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Tissue engineering tries to mimic this structure by carrying out the hydroxyapatite synthesis in the presence of collagen.
The main reason of this choice is the preponderance of these components in the bone tissue, as bone structure is composed by nanocrystals of HA with the c-axis aligned to the Col fibres in a specific way [5].
Parry: Biophysical Chemistry, Vol. 29 (1988), p. 195-209
Elliott: Structure and Chemistry of the Apatites and other Calcium Orthophosphates (Amsterdam, Elsevier Science, 1994).

A Novel Polymer Supported Catalyst for Preparation of Sydiopolystyrene Taiqi Liu1,2,a , Ning Gao1,b,Yue Wang1, Liangfa Gong1, Youliang Hu2 1Research Center of Ecomaterial , Beijing Institute of Petrochemical Technology, Beijing, China 2State Key Laboratory of Engineering Plastics, Institute of Chemistry, the Chinese Academy of Sciences, Beijing, China aliutaiqi@bipt.edu.cn, bgaoning@bipt.edu.cn Keywords:Polymer supported catalyst; TiCl4; sydiopolystyrene; poly(styrene-co-ethylene); polymerisation.
Results and discussion Property of coordinated catalysts for olefin polymerization have great relation with their structure[1,2,3], in addition to syntheses of new catalysts with a design of new ligands, the immobilization, which immobilize a catalyst on a support, is an important method both in theoretical study and industrial applications.
Sch. 1 Polymer catalyst structure Fig. 1 IR spectra of Polymer catalysts IR spectra of Polymer catalysts I(PAN/TiCl4=1:2) and II(PAN/TiCl4=1:1) show that when the ratio of PAN/TiCl4 is 1/1(mol./ mol.), the IR spectrum shows two peaks, 2233cm-1 and 2277cm-1, this means that, there is some free acronitrile group left which shows a CºN stretching at 2233cm-1.The polymerisation result shows that the polymer catalyst have a much higher catalytic activity than that of TiCl4 in the preparation of sydiopolystyrene(Tab. 1), especially, it can be used to prepare a styrene rich poly(styrene-co-ethylene), the resulted poly(styrene-co-ethylene) is a crystalline polymer show a Tm (248℃) which is much lower than that of a homo syndiopolystyrene.
Fig. 2 Structure of the polymer catalyst Based on the results both of the experiment and the molecular simulation, we can give a conclusion that the polymer backbone stabilized the central metal Ti and make it difficulty of the Titanium to be reduced to a TiⅡ complexes, and the later shows no activity in the polymerisation.
[2] D W Guo, X Z Yang, L Yang, et al: Journal of Polymer Science: Part A: Polymer Chemistry.

Results and discussion Crystal structures.
NaLiAB is triclinic structure with a space group of P-1, completely different from NaAB.
The structure of NaMgAB is similar to NaAB, and both of them are orthorhombic structure.
Chemistry of Materials, 2009, 21(11): 2315-2318
Journal of computational chemistry, 2011, 32(8): 1734-1742.

It is a kind of polymer foam material with rigid structures and has the following good qualities [1-6]: (1) Completely closed and isotropic pore structures, and the pore diameter distribution is uniform; (2) Excellent mechanical properties and dimensional stability, low density ratio, under the same density, PMI foam has the highest compression, tensile and shear modulus and strength; (3) Higher heat distortion temperature (up to 220℃).
PMI foam is the rigid structure foam plastic which has the best heat resistance property; (4) Easy to process.
Through this method and using different ratios of raw materials, PMI foams which densities ranged from 50kg/m³ to 110kg/m³ were obtained in Institute of Chemistry, CAS.
Thank National Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese academy of Sciences for providing samples of PMI foams.
Feasibility study of PMI foam material’s application in the spacecraft structure, Spacecraft Environment Engineering, 2010 (2) [3] C.H.

