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Online since: April 2004
Authors: Hermann Haken
It deals with the spontaneous formation of spatial, temporal, or functional structures in fields ranging from physics over chemistry and biology to the cognitive sciences as well as to technology.
While originally synergetics focussed its attention on physics, chemistry and a number of model processes in biology, more recently it deals with cognitive science, especially with the development of new types of computers for pattern recognition and decision making, and with brain theory and psychology.
Online since: April 2011
Authors: Wei Jun Liu, Shou Zhi Pu, Yan Lu
A Novel Unsymmetrical Photochromic Diarylethene Weijun Liu, Yan Lu, Shouzhi Pua* Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, P.R.China a pushouzhi@tsinghua.org.cn Key words: Diarylethene; Photochromism; Fluorescence; Synthesis Abstract.
Diarylethene 1a was prepared according to the method described in scheme 2 .The structure of compound 1a was confirmed by 1H NMR(400 MHz, CDCl3): δ 2.02 (s, 3H, -CH3), 7.18(s, 1H, thienyl-H), 7.39(t,1H, phenyl-H), 7.56(d, 1H, phenyl-H), 7.58(d, 1H, phenyl-H), 7.65(s, 1H, phenyl-H), 7.67(s, 1H, phenyl-H), 7.69(d, 1H, phenyl-H), 7.73(d, 1H, phenyl-H), 7.75(t, 1H, phenyl-H).
Royal Society of Chemistry.
Online since: December 2012
Authors: Xu Hui Sun, Lin Sun, Xi Yu, Lei Wang
The Photocatalytic Activity of Bi20TiO32 for Degradation of Organic Pollutants in Different Water Quality SUN Xuhui1,a, YU Xi 1,b, SUN Lin 2,c, WANG Lei 1,d 1Chemical Engineering College, Northeast Dianli University, Jilin City 132012, PR China 2College of Chemistry, Jilin University, Changchun 130023, PR China acsxuhui@hotmail.com, b705245275@qq.com, c940196689@qq.com, c695351856@qq.com Keywords: Bi20TiO32; photocatalytic activity; ions; H2O2 Abstract: In order to test the photocatalytic activity of Bi20TiO32 under different conditions, experiments were done to compare its performance for degrading organic pollutants in water.
The specific characteristics of bismuth titanate are due to both their crystal and electronic structure.
Matthews: Journal of Physical Chemistry, 94,1990: 6820-6825
Online since: August 2014
Authors: Ning Yao, Yan Liang, Zhi Long Wang
Form samples(1) using different Zn2+and :S2- proportion , the best sample is the more Zn2+ or the more S2-.Form samples(2) using different content of Cu2+ ions, the best sample is ZnS0.999Cu0.0012+.All of the diffraction peaks could be indexed and the main three diffraction peak positions correspond to the lattice planes of (111), (220), and (311)[12-13], matching the cubic zinc β-ZnS structure(JCPDS No. 05-0566).From the Fig.2 we can see that all the sample diffraction peaks width becomes broader compared with standard card(JCPDS No. 05-0566).
References [1] DONG Dong-qing ,preparation and photoluminescent characteristics of ZnS and doped ZnS Quantum dots( M.S.DISSERTATION 2008) [2] ZHAN Xun-shou, ZHUANG Bao-hua,studies on Fluorescence Method for the Determination of copper ions with ZnS :Mn Quantum Dots vol.32(journal of Nanchang University 2010) ,p.228 [3] AsamiH,AbeY,OhtsuT,etal.J.Phys.Chem.B,2003,107(46):12566—12568 [4] ShavelA,GaponikN,EychmuellerA.J.Phys.Chem.B,2004 ,108(19) :5905—5908 [5] Chen Wei,New Fluorescence Material-Quantum Dots and their Application in Life Science vol.6(Chemistry Online 2007),p.403 [6] DING Shai-Xia,ZnS Hollow Nanospheres :Synthesis and Optical Proerties vol.23(Chinese Journal of inorganic chmistry 2007),p.2003 [7] HAO Wei ,SUN Zhang-Xi Synthesis of zinc sulfid Nanoparticles by Precipitate Dissolution vol.23(Chinese Journal of inorganic chmistry 2007),p.461 [8] LIU Jin-song solid-state synthesis and Optical Absorption Properties of ZnS Nanoparticles,vol.23 (Chinese Journal of inorganic
&Tech 2005),p.288 [10] LI Guo –Ping, Hydrothermal Preparation of ZnS Nanowires vol.23 (Chinese Journal of inorganic chmistry2007), p.1864 [11] HUANG Feng hua, PENG Yi-ru Preparation and Fluorescence Property of ZnS Quantum Dots (Chinese Journal of Synthetic Chemistry 2004),p.529 [12] Lingling Peng, Yuhua Wang, Effects of the Template Composition and Coating on the Photoluminescence Properties of ZnS:Mn Nanoparticles, Nanoscale Res Lett ,2010,pp839–845 [13] Xiang Yin, Resarch of Biological Labeling and Gene Transfeetion with CdTe Quantum Dots Synthesized in Water Phase, CENTRALSOUTH UNIVERSITY, 2011
Online since: February 2007
Authors: Wan Jiang, Qing Song Peng, Jing Feng Li
Recently, many wet- chemistry-based routes were also developed to prepare ultrafine powders for PLZT ceramics, such as hydrothermal, co-precipitation and sol-gel processes.
