba2SiO4 structure was obtained as main phase in the Ba compound.
Yoshimura, Melt synthesis of oxide phosphors with K2NiF4 structures: CaLa1-xEuxGaO4, J.
Online since: July 2012
Authors: Jun Gang Gao, Jiang Bo Yang, Xiao Qian Liu, Feng Li Zhu
Influence of Polyols as a Co-stabilizer on Stabilization Efficiency
of Calcium/Zinc Stabilizers to PVC/ACS Blend
Jungang Gaoa, Jianbo Yangb, Xiaoqian Liuc, Fengli Zhud
1College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
agaojg@hbu.edu.cn, b yjb1222@126.com, c lxqeml@163.com, dZhufengli-22@163.com
Keywords: polyvinyl chloride, polyols, calcium/zinc stabilizer, rheological behavior
Abstract.
But because the ACS resin contains chlorinated polyethylene (CPE), due to its structure defect, it has also a low thermal stability and heated discoloration and decomposition.
The hydroxyl groups of polyhydric alcohol can form neutral ligand with metal ion, which will remits the catalytic action of ZnCl2 and formation of colored ligand that generate from metal ion reaction with PVC polyene structure.
It has relative with the number of hydroxyl groups in the same mass of polyols and its molecular structure.
The higher Tp, the higher Tg is, which depends upon the molecular structure and material properties.
But because the ACS resin contains chlorinated polyethylene (CPE), due to its structure defect, it has also a low thermal stability and heated discoloration and decomposition.
The hydroxyl groups of polyhydric alcohol can form neutral ligand with metal ion, which will remits the catalytic action of ZnCl2 and formation of colored ligand that generate from metal ion reaction with PVC polyene structure.
It has relative with the number of hydroxyl groups in the same mass of polyols and its molecular structure.
The higher Tp, the higher Tg is, which depends upon the molecular structure and material properties.
Online since: January 2013
Authors: Risa Suryana, Khoiruddin Khoiruddin, Agus Supriyanto
DSSCs were arranged in a sandwich structure consisting of fluorine-doped tin oxide (FTO) as a transparent conducting oxide (TCO), titanium dioxide (TiO2) layer, beta-carotene dye, iodide/tri-iodide redox electrolyte,and carbon layer as a counter electrode.
DSSC structures are arranged in sandwich system.
Gratzel, Application of functionalized transition metal complexes in photonic and optoelectronic devices, Coordination Chemistry Review 77 (1998) 347-414
DSSC structures are arranged in sandwich system.
Gratzel, Application of functionalized transition metal complexes in photonic and optoelectronic devices, Coordination Chemistry Review 77 (1998) 347-414
Online since: February 2012
Authors: Ji Yao Guo, Xiao Cai Yu, Qian Du, Dong Dong Hu, Xv Zheng
The results manifest that the as-prepared TiO2 is amorphous with the anatase structure and its size is around 33.2nm.
The structure of synthetical TiO2 is anatase pattern with amorphous form, and the particle size is approximately 33.2nm which is a nanometer material.
Reller: Progress in Solid State Chemistry.
The structure of synthetical TiO2 is anatase pattern with amorphous form, and the particle size is approximately 33.2nm which is a nanometer material.
Reller: Progress in Solid State Chemistry.
Online since: July 2011
Authors: Keishi Nishio, Koya Arai, Hiroyuki Akimoto, Tohru Kineri, Tsutomu Iida
.- Department of Applied Chemistry, Tokyo University of Science, Yamaguchi, 1-1-1 Daigaku-Dori, Sanyoonoda-shi, Yamaguchi 756-0884 Japan
ak-nishio@rs.noda.tus.ac.jp, btkineri@ed.yama.tus.ac.jp, ctsutomu@rs.noda.tus.ac.jp
Keywords: NaCo2O4, Mg2Si, thermoelectric module, spark plasma sintering
ABSTRACT.
In particular, Co-based oxides with a layer structure (i.e., NaCo2O4 and CaCo4O9) are good p-type thermoelectric oxide materials[1].
A thermoelectric module would ideally have a π structure.