Modified reduced graphene oxide with enhanced solubility and conductivity and its application Zeng Xiaopeng School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Which indicates that the sample of f-RGO-500 have a better crystal structure.
The better crystal structure of f-RGO-500 is further confirmed by Raman spectrum.
The better crystal structure of f-RGO-500 is helpful for the transmission of charge carrier.
Paredes, et al.: The Journal of Physical Chemistry C, vol. 114 (2010) no. 14, p. 6426-6432

Synthesis and properties of hyperbranched dispersant for high concentration of CWS Jinxu Dai 1, a, Guanghua Zhang2,b and Wenjing Han2,c 1School of Economics ＆ Management，Northwest University of Politics ＆ Law, Xi’an 710063, China 2Key laboratory of Auxiliary Chemistry & technology for Chemical Industry, Ministry of Education.
The structure of products were identified by IR spectra and 1HNMR spectra.
The hyperbranched dispersant molecular has a quasi-spherical structure which can be beneficial to reduce the apparent viscosity.
The structure of products was identified by IR spectra and 1HNMR spectra, and the structure of synthetic compound is the design molecular.
Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 38(2000), p. 2505 [6] Gan C, Yan D.

The aim of this overview is to highlight the contribution that materials chemistry has made to the development of CGO as an electrolyte. 1.
Wet chemistry-based routes have been developed to synthesize ultra-fine and even nano-sized oxide powders.
Eyring (Eds.), Handbook on the Physics and Chemistry of Rare Earths, North Holland, Amsterdam, Vol 3, 1979, pp. 401−524
Eyring (Eds.), Handbook on the Physics and Chemistry of Rare Earths, North Holland, Amsterdam, Vol 3, 1979, pp. 337−399. 337−399
Ivas, Cerium-gadolinium-cobalt oxide: Phase equilibria and defect chemistry in bulk and grain boundaries, PhD Thesis, ETH Zurich, 2013

Combustion synthesis of nanocrystalline Y2O2S: Eu3+, Mg2+, Ti4+ red long-lasting phosphors using mixture fuel of thiourea and citric acid Xiao-bao Han1,a, Xiang-guo Li1,b, Gui-hua Peng1,c, Zhen-hua Liang1,d, Xia Wang1,e 1State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin, Guangxi, 541004, China a313457758@qq.com, blixiangguo0317@163.com, cpengguihua164@163.com, dliangzh@mailbox.gxnu.edu.cn, e409145367@qq.com Keywords: Y2O2S, Nanomaterials, Luminescence, Phosphor, Combustion synthesis.
The structure, morphology and luminescent properties of these phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL).
The experimental results revealed that the phosphor was composed of sheet-shaped Y2O2S with hexagonal crystal structure.
Y2O2S possess a hexagonal crystal structure in P3m1 (164) space group with unit cell dimensions a=0.378 nm and c=0.6589 nm, in which the point symmetry of the yttrium site being C3v (3m) [8].

Accounting for the term of dietary fibre (DF) as the sum of cell wall carbohydrate. 3.2 Functional properties Functional properties are related to the chemical structure of the mushroom polysaccharides.
Effect of particle sizes on functional properties of dietary fibre prepared from sugarcane bagasse, Food Chemistry. 80 (2003) 221-229
Isolation and characterization of polysaccharides of kikurgae fruit body of Auricularia Auricula-judae, Agricultural Biology and Chemistry. 42 (1978) 417-422
Cell wall chemistry, morphogenesis and taxonomy of fungi.
Compositional studies on edible tropical species of mushrooms, Food Chemistry. 54(1995) 265-268

Introduction It is well known that the positron annihilation spectroscopy is used as a method for studying local structure of matter at a nanometer scale.
Physical Chemistry, v. 2012, Article ID 431962, 2012. doi:10.1155/2012/431962 [5] S.V.
Mogensen Positron annihilation in chemistry (Springer Ser. in Chemical Physics, v.58).
Pikaev “The Solvated Electron in Radiation Chemistry” I.P.S.T. 1971 [13] A.K.
Pikaev “The Solvated Electron in Radiation Chemistry” I.P.S.T. 1971.