Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: February 2022
Authors: Elizaveta V. Cherkasova, Tatyana G. Cherkasova
Examples of crystal structures are shown in Fig. 1, 2.
[Nd(C2H6SO)8]L crystal structure Fig.2.
Crystal structure refinement with SHELXL, Acta Crystallogr. 71 (2015) 3-8
Organic Chemistry, Oksford, 2012
Etkins, Inorganic chemistry, Moscow, Mir, 2004.
[Nd(C2H6SO)8]L crystal structure Fig.2.
Crystal structure refinement with SHELXL, Acta Crystallogr. 71 (2015) 3-8
Organic Chemistry, Oksford, 2012
Etkins, Inorganic chemistry, Moscow, Mir, 2004.
Online since: February 2012
Authors: P. Nyamukamba, Lilian Tichagwa, C. Greyling
The dopant level incorporated into the TiO2 lattice structure was varied by using different concentrations of the carbon source solution.
This shows the presence of hydroxyl group in the structure of the sample.
Yang, Effect of Fe-doping on the pore structure of meso-porous titania, Materials Science and Engineering B 134 (2006) 76-79
Sanchez, Sol-gel chemistry of transition metal oxides, Progress in Solid State Chemistry 18, (1988) 259–341
Jandt, Characterization of Ultraflat Titanium Oxide Surfaces, Chemistry of Materials 14 (2002) 777-789
This shows the presence of hydroxyl group in the structure of the sample.
Yang, Effect of Fe-doping on the pore structure of meso-porous titania, Materials Science and Engineering B 134 (2006) 76-79
Sanchez, Sol-gel chemistry of transition metal oxides, Progress in Solid State Chemistry 18, (1988) 259–341
Jandt, Characterization of Ultraflat Titanium Oxide Surfaces, Chemistry of Materials 14 (2002) 777-789
Online since: July 2019
Authors: Kuo Yuan Hwa, Palpandi Karuppaiah
Comparative Studies on the Synthesis of Copper Oxide Nano-Structures
Kuo Yuan Hwa1,2,a, Palpandi karuppaia1,b
1Department of Molecular Science & Organic Polymeric Materials Engineering,
2Center for Biomedical Industry, National Taipei University of Technology, Taipei, Taiwan 106, Republic of China
aemail: kyhwa@ntut.edu.tw, bemail: batisbala@gmail.com
Keywords: Copper Oxide, Green Chemistry, Scale-up production, Nanotechnology
Abstract.
Our simple and environmentally friendly synthesis procedures can produce various Cu (II) oxide nano-structures.
The experimental results also found similar to the reported diffraction patterns of CuO structures.
Zhang, Liu J., Peng Q., Wang X., Li Y., 2006, Chemistry of Materials. 18, 867-871
S., 2009, Materials Chemistry and Physics. 114, 6-9
Our simple and environmentally friendly synthesis procedures can produce various Cu (II) oxide nano-structures.
The experimental results also found similar to the reported diffraction patterns of CuO structures.
Zhang, Liu J., Peng Q., Wang X., Li Y., 2006, Chemistry of Materials. 18, 867-871
S., 2009, Materials Chemistry and Physics. 114, 6-9
Online since: August 2009
Authors: Yi Tai Qian, Pei Pei Xiao, Fei Xue, Ting Ting Wang
Diethylenetriamine-Assisted hydrothermal Route to Synthesize
Cuboidal Structure of PbSe Crystal
Peipei Xiao1,a , Fei Xue
1,b
, Tingting Wang1,c
, and Yitai Qian1,2,d*
1
Department of Chemistry, Hefei National Laboratory for Physical Sciences at Microscale and
Department of Materials Science & Engineering University of Science and Technology of China,
Hefei, Anhui, 230026 (China)
2
Key Laboratory of Colloid and Interface Chemistry, Shandong University, ministry of Education,
Jinan, 250100(China)
a
email: xiaopp@mail.ustc.edu.cn, b email: xfzls@mail.ustc.edu.cn, c email: ttw@mail.ustc.edu.cn ,
d *email: ytqian@ustc.edu.cn
Keywords: PbSe, Diethylenetriamine, Cuboidal structures, Hydrothermal
Abstract.
The shape evolution of PbSe crystal from eight-dendritic structure to cuboidal structure was observed and the possible growth mechanism was proposed.
As the reaction temperature was set in 130 °C, the multi-dendritic structures were obtained (Fig. 3a).
At 160 °C, dendritic structures were also obtained (Fig. 3b).
At 170 °C, the cuboidal structures and dendritic structures coexisted, and the yield of cuboidal crystals was not high (Fig. 3c).
The shape evolution of PbSe crystal from eight-dendritic structure to cuboidal structure was observed and the possible growth mechanism was proposed.
As the reaction temperature was set in 130 °C, the multi-dendritic structures were obtained (Fig. 3a).
At 160 °C, dendritic structures were also obtained (Fig. 3b).
At 170 °C, the cuboidal structures and dendritic structures coexisted, and the yield of cuboidal crystals was not high (Fig. 3c).
