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Online since: February 2013
Authors: Yan Qing Niu, Zhong Su Ma, Zhe Wang, Zi Xuan Lian, Tian Zhong
When treatment conditions were more intense, SA molecules aggregation and self-association tended to gradual destruction, and the laminar structure became less conspicuous.
The more homogeneous distribution of SA and the plasticizer particles gave rise to an increase of the hydrogen bonds between molecules and formed a more ordered and tightly cross-linking structure in the MC matrix, which promoted interactions between them significantly.
It can be attributed to that the excessive treatment leaded to a disruption of chemical bonds in MC chains and destroyed the solid polysaccharide structure.
And the fact that US induces the disruption in the secondary and tertiary structures of proteins, has been reported by several researchers [9,10].
Journal of Agricultural and Food Chemistry, 1997. 45(3): p. 685-689
The more homogeneous distribution of SA and the plasticizer particles gave rise to an increase of the hydrogen bonds between molecules and formed a more ordered and tightly cross-linking structure in the MC matrix, which promoted interactions between them significantly.
It can be attributed to that the excessive treatment leaded to a disruption of chemical bonds in MC chains and destroyed the solid polysaccharide structure.
And the fact that US induces the disruption in the secondary and tertiary structures of proteins, has been reported by several researchers [9,10].
Journal of Agricultural and Food Chemistry, 1997. 45(3): p. 685-689
Online since: June 2020
Authors: Ilmārs Zālīte, Māra Lubāne, Anita Letlena, Ints Šteins, Jānis Grabis, Aija Krūmiņa
Synthesis and Spark Plasma Sintering of Nanosized Refractory Carbide/Nitride Powders
Ilmārs Zālītea*, Anita Letlenab, Ints Šteinsc, Aija Krūmiņad,
Māra Lubānee, Jānis Grabisf
Institute of Inorganic Chemistry, Riga Technical University,
P.
One of the ways to produce materials with fine-grained structure is application of nanoparticles as a raw component in a compacting process [4].
Similar changes of chemical composition, phase composition, and structure are also observed for other carbides.
During the sintering of samples obtained by plasma-chemical synthesis, grain recrystallization and structure formation can be observed.
Studies have shown SPS of nanopowders allows to lower the sintering temperature and, in some cases, to obtain a relatively dense material with a relatively fine-grained structure.
One of the ways to produce materials with fine-grained structure is application of nanoparticles as a raw component in a compacting process [4].
Similar changes of chemical composition, phase composition, and structure are also observed for other carbides.
During the sintering of samples obtained by plasma-chemical synthesis, grain recrystallization and structure formation can be observed.
Studies have shown SPS of nanopowders allows to lower the sintering temperature and, in some cases, to obtain a relatively dense material with a relatively fine-grained structure.
Online since: October 2014
Authors: Pavel Liška, Barbora Nečasová, Jiří Šlanhof
Other fields of industry, such as mechanical engineering, chemistry and glass-making, became involved in construction.
For the prefabricated systems produced, lightweight external shells were the ideal type of structure.
Unfortunately, due to a lack of discipline during the construction process, the low durability of the materials used, the poor refinement of construction details and the poor thermal design parameters of structures, many problems arose which resulted in the gradual degradation of structures and an increase in demand for their revitalization.
Test for the Adhesion of the Surface Finish of Building Structures to the Substrate.
Test for surface finish adhesion of building structures to the base.
For the prefabricated systems produced, lightweight external shells were the ideal type of structure.
Unfortunately, due to a lack of discipline during the construction process, the low durability of the materials used, the poor refinement of construction details and the poor thermal design parameters of structures, many problems arose which resulted in the gradual degradation of structures and an increase in demand for their revitalization.
Test for the Adhesion of the Surface Finish of Building Structures to the Substrate.
Test for surface finish adhesion of building structures to the base.
Online since: July 2011
Authors: Da Biao Zhao
The structure of SAR was determined by FTIR.
Furthermore, the strong acidity will destroy the chain structure of cellulose.
Structure Analysis.
