Search results

In Depth Analysis on the Excitation Spectrum of SrS: Eu2+, Dy3+ Xiaoxia Duan1, a, Shihua Huang2, b, Lixin Yi2, c, Wenchao Wei1, d 1Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China 2Key Laboratory of Luminescence and Optical Information, Ministry of Education, and Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044，China axxduan@bjtu.edu.cn, bshhuang@bjtu.edu.cn, clxyi@bjtu.edu.cn, d10273021@bjtu.edu.cn Corresponding author.
The crystalline structure was characterized by using X-ray diffraction (XRD).
Crystal structure of the sample was carried out with Rigaku D/max-2000 X-ray diffraction, using Cu Kα of 1.5405 Å as the X-ray source.
The diffractive peak positions are in good accordance with the JCPDS card of 08-0489, which indicates that the SrS sample is well crystallized in cubic structure.
Principles for corrected fluorescence spectroscopy by Rhodamine B, Chemistry Online. 10 (2005) 771-775

Effect of deashing treatment on the coal structure and surface groups Shixiong HAO a, Xingyong LIU b and Zuxiao YU c College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong, China ashxionghao@126.com, bxingyong.l@163.com, cyuzuxiao@126.com Keywords: Coal, Deashing treatment, X-ray photoelectron spectroscopy, Texture.
In this paper, the effects of using HF/HCl mixture solution on surface structure and chemistry of coal sample were investigated.
The structure of coal pore was changed probably because of the reaction between inorganic salts of raw coal and the solution.
In order to understand the change of the surface chemistry during the deashing progress, the deconvolution of XPS spectra of raw and deashed coal samples are given in Fig.1 and Fig.2, respectively.
With the comparison of Fig. 2 and Fig. 3, the C 1s spectra and N 1s spectra show no significant difference, which indicate that the structure of coal is not destroyed during the deashing treatment.

Self-assembled Nano-Structures of Sandwich-type Mixed (Phthalocyaninato)(porphyrinato) Rear Earth complexes.
Effect of porphyrin-phthalocyanine ligands on Tuning the Inter-molecular Interaction Lina Chen1,a,Yanli Chen*1, b, Peihua Zhu1,c , Guoxin Sun 1,d , Hongyan Wang1,e,and Jianzhuang Jiang*2,f 1 School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China 2 Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China a nana19870105@163.com, f jianzhuang@ustb.edu.cn Keywords: phthalocyanine, porphyrin, sandwich rare earth complex, nanostructure, self-assembly.
Introduction Nano-structures self-assembled from molecular materials with conjugated electronic molecular structure have attracted increasing research interests in the field of nano-science and nano-technology due to their potential applications in nanoscale electronic and optoelectronic devices [1].
The dimensional size for a dimeric supramolecular structure as discussed before formed from two double-decker molecules of Ce(DPP)(Pc) (1) obtained from the minimized molecular structure is 2.70 nm (length) × 1.42nm (width) × 0.56 (height) nm using PCMODEL for windows Version 6.0, Serena Software.
Schematic molecular structures of Ce (DPP)(Pc) (1), Sm2(DPP)(Pc)2 (2) and Sm2(DPP)2(Pc) (3) Fig.4.

The introduction of Al damaged the order of the original structure.
Journal of Physical Chemistry A. (1995) 99(12): 4148-4112
Chemistry of Materials. (1999) 11(5)
Industrial & Engineering Chemistry Research. (2001) 40(15): 3237-3261
Journal of Physical Chemistry C Nanomaterials & Interfaces. (2009).

Coordination chemistry of ligands of this type has never been studied before.
Structures and relative energies of coordination isomers of complex 1 are shown in Fig. 1.
Elguero, Double addition of azoles to glyoxal: Characterization of the bis-adducts and theoretical study of their structure, Arkivoc. (2007) 55-66
Applications in Coordination, Organometallic, and Bioinorganic Chemistry, Wiley-Interscience, Hoboken, 2009
Hausen, Infrared Spectra-Structure Correlation Study of Vanadium-Oxygen Compounds, Anal.

Fig.1 shows the molecular structure of compounds 1, 2, and 3.
Chemistry - A European Journal 8(23): (2002) 5435-5446
Analytical Chemistry 74(14): (2002) 304-3311
Analytical Chemistry 52: (1980) 1929-1931
Analytical Chemistry 66: (1994) 484-491.

Krasil’nikov1,d 1 Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, ul.
These membranes are considered to be model filtration systems because of their structure.
It was possible to study their structure using transmission electron microscope JEM-2100 (composite membrane acts as a sample holder) (Fig. 2- a, b).
Causserand, Role of the cell-wall structure in the retention of bacteria by microfiltration membranes, Journal of Membrane Science 326 (2009) 178-185
Mchedlishvili, Current-Voltage Characteristics of Metal-Coated Track Membranes Measured in Air and Vacuum, Petroleum Chemistry 53 (2013) 609-611

Because Co2 + and Zn2 + ions outer d orbital electronic structure are different, they have different nature.
Chinese Journal of Inorganic Chemistry.
Journal of Solid State Chemistry.
Journal of the European Ceramic Society.Vol. 23 (2003), p. 2289 [20] Gongdu Zhou, Lianyun Duan: Fundamentals of Structure Chemistry(Beijing University Press, china 2002)
Journal of Solid State Chemistry, 1991, 90, p. 54 [24] A.

Its and other four important unreported intermediates’ structures were characterized by IR, 1H NMR, MS, etc.
It is very important to prepare its derivatives and carry out their structure-activity research.
Chemistry & Bioengineering, 2006, 23(4), 15-16
Chemistry Letters, 1981, 36, 367-370
Chinese Journal of Organic Chemistry, 2005, 25(11), 1416-1419

Microstructure, Stiffness and Corrosion of Bare and Phosphated Specimens Made by Sintering of Structured Iron-Iron Oxide Spheres Miriam Kupková1,a*, Martin Kupka2,b, Renáta Oriňaková3,c and Radka Gorejová3,d 1Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Košice, Slovakia 2Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, Košice, Slovakia 3Department of Physical Chemistry, Institute of Chemistry, Faculty of Science, P.J.Šafárik University, Moyzesova 11, Košice, Slovakia amkupkova@saske.sk, bkupkam@saske.sk, crenata.orinakova@upjs.sk, dradka.gorejova@student.upjs.sk Keywords: Iron-based biomaterials, Iron oxides, Galvanic corrosion, Stiffness, Phosphate coating.
Structured particles were pressed into prismatic compacts and sintered.
Fig. 1 Morphology (left) and cross-sectional structure (right) of starting iron-oxide powder particles.
Fig. 2 shows a general view and cross sections of structured iron-iron oxide particles of a partly reduced powder.
Fig. 2 Morphology (left) and cross-sectional structure (right) of partly reduced powder particles.