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Online since: September 2013
Authors: Yu Hu, Ying Chun Li, Xiao Xiao Zhuang, Xiao Xia Sun
Chiral Discrimination of the Diastereomeric Salts with (R)-Nipecotic acid and Tartaric acid Derivative SUN Xiaoxia1,a*,LI Yingchun1,b, ZHUANG Xiaoxiao1,c, HU Yu2,d* 1Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, People’s Republic of China 2Experimental Chemistry Center, Nanchang University, Nanchang 330031, Jiangxi Province, China asunxiaoxia77@126.com; blyc8751902@163.com; czhuangxiaoxiao1987@163.com; dhuyu@ncu.edu.cn Keywords: (R)-nipecotic acid; resolution; Molecular complex; molecular recognition; self-assembly Abstract: An effective resolving agent, (D)-dibenzoyl tartaric acid (2b), was screened to yield direct resolution of (S)- ethyl nipecotate (1) with high optical purity and yield.
The less-soluble salt formed a supra molecular structure by enantio differentiating self-assembly.
From the different absorptions of the two diastereomeric salts, we can infer the difference of the two salts in the structure is also relatively large, so two diastereomeric salts have great different solubility.
It is interesting that the less-soluble salt form well defined, and extremely ordered supramolecular structures via hydrogen bonded networks.
The structures were solved with direct methods by using SHELXL-97 and refined by full-matrix least-square calculation on F∧2∧ with SHELXL-97.
Online since: October 2010
Authors: Guillermo Monrós, Carina Gargori, Mario Llusar, Araceli García, Roberto Galindo
New ceramic pigment structures.
Several authors have studied perovskite as ceramic pigment structure: (i) R.A.
Popović, J. of Molecualr Structure, Vol. 744-747 (2005), p. 535-540
Cruciani, Journal of Solid State Chemistry, Vol. 179 (2006), p.233–246
Monrós, Green Chemistry, Vol. 3 (2001), p. 238-242
Online since: July 2011
Authors: Ji Li Zha, Shao Yong Xu, Guo Qiang You, Si Yuan Long
Most of magnesium structures are today produced by die-casting.
During magnesium die-casting, a large proportion of purchased ingots are transferred into different types of processing scraps in terms of bulk scraps (such as runners, shot-biscuits, overflows and used and rejected castings), low grade scraps (such as dross and slag from recycling and dosing furnaces), and high risk scraps (such as cutting chips, grinding powders and flashes) in accordance with their geometry, chemistry and potential to ignition.
However, the use of chlorite flux not only increases the probability of producing flux related new impurities and flux contamination to the recycled melt, but also is prone to produce hydrochloric acid vapors that quickly etches the surrounding equipments and building structures.
The chemistry variation during recycling of both cold and hot chamber die casting scraps with the SinoST system are given in Table 1.
Table 1 The Chemistry of Purchased Ingot, Scrap and Recycled Ingot Sample Al Zn Mn Si Fe Cu Ni AZ91D 8.3 ~9.7 0.35 ~1.00 0.15 ~0.50 £ 0.10 £ 0.005 £ 0.030 £ 0.002 YunHai Ingot 8.62 0.64 0.16 0.03 0.002 0.005 0.001 Magnesium scrap of cold-chamber die casting Runner 8.65 0.64 0.17 0.03 0.003 0.005 0.001 Scrap Casting 8.57 0.70 0.17 0.03 0.003 0.005 0.001 Recycled Ingot from cold-chamber die casting scrap Ingot No.300 8.57 0.66 0.17 0.03 0.003 0.005 0.001 Magnesium scrap of hot-chamber die casting Scrap 1 8.60 0.65 0.115 0.045 0.0102 0.0050 <0.0012 Scrap 2 8.85 0.60 0.130 0.045 0.0094 0.0051 <0.0012 Recycled Ingot from hot-chamber die casting scrap without Fe control technique Ingot No.58 9.49 0.73 0.1430 0.0460 0.0110 0.0056 <0.0012 Ingot No.1098 8.91 0.57 0.1720 0.0390 0.0099 0.0030 <0.0012 Recycled Ingot from hot-chamber die casting scrap with Fe control technique Ingot No.3036 9.06 0.70 0.1920 0.0410 0.0039 0.0046 <0.0012 Ingot No.10980 9.14 0.69 0.1940 0.0420 0.0028 0.0045 <0.0012
Online since: May 2004
Authors: Miroslav Hnatko, Pavol Šajgalík, Miroslav Balog
Šajgalík Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovak Republic Keywords: Si3N4/SiC nanocomposites, in situ carbothermal reduction, intra SiC nanoinclusions Abstract.
This discussion has not taken into account the possible change of the overall chemistry by addition of SiC and/or carbon into the system.
The aim of present paper is to explain the formation of two types of SiC inclusions usually reported for these systems based on the chemistry.
Samples Si3N4 Y2O3 SiO2 Carbon black SiNC SNY20 75 5 - - 20 SYC - 47.5 32.5 20 - SNYC 84.1 4.4 7.4 4.1 - SNY+5%SiC 95 5 - - - Surfaces of completely melted specimens were polished and plasma etched with a gas mixture of CF4 and O2 to highlight the grain structures in the Polaron plasma barrel etcher PT 7150.
[3] Sasaki, G., Suganuma, T., Hiraga, K., Niihara, K.: Interface Structure of Si3N4 Matrix Composite with Nano-Meter Scale SiC Particles, Mar.
