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Online since: November 2011
Authors: Xiao Nan Dong, Xiao Feng Wang, Zhen Feng Zhu, Guang Jun Li, Hui Liu
China
2Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, P.
All of the reflections in the XRD patterns in Figure 1a and b were consistent with the pattern reported tetragonal rutile structure tin oxide, which matched well with the standard pattern (JCPDS No. 41-1445), and no characteristic peaks of impurities, such as elemental Sn or other tin oxides, were detected.
As shown in Figure 1c, the as-prepared SnO2 microspheres had dense structure without any cavities.
It is interesting that, although every small tin oxide crystallite (show as inset of Figure 2d) exhibits very obvious lattice fringes, the corresponding selected area electron diffraction (SAED) pattern (show as inset of Figure 2d) only presents a set of ring-like polycrystalline structure.
All of the reflections in the XRD patterns in Figure 1a and b were consistent with the pattern reported tetragonal rutile structure tin oxide, which matched well with the standard pattern (JCPDS No. 41-1445), and no characteristic peaks of impurities, such as elemental Sn or other tin oxides, were detected.
As shown in Figure 1c, the as-prepared SnO2 microspheres had dense structure without any cavities.
It is interesting that, although every small tin oxide crystallite (show as inset of Figure 2d) exhibits very obvious lattice fringes, the corresponding selected area electron diffraction (SAED) pattern (show as inset of Figure 2d) only presents a set of ring-like polycrystalline structure.
Online since: September 2013
Authors: Wei Jun Yang, Shi Ming Liu, Yong Jin Li, Yun Jing Huang, Xi Sheng Luo
Process Analysis of Rb+ and Cs+ Adsorption from Salt Lake Brine by Ammonium Molybdophosphate Composite material
YANG Weijun*, LIU Shiming, LI Yongjin, HUANG Yunjing, LUO Xisheng
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China
*E-mail: wjyang@hnu.edu.cn
Keywords: Composite ammonium molybdophosphate; Salt lake brine; Adsorption; Rubidium; Cesium
Abstract.
Results and discussion 2.1 Characterization of the adsorbents AMP was characterized by elemental analysis and XRD, and its structure was confirmed as (NH4)3PMo12O40.6H2O.
No new XRD crystal peaks appeared in the XRD spectra of AMP-ZrP-SiO2, because ZrP is amorphous structure, besides, microporous SiO2 also has no crystal peaks in XRD spectra.
Especially, the structure of AMP-ZrP-SiO2 is very stable and can be recycled for more than 8 times with little wastage.
Results and discussion 2.1 Characterization of the adsorbents AMP was characterized by elemental analysis and XRD, and its structure was confirmed as (NH4)3PMo12O40.6H2O.
No new XRD crystal peaks appeared in the XRD spectra of AMP-ZrP-SiO2, because ZrP is amorphous structure, besides, microporous SiO2 also has no crystal peaks in XRD spectra.
Especially, the structure of AMP-ZrP-SiO2 is very stable and can be recycled for more than 8 times with little wastage.
Online since: August 2007
Authors: Péter Arató, Ferenc Wéber, Zoltán Kónya, Csaba Balázsi, Imre Kiricsi, Zsolt Czigány, Zófia Vértesy, László Péter Biró
Arató
1,h
1
Ceramics and Composites Laboratory, Research Institute for Technical Physics and Materials
Science, H-1525 Budapest, Hungary
2
Thin Film Physics Laboratory, Research Institute for Technical Physics and Materials Science,
Budapest, Hungary
3
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1,
H-6720 Szeged, Hungary
4
Laboratory for Nanostructures Research, Research Institute for Technical Physics and Materials
Science, Budapest, Hungary
a
balazsi@mfa.kfki.hu, bczigany@mfa.kfki.hu, cweber@mfa.kfki.hu
d
konya@chem.u-szeged.hu, evertesyz@mfa.kfki.hu, f
biro@mfa.kfki.hu
g
kiricsi@chem.u-szeged.hu, harato@mfa.kfki.hu
Keywords: Carbon nanotube, silicon nitride, composites
Abstract.
In some parts web-like connected MWNTs can be found in structure, but individual MWNTs, properly attached to β-Si3N4 surfaces can also be observed (Fig. 2-left).
XRD results for reference SN, and composites C1 and C3 prepared as in Table 1 In the case of sample SN (reference sample without CNT addition) we found more α-Si3N4 than β-Si3N4 in structure.
If the gas pressure was increased to 20 MPa and holding time to 3 hours (at 1700°C) only β-Si3N4 can be found in the structure of composites (sample C3).