The structure of SAR was confirmed by FTIR: λ=1716cm-1(>C=O); 518, 761 and 855 are attributed to starch.
Chemistry, (2003), p. 598-605
Furthermore, the strong acidity will destroy the chain structure of cellulose.
Structure Analysis.
The structure of SAR was confirmed by FTIR: λ=1716cm-1(>C=O); 518, 761 and 855 are attributed to starch.
Chemistry, (2003), p. 598-605
Online since: September 2011
Authors: Ming Han, Chang Yun Miao, Jing Min Chang
Corresponding to the structure chart of automatic control system, we can draw a general form of motion control system as a block diagram, as shown in fig.1.
Typical drive mode of the traditional roving frame adopt soft up, electromagnetic brake and mechanical sector, with the problem of complex structure, large amount of maintenance and the ineradicable thickness of the knot.
Moreover, because the structure uses a mechanical drive, winding speed is not high.
Currently, this pine-style winding has been completely using all digital winding structure abroad which based on electronic gear and electronic cam, that is, independent rotation of single spindle.
Fibre Chemistry, 2006 ( 2) : 83-86
Typical drive mode of the traditional roving frame adopt soft up, electromagnetic brake and mechanical sector, with the problem of complex structure, large amount of maintenance and the ineradicable thickness of the knot.
Moreover, because the structure uses a mechanical drive, winding speed is not high.
Currently, this pine-style winding has been completely using all digital winding structure abroad which based on electronic gear and electronic cam, that is, independent rotation of single spindle.
Fibre Chemistry, 2006 ( 2) : 83-86
Online since: July 2012
Authors: Luqman Musa, Ismail Khairul Nizar, C.Y. Heah, A.M. Mustafa Al Bakri, Y.M. Liew, H. Kamarudin, Che Mohd Ruzaidi Ghazali, M. Binhussain
Introduction
In 1972, Joseph Davidovits coined the name “geopolymers” [1], describing the alumino-silicates polymers which consist of amorphous and three dimensional structure formed from the geopolymerization process of alumino-silicates monomers in alkaline solution [2].
The activation of the calcined kaolin caused changed in edges of the plate-like structure of the calcined kaolin.
The poor contact between the reacting materials hinders the formation of more homogeneous structure.
· Microstructure showed the growth of the structure into a more homogeneous structure with lesser un-reacted raw materials from the calcined kaolin geopolymeric powder into the resulted geopolymer paste.
Journal of Material Chemistry, 2003. 13: p. 1161-1165
The activation of the calcined kaolin caused changed in edges of the plate-like structure of the calcined kaolin.
The poor contact between the reacting materials hinders the formation of more homogeneous structure.
· Microstructure showed the growth of the structure into a more homogeneous structure with lesser un-reacted raw materials from the calcined kaolin geopolymeric powder into the resulted geopolymer paste.
Journal of Material Chemistry, 2003. 13: p. 1161-1165
Online since: June 2011
Authors: Bao Zhong Liu, Bao Qing Zhang, Yan Ping Fan
Introduction
Ti-based I-phase alloys were considered as the most promising hydrogen storage materials due to thermodynamical stability, suitable chemistry affinity and low cost.
Wang et al. [3] had investigated that the effect of additive Y on crystalline structure of Ti-Zr-Ni alloy, and pointed out additive Y would improve the amorphous forming ability.
Here, phase structure and electrochemical hydrogen storage property of the Ti45Zr30Ni25RE3 (Y, La) alloys were investigated.
Results and Discussion Phase Structure.
Conclusions Ti45Zr30Ni25, Ti45Zr30Ni25La3 and Ti45Zr30Ni25Y3 alloys were prepared by melt-spun methods, and phase structure and electrochemical performance were investigated.
Wang et al. [3] had investigated that the effect of additive Y on crystalline structure of Ti-Zr-Ni alloy, and pointed out additive Y would improve the amorphous forming ability.
Here, phase structure and electrochemical hydrogen storage property of the Ti45Zr30Ni25RE3 (Y, La) alloys were investigated.
