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Online since: June 2012
Authors: Qing Rong Feng, Yin Bo Wang, Yi Ling Chen
These nano-granules can balance both the inner structure and the surface activity of the MgB2 crystal.
In this paper, we will study the nano-structure properties of MgB2 thin films to understand their strong adhesion effects to the SS substrate.
As a result, these MgB2 thin films have both integrated structure and great surface activity.
From the knowledge of structure chemistry[25], if the second phase materials (it is MgB2 film in our experiment) that is hard and brittle distribute over the crystal boundary of the softer first phase materials (it is SS substrate in our experiment) with a grain homogeneous distribution, then the second phase materials will exhibit better tenacity and ductility.
[25] Qi-xun Dai, Xiao-nong Chen, Metal Materials Chemistry Industry Press, (2005) 275-277 (Chinese).
In this paper, we will study the nano-structure properties of MgB2 thin films to understand their strong adhesion effects to the SS substrate.
As a result, these MgB2 thin films have both integrated structure and great surface activity.
From the knowledge of structure chemistry[25], if the second phase materials (it is MgB2 film in our experiment) that is hard and brittle distribute over the crystal boundary of the softer first phase materials (it is SS substrate in our experiment) with a grain homogeneous distribution, then the second phase materials will exhibit better tenacity and ductility.
[25] Qi-xun Dai, Xiao-nong Chen, Metal Materials Chemistry Industry Press, (2005) 275-277 (Chinese).
Online since: February 2017
Authors: Kittimon Jirakittidul, Krittaya Khrongsakun, Kannika Khongkhaw, Kusuman Nernplod
Introductions
Polyurethanes (PU) are a class of block copolymer containing the urethane linkage within their molecular structures.
One of the great advantages of PU is its ability to making its properties tailored via chemistry [1], which allows these properties to be adjusted to match numerous applications.
This structure was also found on the research of Sumita et al. [9].
Frisch, Polyurethanes Chemistry and Technology Part II Technology, Interscience Publishers, New York, 1964
Galiotis, Carbon nanotube-polymer composites: chemistry, processing, mechanical and electrical properties, Prog.
One of the great advantages of PU is its ability to making its properties tailored via chemistry [1], which allows these properties to be adjusted to match numerous applications.
This structure was also found on the research of Sumita et al. [9].
Frisch, Polyurethanes Chemistry and Technology Part II Technology, Interscience Publishers, New York, 1964
Galiotis, Carbon nanotube-polymer composites: chemistry, processing, mechanical and electrical properties, Prog.
Online since: August 2009
Authors: Sheng Kang Liang, Dan Dan Song
Characteristics of a Extracellular Bioflocculant
From a Serratia plumuthica Isolate
Sheng-kang Liang
1, 2, a, *
Dan-dan Song 1, 2, b
1
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean
University of China, 266003, China;
2
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266003,
China
a
liangsk@ouc.edu.cn; bdandansong2008@163.com
Correspondence: Shengkang Liang, College of Chemistry and Chemical Engineering, Ocean
University of China, Qingdao, 266003, China.
The freeze-dried purified bioflocculant was whitish, and had a porous structure.
The precipitation occurring after the addition of CPC to the bioflocculant solution indicated that it contained acidic groups in its structure due to the interaction with the quarternary ammonium ion of the CPC, resulting in the formation of a polysaccharide-CPC complex [9].
The freeze-dried purified bioflocculant was whitish, and had a porous structure.
The precipitation occurring after the addition of CPC to the bioflocculant solution indicated that it contained acidic groups in its structure due to the interaction with the quarternary ammonium ion of the CPC, resulting in the formation of a polysaccharide-CPC complex [9].
Online since: April 2009
Authors: Celia Silvestre, M.J. López-Tendero, Manuel Cruz-Yusta, Noelia Baeza, Celia Guillem, Stephanie San Juan, J. Manolo Lloris, Eduardo Tamayo
Due to that, most common methods are based on the use of sol-gel technology [9] combined with
organic polymer chemistry, due to the fact that the so-called sol-gel process enables the synthesis of
ceramic materials at temperatures as low as room temperature.
