Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: January 2013
Authors: V.M. Novotortsev, E.F. Kustov, I.L. Eremenko, E.O. Goncharov
Krupichka, Physics of Ferrites and Their Related Magnetic Oxides [Russian translation], Vol.1, Mir, Moscow, 1976.
,[4] R.Janes, E.Moore, Metal-Ligand Bonding, Royal Society of Chemistry, 2004.
].
A theoretical method for the direct calculation of the energy matrix of the structure and magnetic properties of transition metal ions, which involves the calculation of the full matrix of all the interactions that exist in an ion[[5] E.F.
The Calculation of the Energy Structure of the Transition-Metals The main issue in the calculation of the energy structure is a question of determination the operator of total energy of the system, which characterizes the electronic structure of the element.
Such compounds attracts the attention of physicists and chemists by possibility of varying the magnetic properties by chemical design of certain structures.
Usinganappropriate compiled mathematical program for calculating the total energy structure matrix and matrix of the magnetic moment based on this method we studied and analyzed the magnetic moment of Co2+ ion in cases of cobalt(II)central ion are placed in intramolecularcrystal fields of cubic and tetragonal symmetry.
A theoretical method for the direct calculation of the energy matrix of the structure and magnetic properties of transition metal ions, which involves the calculation of the full matrix of all the interactions that exist in an ion[[5] E.F.
The Calculation of the Energy Structure of the Transition-Metals The main issue in the calculation of the energy structure is a question of determination the operator of total energy of the system, which characterizes the electronic structure of the element.
Such compounds attracts the attention of physicists and chemists by possibility of varying the magnetic properties by chemical design of certain structures.
Usinganappropriate compiled mathematical program for calculating the total energy structure matrix and matrix of the magnetic moment based on this method we studied and analyzed the magnetic moment of Co2+ ion in cases of cobalt(II)central ion are placed in intramolecularcrystal fields of cubic and tetragonal symmetry.
Online since: November 2011
Authors: Jia Yun Zhang, Xiao Wei Zhu, Jin Rong Bao, Ran Bo Yu, Xian Ran Xing
Hydrothermal Synthesis of Neodymium Orthophosphate with Controlled Structure and Morphology
Jinrong Bao1, a, Xiaowei Zhu2, Ranbo Yu3, b, Jiayun Zhang3 and Xianran Xing3
1School of Chemistry and Chemical Engineering, University of Inner Mongolia, Hohhot 010021, China;
2Medical College of Inner Mongolia, Hohhot 010110, China
3Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
aemail: jinrongbao@imu.edu.cn, bemail: nmbaojinrong@sina.com, cemail: ranboyu@ustb.edu.cn
Keywords: hydrothermal synthesis, nanostructures; rare earth phosphates; phase transition
Abstract.
The possible formation mechanism for NdPO4 nanorods with different morphologies and structures was discussed.
In general, REPO4 have three different structure types, hexagonal, tetragonal, and monoclinic structures.
The hexagonal structure is a low-temperature phase, and it can transform into the monoclinic structure after calcinations at 900 °C or hydrothermal reaction at 200 °C, while the tetragonal maintains its structure after calcinations at 900 °C [4, 11-16].
In addition, hexagonal NdPO4 can be applied in the tribology because of its natural layered structure [19].
The possible formation mechanism for NdPO4 nanorods with different morphologies and structures was discussed.
In general, REPO4 have three different structure types, hexagonal, tetragonal, and monoclinic structures.
The hexagonal structure is a low-temperature phase, and it can transform into the monoclinic structure after calcinations at 900 °C or hydrothermal reaction at 200 °C, while the tetragonal maintains its structure after calcinations at 900 °C [4, 11-16].
In addition, hexagonal NdPO4 can be applied in the tribology because of its natural layered structure [19].
Online since: February 2011
Authors: Nian Ping Yi, Fu Rong Ma, Xin Gui Zhang
Table 1 summarizes the chemistry,structure,structure and mineral of mudstone weathering.
