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Online since: April 2007
Authors: Zhi Xue Qu, Wei Pan, Chun Lei Wan, Ye Xia Qin
The defect chemistry due to doping can be represented using the
Kröger-Vink notation by the following equations,
.
And the occurrence of "super- lattice" 311, 331 and 511 peaks suggests that the pyrochlore phase structure of Sm2Zr2O7 do not collapse with the doping of MgO.
And the samples still kept pyrochlore structure from XRD results.
And the occurrence of "super- lattice" 311, 331 and 511 peaks suggests that the pyrochlore phase structure of Sm2Zr2O7 do not collapse with the doping of MgO.
And the samples still kept pyrochlore structure from XRD results.
Online since: January 2005
Authors: Malini Bapat, Anjali A. Athawale
Athawale* and Malini Bapat
Department of Chemistry, University of Pune, Pune, India-411007
*agbed@chem.unipune.ernet.in
Keywords: Perovskite, metathesis, ultrasonication, soft solution, composite
hydroxide
Abstract :
Barium zirconate, a perovskite oxide has been synthesized by a new procedure
using solid state metathesis reaction precursors subjected to sonication.
The fine powder obtained by sonication shows x-ray diffraction pattern identifiable to the cubic structure of BaZrO3.
There is also the probability of crystalline water present in the hydrated metal salts playing a critical role .The hydrated metal salts have point structures with defects and relatively lower lattice energies thereby reduced activation energy and increased reaction rates [10].
The fine powder obtained by sonication shows x-ray diffraction pattern identifiable to the cubic structure of BaZrO3.
There is also the probability of crystalline water present in the hydrated metal salts playing a critical role .The hydrated metal salts have point structures with defects and relatively lower lattice energies thereby reduced activation energy and increased reaction rates [10].
Online since: July 2004
Authors: I. Prosyčevas, Asta Guobienė, J. Puišo, Sigitas Tamulevičius
Introduction
A number of technologically important properties of polymeric materials are controlled by their
surface chemistry and morphology.
Geometrical parameters of surface of the polymeric films Some elements of partially ordered structures (Fig. 2) can be found for the blends on silicon with the average period 900 nm.
Polymer Height (nm) Linear size (nm) Ra (nm) PS on Si(100) substrate 16.3 496 2.7 PS on silica substrate 14.3 - 1.8 PS50%/PMMA50% on Si(100) substrate 25.4 774 6.3 PS50%/PMMA50% on silica substrate 7.3 - 2.3 PMMA on Si(100) substrate 75.3 930 15.2 PMMA on silica substrate 15.5 - 3.0 Fig. 2 AFM image of a dip-coating PS50%/PMMA50% film (film thickness A=40 nm) on crystalline Si(100), (scan size 6µm×6µm): a) 3D image, b) profile of topography a) b) b) Fig.1 Fitting of O1s peak for silicon substrate before a) and after b) plasma treatment Intensity (arb.units) Intensity (arb.units) a) As discussed earlier [3-5], the structures observed in the case of PS/PMMA blend film are the result of the formation and "breathing" of the growing film.
Geometrical parameters of surface of the polymeric films Some elements of partially ordered structures (Fig. 2) can be found for the blends on silicon with the average period 900 nm.
Polymer Height (nm) Linear size (nm) Ra (nm) PS on Si(100) substrate 16.3 496 2.7 PS on silica substrate 14.3 - 1.8 PS50%/PMMA50% on Si(100) substrate 25.4 774 6.3 PS50%/PMMA50% on silica substrate 7.3 - 2.3 PMMA on Si(100) substrate 75.3 930 15.2 PMMA on silica substrate 15.5 - 3.0 Fig. 2 AFM image of a dip-coating PS50%/PMMA50% film (film thickness A=40 nm) on crystalline Si(100), (scan size 6µm×6µm): a) 3D image, b) profile of topography a) b) b) Fig.1 Fitting of O1s peak for silicon substrate before a) and after b) plasma treatment Intensity (arb.units) Intensity (arb.units) a) As discussed earlier [3-5], the structures observed in the case of PS/PMMA blend film are the result of the formation and "breathing" of the growing film.
