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Online since: November 2013
Authors: Wen Bin Yang, Jian Bin Song, Yu Mei Zhong, Lin Sheng Lan, Song Yue Lin
Double continuous phase, on the base of two incompatible polymers, is formed within a certain percentage (usually 40 wt% ~ 60 wt %), and this special phase structure exhibits coexisting structure, i. e. sea-sea structure [4-6].
The advantage of this structure is to greatly reduce the filler content and decrease the cost.
Here, we choose PVDF and CBT to act as matrix resin of double continuous phase since PVDF has excellent physical and chemistry property and CBT can polymerize into engineering plastics PBT with eminent performance [7].
The advantage of this structure is to greatly reduce the filler content and decrease the cost.
Here, we choose PVDF and CBT to act as matrix resin of double continuous phase since PVDF has excellent physical and chemistry property and CBT can polymerize into engineering plastics PBT with eminent performance [7].
Online since: December 2011
Authors: Gu Qing Xiao, Yu Xiang Wu
The comparison of the adsorption performances of phenol onto H103 resin and XAD-4 resin
Gu-qing XIAO 1, a, Yu-xiang WU 2, b
(1College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000 China)
(2 No Middle School of Seventeen, Hunan City University, Yiyang 413000 China)
axiaoguqing@yahoo.com.cn, bwuyuxiang21@163.com
Keywords: H103 resin; XAD-4 resin; Phenol; Adsorption
Abstract: The objective of this work was to study the comparison of the adsorption performances of phenol in aqueous solution onto H103 resin and XAD-4 resin.
In comparison with classical adsorbents like activated carbons, the polymeric adsorbents are viewed as a more attractive alternative for the controllable pore structures and surface characteristics.
From Fig.1 we can see, in spite of similar polystyrene matrix structure, H103 is a kind of hyper-cross-linked resin while XAD-4 belongs to common macropore resin.
Fig.1 Structure of the resins Table 1.
Initially, phenol molecule occupies the macropores of the H103 first, corresponding rate constants k1=0.0237 min-1; Then, the adsorption of the macropore structure reaches saturation; Phenol molecule occupies the micropores of H103 then, corresponding rate constants k1=0.0151.
In comparison with classical adsorbents like activated carbons, the polymeric adsorbents are viewed as a more attractive alternative for the controllable pore structures and surface characteristics.
From Fig.1 we can see, in spite of similar polystyrene matrix structure, H103 is a kind of hyper-cross-linked resin while XAD-4 belongs to common macropore resin.
Fig.1 Structure of the resins Table 1.
Initially, phenol molecule occupies the macropores of the H103 first, corresponding rate constants k1=0.0237 min-1; Then, the adsorption of the macropore structure reaches saturation; Phenol molecule occupies the micropores of H103 then, corresponding rate constants k1=0.0151.
Online since: July 2015
Authors: Anatoly V. Chzhan, Yan V. Zubavichus, Gennady S. Patrin, R.Yu. Rudenko, V.A. Seredkin, Yu.L. Mikhlin, Vladimir N. Zabluda
Rudenko1, 2
1Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036 Russia
2Siberian Federal University, Krasnoyarsk, 660041 Russia
3National Research Center “Kurchatov Institute”, Moscow, 123098 Russia
4Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036 Russia
e-mail: avchz@mail.ru
Keywords: chemical deposition, amorphous films, surface morphology.
The specific feature of chemically deposited samples is the absence of the column structure, which forms during electrolytic deposition and negatively affects the magnetic properties of films [1].
Results Figure 1 shows the X-ray absorption spectrum of the amorphous Со-Р films and decoding of its fine structure presented in the form of the normalized EXAFS function (Fig. 1a).
It can be seen that the film structure is formed by grains of different shapes.
Structure and magnetic properties of amorphous cobaltphosphorus obtained in transient electrolysis, Proceedings of Int.
The specific feature of chemically deposited samples is the absence of the column structure, which forms during electrolytic deposition and negatively affects the magnetic properties of films [1].
Results Figure 1 shows the X-ray absorption spectrum of the amorphous Со-Р films and decoding of its fine structure presented in the form of the normalized EXAFS function (Fig. 1a).
