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Online since: January 1989
Progress
made in understanding the structure and properties of silicon nitride based
materials has been reviewed every five years at NATO conferences and published
in the form of proceedings entitled NITROGEN CERAMICS edited by F.
At the first conference nitrogen chemistry was heavily emphasized and the current understanding of bonding and phase relations of the known compounds, of thermodynamics of powder formation reactions and densification were summarized, and preliminary efforts to understand structure/property relations presented.
Although the presence of residual intergranular phases was noted, their stability and structure were not understood.
Once again significant progress has been made on all fronts, in physics and chemistry of key mechanisms and processes as well as in engineering applications; therefore, it is not possible to list all of the contributions made during this time.
Topics range from powder production, crystal chemistry and phase equilibria, microstructural development in monolithic silicon nitride and nitrogen glass ceramics, atomic structure of interfaces, thermomechanical and electrical properties, to applications including those in semiconductor device technology, reinforced composites, engine and wear components.
At the first conference nitrogen chemistry was heavily emphasized and the current understanding of bonding and phase relations of the known compounds, of thermodynamics of powder formation reactions and densification were summarized, and preliminary efforts to understand structure/property relations presented.
Although the presence of residual intergranular phases was noted, their stability and structure were not understood.
Once again significant progress has been made on all fronts, in physics and chemistry of key mechanisms and processes as well as in engineering applications; therefore, it is not possible to list all of the contributions made during this time.
Topics range from powder production, crystal chemistry and phase equilibria, microstructural development in monolithic silicon nitride and nitrogen glass ceramics, atomic structure of interfaces, thermomechanical and electrical properties, to applications including those in semiconductor device technology, reinforced composites, engine and wear components.
Online since: November 2011
Authors: Hua Lin, Heng Lin, Bi Sang Chen, Zi Shan Zheng, Hong Xu Guo, Yuan Zhi Chen, Guo Liang Chen, Zhong Hui Chen, Lin Feng Huang, Zhi Chen
But its water resistance is poor since it will hydrolyze as aluminum hydroxide in water to destroy its structure.
Polyethylene is inertia white waxy translucent alkanes polymer, exhibits good chemistry stability and water resistance, and has been widely used in daily life.
The result showed that the encapsulation didn’t affect the inner crystal structure of phosphors.
Results showed that the crystal structures of phosphors were not affected by the encapsulation.
Lv: Guangzhou Chemistry.
Polyethylene is inertia white waxy translucent alkanes polymer, exhibits good chemistry stability and water resistance, and has been widely used in daily life.
The result showed that the encapsulation didn’t affect the inner crystal structure of phosphors.
Results showed that the crystal structures of phosphors were not affected by the encapsulation.
Lv: Guangzhou Chemistry.
Online since: July 2012
Authors: Min Yan Zheng, Yong Sheng Wei, Yuan Zi Gu, Shan Wang, Nai Ni Guo
The structure of product was detected by elemental analysis, 1H NMR, IR and MS.
The target molecule has the structure of alkyl ester and phenoether.
It data of structure is followed.
Serrano, Structure-mesomorphism relationship in terminally functionalised liquid crystal dendrimers, C.
[9] Baorong Li, Jianmin Yi and Kelong Huang, The synthesis of hexyl gallate, Synthetic chemistry, 2 (2006) 178-180 (In Chinese)
The target molecule has the structure of alkyl ester and phenoether.
It data of structure is followed.
Serrano, Structure-mesomorphism relationship in terminally functionalised liquid crystal dendrimers, C.
[9] Baorong Li, Jianmin Yi and Kelong Huang, The synthesis of hexyl gallate, Synthetic chemistry, 2 (2006) 178-180 (In Chinese)
Online since: October 2012
Authors: Lin Zhu, Li Ping Zhang, Wei Yin, Nan Nan Xu, Huan Bao Fa, Jing Ting Zhou, Hao Yu Yao
The Influence of Thermal Treatment Temperature on the Structure and Performance of Monocarboxyphenyl Cobalt Porphyrin Loaded on Carbon Carrier as an Electrocatalyst for Oxygen Reduction
Huanbao Faa*, Liping Zhangb, Wei Yinc, Jingting Zhoud, Nannan Xuf,
Haoyu Yaoe, Lin Zhug
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
ahuanbaofa@cqu.edu.cn, bhmzm0501@163.com, cyinweicqu@163.com
*Corresponding author.