The first hybrids based on organic polymer chemistry reported in literature were synthesized using polydimethylsiloxane (PDMS) and TEOS as a silica precursor [10].
This work presents the first results of a project that aims to understand the relationship between the structure and the syntheses parameters, processing, and mechanical properties of hybrid materials used in the development of coatings that could be applied on construction products in order to increase their tribological properties.
Sol-Gel Science: the physics and chemistry of sol-gel processing.
The synthesis, structure and property behaviour of inorganic-organic hybrid network materials prepared by sol-gel process.
The first hybrids based on organic polymer chemistry reported in literature were synthesized using polydimethylsiloxane (PDMS) and TEOS as a silica precursor [10].
This work presents the first results of a project that aims to understand the relationship between the structure and the syntheses parameters, processing, and mechanical properties of hybrid materials used in the development of coatings that could be applied on construction products in order to increase their tribological properties.
Sol-Gel Science: the physics and chemistry of sol-gel processing.
The synthesis, structure and property behaviour of inorganic-organic hybrid network materials prepared by sol-gel process.
Online since: June 2012
Authors: Guo Hua Li, Su Juan Hu, Dan Chen
Preparation and Photocatalytic Activity of TiO2/FeOOH Nanocomposite
Dan CHEN 1, a, Sujuan HU 1,b, Guohua LI 2,c
12 The School of Chemical Engineering and Materials Science, Hangzhou 310032 China
2 The State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Hangzhou 310032 China
achendan06120011@163.com, b827509717@qq.com, cnanozjut@zjut.edu.cn
Keywords: Titania, Goethite, Nanocomposite, Preparation,Photocatalytic activity
Abstract.
TEM.Fig.3 displays images of the morphology and structure of the support and the samples prepared with different parameters.
The absorption ability and photocatalytic activity of TiO2/FeOOH nano-photocatalyst are improved by its composite structure.
Beata, M.Sylwia, M.AntoniW, G.Barbara , J.Magdalena and K.Kazimierz: Solar Energy Mater Solar Cells Vol. 88 ( 2005),p.269 [4] S.Kohtani, M.Tomohiro, K.Tokumura and R.Nakagaki : Applied Catalysis B: Environment Vol. 58 (2005),p.265 [5] V.Nadtochenko, N.Denisov, O.Sarjusiv , D.Gumy, C.Pulgarin and J.Kiwi: Journal of Photochemistry and Photobiology A: Chemistry Vol. 181 (2006),p.401 [6] Yang Liu, Xiaolei Wang, Fan Yang and Xiurong Yang: Micropor Mesopor Mater Vol. 114 (2008),p.431 [7] O.
Akhavan: Journal of Colloid and Interface Science Vol. 336 (2009),p.117 [8] M.I.Litter and J.A.Navío: Journal of Photochemistry and Photobiology A: Chemistry Vol. 98 ( 1996),p.171
TEM.Fig.3 displays images of the morphology and structure of the support and the samples prepared with different parameters.
The absorption ability and photocatalytic activity of TiO2/FeOOH nano-photocatalyst are improved by its composite structure.
Beata, M.Sylwia, M.AntoniW, G.Barbara , J.Magdalena and K.Kazimierz: Solar Energy Mater Solar Cells Vol. 88 ( 2005),p.269 [4] S.Kohtani, M.Tomohiro, K.Tokumura and R.Nakagaki : Applied Catalysis B: Environment Vol. 58 (2005),p.265 [5] V.Nadtochenko, N.Denisov, O.Sarjusiv , D.Gumy, C.Pulgarin and J.Kiwi: Journal of Photochemistry and Photobiology A: Chemistry Vol. 181 (2006),p.401 [6] Yang Liu, Xiaolei Wang, Fan Yang and Xiurong Yang: Micropor Mesopor Mater Vol. 114 (2008),p.431 [7] O.