Online since: March 2014
Authors: Nikita S. Saenko, Albert M. Ziatdinov
Multi-walled carbon nanotubes synthesized by methane pyrolysis: structure and magnetic properties
Nikita S.
Ziatdinov1,b. 1 Institute of Chemistry of FEB RAS, 159, Prospekt 100-letiya, Vladivostok, 690022, Russia a e-mail: saenko@ich.dvo.ru, b e-mail: ziatdinov@ich.dvo.ru Keywords: carbon nanotubes, electronic structure, magnetic properties, electron microscopy, magnetic susceptibility, X-ray photoelectron spectroscopy, EMR.
The electron magnetic resonance (EMR) and X-ray photoelectron spectroscopy (XPS) measurements were performed in the Institute of Chemistry of FEB RAS (Vladivostok, Russia).
The electronic structure near the Fermi level for MWCNT powder differs from that for ordered graphite.
Zhou, Electronic structure of carbon nanotubes studied by photoelectron spectromicroscopy, Phys.
Ziatdinov1,b. 1 Institute of Chemistry of FEB RAS, 159, Prospekt 100-letiya, Vladivostok, 690022, Russia a e-mail: saenko@ich.dvo.ru, b e-mail: ziatdinov@ich.dvo.ru Keywords: carbon nanotubes, electronic structure, magnetic properties, electron microscopy, magnetic susceptibility, X-ray photoelectron spectroscopy, EMR.
The electron magnetic resonance (EMR) and X-ray photoelectron spectroscopy (XPS) measurements were performed in the Institute of Chemistry of FEB RAS (Vladivostok, Russia).
The electronic structure near the Fermi level for MWCNT powder differs from that for ordered graphite.
Zhou, Electronic structure of carbon nanotubes studied by photoelectron spectromicroscopy, Phys.
Online since: May 2013
Authors: Yang Yang, Yang Li
To do so we will use a self-sealing structure instead of a one-time hose sealing structure (as shown in Fig. 3.1-1).
Fig.3.1-1 Self-sealing structure Fig.3.1-2 Sealing clip Analysis of man-machine dimension of plastic hose packaging structure.
How can we further improve packaging structure?
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Fig.3.1-1 Self-sealing structure Fig.3.1-2 Sealing clip Analysis of man-machine dimension of plastic hose packaging structure.
How can we further improve packaging structure?
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Online since: April 2005
Authors: Marcel Lux, Guy Vereecke, Sophia Arnauts, Karine Kenis, P. Jaenen, M. Lismont, S. Beckx, Frank Holsteyns, James Snow, Rita Vos, Paul W. Mertens
In this paper the capability of megasonic cleaning to remove nanoparticles without inflicting
damage to fragile structures is investigated.
When gas is dissolved in the cleaning solution present tools can remove nanoparticles down to about 30 nm using dilute chemistries at low temperature.
This apparent increase in line strength may reveal two important aspects of the damage problem: (1) the level of damage depends on the processing of structures and part of the solution to damage problems in production may actually lie with process engineers, (2) damage seems to happen at weak spots in the structures.
Group II corresponds to cleans performed at high power in aerated solutions under different process conditions (chemistry, concentration, temperature).
Energy / strength Frequency Megasonic damage STRUCTURE Energy / strength Frequency Megasonic damage STRUCTURE CAVITATION CAVITATION Figure 11: Schematic representation of the frequency distribution of cavitation energy and structure strength.
When gas is dissolved in the cleaning solution present tools can remove nanoparticles down to about 30 nm using dilute chemistries at low temperature.
This apparent increase in line strength may reveal two important aspects of the damage problem: (1) the level of damage depends on the processing of structures and part of the solution to damage problems in production may actually lie with process engineers, (2) damage seems to happen at weak spots in the structures.
Group II corresponds to cleans performed at high power in aerated solutions under different process conditions (chemistry, concentration, temperature).
Energy / strength Frequency Megasonic damage STRUCTURE Energy / strength Frequency Megasonic damage STRUCTURE CAVITATION CAVITATION Figure 11: Schematic representation of the frequency distribution of cavitation energy and structure strength.
Online since: November 2011
Authors: Hui Xiang Xu, Yang Li, Xiao Bing Shi, Wei Qiang Pang
Characteristics of NEPE Propellant with Ammonium Dinitramide (ADN)
Pang Wei-qiang 1,a, Xu Hui-xiang 1,b, Li Yang 1,c, Shi Xiao-bing 1,d
1 Xi’an Modern chemistry Research Institute, xi’an710065,China
a nwpu_pwq@163.com b xhx204@yahoo.com.cn c nwpu_pwq@126.com d cumt_pwq@163.com
Keywords: material chemistry; NEPE propellant; ADN; burning characteristics; thermal decomposition
Abstract: The theoretical performances of NEPE (nitrate ester plasticized polyether) propellant with and without ADN were calculated with minimum free energy method.
