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Online since: November 2008
Authors: Radosław Zaleski, Jacek Goworek
Marii Curie-Sklodowskiej 1, 20-031
Lublin, Poland
2
Faculty of Chemistry, Maria Curie-Sklodowska University, pl.
Materials and experimental A quasi one-dimensional structure of n-nonadecane (C19H40) was created by putting the alkane in the cylindrical pores of ordered mesoporous MCM-41 silica.
This confirms that, in regular pores of MCM-41, the lamellar structure of n-nonadecane is preserved at least partially, contrary to the results obtained for n-nonadecane confined in the irregular pores of Vycor glass [6].
The long-lived o-Ps component (τo-Ps (2) = 1.8 ns) observed in the rigid phase is related to the silica structure.
Materials and experimental A quasi one-dimensional structure of n-nonadecane (C19H40) was created by putting the alkane in the cylindrical pores of ordered mesoporous MCM-41 silica.
This confirms that, in regular pores of MCM-41, the lamellar structure of n-nonadecane is preserved at least partially, contrary to the results obtained for n-nonadecane confined in the irregular pores of Vycor glass [6].
The long-lived o-Ps component (τo-Ps (2) = 1.8 ns) observed in the rigid phase is related to the silica structure.
Online since: December 2006
Authors: Kazuo Arakawa, Tetsuo Takayama, Mitsugu Todo
Ltd) and PCL (CelgreenH7
® Daicel Chemistry Industries Co.) pellets and LTI (Kyowa Co.
On the contrary, elongated structures are observed for both C10 and C20.
phase is well dispersed in PLA due to LTI addition, and the entangled structure of PLA/PCL/LTI blends causes such ductile deformation.
PCL spherulites dispersed in the blends become small as PCL content increases, resulting in the increase of the entangled structure of PLA and PCL.
On the contrary, elongated structures are observed for both C10 and C20.
phase is well dispersed in PLA due to LTI addition, and the entangled structure of PLA/PCL/LTI blends causes such ductile deformation.
PCL spherulites dispersed in the blends become small as PCL content increases, resulting in the increase of the entangled structure of PLA and PCL.
Online since: September 2008
Authors: Morihiro Saito, Yasukazu Saito, Jun Kuwano, Kiyoshi Aramaki, Susumu Kawaguchi
Preparation of Ru Nano-particles Dispersed on a Highly-porous Material
Kiyoshi Aramaki, Susumu Kawaguchi, Morihiro Saito, Jun Kuwano, Yasukazu Saito
Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science,
12-1 Ichigayafunagawara-machi, Shinjuku-ku, Tokyo 162-0826, JAPAN
Keywords: Ru3(CO)12 precursor, Boiling impregnation method, Carbon-supported Ru catalyst, Ru nano-particle
ABSTRACT
Metallic ruthenium nano-particles supported on carbon were prepared from Ru3(CO)12 and
highly-porous activated carbon by adsorption of the complex under boiling conditions in an acetone
or cyclohexane solution, followed by H2 reduction at 200o C.
a) Conventional method 20 nm b-1 ) Before H2 reduction b) Novel boiling impregnation method b-2 ) 20 nm After H2 reduction 100 nm a ) After NaBH4 reduction With regard to our novel preparation method, it was pointed out that any kind of metal-cluster structures[6] would be retained before the reduction treatment and that H2 flow at 200o C was sufficient enough for the complex to change into metallic particles (3.01 nm in average), the sizes of which were larger than those of carbon micropores (2.15 nm).
In contrast, the original pore sizes were kept unchanged (2.12 ~ 2.14 nm), suggesting that the micropore structures of carbon were held intact substantially during the procedures of occupation (b-1) and restoration (b-2).
Similar immobilization of Ru3(CO)12 was attempted onto Al2O3, for which the ligand elimination at half and the formation of the twin-carbonyl structure of [Ru(CO)2]n were reported [6].
a) Conventional method 20 nm b-1 ) Before H2 reduction b) Novel boiling impregnation method b-2 ) 20 nm After H2 reduction 100 nm a ) After NaBH4 reduction With regard to our novel preparation method, it was pointed out that any kind of metal-cluster structures[6] would be retained before the reduction treatment and that H2 flow at 200o C was sufficient enough for the complex to change into metallic particles (3.01 nm in average), the sizes of which were larger than those of carbon micropores (2.15 nm).
In contrast, the original pore sizes were kept unchanged (2.12 ~ 2.14 nm), suggesting that the micropore structures of carbon were held intact substantially during the procedures of occupation (b-1) and restoration (b-2).