Schmidt: Journal of Inorganic Chemistry, Vol. 23 (2007) No.1, p.34. ] and become depolarized by methanol [2].
Wang: Applied chemistry, Vol. 15 (1998) No.3, p.73. -,[8] X.X.
Wang: Journal of Coordination Chemistry, Vol. 62 (2009) No.7, p. 1151. ] in our lab.
The structure of porphyrin ring had been decomposed at 6000C.
Schmidt: Journal of Inorganic Chemistry, Vol. 23 (2007) No.1, p.34. ] and become depolarized by methanol [2].
Wang: Applied chemistry, Vol. 15 (1998) No.3, p.73. -,[8] X.X.
Wang: Journal of Coordination Chemistry, Vol. 62 (2009) No.7, p. 1151. ] in our lab.
The structure of porphyrin ring had been decomposed at 6000C.
Online since: May 2020
Authors: Liana K. Karimova, Alsu I. Akhmetshina, T.R. Deberdeev
Presence in the structure of these polymers of rigid mesogenic units is key to existing of mesomorphic phase that exhibits anisotropic properties of solids together with fluids rheological behavior [3,4].
According to FTIR spectroscopy, the structure of the samples was almost identical, varying considerably in the degree of polymerization.
Jian, Lyotropic Liquid Crystalline Polyamides Containing Aromatic, Heterocyclic Structures: Preparation and Properties, Macromolecular Chemistry and Physics. 207 (2006)1610-1615
Dingemans, Novel thermotropic esters-based polymers with broad nematic processing windows, Polymer Chemistry. 49 (2008) 6565-6574
Madurro, Formation of novel polymeric films derived from 4-hydroxybenzoic acid, Materials Chemistry and Physics. 129 (2011) 46-52
According to FTIR spectroscopy, the structure of the samples was almost identical, varying considerably in the degree of polymerization.
Jian, Lyotropic Liquid Crystalline Polyamides Containing Aromatic, Heterocyclic Structures: Preparation and Properties, Macromolecular Chemistry and Physics. 207 (2006)1610-1615
Dingemans, Novel thermotropic esters-based polymers with broad nematic processing windows, Polymer Chemistry. 49 (2008) 6565-6574
Madurro, Formation of novel polymeric films derived from 4-hydroxybenzoic acid, Materials Chemistry and Physics. 129 (2011) 46-52
Online since: June 2011
Authors: Sumanth Shankar, Manickaraj Jeyakumar, Srirangam VS Prakash
Knowing the structure and properties of the liquid phase of Al-Si alloys is essential to understand the nucleation environment during solidification.
The physical properties of liquid metals can be evaluated from the atomic structure of liquids by coupling experiment diffraction data with an appropriate theory [16,21].
The alloy chemistry was confirmed by using Inductively Coupled Plasma (ICP) and Glow Discharge Optical Emission Spectroscopy (GDOES).
Alloy chemistries and the respective liquidus temperature measured in this study.
%Si alloy at 885K; (a), (b) and (c) total and partial structure factors; (d), (e) and (f) total and partial pair distribution functions.
The physical properties of liquid metals can be evaluated from the atomic structure of liquids by coupling experiment diffraction data with an appropriate theory [16,21].
The alloy chemistry was confirmed by using Inductively Coupled Plasma (ICP) and Glow Discharge Optical Emission Spectroscopy (GDOES).
Alloy chemistries and the respective liquidus temperature measured in this study.
%Si alloy at 885K; (a), (b) and (c) total and partial structure factors; (d), (e) and (f) total and partial pair distribution functions.
