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Online since: September 2014
Authors: Andrey Klishin, Alexander Kovancev, Alexander Zakutaev, Vladimir Vereshchagin, Stanislav Rudnev
The possibility of using the thermomagnetic processing method for obtaining the disperse and homogeneous structure has been shown.
The powders were synthesized by the decomposition of liquid-phase precursors in high-frequency discharge plasma (a plasma chemistry method).
Samples of the fourth group, 5 mol. % yttria-stabilized zirconia, were prepared from ultradisperse powders of ZrO2(Y2O3), manufactured by the Siberian Chemical Combine, Russia (Technical Specification TU 2320-001-07622928-96), synthesized by the plasma chemistry method, with the primary particle size of 0.1–0.5 microns and the average particle size of 150 nanometers (rrel = 0.892).
Results and discussion Both the directed influence of the structured magnetic field and the change in temperature during thermomagnetic processing lead to a partial reorganization of the lattice structure of primary crystals of Al2O3 and ZrO2(Y2O3), up to a certain stabilized equilibrium state.
Semukhin, and A.P.Klishin, Geometrical modeling of crystal structures with use of space of elliptic Riemannian geometry, Materials Sciences and Applications 2, 6 (2011) 526–536
The powders were synthesized by the decomposition of liquid-phase precursors in high-frequency discharge plasma (a plasma chemistry method).
Samples of the fourth group, 5 mol. % yttria-stabilized zirconia, were prepared from ultradisperse powders of ZrO2(Y2O3), manufactured by the Siberian Chemical Combine, Russia (Technical Specification TU 2320-001-07622928-96), synthesized by the plasma chemistry method, with the primary particle size of 0.1–0.5 microns and the average particle size of 150 nanometers (rrel = 0.892).
Results and discussion Both the directed influence of the structured magnetic field and the change in temperature during thermomagnetic processing lead to a partial reorganization of the lattice structure of primary crystals of Al2O3 and ZrO2(Y2O3), up to a certain stabilized equilibrium state.
Semukhin, and A.P.Klishin, Geometrical modeling of crystal structures with use of space of elliptic Riemannian geometry, Materials Sciences and Applications 2, 6 (2011) 526–536
Online since: January 2022
Authors: Chloé Fourdrin, Jean Baptiste d'Espinose de Lacaillerie, Ann Bourgès, Julia Tourtelot, Emmanuel Keita
We showed that the improvement of the mechanical strength with starch is depending on clay nature and their chemistry.
We showed that the improvement of the mechanical strength with starch is depending on clay nature and their chemistry.
Constr Build Mater 111:719–734. https://doi.org/10.1016/j.conbuildmat.2016.02.119 [5] Vissac A, Bourgès A, Gandreau D, et al (2017) Argiles & Biopolymères Les stabilants naturels pour la construction en terre [6] Tester RF, Karkalas J, Qi X (2004) Starch—composition, fine structure and architecture.
Starch ‐ Stärke 37:1–5. https://doi.org/10.1002/star.19850370102 [8] Pérez S, Bertoft E (2010) The molecular structures of starch components and their contribution to the architecture of starch granules: A comprehensive review.
J Mater Sci 43:3058–3071. https://doi.org/10.1007/s10853-007-2434-8 [11] Brigatti MF, Galán E, Theng BKG (2013) Structure and Mineralogy of Clay Minerals.
We showed that the improvement of the mechanical strength with starch is depending on clay nature and their chemistry.
Constr Build Mater 111:719–734. https://doi.org/10.1016/j.conbuildmat.2016.02.119 [5] Vissac A, Bourgès A, Gandreau D, et al (2017) Argiles & Biopolymères Les stabilants naturels pour la construction en terre [6] Tester RF, Karkalas J, Qi X (2004) Starch—composition, fine structure and architecture.
Starch ‐ Stärke 37:1–5. https://doi.org/10.1002/star.19850370102 [8] Pérez S, Bertoft E (2010) The molecular structures of starch components and their contribution to the architecture of starch granules: A comprehensive review.
J Mater Sci 43:3058–3071. https://doi.org/10.1007/s10853-007-2434-8 [11] Brigatti MF, Galán E, Theng BKG (2013) Structure and Mineralogy of Clay Minerals.
Online since: December 2011
Authors: Jin Wei Yang, Li Xin Li, Hui Jiao Ling, Ling Xiang, Feng Ying Li, Zheng Yuan Zhang
What can be inferred from the results is that the lamellar structure of OMMT has been exfoliated and dispersed into resin solution.
The noncombustible gases such as NH3, NO and H2O may be released[10.11] and the stable compound with P-C-N structure is formed instantly [12].
Because of its nanocomposite structure,it is a highly effective flame retardant with good synergistic effect, and can be widely used in leather for flame-retardation.
[3] Zhiyu Bao, Yanmao Dong: Chemistry World.
[11] Zejiang Zhang, Xiujuan Mei, Liangrong Fen, Fali Qiu: Chinese journal of applied chemistry, Vol, 20(2003), p.1035-1038
The noncombustible gases such as NH3, NO and H2O may be released[10.11] and the stable compound with P-C-N structure is formed instantly [12].