Similar immobilization of Ru3(CO)12 was attempted onto Al2O3, for which the ligand elimination at half and the formation of the twin-carbonyl structure of [Ru(CO)2]n were reported [6].
Online since: June 2012
Authors: Jun Zhu, Ji Ke Guo, Jing Jing Xue, Xin Li
To be specified, Fe2O3 is usually formed under high temperatures and high pressure conditions, whose structure is stable, and its dissolution is very difficult.
Maybe the phosphoric acids act as the complexation agents both on vanadium ions and iron ions, which would destroy the molecular structure of minerals.
However, when only phosphoric acid was used to leach, the vanadium leaching rate is 8.3 wt.%, because the phosphoric acid is medium strong acid, although it can damage the vanadium ore structure, the H+ concentration can not meet the environmental requirements of acid leaching [11, 12].
Gong: Analytical Chemistry (third edition), Dalian, 2004
Maybe the phosphoric acids act as the complexation agents both on vanadium ions and iron ions, which would destroy the molecular structure of minerals.
However, when only phosphoric acid was used to leach, the vanadium leaching rate is 8.3 wt.%, because the phosphoric acid is medium strong acid, although it can damage the vanadium ore structure, the H+ concentration can not meet the environmental requirements of acid leaching [11, 12].
Gong: Analytical Chemistry (third edition), Dalian, 2004
Synthesis and Characterization of Silver-Histidine Complex Doped Montmorillonite Antibacterial Agent
Online since: April 2012
Authors: Shu’e Duan, Yun Hui Zhai, Ying Juan Qu
Synthesis and Characterization of silver-histidine complex doped montmorillonite antibacterial agent
Shu’e Duana,Yunhui Zhaib, Yingjuan Quc
Department of Chemistry and Chemical Engineering, Xi’an University of Arts and Science, Xi’an 710065, P.R.
The structures of the SHMMT powder was characterized by a powder X-ray diffractometer (XRD)( RAD-C, Rigaku-Denki Co., Tokyo, Japan) using Ni filtered Cu-Kα radiation. 40 kV and 24 mA of voltage and current setting were used.
The XRD results showed that SHMMT had a layered structure similar to Na-MMT as well as Ag-MMT.
[Ag (his)]+ was intercalated in the interlayer structure.
The structures of the SHMMT powder was characterized by a powder X-ray diffractometer (XRD)( RAD-C, Rigaku-Denki Co., Tokyo, Japan) using Ni filtered Cu-Kα radiation. 40 kV and 24 mA of voltage and current setting were used.
The XRD results showed that SHMMT had a layered structure similar to Na-MMT as well as Ag-MMT.
[Ag (his)]+ was intercalated in the interlayer structure.
Online since: January 2005
Authors: M. Mujahid, S.H. Sim, J. Zhu
Mechanical alloying (MA) has been extensively applied to produce nanostructured bulk materials
with a broad range of chemical compositions and crystal structures [6].
The objective of the present work is to prepare Fe-Co-Ni nanocrystalline alloys by MA and to study the influence of processing on the structure and magnetic properties.
Therefore, it is believed that Co atoms gradually diffuse into Fe lattice and form Fe-based solid solution with A2-type bcc crystal structure.
Pabi: Materials Chemistry and Physics, 68 (2001), 85-94
The objective of the present work is to prepare Fe-Co-Ni nanocrystalline alloys by MA and to study the influence of processing on the structure and magnetic properties.
Therefore, it is believed that Co atoms gradually diffuse into Fe lattice and form Fe-based solid solution with A2-type bcc crystal structure.
Pabi: Materials Chemistry and Physics, 68 (2001), 85-94
Online since: April 2014
Authors: Raihan Mahirah Ramli, Abdul Aziz Omar, Chong Fai Kait
The morphological structure of the photocatalysts were examined using a field emission scanning electron microscope (FESEM, Supra55VP).
Fig. 3: FESEM micrographs of the photocatalysts Meanwhile, the FESEM micrograph in Fig. 3 shows the morphological structure of the photocatalyst.
Journal of Photochemistry and Photobiology A: Chemistry. 238 (2012) 63-70
Hydrogen production from methanol/water decomposition in a liquid photosystem using the anatase structure of Cu loaded TiO2.
Fig. 3: FESEM micrographs of the photocatalysts Meanwhile, the FESEM micrograph in Fig. 3 shows the morphological structure of the photocatalyst.