Results and Discussion Phase Structure.
Conclusions Ti45Zr30Ni25, Ti45Zr30Ni25La3 and Ti45Zr30Ni25Y3 alloys were prepared by melt-spun methods, and phase structure and electrochemical performance were investigated.
Online since: November 2011
Authors: Wen Deng, Yu Yang Huang, Xiao Lei Guo, Bing Xie, Ding Kang Xiong
Careful control of alloy chemistry and heat treatment can generate three general microstructure types: equiaxed g, duplex and fully lamellar [3].
Among these, the duplex structure, a2 (Ti3Al) + g (TiAl), has the highest plasticity at room temperatures [4,5].
The electronic structure of TiAl alloy has been calculated using a variety of computational methods [9,10].
However, experimental studies of the electronic structures of Ti-Al alloys are very limited.
De Hosson, Interfacial Structure, Properties and Design (edited by M.
Among these, the duplex structure, a2 (Ti3Al) + g (TiAl), has the highest plasticity at room temperatures [4,5].
The electronic structure of TiAl alloy has been calculated using a variety of computational methods [9,10].
However, experimental studies of the electronic structures of Ti-Al alloys are very limited.
De Hosson, Interfacial Structure, Properties and Design (edited by M.
Online since: February 2014
Authors: Yue Shi, Hui Qin Lian, Xiu Guo Cui, Lei Zu, Yang Liu, Rui Rui Li
These various outstanding properties could be obtained simply by varying their chemical composition, morphology, and inner structure of the composite materials [4] [5].
Remarkably, some different structures of BPAPC could be used as the adsorbent for radioactive noble gases [8], such as 85Kr, 133Xe and 222Rn in air and water.
As can be seen clearly, all the samples possess an irregular block morphology and no clearly BPAPC could be observed, indicating a well nanocomposite structure.
It is present clearly that all the samples are of type IV and display a distinct hysteresis loops of H2 in the range of 0.4-1.0P/Po which indicates a mesoporous structure.
The pore diameter distribution curves of the samples which calculated from desorption branches show a sharp peak around 3.5nm, suggesting a mesoporous structure and the narrow pore diameter distribution of the BPAPC-silica nanocomposites.
Remarkably, some different structures of BPAPC could be used as the adsorbent for radioactive noble gases [8], such as 85Kr, 133Xe and 222Rn in air and water.
As can be seen clearly, all the samples possess an irregular block morphology and no clearly BPAPC could be observed, indicating a well nanocomposite structure.
It is present clearly that all the samples are of type IV and display a distinct hysteresis loops of H2 in the range of 0.4-1.0P/Po which indicates a mesoporous structure.
The pore diameter distribution curves of the samples which calculated from desorption branches show a sharp peak around 3.5nm, suggesting a mesoporous structure and the narrow pore diameter distribution of the BPAPC-silica nanocomposites.
Online since: March 2013
Authors: Yun Wang, Shou Peng
CTIEC also pay attention to develop industry standard of hollow glass microspheres with Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences.
The Mercury-injection Apparatus is a advanced equipment which can determine material internal microscopic pore structure by mercury-injection method.
It can not only determine bulk materials’ but also powder materials’ microscopic pore structure.
Li Analysis of Error for Pore Structure of Porous Materials Measured by MIP Bulletin of The Chinese Ceramic Society No.4 Vol.25 (2006) 198-207
Wang, Mercury Determination the Error of Structure of Porous Material Guang Zhou Chemical Industry No.1 Vol.37 (2009) 109-111
The Mercury-injection Apparatus is a advanced equipment which can determine material internal microscopic pore structure by mercury-injection method.
It can not only determine bulk materials’ but also powder materials’ microscopic pore structure.
Li Analysis of Error for Pore Structure of Porous Materials Measured by MIP Bulletin of The Chinese Ceramic Society No.4 Vol.25 (2006) 198-207
Wang, Mercury Determination the Error of Structure of Porous Material Guang Zhou Chemical Industry No.1 Vol.37 (2009) 109-111