Because of its nanocomposite structure,it is a highly effective flame retardant with good synergistic effect, and can be widely used in leather for flame-retardation.
[3] Zhiyu Bao, Yanmao Dong: Chemistry World.
[11] Zejiang Zhang, Xiujuan Mei, Liangrong Fen, Fali Qiu: Chinese journal of applied chemistry, Vol, 20(2003), p.1035-1038
Online since: November 2016
Authors: Antônio Hortêncio Munhoz Jr., Leila Figueiredo de Miranda, Raphael Cons Andrades
The structure of pseudoboehmite consists of oxygen octahedra partially filled with aluminum cations[2].
On the other hand, sample 7 displayed a very different morphology, with lamellar structure and porous surface.
Buyanov: Russian Journal of Inorganic Chemistry Vol. 23 (1978), p. 988
Satcher Jr: Chemistry of Materials Vol. 17 (2005), p. 395
Tétot: Journal of Solid State Chemistry Vol. 182 (2009), p. 1171.
On the other hand, sample 7 displayed a very different morphology, with lamellar structure and porous surface.
Buyanov: Russian Journal of Inorganic Chemistry Vol. 23 (1978), p. 988
Satcher Jr: Chemistry of Materials Vol. 17 (2005), p. 395
Tétot: Journal of Solid State Chemistry Vol. 182 (2009), p. 1171.
Online since: September 2013
Authors: Tai Shun Zhang, Xiong Min Xie, Song Cao, Wei Zeng, Shuo Wang, Zu Guang Liu
It is difficult to prepare polyterpene resins in a high yield due to the specific features of the molecular structure of α-pinene in which the double bond is sterically shielded in contrast to β-pinene [3].
Silica is a good support with high specific surface area and special pore structure [14, 15].
The diffraction peak of Keggin structure in PW appeared at 7-10°, 16-22°, 25-30° and 33-36° [17].
All catalysts were observed the characteristic bands of Keggin structure.
Xu, in: Introduction of Polyoxometalates Chemistry /Chemical Industry Press Publishing, Beijing, China(1998)
Silica is a good support with high specific surface area and special pore structure [14, 15].
The diffraction peak of Keggin structure in PW appeared at 7-10°, 16-22°, 25-30° and 33-36° [17].
All catalysts were observed the characteristic bands of Keggin structure.
Xu, in: Introduction of Polyoxometalates Chemistry /Chemical Industry Press Publishing, Beijing, China(1998)
Online since: February 2012
Authors: Zheng Li, Jian Fei Zhang, Jian Jun Yan, Chang Sheng Qiao
The HPMC provided a more flexible structure compared to pullulan due to containing a large number of side chains, which resulted in molecules sliding easily, whereas pullulan is linear molecule leading to tight structure.
The film obtained the tighter structure in the ratio (1/2).
Zampraka: Food Chemistry Vol. 101 (2007), p. 753–764
Champagne: Food Chemistry Vol. 127 (2011), p. 118–121
[12] Shih, F.F: Cereal Chemistry Vol. 73 (1996), p. 406–409
The film obtained the tighter structure in the ratio (1/2).
Zampraka: Food Chemistry Vol. 101 (2007), p. 753–764
Champagne: Food Chemistry Vol. 127 (2011), p. 118–121
[12] Shih, F.F: Cereal Chemistry Vol. 73 (1996), p. 406–409
Online since: July 2004
Authors: P. Bosch, M.A. Valenzuela, G. Fetter, I. Córdova, S.O. Flores, A. Vázquez, B. Zapata
Introduction
Mn3O4, manganese (II, III) oxide, has a spinel structure, also known by the mineral name
hausmannite.
The manganese oxides are often prepared by solid state reaction, wet chemistry or soft chemistry.
This compound has a cubic spinel structure.
Molecular structure.
Earnshaw: Chemistry of the elements (Pergamon Press, London (1989)
The manganese oxides are often prepared by solid state reaction, wet chemistry or soft chemistry.
This compound has a cubic spinel structure.
Molecular structure.
Earnshaw: Chemistry of the elements (Pergamon Press, London (1989)
Online since: May 2013
Authors: Qi Feng Liu
Preparation and Characterization of a Novel Gadolinium Triple-Decker Sandwich-Type Complex with Tetrabenzoporphyrin Ligand
Liu Qifeng
College of Chemistry and Chemical Technology, Shangqiu Normal University, Shangqiu, Henan, 476000, China
lqf8627@126.com
Keywords: Tetrabenzoporphyrin; sandwich-like complex; gadolinium metal; spectroscopic and magnetic properties, triple-decker
Abstract: A novel gadolinium triple-decker sandwich-type complex containing tetrabenzoporphyrin (TBP) ligands-Gd(TBP)3 was prepared from porphyrin 1 and Gd (acac)3.nH2O in boiling 1, 2, 4-Tcb for 45~48 h under Ar.
Its structure is characterized by Uv-Vis spectroscopy and HR-MS.