It can be seen that the film structure is formed by grains of different shapes.
Structure and magnetic properties of amorphous cobaltphosphorus obtained in transient electrolysis, Proceedings of Int.
Online since: June 2010
Authors: Ji Zhou, Cui Sheng Xi, Hui Li Gong, Shi Kao Shi
Preparation and Luminescent Properties of Na5Eu(MoO4)4-x(PO4)x Red
Phosphors for White Light-emitting Diodes Application
Cuisheng Xi1,a, Shikao Shi1,b, Huili Gong1 and Ji Zhou2
1
College of Chemistry & Materials Science, Hebei Normal University, Shijiazhuang 050016, China
2
State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
a
cuisheng518@163.com, bssk02@mails.tsinghua.edu.cn
Keywords: Phosphors, Na5Eu(MoO4)4-x(PO4)x, luminescence
Abstract.
Recently, Eu 3+ activated molybdates and tungstates with scheelite structure have been paid much attention due to their relative chemical stableness and strong absorption in the near-UV region.
In this work, a new red phosphor system, Na5Eu(MoO4)4-x(PO4)x, was prepared by high- temperature solid-state reaction, and their crystal structure and photoluminescence properties were investigated.
The crystal structure of the samples was identified by powder X-ray diffraction (XRD) profiles.
All the patterns manifest that the samples are of a single phase, sharing a tetragonal scheelite-like structure of space group I41/a(88) and consistent with JCPDS card 72-2158 [Na5La(MoO4)4].
Recently, Eu 3+ activated molybdates and tungstates with scheelite structure have been paid much attention due to their relative chemical stableness and strong absorption in the near-UV region.
In this work, a new red phosphor system, Na5Eu(MoO4)4-x(PO4)x, was prepared by high- temperature solid-state reaction, and their crystal structure and photoluminescence properties were investigated.
The crystal structure of the samples was identified by powder X-ray diffraction (XRD) profiles.
All the patterns manifest that the samples are of a single phase, sharing a tetragonal scheelite-like structure of space group I41/a(88) and consistent with JCPDS card 72-2158 [Na5La(MoO4)4].
Online since: October 2011
Authors: Su Gyung Lee, Byoung Kwan Yoo, Young Ho Kim, Chu Sik Park, Han Sol Je
Dimethyl Ether Conversion to Olefins over the SAPO-34/ZrO2 Catalysts:
Effect of the ZrO2 Supporter
Young-Ho Kim1,a, Su-Gyung Lee1,b, Byoung-Kwan Yoo1,c, Han-Sol Je1,d and Chu-Sik Park2,e
1 Department of Fine Chemical Engineering & Applied Chemistry, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejon 305-764, Republic of Korea
2Hydrogen Energy Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea
ayh_kim@cnu.ac.kr, bses-sg@cnu.ac.kr, cfindpp@cnu.ac.kr, dengje@cnu.ac.kr, ecspark@kier.re.kr
Keywords: DME (dimethyl ether), DTO (DME to olefins) reaction, SAPO-34 catalyst, Light olefins (C2=~C4=), ZrO2
Abstract A SAPO-34 catalyst is well known to be one of the best catalysts for DME to olefins (DTO) reaction.
A SAPO-34 catalyst, which is a chabazite material of three-dimensional structure with the entrance pore size of 0.38 nm, is also well known to be one of the best catalysts in the DTO and MTO reactions[3-5].
Characterization and DTO reaction X-ray diffraction (XRD) measurements were carried out to investigate the crystal structure with a Figaku D/max Ⅲ-B.
For the SAPO-34 catalyst with a constrained pore structure, the selectivity to saturated hydrocarbons was relatively low, indicating that the formation of aromatics and cokes from light olefins was rapidly proceeding in the cavity of the pore.
Jeong, The effect of crystal size of SAPO-34 synthesized using various structure directing agents for MTO reaction, J.
A SAPO-34 catalyst, which is a chabazite material of three-dimensional structure with the entrance pore size of 0.38 nm, is also well known to be one of the best catalysts in the DTO and MTO reactions[3-5].
