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Online since: February 2008
Authors: Ali Shokuhfar, Mohammad Reza Vaezi, A. Esmaielzadeh Kandjani, M. Farzalipour Tabriz
In Fig. 4 the structure of surfactants which were used in this study is shown.
They form spatial structures (stereo-chemical effects) with −2 4)(OHZn and so they control their morphologies while their growth under solvothermal and hydrothermal at elevated temperatures.
Fig. 3 Surfactants' Structures.
Polymer protective mechanisms originate from colloidal chemistry.
PVP is thought to act as a template too, which can form chain structures.
They form spatial structures (stereo-chemical effects) with −2 4)(OHZn and so they control their morphologies while their growth under solvothermal and hydrothermal at elevated temperatures.
Fig. 3 Surfactants' Structures.
Polymer protective mechanisms originate from colloidal chemistry.
PVP is thought to act as a template too, which can form chain structures.
Online since: December 2012
Authors: Xiao Dong Zhang, Lei Chen, Bao Feng Zhao, Guang Fan Meng, Hong Yu Si, Min Xu
According to the similarity in molecule structure, character and conversion behavior of components, tar can be divided into several lumps.
Under the similar reaction condition, the n-heptane conversion is significantly higher than that of toluene, which can be related to their different chemical molecular structure.
Toluene with an aromatic ring is a more stable chemical structure than n-heptane with the straight-chain structure
[8] Zhang Xiaodong, Zhou Jinsong, Luo Zhongyang, et.al, Constitution variation of tar from catalytic cracking of biomass, Journal of Fuel Chemistry and Technology,2005,33(5),582-585
Under the similar reaction condition, the n-heptane conversion is significantly higher than that of toluene, which can be related to their different chemical molecular structure.
Toluene with an aromatic ring is a more stable chemical structure than n-heptane with the straight-chain structure
[8] Zhang Xiaodong, Zhou Jinsong, Luo Zhongyang, et.al, Constitution variation of tar from catalytic cracking of biomass, Journal of Fuel Chemistry and Technology,2005,33(5),582-585
Online since: January 2015
Authors: Enrico Volpi, Matteo Stefanoni, Andrea Olietti, Stefano Trasatti
Enrico Volpia*, Matteo Stefanonib, Andrea Oliettic
and Stefano Trasattid
Department of Chemistry, Università degli Studi di Milano, Italy
a*enrico.volpi@unimi.it, bmatteo.stefanoni@studenti.unimi.it, candrea.olietti@studenti.unimi.it, dstefano.trasatti@unimi.it
Keywords: steel reinforcing bar corrosion; simulated concrete pore solution; steel passivation; microbial corrosion.
Reinforced concrete structures are subject to intense deterioration when exposed to a microbial environment.
Introduction Although much less investigated than that induced by chlorides, the corrosion of steel reinforcing bars due to bacteria metabolic products is recognised as a serious issue strongly affecting the service life of sewer pipes, waste water treatment plants, animal housing and manure storage structures.
The microbial deterioration of reinforced concrete structures is commonly attributed to bacteria involved in the sulfur cycle, in particular Sulfate Reducing Bacteria (SRB) that transform sulfates into sulfides and Sulfur Oxidizing Bacteria (SOB), whose final metabolic product is sulfuric acid.
Sonck, Durability of Building Materials and Components in the Agricultural Environment, Part III: Concrete Structures J.
Reinforced concrete structures are subject to intense deterioration when exposed to a microbial environment.
Introduction Although much less investigated than that induced by chlorides, the corrosion of steel reinforcing bars due to bacteria metabolic products is recognised as a serious issue strongly affecting the service life of sewer pipes, waste water treatment plants, animal housing and manure storage structures.
The microbial deterioration of reinforced concrete structures is commonly attributed to bacteria involved in the sulfur cycle, in particular Sulfate Reducing Bacteria (SRB) that transform sulfates into sulfides and Sulfur Oxidizing Bacteria (SOB), whose final metabolic product is sulfuric acid.