In some parts web-like connected MWNTs can be found in structure, but individual MWNTs, properly attached to β-Si3N4 surfaces can also be observed (Fig. 2-left).
XRD results for reference SN, and composites C1 and C3 prepared as in Table 1 In the case of sample SN (reference sample without CNT addition) we found more α-Si3N4 than β-Si3N4 in structure.
If the gas pressure was increased to 20 MPa and holding time to 3 hours (at 1700°C) only β-Si3N4 can be found in the structure of composites (sample C3).
Online since: February 2014
Authors: Abdullah Abdul Samat, Safira Anida Safri, Dalina Samsudin, Wan Salwani Jaafar, Nafisah Osman
The powder XRD patterns of LSCO and BCZY showed high intensity and narrow peaks perovskite phase with cubic structure which matched with JCPDS file no 48-0121 and JCPDS file no. 89-2485, respectively.
The same observation is also goes to S#2 and S#3 due to the PVP used has amide group in its structure.
The sufficient lone electron pairs of oxygen and nitrogen atoms in its structure can interact with the metal cations in LSCO and BCZY materials.
Samat, Role of electrode binder on contact formation between La0.6Sr0.4CoO3-d cathode and yttrium doped cerate-zirconate solid electrolyte, Chemistry and Materials Research Vol.3 No.1 (2013) 52-61 [5] A.A.
The same observation is also goes to S#2 and S#3 due to the PVP used has amide group in its structure.
The sufficient lone electron pairs of oxygen and nitrogen atoms in its structure can interact with the metal cations in LSCO and BCZY materials.
Samat, Role of electrode binder on contact formation between La0.6Sr0.4CoO3-d cathode and yttrium doped cerate-zirconate solid electrolyte, Chemistry and Materials Research Vol.3 No.1 (2013) 52-61 [5] A.A.
Online since: February 2014
Authors: Tjokorde Walmiki Samadhi, Melia Laniwati Gunawan, Endang Sri Rahayu, Subagjo Subagjo
Bangka kaolin DSC/TGA thermogram
Figure 1 shows an endothermic peak at 527 oC, indicating that dehydroxylation of combined water in the structure of kaolinite has taken place and metakaolin is formed.
The other peak is an exothermic peak at 1013 oC, indicating that the structure of kaolinite has changed to spinel and amorphous silica.
Breck, Zeolite Moleculer Sieves Structure, Chemistry and Uses, John Wiley & Sons, New York, (1974) [2] G.
The other peak is an exothermic peak at 1013 oC, indicating that the structure of kaolinite has changed to spinel and amorphous silica.
Breck, Zeolite Moleculer Sieves Structure, Chemistry and Uses, John Wiley & Sons, New York, (1974) [2] G.
Online since: May 2015
Authors: Andréa Kalendová, Miroslav Kohl
The Effect of Polypyrrole on Corrosive Properties of Organic Coatings Containing High Amounts of Zinc Metal Particles
KOHL Miroslav1, a* and KALENDOVÁ Andréa1, b
1University of Pardubice, Faculty of Chemical Technology, Institute of Chemistry and Technology of Macromolecular Materials, Studentská 95, 53210 Pardubice, Czech Republic
aMiroslav.Kohl@seznam.cz, bAndrea.Kalendova@upce.cz
Keywords: organic coating, conductive polymers, polypyrrole, zinc.
PPy is especially important as it has a good environmental stability [10] as well as conductivity due to heterocyclic monomer units in them which have quite a similar structure to corrosion inhibitors.
The resulting micrographs used to follow the shape and the surface structures are shown in Fig. 1. 10 % suspensions of the pigments in redistilled water were then prepared and values of pH and conductivity were followed for 28 days.
Results and discussion Basic characteristics of fabricated pigments The results of pigments basic characteristics are given in Table 1 and the resulting micrographs used to follow the shape and the surface structures are shown in Fig. 1.
PPy is especially important as it has a good environmental stability [10] as well as conductivity due to heterocyclic monomer units in them which have quite a similar structure to corrosion inhibitors.
The resulting micrographs used to follow the shape and the surface structures are shown in Fig. 1. 10 % suspensions of the pigments in redistilled water were then prepared and values of pH and conductivity were followed for 28 days.
Results and discussion Basic characteristics of fabricated pigments The results of pigments basic characteristics are given in Table 1 and the resulting micrographs used to follow the shape and the surface structures are shown in Fig. 1.
Online since: April 2014
Authors: Tian Lan, Yan Hua Liu, Zi Qiang Shao, Wen Jun Wang, Fei Jun Wang, Da Lun Zhang, Jian Quan Wang, Lin Lin Kong
The electrospun fibers possess special properties because of the remarkable high surface-to-volume ratios, and high bulk porosity with fully interconnected pore structures in comparison with conventional nonwovens[3].
