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Online since: November 2010
Authors: Zhao Yong Chen, Jian Li Zhang, Hua Li Zhu, Wei Zhu, Qi Feng Li
T0.5, T1, T2.5, T5, T8, T10 means different mole level of Ti.with 30% carbon together The phase purity and structure were characterized by X-Ray differaction (XRD, D/max-2000 Rigaku, Japan) with Cu Kα radiation (l=15.4056nm) operating at 40 kV and 40 mA.
The major phase was indexed to the orthorhombic LiFePO4 with an ordered olivine structure of Pmnb space group (PDF NO.81-1173).
We think the redox peak pair attribute to Fe element in different crystal structure .Goodenough et al. suggest redox energies of transition metal ions are greatly influenced by the crystal structure [21] and A.
[14] Y.Liu,C.h.Mi,C.Z.Yuan and X.G.Zhang:submited to Journal of Electroanalytical Chemistry (2009)
Guo: submited to, Journal of Physics and Chemistry of Solids ,(2009)
Online since: May 2021
Authors: Ismaila Abdullahi, Ismail Zainol
Synthesis, Characterization and Bioactivity of Chitosan Hydroxyapatite Composite Doped with Strontium Ismaila Abdullahi1,a*, Ismail Zainol2,b 1Department of Chemistry, University of Abuja, PMB 117, Abuja, Nigeria. 2Polymer laboratory, Department of Chemistry, Universit Pendidikan Sultan Idris, Proton City, 35900 Tanjung Malim, Perak, Malaysia.
Fig. 2 shows a sketch of the proposed chemical structure of the interaction between chitosan and strontium doped hydroxyapatite.
The structure shows hydrogen bonding between the chitosan molecule and the doped HA.
The proposed structure of chitosan hydroxyapatite doped with 10 mole % strontium FTIR Analysis.
Sample surfaces for this specimen show more porous structure and nucleation of apatite for 21 and 28 days.
Online since: December 2012
Authors: Xue Min Zhang, Lin Jun Wang, Hong Hui Li, Lei Shao, Dong Zhang, Liang Jiao
The above parameters require to be getting through regression from the experiment data of hydrate formation, the value is various for different structure of the corresponding hydrate, concrete number seen from table 1[12, 13].
Cij is only the function of temperature T when the structure and hole type hydrate is determined
Tab. 1 Reference Properties of Structure I and Structure II Hydrates(T0=273.15) Physical parameters I type II type 1120 883.82 -4297 -4985.92 4.59590 4.99644 38.12 -0.141 Tab. 2 Constant—hydrate structure I in formula Gas Name small hole big hole Aij×102 (K/MPa) Bij×10-3 K Dij×10-6 K2 Aij×102 (K/MPa) Bij×10-3 K Dij×10-6 K2 CH4 4.964541 2.491661 0.044831 18.02382 2.48524 0.034373 C2H6 0.000000 0.000000 0.000000 0.668585 3.990423 0.044182 C3H8 0.000000 0.000000 0.000000 8.069303 3.758783 0.051258 fj is the fugacity of j component in gas phase, is calculated through PR state equation, parameters of the forecasting material used in the equation seen in table 4[12].
The Journal of Physical Chemistry, Vol. 77(1973),P.2300 [7] W.
Industrial and Engineering Chemistry Research Fundamentals.
Online since: August 2009
Authors: Ling Ling Zhu, Miao Tan, De Liang Cui, Qi Long Wang, Gang Lian, Xiao Zhang
China, 250100 2 School of Chemistry & Chemical Engineering, Shandong University, Jinan, P.
XRD, TEM and SEM are applied to characterize the structure properties.
The corresponding schematic structure of the reactor was shown in Fig. 1.
Fig. 1 Schematic structure of the reactor used in hydrothermal synthesis process Results and discussion Fig. 2(a) presents scanning electron microscope (SEM) images of a typical sample of cBN synthesized in hydrothermal-alkaline condition.
Online since: March 2012
Authors: Zhong Cheng Guo, Zhen Chen, Qiang Yu
The crystal structure was determined by X-ray diffraction; Surface morphology was test by Scanning Electron Microscopy; the energy spectrum was used to determine element mass-fraction and the ratio of atomic number of the coatings. 1 Introduction Anode material plays a key role in reducing energy consumption and improving product purity on the process of modern hydrometallurgical extraction of metal (such as: zinc, manganese, cobalt, nickel, copper, chromium, etc.) [1].
The structures of the films were analyzed by X-ray diffraction (XRD) with Co Kα radiation in a standard X-ray diffracts meter (Rigaku D/max-1200X) .The element contents were tested by Energy-dispersive spectroscopy (EDAX-Phoenix). 3 Experimental results and discussions Using X-ray diffraction (XRD) to determine the coating composition of the β-PbO2 coating on stainless steel substrate and the β-PbO2-MnO2 coating, and then observe microscopic morphology of the coatings with the method of scanning electron microscope (SEM), after determining the element content of the coatings by using EDS, we can finalize the composition of the coating. 3.1 Detection of β-PbO2 coating The β-PbO2 coating on stainless steel substrate was tested by using XRD, SEM, EDS.