Journal of Photochemistry and Photobiology A: Chemistry. 238 (2012) 63-70
Hydrogen production from methanol/water decomposition in a liquid photosystem using the anatase structure of Cu loaded TiO2.
Online since: February 2011
Authors: Man Li, Dan Peng, Yi Ming Sun
A Study of Ramie Fiber Reinforced Polypropylene Composites
Yiming Suna, Dan Pengb and Man Lic
College of Chemistry and Environmental Engineering,Hubei University of Technology, Wuhan, China
a y98m@163.com, bpd8312008@yahoo.com.cn, c riemann1989@gmail.com
Keywords: Ramie Fiber; Polypropylene; Composite Material
Abstract: Ramie fibers were incorporated into polypropylene as the reinforcement fillers.
The spectra suggest that the surface structure of cellulose changed after the modification.
The MAPP has a long carbon chain structure in the other end.
This long-chain structure had good compatibility with the PP, which can increase the performance of ramie fiber on PP.
The spectra suggest that the surface structure of cellulose changed after the modification.
The MAPP has a long carbon chain structure in the other end.
This long-chain structure had good compatibility with the PP, which can increase the performance of ramie fiber on PP.
Online since: September 2013
Authors: Guang Chun Yao, Hua Shen, He Liang, Wei Dong Yang, Chuan Sheng Wang
Effect of Y on Microstructure and Mechanical
Properties of Aluminium Alloy
Hua Shen1,a , He Liang2,b, Weidong Yang2,c, Guangchun Yao1,d ,
Chuansheng Wang2,e
1School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
2Institute of Applying Chemistry, Shenyang University of Chemical and Technology, Shenyang 100142, China
ayywwddsshh@sina.com, blianghe@syict.edu.cn, cyangweidong@syict.edu.cn,
dyaoguangchun@neu.edu.cn,ewangchuansheng@syict.edu.cn
Keywords: Yttrium(Y); Mechanical properties; Microstructure
Abstract.
These additions can modify the dispersion and/or the habit plane, morphology and crystal structure of the resulting precipitation.[4]Rare earth elements in conventional casting aluminum alloys have shown beneficial effects on melting and solidification.
Similar Al-Y system reports in the literature are also observed.[12-15] Studies have shown that Al2Y is non-coherent with Al, cubic structure.
Al2Y is easy to precipitate in alloy solidification and forms the nuclear particles, thus refined structure.
These additions can modify the dispersion and/or the habit plane, morphology and crystal structure of the resulting precipitation.[4]Rare earth elements in conventional casting aluminum alloys have shown beneficial effects on melting and solidification.
Similar Al-Y system reports in the literature are also observed.[12-15] Studies have shown that Al2Y is non-coherent with Al, cubic structure.
Al2Y is easy to precipitate in alloy solidification and forms the nuclear particles, thus refined structure.
Online since: February 2016
Authors: Markéta Rovnaníková, Martin Vyšvařil
Study of Fine-grained Composites Exposed to Sulfuric Acid and Sodium Sulfate
VYŠVAŘIL Martin1, a * and ROVNANÍKOVÁ Markéta1, b
1 Brno University of Technology, Faculty of Civil Engineering, Institute of Chemistry, Žižkova 17, 602 00 Brno, Czech Republic
avysvaril.m@fce.vutbr.cz, bchroma.m@fce.vutbr.cz
Keywords: Sulfate Attack, Concrete, pH, Sulfates, Sulfuric Acid, Sewer System
Abstract.
Introduction Concrete is a most common material that is used in sewer collection systems and there exists a corrosion problem involving the destruction of concrete pipes or structures by sulfuric acid produced by sulfur-oxidizing bacteria from hydrogen sulfide.
However, the greatest danger impends in the gradual depletion of the samples through an aggressive reaction of H2SO4 with a cement matrix and after a long time, it can lead to an exposure of a reinforcement in concrete structures and its subsequent corrosion.
LO1408 „AdMaS UP – Advanced Materials, Structures and Technologies“.
Introduction Concrete is a most common material that is used in sewer collection systems and there exists a corrosion problem involving the destruction of concrete pipes or structures by sulfuric acid produced by sulfur-oxidizing bacteria from hydrogen sulfide.
However, the greatest danger impends in the gradual depletion of the samples through an aggressive reaction of H2SO4 with a cement matrix and after a long time, it can lead to an exposure of a reinforcement in concrete structures and its subsequent corrosion.
LO1408 „AdMaS UP – Advanced Materials, Structures and Technologies“.