Characterization and DTO reaction X-ray diffraction (XRD) measurements were carried out to investigate the crystal structure with a Figaku D/max Ⅲ-B.
For the SAPO-34 catalyst with a constrained pore structure, the selectivity to saturated hydrocarbons was relatively low, indicating that the formation of aromatics and cokes from light olefins was rapidly proceeding in the cavity of the pore.
Jeong, The effect of crystal size of SAPO-34 synthesized using various structure directing agents for MTO reaction, J.
Online since: July 2012
Authors: Guang Hua Zhang, Ting Shang, Long Liu
Synthesis of Epoxy Sulfonated Phenolic Resin and It's Effects on the Coal-Water Slurry
ZHANG Guanghua 1,a, SHANG Ting 1,b and LIU Long 1,c
1 Key laboratory of Auxiliary Chemistry and technology for Chemical Industry, Shaan Xi University of Science and Technology, Xi’an, 710021, China
azhanggh@sust.edu.cn, b179421652@qq.com, c631207567@qq.com
Keywords: Sulfonated phenolic resin; Epoxy chloropropane; Coal-Water Slurry dispersant
Abstract.
The interaction between the structure of dispersant and different coals was explored to reveal the mechanism of the dispersant on the coal surface through the fine structure of the dispersant and the interaction with coal surface.
It is observed that the absorption peaks of νs(O-H), νas(CH2), νs(Ar-H), νs(Ar-O), νs(SO3), νs(S=O), γ(Ar-H), νs() correspand with the structures of the synthesized compound.
Dispersants interact with the surroundings through different molecular structures to increase the space resistance and reduce the gathering among coal particles.
The interaction between the structure of dispersant and different coals was explored to reveal the mechanism of the dispersant on the coal surface through the fine structure of the dispersant and the interaction with coal surface.
It is observed that the absorption peaks of νs(O-H), νas(CH2), νs(Ar-H), νs(Ar-O), νs(SO3), νs(S=O), γ(Ar-H), νs() correspand with the structures of the synthesized compound.
Dispersants interact with the surroundings through different molecular structures to increase the space resistance and reduce the gathering among coal particles.
Online since: March 2014
Authors: Hong Qi Li, Jia Wei Zhang, Yan Tai Chen, Jun Min Bi, Zhen Chen, Hao Chen, Ming Zhou
Study on a New Coumarin Derivative as Fluorescent Probe for Hg2+ Ions
Hongqi Li*, Zhen Chen, Hao Chen, Jiawei Zhang, Yantai Chen,
Junmin Bi, and Ming Zhou
College of Chemistry, Chemical Engineering & Biotechnology, Donghua University, Shanghai
* hongqili@dhu.edu.cn
Keywords: probe, coumarin, mercury, fluorescent, synthesis
Abstract.
Among the common chromophores for fluorescent sensors coumarins are an excellent candidate because the benzopyrone structure has many advantages including high fluorescence quantum yield, large Stokes shift, excellent light stability, and less toxicity.
The chemical structure of L was fully characterized by 1H NMR, 13C NMR, IR and mass spectrum.
All of the data in the spectra were in good accordance with the structure.
Its structure was characterized by 1H NMR, 13C NMR, IR and mass spectrum.
Among the common chromophores for fluorescent sensors coumarins are an excellent candidate because the benzopyrone structure has many advantages including high fluorescence quantum yield, large Stokes shift, excellent light stability, and less toxicity.
The chemical structure of L was fully characterized by 1H NMR, 13C NMR, IR and mass spectrum.
All of the data in the spectra were in good accordance with the structure.
Its structure was characterized by 1H NMR, 13C NMR, IR and mass spectrum.
Online since: August 2015
Authors: Mohd Mustafa Al Bakri Abdullah, Che Mohd Ruzaidi Ghazali, Hussin Kamarudin, Mohammad Firdaus Abu Hashim, Muhammad Faheem Mohd Tahir, Mohammed Binhussain
Introduction
The new geopolymer has been first named by a French Professor Joseph Davidovits since 1979, inorganic polymeric materials with a chemical composition that are similar to zeolites which is one of the mineral but geopolymer containing an amorphous structure and possessing ceramic-like in the structure and also properties [1].