Akhavan: Journal of Colloid and Interface Science Vol. 336 (2009),p.117 [8] M.I.Litter and J.A.Navío: Journal of Photochemistry and Photobiology A: Chemistry Vol. 98 ( 1996),p.171
Online since: August 2020
Authors: Atiek Rostika Noviyanti, Iman Rahayu, Soni Setiadji, Risdiana Risdiana, Fitrilawati Fitrilawati, Norman Syakir, Eko Sumiyanto
Synthesis of Polydimethylsiloxane and its Monomer from Hydrolysis of Dichlorodimethylsilane
Soni Setiadji1,3,a, Eko Sumiyanto3,b, Fitrilawati2,c, Norman Syakir2,d,
Atiek Rostika Noviyanti4,e, Iman Rahayu4,f and Risdiana2,g*
1Doctoral Course Program, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl.
Raya Bandung-Sumedang km 21 Jatinangor, Sumedang, West Java, Indonesia 45363 3Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl.
Nasution No. 105 Cibiru, Bandung, West Java, Indonesia, 40614 4Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl.
IR spectra of PDMS sample show functional groups of PDMS structure without any impurity group.
Safriani, Risdiana, Characterization of optical and structure properties of polydimethylsiloxanes, Mater.
Raya Bandung-Sumedang km 21 Jatinangor, Sumedang, West Java, Indonesia 45363 3Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl.
Nasution No. 105 Cibiru, Bandung, West Java, Indonesia, 40614 4Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl.
IR spectra of PDMS sample show functional groups of PDMS structure without any impurity group.
Safriani, Risdiana, Characterization of optical and structure properties of polydimethylsiloxanes, Mater.
Online since: November 2023
Authors: Vagner Braga, Diego Tolotti de Almeida, André Luiz Vasconcellos da Costa e Silva, Ed Juarez Mendes Taiss
Steel Chemistry obtained on Lab Production- Wt.(%) [1][2]
Steel
C
Mn
Si
P
S
Cr
Ni
Mo
Ti
Nb
Al
BPPM
NPPM
Nb
0.22
1.16
0.18
0.008
0.004
0.22
<0.1
<0.1
0.03
0.047
<0.01
31
39
Nb+Mo
0.22
1.17
0.17
0.008
0.005
0.25
<0.1
0.16
0.03
0.047
0.014
21
57
During the lab phase a full characterization was performed in order to support the industrial production.
The main conclusions based on the results of the lab development stage were: the addition of Mo increased the hardenability significantly; specially in case of Nb-Mo steel, pancaked austenitic structure was achieved after hot rolling; after fast reaustenization and quenching, PAGS(Previous Austenitic Grain Size) was relatively small: 6.9-7.4 μm; smaller grain sizes were achieved by Nb-Mo steel; tensile strength values were > 1500 MPa and total elongation values ~11%, which could be considered high for these type of steel; toughness was also better for the Nb-Mo steel: Charpy V - Notch test results (34J/cm2) were reached at temperatures lower than -60 °C (5 mm specimen) [1] These results obtained mainly on Nb+Mo alloy design were the reason to decide to continue the development on industrial scale.
The chemistry on the industrial trial heat is showed on Table 3.
Steel Chemistry obtained on Industrial Trail - Wt.(%).
Tension Test and Fatigue evaluation on the laser welded coupons Conclusions and Perspectives The results obtained in laboratory, in cooperation with SSAB Europe, University of Oulu and NiobelCon, showed that the NbMo steel proposed represents a potential solution for a wider range of applications on commercial vehicles structures.
The main conclusions based on the results of the lab development stage were: the addition of Mo increased the hardenability significantly; specially in case of Nb-Mo steel, pancaked austenitic structure was achieved after hot rolling; after fast reaustenization and quenching, PAGS(Previous Austenitic Grain Size) was relatively small: 6.9-7.4 μm; smaller grain sizes were achieved by Nb-Mo steel; tensile strength values were > 1500 MPa and total elongation values ~11%, which could be considered high for these type of steel; toughness was also better for the Nb-Mo steel: Charpy V - Notch test results (34J/cm2) were reached at temperatures lower than -60 °C (5 mm specimen) [1] These results obtained mainly on Nb+Mo alloy design were the reason to decide to continue the development on industrial scale.
The chemistry on the industrial trial heat is showed on Table 3.
Steel Chemistry obtained on Industrial Trail - Wt.(%).
Tension Test and Fatigue evaluation on the laser welded coupons Conclusions and Perspectives The results obtained in laboratory, in cooperation with SSAB Europe, University of Oulu and NiobelCon, showed that the NbMo steel proposed represents a potential solution for a wider range of applications on commercial vehicles structures.