Online since: April 2016
Authors: Wei Dong Qi, Fen Xu, Yong Jin Zou, Hai Liang Chu, Li Xian Sun
PtCo Nanoparticles Supported on Carbon for Hydrolysis of Ammonia Borane Wei-dong Qi, Li-xian Suna, Fen Xub, Yong-Jin Zou and Hai-Liang Chu Guangxi Key laboratory of information Laboratory, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, School of Material Science & Engineering, Guilin University of Electrical Technology, Guilin Guangxi 541004,China) asunlx@guet.edu.cn, bxufen@guet.edu.cn Keywords: PtCo nanoparticles, Catalytic hydrolysis, Porous carbon, Ammonia borane Abstract.
The different steps indicate that PtCo nanoparticles loaded on porous carbons change the structure of porous carbons.
Macgregor: Royal Society of Chemistry, vol. 5(6), p. 2546
Ma: Chemistry, vol. 18(2012), p. 7925
Xu: Chemistry, vol.16(10), p. 3132
Online since: December 2003
Authors: Maria Vallet-Regí, M.V. Cabañas, Isabel Izquierdo-Barba, N. Hijón
These bands are assigned to a B-type carbonate substituting for phosphate groups in the apatite structure [5].
Fowler, Inorganic Chemistry, vol. 13 (1974), p. 194-206
Elliot, "Structure and Chemistry of the Apatites and other Calcium Orthosphosphates", Studies in Inorganic Chemistry 18, (Ed.
Online since: December 2011
Authors: Ming Zheng Liang, Tao Xie, Yi Luo, Mei Li, Shuang Fei Wang
Thermodynamics of phenol adsorption onto Activated Carbon Fiber Mei Li 1,2, Yi Luo3 ,Tao Xie2, Mingzheng Liang2, and Shuangfei Wang 1, a 1School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004,China 2College of Chemistry and Eco-engineering of Guangxi University for Nationalities , Key Laboratory of Chemical and Biological Transforming Process, University of Guangxi; Nanning, 530006, China 3Bureau of Human Resources and Social Security of Nanning Guangx, Nanning, 530000 Guangxi, China aCorresponding author , emilyve656@163.com Keywords: activated carbon fiber, phenol, adsorption, thermodynamics.
Activated carbon fibres (ACFs) are porous carbons with a fibre shape and a well-defined porous structure, which are very promising materials because of their high adsorption capacity and rate.
The use of activated carbon fibres has been continuously growing in recent years[2].Porous carbon materials, a material with porous structure and large internal surface area, is commonly used as adsorbent for the removal of organic matter micropollutants (i.e. pesticides, phenols, aromatic hydrocarbons, humic substances, etc.) in drinking water treatment[3-5].
Rivera-Utrilla: Chemistry and Physics of Carbon Vol.27, (2001), p. 227–406
Online since: October 2013
Authors: Hao Yong Yin, Jun Hong Tang, Chun Jie Yan, Qiu Lin Nie, Dan Wu, Qiao Yi Wang
China 2Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, P.R China ayinhaoyong@163.com, btang_jhjh@163.com, cchjyan2005@126.com, dnqlzju@163.com, e494763308@qq.com, fwangqiaoyi1989@163.com Keywords: Nanosheets; Photocatlyst; In2S3 Abstract.
Introduction Much effort has been directed toward the synthesis of nanomaterials with controlled shapes and ordered morphologies due to their unique properties that are not conceivable in bulk structures.
Although there are some reports about the photocatalytic activities of In2S3 for organic pollutant degradation, the studies are still limited and the preparation of new structured In2S3 nanomaterials with mild condition is also significative.
Shen, Materials Chemistry and Physics Vol. 110 (2008), p. 332 [7] A.
Chaudhuri, Materials Chemistry and Physics Vol. 102 (2007), p. 195 [8] L.
Online since: February 2012
Authors: Ai Li Sun, Qian Hua Zhu, Yue Hua Chen
A Novel Thiocyanate-selective membrane Sensors based on Salicylaldehyde-o-Aminophenol Binuclear Copper (II) Complex as a Neutral Carrier Aili SUN1, a, Yue Hua CHEN 2, QianHua ZHU 3 1 School of Chemistry and Chemical Engineering, Xinxiang University ,Xinxiang 453000, China 2 College of Chemistry and Enviromental Science,Henan Normal University, Xinxiang 453007, China 3 School of Chemistry and  Chemical Engineering Yangtze Normal University, Chongqing 408100, China a sunailifly@126.com Keywords: binuclear carriers salicyladehyde-o -aminophenol binuclear copper (II) [Cu 2(II)-SOA] , Neutral carrier, Ion-selective electrode Abstract.
These deviations result from a direct interaction between the central metal of the membrane-active components and the analytical anion and steric effect associated with the structure of the ligand.
M = Cu(II) ,Zn(II) M = Cu(II) Fig. 1 Structures of binuclear carrier salicyladehyde-O-aminophenol binuclear and salicyladehyde aminophenol metallic complexes.
Online since: February 2012
Authors: Bo Zhang, Wei Zhang, Yu Long Zhang, Da Han, Yong Liang Zhou
Trapping Yeast Cells on PDMS Micropillar Array Wei Zhang1, , Bo Zhang1,Yulong Zhang2, Da Han1,Yongliang Zhou1,* 1 State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China 2 Pen-Tung Sah Micro-Nano Technology Research Center, Xiamen University, Xiamen 361005, China *ylzhou@xmu.edu.cn Keywords: Cell Array, Cell Trapping, Micropillar Array, Hydrophilic/Hydrophobic Pattern Abstract.
As a result of limited contact area of ball shaped yeast and plane substrate, trapping methods relied mainly for yeast arraying in single cell level, such as confinement in micro structures including cavities [6] and wells [7], by utilizing gravity, hydrodynamic force and capillary force.
The results showed that almost no yeast cells were immobilized when not using PLL or pillar structures, which illustrate that both of physical process and chemical process are critical for the immobilization of the yeast cells.