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Online since: October 2012
Authors: Huan Li, Hai Feng Li, Xuan Zhong, Xin Da Li, Magdi E. Gibril, Yue Zhang, Ke Qing Han, Mu Huo Yu
However, Cellulose has an extensive hydrogen-bonded and partially crystallized structure makes it non-melt-processable, it still remains a great challenge [1].
The common way to get thermoplastic products from cellulose is chemical modification, of which esterification is the primary chemistry for transformation of cellulose [2].
The functional groups and structure of the graft cellulose can be seen by ATR-FITR.
(2) Results obtained from ATR-FTIR and TG analysis confirmed the structure of maleylation celluloses with carbon-carbon double bond and carboxyl groups.
The common way to get thermoplastic products from cellulose is chemical modification, of which esterification is the primary chemistry for transformation of cellulose [2].
The functional groups and structure of the graft cellulose can be seen by ATR-FITR.
(2) Results obtained from ATR-FTIR and TG analysis confirmed the structure of maleylation celluloses with carbon-carbon double bond and carboxyl groups.
Online since: December 2013
Authors: Guang Yong Zhu, Wan Long Liu, Zuo Bing Xiao, Ru Jun Zhou, Er Qin Wang, Yun Wei Niu
For example Saravanan and Rao [10] selected three different water solubility drugs as core material with gelatin and pectin at all acidifiers, and Silva et al [11] obtained spherical microcapsules with a defined wall and core structure containing lycopene by complex coacervation using gelatin and pectin as encapsulating agents at a final pH of 3.0.
The structure and shape of the moist microcapsules were determined by a GOLDROOM binocular microscope GR-PL15 (Shanghai, China).
The wall of compact structure is beneficial to enhance the barrier property of the CO-load microcapsules to guaranteed the effective protection and retention of the CO, while the wrinkled surface of microcapsules is advantageous for the diffusion of encapsulated CO.
Gunko (Eds.), Surface Chemistry in Biomedical and Environmental Science, Springer Publising Inc., Heidelberg, 2006, pp. 23 34
The structure and shape of the moist microcapsules were determined by a GOLDROOM binocular microscope GR-PL15 (Shanghai, China).
The wall of compact structure is beneficial to enhance the barrier property of the CO-load microcapsules to guaranteed the effective protection and retention of the CO, while the wrinkled surface of microcapsules is advantageous for the diffusion of encapsulated CO.
Gunko (Eds.), Surface Chemistry in Biomedical and Environmental Science, Springer Publising Inc., Heidelberg, 2006, pp. 23 34
Online since: December 2013
Authors: Bao Dong Cheng, Yue Wang, Wen Hua Song, Xiang Jie Song
Heat Treatment of Fire Explosion Hazard Analysis and Countermeasures
Yue Wang1,2, a, Wenhua Song1,b,Baodong Cheng3,Xiangjie Song3
1Environment and Chemistry College,Tianjin Polytechnic University Tianjin, 300387, China
2 School of Control and Mechanical Engineering ,Tianjin Chengjian University Tianjin, 300384,China
3Tianjin Huateng Technology Safety Science & Technology Consulting Co.
(3) the structure importance Shielding gas fire explosion fault tree structure important degree of order: I(2)=I(3)=I(4)=I(1)>I(5)=I(7)=I(8)=I(9)=I(6)>I(11)=I(10) Quenching oil pool fire fault tree structure important degree of order: I(1)=I(6)=I(3)=I(5)=I(9)=I(4)=I(2)>I(10)=I(7)=I(11)=I(8) conclusion By the HAZOP combined with fault tree analysis, once out of control in the process of heat treatment will be a fire and explosion accidents.
(3) the structure importance Shielding gas fire explosion fault tree structure important degree of order: I(2)=I(3)=I(4)=I(1)>I(5)=I(7)=I(8)=I(9)=I(6)>I(11)=I(10) Quenching oil pool fire fault tree structure important degree of order: I(1)=I(6)=I(3)=I(5)=I(9)=I(4)=I(2)>I(10)=I(7)=I(11)=I(8) conclusion By the HAZOP combined with fault tree analysis, once out of control in the process of heat treatment will be a fire and explosion accidents.
Online since: June 2012
Authors: Xuan Qing Hong, Xu Sheng Wang, Xiang Ming Li, Rui Chen, Xi Yao, Zhao Jin Sun, Jian Qiang Guo
It was shown that this strategy was useful in the dynamics and control of flexible structures [7].
Use of the damping material is the most common approach to incorporate an energy dissipation mechanism into the structure.
In passive energy dissipation applications, the piezoelectric materials are embedded in or bonded to the matrix material or structure, the electrodes of the composites are shunted with electric circuits.
Baetzold (Eds.), Determination of Elastic and Mechanical Properties, Volume 7 of Physical Methods of Chemistry, 2nd ed., John Wiley & Sons (1991) [10] H.H.