Online since: December 2006
Authors: Yu Qiao Wang, Chun Ping Liu, Kang Li, Yue Ming Sun
Fabrication and I-V Characteristics of Nanocrystalline Titania Electrode
Sensitized by Zinc Phthalocyanine
Yuqiao Wang
a, Chunping Liu
b, Kang Lib , Yueming Sunb
Department of Chemistry and Chemical Engineering, Southeast University, Nanjing, China
a
email:aqiao_025@163.com, b
email:sun@seu.edu.cn
Keywords: Sol-gel Method, Nanocrystalline Titania Electrode, Sensitization, Zinc Phthalocyanine
Abstract.
Results and Discussion Structures of the nanocrystalline TiO2 electrode.
The reason is that ZnTCPc has another more four carboxyl groups on the structure than ZnPc.
Grätzel: Journal of Photochemistry and Photobiology A: Chemistry Vol. 164 (2004) p.3 [7] J.G.
Grätzel: Journal of Photochemistry and Photobiology A: Chemistry Vol.164 (2004) p.3
Results and Discussion Structures of the nanocrystalline TiO2 electrode.
The reason is that ZnTCPc has another more four carboxyl groups on the structure than ZnPc.
Grätzel: Journal of Photochemistry and Photobiology A: Chemistry Vol. 164 (2004) p.3 [7] J.G.
Grätzel: Journal of Photochemistry and Photobiology A: Chemistry Vol.164 (2004) p.3
Online since: September 2013
Authors: Li Ping Gao, Xin Ping Wang, Wen Juan Li
Wang3,c
1 Applied Chemistry Department, Zhejiang Sci-Tech University, Hangzhou 310018, P.R.
China 2 Applied Chemistry Department, Zhejiang Sci-Tech University, Hangzhou 310018, P.R.
China 3 Applied Chemistry Department, Zhejiang Sci-Tech University, Hangzhou, 310018, P.R.
Experimental 1.1 Chemicals MelphalanHCl, D-enantiomer, imp-1 and imp-2 were kindly supplied by Zhejiang Chempacific,and the chemical structures were given in Fig.1.
Chemical Structures of MelphalanHCl and impurities 1.2 Equipment An Agilent 1200 HPLC system consisting of a standard degasser, pump, column oven, autosampler and DAD detector were used to conduct the analysis.
China 2 Applied Chemistry Department, Zhejiang Sci-Tech University, Hangzhou 310018, P.R.
China 3 Applied Chemistry Department, Zhejiang Sci-Tech University, Hangzhou, 310018, P.R.
Experimental 1.1 Chemicals MelphalanHCl, D-enantiomer, imp-1 and imp-2 were kindly supplied by Zhejiang Chempacific,and the chemical structures were given in Fig.1.
Chemical Structures of MelphalanHCl and impurities 1.2 Equipment An Agilent 1200 HPLC system consisting of a standard degasser, pump, column oven, autosampler and DAD detector were used to conduct the analysis.
Online since: March 2015
Authors: Wei Xin Shi, Qing Shi Wang, Chuan Liang Li, Ji Lin Wei, Fei Long Wu
Weltner et al[21] and Watts et al[22] described accurately the three electronic bound state structure of C-2.
In this paper, the electronic structure is calculated by the MRCI method of the MOLPRO program package.
Wayne: Chemistry of Atmospheres an Introduction to the Chemistry of the Atmospheres of Earth, the Planets, and Their Satellites(3rd edn) (Oxford University Press, Oxford 2002) [7].
Levine: Quantum Chemistry (sixth edition) ( World Book Inc, Beijing) (2011), p.471 [24].H.
In this paper, the electronic structure is calculated by the MRCI method of the MOLPRO program package.
Wayne: Chemistry of Atmospheres an Introduction to the Chemistry of the Atmospheres of Earth, the Planets, and Their Satellites(3rd edn) (Oxford University Press, Oxford 2002) [7].
Levine: Quantum Chemistry (sixth edition) ( World Book Inc, Beijing) (2011), p.471 [24].H.