Fig. 5 shows a photograph of the prepared π structure thermoelectric module.
Fig. 5 Photograph of π structure thermoelectric module.
In particular, Co-based oxides with a layer structure (i.e., NaCo2O4 and CaCo4O9) are good p-type thermoelectric oxide materials[1].
A thermoelectric module would ideally have a π structure.
Fig. 5 shows a photograph of the prepared π structure thermoelectric module.
Fig. 5 Photograph of π structure thermoelectric module.
Controlled Synthesis of Mn3O4 and MnOOH by a Hydrothermal Method and Their Electrochemical Behaviors
Online since: June 2011
Authors: Zi Cheng Zhou, Sheng Tao Xing, Zi Chuan Ma, Yin Su Wu
Controlled synthesis of Mn3O4 and MnOOH by a hydrothermal method and their electrochemical behaviors
Zicheng Zhou, Shengtao Xing, Zichuan Ma* and Yinsu Wu
College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang, 050016, China
*Corresponding author: E-mail: ma_zichuan@163.com
Key words: Manganese oxides; Microstructure; Nanocrystals; electrochemical behaviors.
In the last decade, various methods have been developed to synthesize manganese oxides of desired forms/structures in order to obtain ideal functions in their unique applications.
This work focuses on the determinant influence of the dripping speed of NaOH solution on the crystalline structure of manganese oxides, which are very important in their applications.
All the diffraction peaks can be indexed to the tetragonal hausmannite crystal structure model of Mn3O4, and no other characteristic peaks from impurities were observed, demonstrating the high purity of these samples.
As shown in Fig. 3c and d, the MnOOH samples prepared by pouring the NaOH solution quickly and adding the NaOH solution before H2O2, both of them displayed rod-like structure morphologies.
In the last decade, various methods have been developed to synthesize manganese oxides of desired forms/structures in order to obtain ideal functions in their unique applications.
This work focuses on the determinant influence of the dripping speed of NaOH solution on the crystalline structure of manganese oxides, which are very important in their applications.
All the diffraction peaks can be indexed to the tetragonal hausmannite crystal structure model of Mn3O4, and no other characteristic peaks from impurities were observed, demonstrating the high purity of these samples.
As shown in Fig. 3c and d, the MnOOH samples prepared by pouring the NaOH solution quickly and adding the NaOH solution before H2O2, both of them displayed rod-like structure morphologies.
Online since: July 2012
Authors: Gang Wu, Fang Ke Shao, Qiao Chen
Manufacturing Nafion membranes is, however, particularly expensive and the constraining chemistry of fluorine is going against the requirement for environmental protection.
Fig. 1 Structure of cross-linked PEMs comprising functionalized POSS and SPEEK Experiment Materials VICTREX PEEK grade 450G extruded pellets are purchased from Victrex.
Results and Discussion Membrane morphologies Membrane properties such as the water uptake, proton conductivity, and methanol permeability are expected to be affected because of the hydrophobic core and cubic structure of POSS.
The reason of this behavior shall be that the epoxy network structure composed from DEBS and POSS which resulted in restriction on the SPEEK matrix.
It can be found that the corss-link ternary hybrids possesses higher proton conductivity compared with SPEEK, which is much different from previous publication[4,5], in them with the introduction of the cross-link structure usually cause the decrease of proton conductivity.
Fig. 1 Structure of cross-linked PEMs comprising functionalized POSS and SPEEK Experiment Materials VICTREX PEEK grade 450G extruded pellets are purchased from Victrex.
Results and Discussion Membrane morphologies Membrane properties such as the water uptake, proton conductivity, and methanol permeability are expected to be affected because of the hydrophobic core and cubic structure of POSS.
The reason of this behavior shall be that the epoxy network structure composed from DEBS and POSS which resulted in restriction on the SPEEK matrix.
It can be found that the corss-link ternary hybrids possesses higher proton conductivity compared with SPEEK, which is much different from previous publication[4,5], in them with the introduction of the cross-link structure usually cause the decrease of proton conductivity.