Wet-chemistry-based methods usually involve the use of expensive or environmentally sensitive chemicals, making them difficult to deal with and time consuming.
The phase structures of the PLZT powders were in- vestigated with X-ray diffraction (XRD).
Online since: July 2015
Authors: Elias Bumbaris, Koon Yang Lee, Alexander Bismarck, Marta Fortea-Verdejo
Bacterial cellulose reinforced flax fibre composites: Effect of nanocellulose loading on composite properties Marta Fortea-Verdejo 1, a *, Elias Bumbaris 1, b,, Koon-Yang Lee2,c and Alexander Bismarck 1,3,d 1 Institute for Materials Chemistry and Research, Department of Chemistry, Universität Wien, Währinger strasse 42, 1090 Wien, Austria 2 The Composites Centre, Department of Aeronautics, Imperial College London, SW7 2AZ, UK. 3 Polymer and Composites Engineering group, Department of Chemical Engineering, Imperial College London, SW7 2AZ, UK.
In order to utilise the strength of the nanofibrils within the composites, the network structure formed by the nanofibrils upon drying needs to be homogeneous and thus the manufacturing process of the composites needs to be controlled.
Online since: February 2014
Authors: Jin Zhu Zhang, Si Si Zhu, Wei Yu Yang
Based on the results determined by X-ray diffraction and the cerium arsenic system diagram, this phase has a CeAs crystal structure.
Interaction of Lanthanum or Cerium with Nickel and Arsenic Phase Diagrams and Structural Chemistry [J].
Inorganic Chemistry, 2010, 49: 2325-2333.
Online since: October 2013
Authors: Shan Shan Gong, Qi Sun, Qing Kun Yang
Synthesis of α-L-Rhamnosy-1-Phosphoramidates via H-Phosphonate Monoesters Qingkun Yanga, Shanshan Gong b,*, Qi Sunc Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University 605 Fenglin Avenue, Nanchang, Jiangxi 330013, PR China aemail: yangqingkun6@gmail.com, bemail: gongshanshan33@gmail.com, cemail: sunqi96@tsinghua.org.cn Keywords: Phosphoramidate; H-Phosphonate; Oxidative coupling; Glycoside Abstract: A series of α-L-rhamnosyl-1-H-phosphoramidates were synthesized by an efficient oxidative coupling reaction of α-L-rhamnosyl-1-H-phosphonate with amino compounds.
This is because the anomeric carbon of sugar substrates is reactive due to the low electron density, the configuration of anomeric position may affected by certain reaction conditions, and the phosphoramidate structure are chemically unstable under both high and low pH conditions [8].
Koziolkiewwicz, Chemistry & Biodiversity.
Online since: October 2014
Authors: Dwi Siswanta, Jumina Jumina, Putri Widya Mulya, Budiana I M. Gusti Ngurah
Ngurah4 1,2,3 Department of Cemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara, Bulaksumur 55281 Yogyakarta, Indonesia 4Department of Chemistry, Faculty of Education, Nusa Cendana University, Kupang, Indonesia putriwidyamulia@yahoo.com*, pak_jumina@yahoo.com, dsiswanta@ugm.ac.id, budianagusti@yahoo.co.id Keyword: Salicydehyde, Pb(II), calixresorcinarene Abstract.
Identification using infrared (FTIR), proton and carbon nuclear magnetic resonances (NMR), as well as high resolution mass spectrometers confirms the assigned structure.
[6] Adamson, A.W.; Gast A.P.: Physical Chemistry of Surfaces (Wiley-Interscience, New York, 1997).
Online since: July 2015
Authors: Suryanto Suryanto, Gunawan Gunawan, Iis Sopyan
Due to the CaP structure is of special importance to human hard tissues since they represent the inorganic part of human bones and teeth.
[7] Gunawan, Sopyan I, Suryanto, Naqshbandi A, Indian Journal of Chemistry Section a-Inorganic Bio-Inorganic Physical Theoretical & Analytical Chemistry 54A (2014) 152-8