Online since: February 2011
Authors: San Li Yue, Juan Yang, Mei Ling Fu, Nian Fen Wu, Fang Wen Li, Hai Wu Jia, Song Jiang Ma
Preparation and characterization of modified bamboo-charcoal
by Ferric Sulfate dipping and microware radiation
Fangwen Li1,a, Sanli Yue2,b, Songjiang Ma1,c, Juan Yang1, Nianfen Wu1,
Haiwu Jia1 and Meiling Fu1
1School of Chemistry and chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, P.R.China
2Civil & Environment Engineering School, University of Science and Technology Beijing,
Beijing 100083, P.R.China
alifangweng1@126.com, b sallyyue@yahoo.com.cn, cmasongjiang@gmail.com
Key word: Bamboo-charcoal, Ferric sulfate, Dipping, Microwave irradiation, Preparation
Abstract.
Fortunately, bamboo-charcoal has many good properties such as developed pore structure, large surface area, excellent adsorption performance, wide source and renewable [7].
It can be observed that pore structure of bamboo-charcoal has come to obvious chances from Fig.1.
Fortunately, bamboo-charcoal has many good properties such as developed pore structure, large surface area, excellent adsorption performance, wide source and renewable [7].
It can be observed that pore structure of bamboo-charcoal has come to obvious chances from Fig.1.
Online since: September 2011
Authors: Hua Ping Wang, Bao Chun Wang, Guan Sen Jiang, Xun Chen, Di Wu, Yu Mei Zhang
It is probably attributed to the possibility of formation of the temporary entangled network is enhanced in the higher concentration, resulting in longer time for the polymer entangled structure to achieve relaxation in the higher concentration.
This typical departure with steady shear viscosity smaller than complex viscosity is often observed for thixotropic suspensions of weakly flocculating particles, where the structure is easily broken down by steady shear [10].
Green Chemistry, 2001. 3(4): p. 156-164
This typical departure with steady shear viscosity smaller than complex viscosity is often observed for thixotropic suspensions of weakly flocculating particles, where the structure is easily broken down by steady shear [10].
Green Chemistry, 2001. 3(4): p. 156-164
Online since: August 2015
Authors: Irana Eka Putri, M. Leonard Sidik, Ruri Agung Wahyuono, Doty Dewi Risanti, Dyah Sawitri
The scheme of DSSC fabrication is layer of DSSC was arranged in sandwich structure (TCO + TiO2 paste – natural dyes – electrolyte – TCO + Carbon).
Multilayer of co-sensitization dye structure can improve the light-harvesting capability of DSSC.
Tingli, Dye-sensitized Slar Cells Using 20 Natural Dyes as Sensitizers, Journal of Photochemistry and Photobiology A Chemistry 219 (2011) 188-194
Multilayer of co-sensitization dye structure can improve the light-harvesting capability of DSSC.
Tingli, Dye-sensitized Slar Cells Using 20 Natural Dyes as Sensitizers, Journal of Photochemistry and Photobiology A Chemistry 219 (2011) 188-194
Online since: July 2015
Authors: Xing Yong Gu, Shao Ling Wu, Ting Luo, Jun Ming Wu
Based on the plentiful hydroxyls, the starch could carry out some chemistry reactions with many other substances [10].
Probably, the reason is that the water what is absorbed in the heating solidified process be a part of the structure of the green body.
And in the sintering process, the solidified starch and water were burned out and the porosity structure was forming (showed in Fig.3).
Probably, the reason is that the water what is absorbed in the heating solidified process be a part of the structure of the green body.
And in the sintering process, the solidified starch and water were burned out and the porosity structure was forming (showed in Fig.3).