Composite structures, 2010. 92(2): p. 295-305
Fox, The effect of a rapid heating rate, mechanical vibration and surfactant chemistry on the structure–property relationships of epoxy/clay nanocomposites.
Composite structures, 2010. 92(2): p. 295-305
Fox, The effect of a rapid heating rate, mechanical vibration and surfactant chemistry on the structure–property relationships of epoxy/clay nanocomposites.
Online since: August 2013
Authors: Guang Xiu Cao, Zhong Hou Zhang, Bin Zhai
Photocatalytic Decomposition of Methylene Blue with Lanthanum doping TiO2 under Visible Light Irradiation
Guangxiu Caoa Zhonghou Zhangb Bin Zhaia*
a College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, China
b Henan Provincial Key Laboratory of Surface and Interface Science, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
E-mail: guangxiucao@163.com
Keywords: Methylene blue; Visible light; TiO2; Photocatalytic activity.
To improve the energy band structure of TiO2, and thus shift its optical absorption into the visible light region, the simplest and most feasible modification approaches seem to be doping with foreign elements such as metal elements [6, 7] and non-metal elements.
In this paper, we have demonstrated the feasibility of doping TiO2 with La using a simple preparation method to tune the energy band structure and modify the surface of TiO2.
Crystal Structure.
In summary, this work has demonstrated that extending the spectral response into the visible light region and enhancing the photocatalytic activity can be achieved through tuning the energy band structure and improving the surface area of TiO2 by the synergetic doping of lanthanum.
To improve the energy band structure of TiO2, and thus shift its optical absorption into the visible light region, the simplest and most feasible modification approaches seem to be doping with foreign elements such as metal elements [6, 7] and non-metal elements.
In this paper, we have demonstrated the feasibility of doping TiO2 with La using a simple preparation method to tune the energy band structure and modify the surface of TiO2.
Crystal Structure.
In summary, this work has demonstrated that extending the spectral response into the visible light region and enhancing the photocatalytic activity can be achieved through tuning the energy band structure and improving the surface area of TiO2 by the synergetic doping of lanthanum.
Online since: December 2008
Authors: Vladimir A. Popov, N.T. Kuznetsov, K.Y. Zhizhin, V.M. Retivov, K.P. Staudhammer
Zhizhin
2
, N.T.Kuznetsov
2
, K.P.Staudhammer
3
,
V.M.Retivov2
1
State Technological University "Moscow Institute of Steel and Alloys",
4 Leninsky Prospect, 119049 Moscow, Russia
2
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
31 Leninisky Prospect, GSP-1, Moscow 119991, Russia
3
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
a
popov58@inbox.ru
Keywords: boron clusters, metal matrix composite, thermal stability, coatings
Abstract.
Introduction Boron cluster anions are electron-deficient structures with delocalized electron density.
The low density (from 1 to 2 g/cm 3 depending on structure and composition) (see Table 1) and high working temperature of these compounds (up to 600 Üで) allow us to use the derivatives of boron cluster compounds for creation of novel light-weight composite materials.
The study is dedicated to the synthesis of boron clusters from the initial low-molecular boron-containing raw material (borates), investigation of structure and properties of the obtained compounds, and discussion of the possibility of preparation of composite materials with boron cluster components.
Diffraction patterns from TEM show that developed materials have crystalline structure (Fig. 3) Figure 1.
Introduction Boron cluster anions are electron-deficient structures with delocalized electron density.
The low density (from 1 to 2 g/cm 3 depending on structure and composition) (see Table 1) and high working temperature of these compounds (up to 600 Üで) allow us to use the derivatives of boron cluster compounds for creation of novel light-weight composite materials.
The study is dedicated to the synthesis of boron clusters from the initial low-molecular boron-containing raw material (borates), investigation of structure and properties of the obtained compounds, and discussion of the possibility of preparation of composite materials with boron cluster components.
Diffraction patterns from TEM show that developed materials have crystalline structure (Fig. 3) Figure 1.