Use of the damping material is the most common approach to incorporate an energy dissipation mechanism into the structure.
In passive energy dissipation applications, the piezoelectric materials are embedded in or bonded to the matrix material or structure, the electrodes of the composites are shunted with electric circuits.
Baetzold (Eds.), Determination of Elastic and Mechanical Properties, Volume 7 of Physical Methods of Chemistry, 2nd ed., John Wiley & Sons (1991) [10] H.H.
Online since: July 2011
Authors: Hou Bin Li, Xing Hai Liu, Chi Huang, Ya Lan Zhong, Xin Liu, Yi Fu Zhang
Synthesis of VO2(A) Nanostructures by a Hydrothermal Method and Their Transition to VO2(M)
Yalan zhong1,a, Yifu zhang1,b, Xin Liu2,c, Xinghai Liu3,d*, Chi Huang1,e and Houbin Li3,f
1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
2National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
3School of Printing and Packaging, Wuhan University, Wuhan 430079, PR China
aylzhong@whu.edu.cn, b zhyifu@whu.edu.cn, cxliu@mail.hust.edu.cn, dliuxh@whu.edu.cn, echihuang@whu.edu.cn, flhb@whu.edu.cn
Keywords: Vanadium oxides; VO2(A); VO2(M); Nanomaterials; Hydrothermal method; Phase transition
Abstract.
With the SMT, it has an associated change from the monoclinic symmetry VO2(M) (P21/c) to the tetragonal rutile structure VO2(R) (P42/mnm).
While the synthesis, structures, properties and applications of VO2(M/R) had been extensively researched, other metastable polymorphs of VO2, which may also have scientific importance and potential applications, have been less reported comparatively.
Oka et al. studied the structures of low-temperature and high-temperature VO2(A) phases [11,12].
With the SMT, it has an associated change from the monoclinic symmetry VO2(M) (P21/c) to the tetragonal rutile structure VO2(R) (P42/mnm).
While the synthesis, structures, properties and applications of VO2(M/R) had been extensively researched, other metastable polymorphs of VO2, which may also have scientific importance and potential applications, have been less reported comparatively.
Oka et al. studied the structures of low-temperature and high-temperature VO2(A) phases [11,12].
Online since: August 2014
Authors: Shi Wei Wu, Zhong Qiu Cao, Tian Le Li, Shen Shen Li, Yan Wang
Doping with Metal and Compound to Improve the Properties of Hydrogen Storage of MgH2
Wang Yan 1, a, Wu Shiwei2, b, Li Tianle1, c, Li Shenshen1, d and Cao Zhongqiu1, e
1College of Chemistry and Life Science, Shenyang Normal University, Shenyang 110034, China;
2Experimental Center, Shenyang Normal University, Shenyang 110034, China.
As shown in eqn (1), the reaction of Mg and hydrogen forms the MgH2, The structure model sketch of the phase transformation from Mg to MgH2 is illustrated in Fig. 1
Zhou et al.[7] investigate the energy and electronic structure of magnesium MgH2 alloyed by X( X= Si, Ge, Sn, Pb) based on the density functional theory.
So we can consider preparation methods, structure, technological parameter, specific surface area, grain size and so on, to improve the hydrogen storage properties of MgH2.
As shown in eqn (1), the reaction of Mg and hydrogen forms the MgH2, The structure model sketch of the phase transformation from Mg to MgH2 is illustrated in Fig. 1
Zhou et al.[7] investigate the energy and electronic structure of magnesium MgH2 alloyed by X( X= Si, Ge, Sn, Pb) based on the density functional theory.
So we can consider preparation methods, structure, technological parameter, specific surface area, grain size and so on, to improve the hydrogen storage properties of MgH2.
Online since: April 2013
Authors: A. Norhidayah, R. Ahmad, Mohamad Rusop, Saifollah Abdullah, M.Z. Borhan
Abdullah2ψ
1NANO-SciTech Centre (NST), Institute of Science;
2NANO-Invention Centre (NIT), Faculty of Applied Sciences;
3School of Chemistry and Environmental Studies, Faculty of Applied Sciences;
Universiti Teknologi MARA (UiTM) Malaysia, 40450 Shah Alam, Selangor, Malaysia.
This difficulty is arising from the herbal plant structure itself which are rhizomatic and fibrous material [4].
This increases due to the both nanonization effects and the conversion asiaticoside structure to asiatic acid.
This was also supported by the phenomena where the destruction of a cell wall structure of plant cell causes the active compound in inner of cytoplasm can be exposed directly while not being released from cell-walls, thus could make effective ingredient's dissolve-out rapidly [9].
This difficulty is arising from the herbal plant structure itself which are rhizomatic and fibrous material [4].
This increases due to the both nanonization effects and the conversion asiaticoside structure to asiatic acid.
This was also supported by the phenomena where the destruction of a cell wall structure of plant cell causes the active compound in inner of cytoplasm can be exposed directly while not being released from cell-walls, thus could make effective ingredient's dissolve-out rapidly [9].