Online since: January 2012
Authors: Ping Guan, Xiao Ling Hu, Li Zhu
The Binding Performance of Erythromycin Imprinted Polymeric Microspheres
Ping Guan1,2a, XiaoLing Hu1,2b, Li Zhu1,2c
1School of sciences, Northwestern Polytechnical University, Xi’an 710072, China
2The Key Laboratory of Space Applied Physics and Chemistry ,Ministry of Education,
Xi’an, 710072, China
aguanping1113@nwpu.edu.cn (coresponding author), bhuxl@nwpu.edu.cn, c trangli@163.com
Keywords: Erythromycin, molecularly imprinted polymer, microspheres, binding
Abstract Erythromycin molecularly imprinted polymeric microspheres(EM-MIPMs) which have good shape and well-distributed size were prepared by suspension polymerization in aqueous phase, using EM as a template and methacrylic acid (MAA) as a functional monomer.
Fig. 1 Chemical structure of erythromycin.
Fig. 5 The interaction between EM and MAA and the structure of imprinted cavity.
Fig. 1 Chemical structure of erythromycin.
Fig. 5 The interaction between EM and MAA and the structure of imprinted cavity.
Online since: May 2011
Authors: Yong Chun Dong, Shi Xiong Yi
Adsorption of Acid Dyes onto Wool in TX-100 Reverse Micelles
Shixiong Yia, Yongchun Dongb
Division of Textile Chemistry & Ecology, School of Textiles,
Tianjin Polytechnic University, Tianjin 300160
a2006yishixiong@163.com, bdyefib@126.com
Keywords: Adsorption; Acid dyes; Wool; Reverse micelles
Abstract: The non-ionic reverse micelles used for dyeing wool were prepared with a non-ionic surfactant Triton X-100 (TX-100) by injecting small amount of acid dye aqueous solution.
Characteristics of isothermal adsorption Three water-soluble anionic acid dyes with different molecular structures presented in Table 2 used to investigate the characteristics of isothermal adsorption of the acid dyes on wool yarns at pH=2 and 333K, and the relationship between Ce and Qe was obtained from Fig.2.
Additionally, the adsorption of the dyes on wool is also dependent on their molecular structure characteristics.
Characteristics of isothermal adsorption Three water-soluble anionic acid dyes with different molecular structures presented in Table 2 used to investigate the characteristics of isothermal adsorption of the acid dyes on wool yarns at pH=2 and 333K, and the relationship between Ce and Qe was obtained from Fig.2.
Additionally, the adsorption of the dyes on wool is also dependent on their molecular structure characteristics.
Online since: April 2012
Authors: C. Wessapan, U. Sotanaphun, S. Limsirichaikul, A. Chaidedgumjorn, K. Cheewatanakornkool, Pornsak Sriamornsak
Sriamornsak1,2,*
1 Department of Pharmaceutical Technology, 2 Pharmaceutical Biopolymer Group (PBiG), 3 Department of Pharmaceutical Chemistry, 4 Department of Pharmacognosy,
5 Department of Biopharmacy, Faculty of Pharmacy,
Silpakorn University, Nakhon Pathom 73000 Thailand
Email:pornsak@su.ac.th
Keywords: Pectin, Bile salt, Binding, Enzyme Cycling Method
Abstract.
The linear structure of pectin is partly interrupted by (1,2)-linked side chains consisting of L-rhamnose residues and some others neutral sugars, such as arabinose, galactose and xylose (1).
This may be due to the difference in molecular structure of sodium cholate hydrate which has more hydrogen atom and can form more hydrogen bonding with pectin.
The linear structure of pectin is partly interrupted by (1,2)-linked side chains consisting of L-rhamnose residues and some others neutral sugars, such as arabinose, galactose and xylose (1).
This may be due to the difference in molecular structure of sodium cholate hydrate which has more hydrogen atom and can form more hydrogen bonding with pectin.