Sonck, Durability of Building Materials and Components in the Agricultural Environment, Part III: Concrete Structures J.
Online since: August 2014
Authors: De Qing Xie, Guang Yan Li, Yun Sheng Zhang, Peng Zhao
The fact that these structures remain intact and stable after thousands of years’ wind and rain has proved the durability and fine strength of pig blood–lime mortar material.
Considering its outstanding advantages, specifically its compatibility with the original structures and durability, traditional lime technology has drawn more and more attention in heritage conservation.
Conclusion The particle size of calcium carbonate generated from carbonation reaction of Ca(OH)2 in calcite crystalline form is nanometer due to the participation of additives, which is much smaller and more compact than that is generated in lime mortar without blood material.Therefore, the compact structure of CaCO3 particles of blood material-lime mortar is the micro explanation of its improvement in the physical properties such as compressive strength and flexural strength.
Chemistry protection of stone cultural relics protection, Palace Museum. 3 (2000) 76-79.
Yang, Studies on the traditional techniques and the conservation method of polychrome paintings on wooden structures of Chinese traditional buildings.
Considering its outstanding advantages, specifically its compatibility with the original structures and durability, traditional lime technology has drawn more and more attention in heritage conservation.
Conclusion The particle size of calcium carbonate generated from carbonation reaction of Ca(OH)2 in calcite crystalline form is nanometer due to the participation of additives, which is much smaller and more compact than that is generated in lime mortar without blood material.Therefore, the compact structure of CaCO3 particles of blood material-lime mortar is the micro explanation of its improvement in the physical properties such as compressive strength and flexural strength.
Chemistry protection of stone cultural relics protection, Palace Museum. 3 (2000) 76-79.
Yang, Studies on the traditional techniques and the conservation method of polychrome paintings on wooden structures of Chinese traditional buildings.
Online since: October 2007
Authors: Tohru Yamasaki, Akihisa Inoue, Takeshi Fukami, Osami Haruyama, Daisuke Okai, M. Fukatani
Inoue
3
1Department of Materials Science & Chemistry, Graduate School of Engineering,
University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan
2
Department of Physics, Tokyo University of Science, Noda 278-8510, Japan
3
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
a fukami@eng.u-hyogo.ac.jp
Keywords: Pd44Cu31Ni8P17, Elastic stiffness constant, Ultrasonic velocity, Mechanical
resonance of ultrasonic wave
Abstract.
Until now, it has been clarified that the metallic glasses are composed of some noticed peculiar atomic configuration and have the following peculiar structure, (1) a sophisticated high density and disordered packing structure compared with ordinary amorphous materials [17] and (2) a new local arrangement of atoms which has not been observed for crystals in thermal equilibrium [18].
Low values of mechanical constants except υand high value of υof Pd based metallic alloys compared with the crystallized one are caused from these peculiar amorphous structures.
The characteristic mechanical properties of amorphous Pd44Cu31Ni8P17 disappear in the crystallized sample by loosing the peculiar structure of amorphous state.
Until now, it has been clarified that the metallic glasses are composed of some noticed peculiar atomic configuration and have the following peculiar structure, (1) a sophisticated high density and disordered packing structure compared with ordinary amorphous materials [17] and (2) a new local arrangement of atoms which has not been observed for crystals in thermal equilibrium [18].
Low values of mechanical constants except υand high value of υof Pd based metallic alloys compared with the crystallized one are caused from these peculiar amorphous structures.
The characteristic mechanical properties of amorphous Pd44Cu31Ni8P17 disappear in the crystallized sample by loosing the peculiar structure of amorphous state.
Online since: August 2009
Authors: Yi Sun, Shou Hua Sun, Wei Li Xie, Xiao Rong Wu
Introduction
In recent years, many efforts have been undertaken to develop restorative composites to be showing
physico-mechanical properties similar to those of the natural tooth structures.
It is probably because the special rigid Fig.3 Mechanical properties: (a) flexural cubic structure of POSS improved the hardness of the strength, (b)compressive strength and matrix.