Table 1 The granularity, chemistry, mineral and structure of mudstone lithology the contentof particle be less than 2u chemistry mineral structure mudstone and weathering 50% Sio2 55% Illite, about 50% Shaly structure; orientational arragement of article Al2O3 26% Kaolinite,about30% Si/ Al 4.20 Montmorillonite,about10-25% CEC 24.15me/100g Halloysite,Chlorite,Quartz type of mg-Ca unsaturation The Analysis of Influence Factors on the Strength of Mudstone The Influence of Composition on the Strength of Mudstone.
The composition and structure of mudstone are often changed through solution, corrosion, lubrication, water-wedge and so on.
The most obvious points of machine disturbance are unloading rebound as well as damage of structure and pore looseness caused by unloading.
Because there exists much cranny inside mudstone, the structure and formation of mudstone will be changed under influence of water.
Table 1 The granularity, chemistry, mineral and structure of mudstone lithology the contentof particle be less than 2u chemistry mineral structure mudstone and weathering 50% Sio2 55% Illite, about 50% Shaly structure; orientational arragement of article Al2O3 26% Kaolinite,about30% Si/ Al 4.20 Montmorillonite,about10-25% CEC 24.15me/100g Halloysite,Chlorite,Quartz type of mg-Ca unsaturation The Analysis of Influence Factors on the Strength of Mudstone The Influence of Composition on the Strength of Mudstone.
The composition and structure of mudstone are often changed through solution, corrosion, lubrication, water-wedge and so on.
The most obvious points of machine disturbance are unloading rebound as well as damage of structure and pore looseness caused by unloading.
Because there exists much cranny inside mudstone, the structure and formation of mudstone will be changed under influence of water.
Online since: August 2013
Authors: Xin Ding Yao, Rui Na Fang, Hong Jian Pang, Zong Wu Wang, Guo Ji Liu
Novel copolymers of N-[(4-bromo-3,5- difluorine) phenyl] acryl- amide with methyl methacrylate: synthesis, characterization and thermal properties
Xinding Yao 1, Ruina Fang 1 , Hongjian Pang 1,
Zongwu Wang 1, Guoji Liu 2
(1: Environment and Chemistry Engineering Department of Yellow River Conservancy Technical Institute, Kaifeng,475004,Henan China;
2: Zhengzhou University, Henan 450001, Zhengzhou, China)
Keywords: N-[(4-bromo-3,5-difluorine)phenyl]acrylamide; Synthesis; Thermal studies
Abstract: Copolymers of N-[(4-bromo-3,5-difluorine)phenyl]acrylamide(BDPA), with methyl methacrylate (MMA) were synthesized in N,N- Dimethylformamide at 75±1℃ using 2,2-azobisisobutyronitrile(AIBN) as an initiator with different monomer-to-monomer ratios in the feed.
Poly(MMA-co-BDPA) Scheme 1 The structure monomeric units of the copolymer characterization of polymers The FTIR spectrum of the copolymer, poly(BDPA-co-MMA) (0.38:0.62), is shown in Fig.1.
[2] Liu,GQ;Fan,W;Li,L.JOURNAL OF FLUORINE CHEMISTRY, vol.141(2012), p.21-28 [3] Mistri,EA;Mohanty,AK;Bane,S.JOURNAL OF MEMBRANE SCIENCE, vol.- 411(2012), p.117-129
[8] Tenn,N; Follain, N; Fatyeyeva,K.Journal of Physical Chemistry, vol. 116 (2012), p.12599-1 2612
Poly(MMA-co-BDPA) Scheme 1 The structure monomeric units of the copolymer characterization of polymers The FTIR spectrum of the copolymer, poly(BDPA-co-MMA) (0.38:0.62), is shown in Fig.1.