[4] YU De-long, Preparation and structure properties of MnOx electrode material, Materials Protection. 1995, 28(3):12-14
Danilov, Mechanism of lead dioxide electrodeposition, Journal of Electroanalytical Chemistry. 1996, 495:127-132
Online since: September 2012
Authors: Olga Pavlova-Verevkina, Natalia Golubko, Alexander Sumbatov, Ludmila Ozerina
Comparison of the Long-term Stability of TiO2 Hydrosols with Different Concentration of Nanoparticles Olga Pavlova-Verevkinaa, Natalia Golubkob, Alexander Sumbatovc and Ludmila Ozerinad Karpov Institute of Physical Chemistry, Obuha side street 3-1/12, building 6, Moscow 105064, Russia apaver@cc.nifhi.ac.ru, bgolubko@cc.nifhi.ac.ru, calgurmail@cc.nifhi.ac.ru, dozerin@ispm.ru Keywords: TiO2 nanoparticles, hydrosols, stability, kinetics Abstract.
The obtained results will enable to determine mechanisms of the slow growth of nanoparticles and to modify nanoparticles structure.
The kinetics and mechanisms of the slow “ageing” of the sols can depend on many factors such as structure and concentration of primary TiO2 nanoparticles, pH and concentration of electrolytes in the dispersion medium, etc.
Obviously the kinetics of the slow “ageing” of TiO2 hydrosols stabilized by strong acids depends mainly on medium composition and structure of primary TiO2 nanoparticles.
Online since: August 2014
Authors: Chen Chen, Wu Fu Zhu, Shan Xu, Yuan Biao Tu, Cheng Yu Sun, Peng Wu Zheng
A novel thieno[2,3-d]pyrimidine compound (1) bearing a sulfonylurea moiety was synthesized from methyl 2-aminothiophene-3-carboxylate (2) through five steps including cyclization, chlorination, substitution with morpholine and piperazine, amidation and its structure was confirmed by 1H NMR and MS spectrum.
Thienopyrimidines PI3K pathway inhibitors are not only the most important of all types, but also the first study of this pathway and the most widely used structure.
Synthesis of compounds The structures and the synthetic route were shown in Scheme 1.
Journal of Medicinal Chemistry, 53(6), 2636-2645; 2010
Online since: January 2014
Authors: Ai Mei Yang, Xiao Long Shi, Han Han, Yun Men, Rui Wu
The structures of these compounds were elucidated as: patulitrin(1), Isoscoparin(2), swertisin(3), swertiajaponin(4).
The structures of these known compounds were identified by direct comparison of their spectral data (1H NMR and 13C NMR and DEPT) with those reported values in the corresponding literatures.
Figure 1 Structure of isolated flavonids Experimental Equipment Melting points: X-4 Digital Display Micro-Melting point apparatus,uncorr.
Sun: Chemistry of Natural Compounds, Vol. 49 (2013), in press
Online since: September 2013
Authors: Shuang Quan Liao, Yan Fang Zhao, Xiao Xue Liao, Ming Chao Luo, Wei Min Tian
Review on the Unbroken Three-dimensional Network Modification Methods of Waste Rubber Powder XiaoXue Liao1,a,ShuangQuan Liao1,YanFang Zhao1 ,MingChao Luo1 and WeiMin Tian2 1College of Materials and Chemistry Engineering, Hainan University, Hainan China, 570228 2Rubber Research Institute, Chenese Academy of Topical Agricultural Sciences, Danzhou China,571737 aliaoxx26@163.com Keywords: Waste Rubber Powder; Modification; Composite Abstract.
However, WRP with three-dimensional structure is insoluble and nonmelting and doesn’t blend with raw rubber very well.
According to extent of network structure damage, all methods are categorized into two groups that the first is the broken three-dimensional network which breaks network structure and transforms crosslinked rubber chains into small molecular weight fragments and the second is the unbroken three-dimensional network which doesn’t destroy network structure.
Although the groups of approaches on modification of WRP are researched widely, the present research seldom can be modified by unbroken network method such as grafting and in situ polymerization, which can make WRP surface covered with network structure and increase interfacial adhesion.
Online since: February 2012
Authors: Amnuay Wattanakornsiri, Claudio Migliaresi, Supranee Kaewpirom, P. Pungboon Pansila, Tongsai Jamnongkan
The surface morphology, diameter, and structure of electrospun nanofibers were investigated by scanning electron microscopy (SEM).
Introduction The electrospinning technique is currently used as an efficient processing method to manufacture nanoscale fibrous structures for a number of applications.
Chitosan (CS) is a natural polysaccharide, produced by deacetylation of chitin, and has a repeating structure unit of-(1-4)-2-amino-deoxy--D-glucan.
Morphology of electrospun nanofibers.The morphological structures and average diameter of PVA/CS electrospun nanofibers are shown in Fig. 3 and Fig. 4, respectively.
In addition, the electrospun nanofibers with the smallest fibers diameter and become is drops in the nanofibers can be obtained with the increased chitosan within the structure.