Online since: December 2012
Authors: Shao Juan He, Yong Chang Ye, Jian Yun Zhu, Lu Zhang
The distribution of carbon stock in forest ecosystems are affected by stand age, structure, composition, and site conditions.
Forest stands with different structure and habitat will have varying capacity for carbon sequestration.
Currently, total carbon pool of forest ecosystems in Guangdong province is limited by unsound forest structure and forestry planning.
Soil and Agricultural Chemistry Analysis.
Stand structure and carbon accounting for subtropical forests along the Dongjiang River Basin, South China.
Forest stands with different structure and habitat will have varying capacity for carbon sequestration.
Currently, total carbon pool of forest ecosystems in Guangdong province is limited by unsound forest structure and forestry planning.
Soil and Agricultural Chemistry Analysis.
Stand structure and carbon accounting for subtropical forests along the Dongjiang River Basin, South China.
Online since: July 2014
Authors: Yuan Ming Zhang
Different TiO2 surface structure can also affect the type of target molecules adsorbed on its surface, adsorption, absorption location, and then have some impact on its functionality.
In DC reactive magnetron sputtering TiO2: the film, the sputtering gas, sputtering power, film thickness, temperature, pressure and other process parameters on the work of TiO2 film composition, structure, surface morphology and sputtering efficiency have greater impact.
All samples were used in the base, the lower the target structure, i.e. the preparation of Nano-TiO2 film sputtering from the bottom up to prevent foreign particles fall substrate surface; while the control film deposition temperature of the substrate, due to the high temperature to avoid deformation of the substrate occurred.
Generally believed that while both the composition and structure characteristics of graded buffer layer works best.
Journal of Photochemistry and Photobiology A: Chemistry, 2009, 203(2-3): 192-198
In DC reactive magnetron sputtering TiO2: the film, the sputtering gas, sputtering power, film thickness, temperature, pressure and other process parameters on the work of TiO2 film composition, structure, surface morphology and sputtering efficiency have greater impact.
All samples were used in the base, the lower the target structure, i.e. the preparation of Nano-TiO2 film sputtering from the bottom up to prevent foreign particles fall substrate surface; while the control film deposition temperature of the substrate, due to the high temperature to avoid deformation of the substrate occurred.
Generally believed that while both the composition and structure characteristics of graded buffer layer works best.
Journal of Photochemistry and Photobiology A: Chemistry, 2009, 203(2-3): 192-198
Online since: February 2015
Authors: W. Mahmood Mat Yunus, Zainal Abdib Talib, Wing Fen Yap, Yusof Nor Azah
XPS has been widely used for the characterization of metal compounds structure and their interactions with membranes and films constituted by polymers, their interaction with catalyst, yeast, algal biomass, and synthetic sorbents [1].
This indicates that copper adsorption can take place on the structure imino bond resulting from chitosan crosslinked with glutaraldehyde.
This can be attributed that surface Cu(II) ions are in an octahedral environment, in contrast with the copper spinel structure, where copper occupies predominantly the tetrahedral sites [11].
The reduction occurred in this crosslinked chitosan thin film indicates that the binding of oxidized form of copper ions are probably less stable in this environment; where less amino group after glutaraldehyde crosslinking, more imino group and crosslinked structure are available [14].
After the adsorption of copper(II) ion, the XPS spectra of C 1s peak intensity decreased especially for imino bonds revealed that Cu(II) adsorption can take place on the structure of imino bond.
This indicates that copper adsorption can take place on the structure imino bond resulting from chitosan crosslinked with glutaraldehyde.
This can be attributed that surface Cu(II) ions are in an octahedral environment, in contrast with the copper spinel structure, where copper occupies predominantly the tetrahedral sites [11].
The reduction occurred in this crosslinked chitosan thin film indicates that the binding of oxidized form of copper ions are probably less stable in this environment; where less amino group after glutaraldehyde crosslinking, more imino group and crosslinked structure are available [14].
After the adsorption of copper(II) ion, the XPS spectra of C 1s peak intensity decreased especially for imino bonds revealed that Cu(II) adsorption can take place on the structure of imino bond.