[2] Liu,GQ;Fan,W;Li,L.JOURNAL OF FLUORINE CHEMISTRY, vol.141(2012), p.21-28 [3] Mistri,EA;Mohanty,AK;Bane,S.JOURNAL OF MEMBRANE SCIENCE, vol.- 411(2012), p.117-129
[8] Tenn,N; Follain, N; Fatyeyeva,K.Journal of Physical Chemistry, vol. 116 (2012), p.12599-1 2612
Online since: September 2014
Authors: Mohammed Ibrahim Abdul Mutalib, Massoud Kermanioryani, Lukman B. Ismail, Ghodsieh Bagherzadeh
Ismail1,b,
Mohamed Ibrahim Abdul Mutalib1,c and Ghodsieh Bagherzadeh2,d
1Department of Chemical Engineering University Technology PETRONAS .Bandar Seri Iskandar, 31750 Tronoh, Perak Malaysia
2 Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
blukmis@petronas.com.my
cibrahmat@petronas.com.my
dgbagherzade@gmail.com
* masoud.kermani1984@gmail.com
Keywords: textile industry, methylene blue, water, ionic liquid
Abstract.
INTRODUCTION Cationic dyes have different chemical structures according to substituted aromatic groups.
Christie, Colour Chemistry, Royal Society of Chemistry, 2001
INTRODUCTION Cationic dyes have different chemical structures according to substituted aromatic groups.
Christie, Colour Chemistry, Royal Society of Chemistry, 2001
Online since: December 2013
Authors: Zhi Yong Zhang, Hai Qing Jiang, Bo Jin, Jian Zhang Shi, Tian Ming Lei, Ying Xi
The structure of BiVO4 was optimized by the GGA-PBE basis set of CASTEP.
So, the structure of W-BiVO4 was the most stable with the doping concentration of 6.25%, Band Structure and Density of States.
Guo, et al: Chinese Journal of Inorganic Chemistry, Vol. 27 (2011), p.19
Cai, et al: Journal of Physical Chemistry B, Vol. 110 (2006) No.41, p.20211
Ye, et al: Journal of Physical Chemistry C, Vol. 115 (2011), p.17870
So, the structure of W-BiVO4 was the most stable with the doping concentration of 6.25%, Band Structure and Density of States.
Guo, et al: Chinese Journal of Inorganic Chemistry, Vol. 27 (2011), p.19
Cai, et al: Journal of Physical Chemistry B, Vol. 110 (2006) No.41, p.20211
Ye, et al: Journal of Physical Chemistry C, Vol. 115 (2011), p.17870
Online since: October 2014
Authors: Ri Hong Tan
Synthesis and Biological Activities of
1,2,4-Triazine Derivatives
TAN Rihong
Department of Chemistry, Teacher’s College of Shenyang University, No 21 Wanghuanan Road Dadong Dist. 110044, Shenyang Liaoning Prov., People’s Republic of China
Email-rihongtan@sohu.com
Keywords: 1,2,4-triazines ;synthesis ; anti-inflammatory activities
Abstracts: To sdudy the synthesis and biological activities of 1,2,4-triazine derivatives, a series of 1,2,4-triazines were prepared from the reaction of 3-mercapto-5-hydroxyl-6-methyl-1,2,4-triazine with alkyl halide.The structures of prepared compounds were confirmed by IR, 1H-NMR and elemental analysis.
Nonsteroidal Antiinflammatory Drugs (NSAIDs), such as aspirin (2-ethanoylhydroxybenzoic acid), indomethacin (1-(4-Chlorobenzoyl)-5-methoxy-2-methyl- 3-in-doleacetic acid), all show excellent anti-inflammatory, antinociceptive and antifebric effects, and are now widely used clinically for the treatments of acute & chronic pains and stepped care of cancer pains. 1,2,4-triazine derivatives are an important class of N-heterocyclic structure containing a broad presence in a variety of important bioactive compounds, agricultural supplies and functional materials, they have a series such as antimicrobial, analgesic, inflammation, lowering blood pressure and weeding very important biological and pharmaceutical activity.
Explore novel heterocyclic compounds synthesis and biological activity is the current frontier heterocyclic organic chemistry and hot areas in recent years, research results show that 1,2,4-triazine derivatives because of its unique molecular structure shows a variety of various physiological, biological activity, it is of concern to the chemist gradually, while 1,2,4-triazine derivatives are also a class of important organic synthetic intermediates have been widely used in organic synthesis [1-4].
The structures of 2a, 2b and 2c were determined by spectral data and elemental analysis.