This is an important finding for the clinical perspective because that, in some structures of dentures, toughness of material is a desired property.
Their flexible long chain structures may provide Table 2 Properties of the dental nanocomposites better toughness for the resin matrix.
Chemistry of Materials(1996), 8, p.1592 [3] F.
It is probably because the special rigid Fig.3 Mechanical properties: (a) flexural cubic structure of POSS improved the hardness of the strength, (b)compressive strength and matrix.
This is an important finding for the clinical perspective because that, in some structures of dentures, toughness of material is a desired property.
Their flexible long chain structures may provide Table 2 Properties of the dental nanocomposites better toughness for the resin matrix.
Chemistry of Materials(1996), 8, p.1592 [3] F.
Online since: April 2014
Authors: Fatin Hana Naning, Azyuni Aziz, Reza Zamiri, Syed Abdul Malik
Surface morphology and structure of P3HT: ZnO nanorod and P3HT: ZnO nanosphere were then compared -by using FESEM, EDX and RAMAN spectroscopy.
Quartz PEDOT: PSS Active layer Fig. 1: Structure of sample, quartz-/ PEDOT: - PSS/ active layer (P3HT or P3HT: ZnO nanorod or P3HT: ZnO nanosphere) All samples were characterized by FESEM model SU 8020 UHRdel Hitachi to determine the shape and size of nanorod and nanosphere in P3HT, and EDX.
Arendse, S.E.Mavundla, Determination of structure, morphology and complex refractive index in ZnO-nanopencils/P3HT hybrid structures, Materials Chemistry and Physics. 135 (2012) 401-410.
Quartz PEDOT: PSS Active layer Fig. 1: Structure of sample, quartz-/ PEDOT: - PSS/ active layer (P3HT or P3HT: ZnO nanorod or P3HT: ZnO nanosphere) All samples were characterized by FESEM model SU 8020 UHRdel Hitachi to determine the shape and size of nanorod and nanosphere in P3HT, and EDX.
Arendse, S.E.Mavundla, Determination of structure, morphology and complex refractive index in ZnO-nanopencils/P3HT hybrid structures, Materials Chemistry and Physics. 135 (2012) 401-410.
Online since: September 2011
Authors: Ming Hua Bai, Jun Li Ge, Zhi Qiang Liu, Jing Jing Liu, Zhi Ming Zhang
Research on Inner Cooling Apparatus Sets in the Mold of 700mm×700mm Bloom
Bai Minghua1, a, Liu Jingjing1, b, Ge Junli1, Liu Zhiqiang1, Zhang Zhiming1,2
1College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2College of Environment &Chemistry Engineering, Yanshan University, Qinhuangdao 066004, China
abmh@ysu.edu.cn, bljj6236615@126.com
Key words: Bloom continuous casting, Heat transfer, Inner cooling, Liquid core calculation
Abstract.
The structure profile of composite mould A new mold has been advance based on mold thermoanalysis and the features of bloom casting for 700mm×700mm super-large billet that is complex mold in which set an inner cooling, the dimensions of inner cooling is 230mm×230mm, the height is 200mm, deflected SEN has been set as well.
The profile of structure of mould is given in Fig.2.
Theoretically Analyze the Structure of New Mould.
Compared with fed-wire, added-iron sand, which bring new oxide, by contrast, this kind of crystal become the best kind of ideal crystal because it owns the same ingredient and structure as molted steel.
The structure profile of composite mould A new mold has been advance based on mold thermoanalysis and the features of bloom casting for 700mm×700mm super-large billet that is complex mold in which set an inner cooling, the dimensions of inner cooling is 230mm×230mm, the height is 200mm, deflected SEN has been set as well.
The profile of structure of mould is given in Fig.2.
Theoretically Analyze the Structure of New Mould.
Compared with fed-wire, added-iron sand, which bring new oxide, by contrast, this kind of crystal become the best kind of ideal crystal because it owns the same ingredient and structure as molted steel.