Cellulose, being the most abundant biopolymer resource on the planet and also a renewable resource, can be chemically modified to produce cellulose esters or ethers for its particularly molecular structure, which containing three hydroxyl groups on each D-glucose ring[9].
This results in the deposition of long and uniform fibers as a non-woven structure.
Aminabhavi, Journal of Industrial and Engineering Chemistry, 50, 13, (2013) [14] S.O.
Cellulose, being the most abundant biopolymer resource on the planet and also a renewable resource, can be chemically modified to produce cellulose esters or ethers for its particularly molecular structure, which containing three hydroxyl groups on each D-glucose ring[9].
This results in the deposition of long and uniform fibers as a non-woven structure.
Aminabhavi, Journal of Industrial and Engineering Chemistry, 50, 13, (2013) [14] S.O.
Online since: December 2014
Authors: Bing Jun Ding, Yong Guo, Li Hua Wang, Heng Fang Meng
Modulation of low bias negative differential resistance in a molecular device by adjusting anchoring groups
Li–hua Wang1, a, Heng-fang Meng1,b, Bing–jun Ding2, c, Yong Guo 1, d *
1 School of Physics & Electronic Science and Institute of Applied Chemistry, Shanxi Datong University, Datong 037009, PR China
2 State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Shannxi 710049, PR China
awanglihua12@gmail.com, bWQ0582@163.com, cbjding@mail.xjtu.edu.cn, dybsy_guo@163.com
Keywords: Molecular device; Density functional theory; Non–equilibrium Green's function; Negative differential resistance; Anchoring group
Abstract: We investigate electronic transport properties of molecular device models constructed by a dipyrimidinyl–dimethyl molecule embedding in a carbon chain, which are then coupled to the gold electrodes through thiol or isocyanide group.
The generalized gradient approximation scheme of Perdew–Burke–Ernzerhof (GGA.PBE) is schemes are employed to describe the exchange–correlation potential in the self–consistent DFT electronic structure description.
The self–consistently calculated current–voltage (I–V) characteristics for the above sandwiched structures in the bias range from 0 V to 1.2 V in steps of 0.1 V are shown in Fig. 2.
As a result, the conductance of the structure with the isocyanide group is increased drastically at low biases.
The generalized gradient approximation scheme of Perdew–Burke–Ernzerhof (GGA.PBE) is schemes are employed to describe the exchange–correlation potential in the self–consistent DFT electronic structure description.
The self–consistently calculated current–voltage (I–V) characteristics for the above sandwiched structures in the bias range from 0 V to 1.2 V in steps of 0.1 V are shown in Fig. 2.
As a result, the conductance of the structure with the isocyanide group is increased drastically at low biases.
Online since: February 2013
Authors: Ying Pan, Xiao Feng Zhao, Zhan Chang Yang
Using region building material should not only manifest in the structure and the decoration, but also combine with the understanding of regional building material physics, chemistry, esthetics and the cultural performance.
Which require construction of the maintenance of the structure have sufficient adjustable performance to resolve this conflict is necessary to take measures can be adjusted to various parts of the building, including walls, windows, roof and so must have a removable or adjustable.
Renzo Piano applied the structure of wood and stainless steel to achieve his building models, while cleverly combining the model of decorum with natural ventilation, he make a better interpretation of the regional architecture in the inheritance of "Essence".
Which require construction of the maintenance of the structure have sufficient adjustable performance to resolve this conflict is necessary to take measures can be adjusted to various parts of the building, including walls, windows, roof and so must have a removable or adjustable.
Renzo Piano applied the structure of wood and stainless steel to achieve his building models, while cleverly combining the model of decorum with natural ventilation, he make a better interpretation of the regional architecture in the inheritance of "Essence".
Online since: March 2023
Authors: Susanne Strobl, Paul Linhardt, Roland Haubner, Maria Victoria Biezma
Due to the complex alloy compositions, these bronzes have a multi-phase structure [3], which affects the corrosion behavior.
The FeCl3 etching reveals the κ-phases as dark precipitations, whereby the remaining structure is attacked only very weakly.
Fig. 2 Compilation of different etched structures received by applying conventional etchants.
Ridley, The Morphology, Crystallography, and Chemistry of Phases in As-Cast Nickel-Aluminum Bronze.
The FeCl3 etching reveals the κ-phases as dark precipitations, whereby the remaining structure is attacked only very weakly.
Fig. 2 Compilation of different etched structures received by applying conventional etchants.
Ridley, The Morphology, Crystallography, and Chemistry of Phases in As-Cast Nickel-Aluminum Bronze.