Whereas the chemistry and properties of homoleptic sandwich complexes containing the same pophyrinato ligands of various lanthanide metals have been extensively studied [1, 5-6], actually all of them are confined to the sandwich-type complexes containing meso-substituted porphyrin ligands except for octaethylporphyrin (OEP) or octamethylporphyrin (OMP).
Mass (m/z) corresponding to the most abundant isotopic peak of the molecular ion for C108H60Gd2N12 is calculated as 1840.3540 and found to be 1840.3561, which confirms the identity of the molecular structure of the prepared compound-Gd (TBP)3.
Its structure is characterized by Uv-Vis spectrometer and HR-MS.
Its structure is characterized by Uv-Vis spectroscopy and HR-MS.
Whereas the chemistry and properties of homoleptic sandwich complexes containing the same pophyrinato ligands of various lanthanide metals have been extensively studied [1, 5-6], actually all of them are confined to the sandwich-type complexes containing meso-substituted porphyrin ligands except for octaethylporphyrin (OEP) or octamethylporphyrin (OMP).
Mass (m/z) corresponding to the most abundant isotopic peak of the molecular ion for C108H60Gd2N12 is calculated as 1840.3540 and found to be 1840.3561, which confirms the identity of the molecular structure of the prepared compound-Gd (TBP)3.
Its structure is characterized by Uv-Vis spectrometer and HR-MS.
Online since: July 2011
Authors: Yue Meng, Yi Guo Su, Xiao Jing Wang, Yue Ban
Study on the electron excitation for Polychlorinated dibenzo-p-dioxins and several aromatic substances by DFT method
Yiguo Su1,a, Yue Meng2,b,Yue Ban,1,c and Xiaojing Wang,1,d,*
1College of Chemistry and Chemical Engineering, Inner Mongolia University, China
2Inner Mongolia Experiment Research Institute of Geology and Resources, China
a: cesyg@imu.edu.cn, b: 261113223@qq.com, c: banyuebubian@163.com,
d: wang_xiao_jing@hotmail.com
*corresponding author.
The main spectral features were interpreted on the basis of the electronic structure of PCDDs by fully considering the possible interference of coexist organic molecules for the electron spectra.
Computational details The electron structure and electron excitation of PCDDs were investigated by density functional theory using Amsterdam Density Function (ADF2000) program package [6].
The excitation energies and oscillator strengths were calculated by TDDFT method with LB94 functional and diffuse basis sets by ADF program based on the optimized structures of these eight congeners.
Zewail, Femtochemistry: Ultrafast Dynamics of the Chemical Bond, World Scientific Series in 20th Century Chemistry, Vol. 3 , World Scientific, Singapore, 1994
The main spectral features were interpreted on the basis of the electronic structure of PCDDs by fully considering the possible interference of coexist organic molecules for the electron spectra.
Computational details The electron structure and electron excitation of PCDDs were investigated by density functional theory using Amsterdam Density Function (ADF2000) program package [6].
The excitation energies and oscillator strengths were calculated by TDDFT method with LB94 functional and diffuse basis sets by ADF program based on the optimized structures of these eight congeners.
Zewail, Femtochemistry: Ultrafast Dynamics of the Chemical Bond, World Scientific Series in 20th Century Chemistry, Vol. 3 , World Scientific, Singapore, 1994
Online since: January 2015
Authors: Jing Li
Effect of the enzymatic hydrolysis on starch properties
Jing Li
1College of Material Science and Chemical Engineering,Tianjin University of Science and Technology,Tianjin ,China
e-mail address: 514985570@qq.com
Keywords: α-amylase; hydrolytic time;viscosity;structure ;mechanical
Abstract: In this article, corn starch was modified by α-amylase with different hydrolytic time (30, 60, 90 and 120 min) and the effects of modification technology on its properties of viscosity, compound structure and mechanical were studied.
The result showed that structure of modified starch was conserved with hydrolytic time increased, whereas tensile strength were increased and viscosity was decreased.
The granular structure was conserved after high activity enzymatic modification for maize [5].
(A) t0 (B) t30 (C) t60 (D) t90 (E) t120 Figure 3 The structure of granule with different starches under different time Conclusion The results presented that the length of starch granular was enzymatically debranched the structure of corn starch modified by α-amylase and the mechanical properties was improved.
Miller, Use of dinitrosalicylic acid reagent for determination of reducing sugar, Analytical Chemistry 31 (March (3)) (1959) 426–428
The result showed that structure of modified starch was conserved with hydrolytic time increased, whereas tensile strength were increased and viscosity was decreased.
The granular structure was conserved after high activity enzymatic modification for maize [5].
(A) t0 (B) t30 (C) t60 (D) t90 (E) t120 Figure 3 The structure of granule with different starches under different time Conclusion The results presented that the length of starch granular was enzymatically debranched the structure of corn starch modified by α-amylase and the mechanical properties was improved.
Miller, Use of dinitrosalicylic acid reagent for determination of reducing sugar, Analytical Chemistry 31 (March (3)) (1959) 426–428