Online since: December 2012
Authors: Xue Feng Bai, Xian Da Li
Photocatalytic Reduction of CO2 over CdxZn1-xS Photocatalysts
Xue-feng Bai 1,2,a, Xian-da Li 2,b
1Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin 150040, China;
2School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, China
abxuefeng@163.net,bliyonglin_88@163.com
Keywords: CdxZn1-xS; photocatalysis; CO2 reduction
Abstract: A series of CdxZn1-xS (x=0.1~0.9) composite photocatalysts were prepared by coprecipitation method.
It is obvious that the prepared photocatalysts are solid solution structure, and neither pure CdS nor pure ZnS phase exists.
The crystal structure of CdxZn1-xS photocatalysts is hexagonal like greenockite-type CdS.
The band structure could be controlled in CdxZn1-xS photocatalysts by adjusting the ratio of Cd/Zn.
Band Structure-Controlled Solid Solution of Cd1-x ZnxS Photocatalyst for Hydrogen Production by Water Splitting.
It is obvious that the prepared photocatalysts are solid solution structure, and neither pure CdS nor pure ZnS phase exists.
The crystal structure of CdxZn1-xS photocatalysts is hexagonal like greenockite-type CdS.
The band structure could be controlled in CdxZn1-xS photocatalysts by adjusting the ratio of Cd/Zn.
Band Structure-Controlled Solid Solution of Cd1-x ZnxS Photocatalyst for Hydrogen Production by Water Splitting.
Online since: May 2014
Authors: Ping Lan, Yu Xian Feng, Ri Mei He, Lei Lei Qiao, Li Hong Lan, An Ping Liao, Yi Chun Wei, Lie Zhou
Magnetic composite microspheres of Cassava starch: Preparation and characterization
Ping Lan a, Yuxian Fengb, Rimei Hec, Leilei Qiaod, Lihong Lane,
Anping Liaof, *, Yichun Weig and Lie Zhouh
School of Chemistry and Chemical, Guangxi University for Nationalities, Key Laboratory of Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, Nanning, China
alanping1969@aliyun.com, b502640171@qq.com, c714030441@qq.com, d 383414891@qq.com, elanlihong2004@163.com,fgxanping@sina.com, g123421479@qq.com, h709358476@qq.com
Keywords: Cassava starch; magnetic microsphere; magnetization oxidation
Abstract: The magnetic composite microspheres of cassava starch have been prepared by magnetization of one-step oxidation, using cassava starch as natural macromolecule material.
Magnetic microspheres can be roughly categorized by structure property into the core-shell, shell-core and shell-core-shell, etc.
As for the magnetic microspheres with shell-core structures, core is magnetic material which makes the microspheres possessing enrichment and separation function; Shell is synthetic polymer or natural polymer which surface can be modified by other functional groups through physical and, chemical methods.
Comparing (a) to (b), the diffraction characteristic peak of (b) is in accordance with the diffraction characteristics peak of Fe3O4, which indicates the crystal structure of cassava starch does not change after modification by magnetic materials.
(3) Scanning electron microscopy (SEM) shows that the prepared product surface is rough, and the cluster phenomenon occurs in some degrees; prepared product is shell-cell structure in which cassava starch is cell and magnetic ferroferric oxide is the shell.
Magnetic microspheres can be roughly categorized by structure property into the core-shell, shell-core and shell-core-shell, etc.
As for the magnetic microspheres with shell-core structures, core is magnetic material which makes the microspheres possessing enrichment and separation function; Shell is synthetic polymer or natural polymer which surface can be modified by other functional groups through physical and, chemical methods.
Comparing (a) to (b), the diffraction characteristic peak of (b) is in accordance with the diffraction characteristics peak of Fe3O4, which indicates the crystal structure of cassava starch does not change after modification by magnetic materials.
(3) Scanning electron microscopy (SEM) shows that the prepared product surface is rough, and the cluster phenomenon occurs in some degrees; prepared product is shell-cell structure in which cassava starch is cell and magnetic ferroferric oxide is the shell.