Online since: March 2014
Authors: Xu Sheng Yao, Lai Xia Yang, Ying Bao Xue
Introduction
Rapid prototyping technology is the use of computer data by using the method of layer by layer stacking materials manufacturing entity objects of a new digital manufacturing technology, it breaks through the traditional cutting mode, can greatly reduce the processing process, shorten the development cycle of new products, especially for complex structure, difficult processing of products can be personalized, customized production, thereby may change the traditional way of large-scale mass production, so it is considered to be "one of the important sign of the third industrial revolution".
Sucrose Sucrose is a kind of important raw materials and a large number of sweet widely applied in food industry, its chemical formula is C12H22O11, it is a non reducing sugar formed by two glucose and fructose by annoyers hydroxyl condensation, is colorless and transparent monoclinic crystal, molecular structure as shown in figure 1.
Figure 1: Molecular structure of sucrose Sucrose in the heat, acid, alkali, yeast and other function, can produce various types of reactions.
[4] Roos.Comment on the Melting and Decomposition of Sugars, Agricultural and Food chemistry, 2012, 60:10359-10362
Sucrose Sucrose is a kind of important raw materials and a large number of sweet widely applied in food industry, its chemical formula is C12H22O11, it is a non reducing sugar formed by two glucose and fructose by annoyers hydroxyl condensation, is colorless and transparent monoclinic crystal, molecular structure as shown in figure 1.
Figure 1: Molecular structure of sucrose Sucrose in the heat, acid, alkali, yeast and other function, can produce various types of reactions.
[4] Roos.Comment on the Melting and Decomposition of Sugars, Agricultural and Food chemistry, 2012, 60:10359-10362
Online since: June 2014
Authors: Feng Fu, Dan Jun Wang, Li Guo, Xiao Mei He, Lin Lin Yue
Synthesis of AgBr/Bi2WO6 Heterojunction with Enhanced
Photocatalytic Activities for Methyl Orange
Dan Jun WANGa*, Xiao Mei HEb, Li GUOc, Feng FUd*, Lin Lin YUEe
College of Chemistry &Chemical Engineering, Yan' an University, Shaanxi Key
Laboratory of Chemical Reaction Engineering, Yan' an 716000
aemail: wangdj761118@163.com, bemail: happyxiaomerry0324@163.com,
cemail:guoli761118@163.com, demail: yadxfufeng@126.com,eemail: min_gtianhao@126.com
Keywords: Bismuth molybdate; Hydrothermal process; Heterojunction; Photocatalytic activity
Abstract: AgBr nanoparticle decorated mesoporous Bi2WO6 architectures was fabricated via a facile precipitation-deposition process.
The phase structure, crystallinity and purity of as-obtained AgBr/Bi2WO6 were examined by XRD measurement.
It reveals that some small spherical heteroparticles with size of about 10 nm covered over the surface of Bi2WO6 architectures, indicating that AgBr nanodots were highly dispersed on the surface of Bi2WO6 nanoarchitectures and formed the heterojunction structure, which is well consistent with the XRD result (Fig.1e).
Therefore, with the combination of the XRD, SEM, EDS and TEM investigation, the results confirmed that there were both Bi2WO6 and AgBr species in the heterojunction structure.
The phase structure, crystallinity and purity of as-obtained AgBr/Bi2WO6 were examined by XRD measurement.
It reveals that some small spherical heteroparticles with size of about 10 nm covered over the surface of Bi2WO6 architectures, indicating that AgBr nanodots were highly dispersed on the surface of Bi2WO6 nanoarchitectures and formed the heterojunction structure, which is well consistent with the XRD result (Fig.1e).
Therefore, with the combination of the XRD, SEM, EDS and TEM investigation, the results confirmed that there were both Bi2WO6 and AgBr species in the heterojunction structure.
Online since: September 2014
Authors: Maviael Jose Silva, Signo Tadeu dos Reis, Sonia R.H. de Mello-Castanho
It is well known that the chemical composition plays an important role in the corrosion behavior of glasses [3].However, how the amorphous structure affects the corrosion behavior of glasses is a long-term puzzling problem.
The XRD patterns of the as-prepared BAS- glasses (not shown) depicted the appearance of a broad halo at the angle of 2q ≈ 30º and the absence of any diffraction peaks associated with crystalline phases indicate that the amorphous structure was formed in the annealed glasses.
The effects of Al2O3 on the glass structure were investigated.
Desouky: Materials Chemistry and Physics Vol. 82 (2) (2003), p. 375
The XRD patterns of the as-prepared BAS- glasses (not shown) depicted the appearance of a broad halo at the angle of 2q ≈ 30º and the absence of any diffraction peaks associated with crystalline phases indicate that the amorphous structure was formed in the annealed glasses.
The effects of Al2O3 on the glass structure were investigated.
Desouky: Materials Chemistry and Physics Vol. 82 (2) (2003), p. 375