Nonsteroidal Antiinflammatory Drugs (NSAIDs), such as aspirin (2-ethanoylhydroxybenzoic acid), indomethacin (1-(4-Chlorobenzoyl)-5-methoxy-2-methyl- 3-in-doleacetic acid), all show excellent anti-inflammatory, antinociceptive and antifebric effects, and are now widely used clinically for the treatments of acute & chronic pains and stepped care of cancer pains. 1,2,4-triazine derivatives are an important class of N-heterocyclic structure containing a broad presence in a variety of important bioactive compounds, agricultural supplies and functional materials, they have a series such as antimicrobial, analgesic, inflammation, lowering blood pressure and weeding very important biological and pharmaceutical activity.
Explore novel heterocyclic compounds synthesis and biological activity is the current frontier heterocyclic organic chemistry and hot areas in recent years, research results show that 1,2,4-triazine derivatives because of its unique molecular structure shows a variety of various physiological, biological activity, it is of concern to the chemist gradually, while 1,2,4-triazine derivatives are also a class of important organic synthetic intermediates have been widely used in organic synthesis [1-4].
The structures of 2a, 2b and 2c were determined by spectral data and elemental analysis.
Online since: September 2013
Authors: Hong Li, Rui Liu
NMR and IR confirmed the structures of the substances.
Hydroxy acid, which has a polar structure, is soluble in water.
Structure of this product was confirmed on the basis of 1H NMR and IR spectral data.
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)
Hydroxy acid, which has a polar structure, is soluble in water.
Structure of this product was confirmed on the basis of 1H NMR and IR spectral data.
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: July 2012
Authors: Jian Chao Wang, Shu Hai Wang, Bo Zhai, Guang Ye
And structures of the plating coatings were investigated by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD).The optimum composition and operating conditions for abstaining satisfied Ni-B alloy coating are provided.
The best solution composition and operating conditions of Ni-B alloy plating were provided by investigating the plating coating composition, sedimentary speed and composite coating structure.
And the structure is examined by x-ray diffractometry with Shimadzu XRD-600 and scanning electron microscopy (SEM).
crystal structure and Chemical composition of Ni-B alloy coating Fig.2 XRD patterns of Ni-B The coating obtained under optimized bath composition was probably preferentially crystallized (see Fig.2).
Acknowledgements The authors express their sincere thanks to the Council of the NNSFC for the financial support to carry out this research work(51061016) References [1] chepuri R.K.Rao,D.C.Trivedi;chemical and electrochemical depositions of platinum group metals and their applications[J]; coordination chemistry reviews :2005 249;613-631
The best solution composition and operating conditions of Ni-B alloy plating were provided by investigating the plating coating composition, sedimentary speed and composite coating structure.
And the structure is examined by x-ray diffractometry with Shimadzu XRD-600 and scanning electron microscopy (SEM).
crystal structure and Chemical composition of Ni-B alloy coating Fig.2 XRD patterns of Ni-B The coating obtained under optimized bath composition was probably preferentially crystallized (see Fig.2).
Acknowledgements The authors express their sincere thanks to the Council of the NNSFC for the financial support to carry out this research work(51061016) References [1] chepuri R.K.Rao,D.C.Trivedi;chemical and electrochemical depositions of platinum group metals and their applications[J]; coordination chemistry reviews :2005 249;613-631
Online since: October 2015
Authors: Ai Ping Chen, Hong Bo He, Tian Tian He, Chun Zhong Li, Xiu Li Sun
The Journal of Physical Chemistry C. 2007, 111, 9614-9623
Chemistry of Materials. 2004, 16, 4292-4295
Journal of Photochemistry and Photobiology A: Chemistry. 2012, 238, 63-70
Journal of Materials Chemistry. 2011, 21, 5062-5068
The Journal of Physical Chemistry C, 2011, 115, 22954-22959
Chemistry of Materials. 2004, 16, 4292-4295
Journal of Photochemistry and Photobiology A: Chemistry. 2012, 238, 63-70
Journal of Materials Chemistry. 2011, 21, 5062-5068
The Journal of Physical Chemistry C, 2011, 115, 22954-22959