Online since: December 2012
Authors: Ya Cui Guo, Xiu Li Wu, Pi Xin Wang
Preparation and characterization of high-substituted cationic starches
in aqueous solutions
Xiuli Wu1,a, Yacui Guo2, b, Pixin Wang 3,c
1College of Biological Science and Technology, Changchun University, Changchun, Jilin 130012, China;
2The Secondary Vocational School of Quality and Technical Supervision, Changchun, Jilin 130022, China
3Polymer Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
accwxl0323@sina.com, bjsjd-gyc@163.com,cpxwang@ciac.jl.cn
Keywords: Corn starch;cationic starch;high degree of substitution;structure characterization
Abstract.
Structure of the product is characterized by FTIR and 13C NMR spectroscopy.X-ray diffraction indicates that the crystal structure of the native starch is destroyed and disordered structure of cationic starch is formed.
This means that part of starch crystalline structure is destroyed by the cationizing reaction and the amount of amorphism increases.
X-ray diffraction results show that cationization destroys the crystalline structure of starch granules and forms a amorphous structure.
Food Chemistry. 106 (2008) 923-928.
Structure of the product is characterized by FTIR and 13C NMR spectroscopy.X-ray diffraction indicates that the crystal structure of the native starch is destroyed and disordered structure of cationic starch is formed.
This means that part of starch crystalline structure is destroyed by the cationizing reaction and the amount of amorphism increases.
X-ray diffraction results show that cationization destroys the crystalline structure of starch granules and forms a amorphous structure.
Food Chemistry. 106 (2008) 923-928.
Online since: November 2013
Authors: A.R. Umatt, B.S. Chakrabarty, A.K. Patel
Chakrabartya
(a) Applied Physics Department,
(b) Applied Chemistry Department
Faculty of Technology & Engineering
The M.
Similarly the 2Ѳ values of La2O3 and CeO2 from fig:2 and Fig:3 show Hexagonal and Cubic crystal structure respectively.
Yucai Hu, Ping Yin, Tao Liang, Jiang Zhang & Dangdong Zhu, Indian Journal of Chemistry, August 2007, Vol. 46A [4.]
International Journal of Organic Chemistry, 2011, Vol. 1 [10.]
Indian journal of chemistry.
Similarly the 2Ѳ values of La2O3 and CeO2 from fig:2 and Fig:3 show Hexagonal and Cubic crystal structure respectively.
Yucai Hu, Ping Yin, Tao Liang, Jiang Zhang & Dangdong Zhu, Indian Journal of Chemistry, August 2007, Vol. 46A [4.]
International Journal of Organic Chemistry, 2011, Vol. 1 [10.]
Indian journal of chemistry.
Online since: July 2013
Authors: Manoj Kumar Mitra, Jui Chakraborty, Manjusha Chakraborty, Swapankumar Ghosh
LDHs are derived from the structure of mineral brucite, Mg(OH)2.
Such a structure throws open the possibility of performing a wide range of intercalation chemistry and as a result, they have found extensive use in catalysis, environmental chemistry and engineering [5].
Further, as evident from the LDH structure, they are excellent anion exchange materials and their extensive intercalation chemistry has widespread applications in areas including medicine due to their unique host-guest type structure.
Wipf, Nanoparticles in cellular drug delivery, Bioorganic & Medicinal Chemistry 17 (2009) 2950-2962
Duan, Nanostructural drug-inorganic clay composites: Structure, thermal property and in vitro release of captopril-intercalated Mg-Al-layered double hydroxides, Journal of Solid State Chemistry 179 (2006) 1792-1801
Such a structure throws open the possibility of performing a wide range of intercalation chemistry and as a result, they have found extensive use in catalysis, environmental chemistry and engineering [5].
Further, as evident from the LDH structure, they are excellent anion exchange materials and their extensive intercalation chemistry has widespread applications in areas including medicine due to their unique host-guest type structure.
Wipf, Nanoparticles in cellular drug delivery, Bioorganic & Medicinal Chemistry 17 (2009) 2950-2962
Duan, Nanostructural drug-inorganic clay composites: Structure, thermal property and in vitro release of captopril-intercalated Mg-Al-layered double hydroxides, Journal of Solid State Chemistry 179 (2006) 1792-1801