The materials mentioned above were purchased from Xi’an Modern Chemistry Research Institute and Liming Research Institute of Chemical Industry in China.
Impact instrument made in Xi’an Modern Chemistry Research Institute was used to test the impact sensitivity of propellant with and without ADN samples.
Friction instrument (90 0, 3.92 MPa) also made in Xi’an Modern Chemistry Research Institute was employed to test the friction sensitivity of samples.
Surface microstructures of NEPE propellant with ADN SEM observation of the propellants surface is one of the most important means to study the physical structures of ADN oxidizer in NEPE propellant.
The materials mentioned above were purchased from Xi’an Modern Chemistry Research Institute and Liming Research Institute of Chemical Industry in China.
Impact instrument made in Xi’an Modern Chemistry Research Institute was used to test the impact sensitivity of propellant with and without ADN samples.
Friction instrument (90 0, 3.92 MPa) also made in Xi’an Modern Chemistry Research Institute was employed to test the friction sensitivity of samples.
Surface microstructures of NEPE propellant with ADN SEM observation of the propellants surface is one of the most important means to study the physical structures of ADN oxidizer in NEPE propellant.
Online since: May 2011
Authors: Wei Shen, Bao Jian Shen
The results show that the synthesized sample not only has a composite structure with zeolite Y and silica gel, but also retains the shape of silica gel microsphere.
The synthesized sample not only has a composite structure with zeolite Y and silica gel, but also retains the shape of silica gel microsphere.
Corma, in: Catalytic cracking: catalysis, chemistry, and kinetics, Marcel Dekker, New York, 1986, p. 73
Barrer, Hydrochemical Chemistry of Zeolites, voles 3–4, Academic Press, London, 1982, Ch. 2.; R.
Chen, Chemistry–Zeolites and Porous Materials, Science Press, Beijing, 2004
The synthesized sample not only has a composite structure with zeolite Y and silica gel, but also retains the shape of silica gel microsphere.
Corma, in: Catalytic cracking: catalysis, chemistry, and kinetics, Marcel Dekker, New York, 1986, p. 73
Barrer, Hydrochemical Chemistry of Zeolites, voles 3–4, Academic Press, London, 1982, Ch. 2.; R.
Chen, Chemistry–Zeolites and Porous Materials, Science Press, Beijing, 2004
Online since: August 2017
Authors: Yi Yang, Miao Chen, Mikko Vepsalainen
Characterization and Localized Insight into Leaching of Sulfide Minerals
Miao Chen*1,2, Yi Yang1, Mikko Vepsalainen1
1CSIRO Mineral Resources, Clayton, Vic 3169, Australia
2Centre for Advanced Materials and Industrial Chemistry, School of Applied Sciences,
RMIT University, Melbourne, Vic 3001, Australia
Keywords: Sulfide minerals, leaching, In Situ XAS, SECM, real-time sensing
Abstract.
To improve the efficiency of sustainable recovery of valuable resources (such as copper, gold, uranium), advanced technologies of electrochemistry, surface chemistry and materials characterization, including synchrotron X ray-absorption spectroscopy (XAS), X-Ray photoelectron spectroscopy (XPS), and in situ X-ray diffraction (XRD) have been employed to investigate the interactions between microbes and sulfide minerals in situ to gain a detailed understanding of the chemical reaction mechanisms operating in bioleaching.
There are still significant fundamental gaps in understanding of arsenic chemistry under industrial conditions like pressure oxidation and bio-oxidation, especially arsenic transformation between oxidation states (some of which are toxic and some not), the effect of complex mineralogy and processing conditions on arsenic chemistry, and solution speciation.
To understand the leaching mechanism, both bulk analysis and surface chemistry are important.
We have applied synchrotron X-ray absorption near-edge structure (XANES) to understand the bioleaching mechanism of chalcopyrite, pyrite, and arsenopyrite by mixed mesophile culture mesophiles (30oC) and mixed moderate thermophiles (48oC) [1-3].
To improve the efficiency of sustainable recovery of valuable resources (such as copper, gold, uranium), advanced technologies of electrochemistry, surface chemistry and materials characterization, including synchrotron X ray-absorption spectroscopy (XAS), X-Ray photoelectron spectroscopy (XPS), and in situ X-ray diffraction (XRD) have been employed to investigate the interactions between microbes and sulfide minerals in situ to gain a detailed understanding of the chemical reaction mechanisms operating in bioleaching.
There are still significant fundamental gaps in understanding of arsenic chemistry under industrial conditions like pressure oxidation and bio-oxidation, especially arsenic transformation between oxidation states (some of which are toxic and some not), the effect of complex mineralogy and processing conditions on arsenic chemistry, and solution speciation.
To understand the leaching mechanism, both bulk analysis and surface chemistry are important.
We have applied synchrotron X-ray absorption near-edge structure (XANES) to understand the bioleaching mechanism of chalcopyrite, pyrite, and arsenopyrite by mixed mesophile culture mesophiles (30oC) and mixed moderate thermophiles (48oC) [1-3].