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Facile Preparation and Electrochemical Performances of LiMn2O4/Li1.2(Mn0.56Ni0.16Co0.08)O2 Blend Cathode Materials for Lithium Ion Battery Yun-long Zhou1,a, Zhi-biao Hu1, Chen-hao Zhao1, Li Yan2 and Kai-yu Liu1,2,b 1College of Chemistry and Materials Science, Longyan University, Longyan, 364000, China 2College of chemistry and chemical engineering, Central South University, Changsha, 410083, China azyl953026@163.com, bkaiyuliu@263.net Keywords: Lithium ion battery, LiMn2O4; Li1.2(Mn0.56Ni0.16Co0.08)O2, Blend cathode materials Abstract.
The influences of different mass ratios of two cathode materials on structures, morphologies and electrochemical performances are clearly discussed in the context.
The LiMn2O4 with clear edge and corner possesses the typical octahedral structure, and these octahedrons have the size of ~10 mm [14].
Materials Chemistry and Physics, 2008, 111: 213-217
Mn-Ni content-dependent structures and electrochemical behaviors of series Li1.2Ni0.13+xCo0.13Mn0.54-xO2 as lithium-ion battery cathodes.

The sample powders were characterized using X-Ray Diffraction (XRD) using Cu Kα radiation to identify their phase purity and crystallographic structure of the materials.
This indicated that the transition metal ions are successfully substituted in the LiCoO2 structure.
All the diffraction patterns of the materials show a highly crystalline structure with sharp peaks and high intensity.
Chemistry of Materials, 15 (2003) 4699–4702
Procedia Chemistry, 19 (2016) 861–864

The damage reasons of stone cultural relics are very complex and due to the comprehensive effect of physics, chemistry and biology, the purpose of this experiment is to research the breakage degree of stone cultural relics suffering from climate condition, environmental temperature, humidity, water, and so on, especially those surfaces engrave words or paintings.
Yungang stones: Thick grain feldspar sand stone, blocky structure, The broken bits content is 89%, pyramid and hypo-pyramid figure, grain bolster, broken bits composition, quartz is 64%, feldspar is 8%, mica is 2%, magnetic iron ore is 2%, garnet is 1%, rock crumb is 12%.
It can be explained by internal and external factors, influenced by water, temperature, chemistry component and structure strength in detail [3].
The stones materials are porous, its chemistry and physics weathering effects become more obvious, at the high temperature and humidity in the box, because of capillarity and infiltration, plenty of water is absorbed, and the structure of jello is destroyed.
Frozen water, congealed water go into the inner of stone through capillary, when the temperature change, the water may froze or melt, the internal stress will change, the volume will swell or contract, these can all cause structure destroy.

Theoretical chemical investigation and detonation characterization of AAOF and ACOF Biao Yan1,a, Hongyu Zhou2,b 1School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China 2School of Chemistry and Chemical Engineering, Longdong University, Gansu 745000, China adonghuhai123@163.com, bzhouhongyu23@163.com Keywords: AAOF, ACOF, theoretical chemical calculate, detonation characterization Abstract: 3-Amino-4-aminoximidofurazan (AAOF) and 3-Amino-4-chloroximidofurazan (ACOF) are important precursor of synthesizing new furazanon (furoxano) energetic compounds.
Their parameter was compared to deepen the study of structure-activity relationship.
Fig. 1 Molecular structure of AAOF and ACOF Experimental The theoretical chemical investigation.
According to crystal structure of AAOF [7], a crystal unit was selected as the initial structure of AAOF, remove coordinate data of N5 amido in the AAOF, increased coordinate data of chlorine as the initial structure of ACOF.
Song jirong (School of Chemistry and Chemical Engineering, northwest University, Xi’an, P.R.

This technique combined with the Rietveld method lets us to refine unit cell, determine crystallite size and microstrain in network, refine and determine crystal structures and preferred orientation.
In this method, the structural and instrumental parameters are refined and compared with calculated diffraction pattern based on the crystal structure, similarities between these two results in values similar to the parameters of real crystal structure of material [8].
This analysis is in accordance with the result obtained by structure refinement of WC particles with an average crystallite size of 20.8 nm as results were shown in Table 1.
Oyama: "Introduction to the chemistry of transition metal carbides and nitrides".
(ed), The Chemistry of Transition Metal Carbides and Nitrides, 1 ed, Chapter 1, Glasgow, UK, Blackie Academic & Professiona1996

It also retains the original structure and state of the material.
The particle size and the crystalline structure of the product samples were detected by means of X-ray analysis with a BD-86 diffractometer(Japan) and Mastersizer 2000 Laser grain-size analysis meter(England).
At the same time, there is no La3+ diffraction peak on the X-ray diffraction patterns, this indicates that La3+ has entered into the structure of TiO2.
Mixed Crystals.Chinese Journal of Inorganic Chemistry,2005,21 (3),437 [8]Twari P H.
Journal of Central South University of Forestry Technology,2006,26,(5),71 [11]J.Lin.J.C.Yu,An investigetion on photocatalytic activities of mixed–rare earth oxides for the oxidation of acetone in air.Journal of photochemistry and photobiology A:Chemistry 1998,116:63

Single-wall carbon nanotubes (SWCNTs) are rolled up structure of a single graphite layer whereas, multi-wall carbon nanotubes (MWCNTs) are concentric graphite layers rolled up into a layer-layer structure with interlayer spacings of 0.34 nm [2].
Finally, it is suggested that the grinding time of graphite adopted for CNTs production plays a primary role in structure quality of CNTs.
TrAC trends in analytical chemistry, 2006. 25(5): p. 480-489
Journal of Materials Chemistry, 2011. 21(40): p. 15872-15884
Takada, Topological and sp 3 defect structures in nanotubes.

Effects of calcining temperature and alkaline of solution on the structure and performance of HTLcs were studied.
Its structure has not yet been destroyed.
It has a columnar structure under optical microscop (Fig.6b).
Arabian Journal of Chemistry , 2015:1-15
ACS Sustainable Chemistry & Engineering , 2015 , 3 , 340-348.

Study the Effect of HAp Content in PLA/HAp Microsphere on the Efficiency of Drug (Clindamycin) Loading Process Juntima Pradid1,a, Wirunya Keawwattana1,b,Siree Tangbunsuk1,c 1Department of chemistry, Faculty of science, Kasetsart University, Bangkok 10900, Thailand aboom_foru@hotmail.com, bfsciwyk@ku.ac.th, csiree.t@ku.ac.th Keywords: Polylactic acid (PLA), Hydroxyapatite (HAp), Clindamycin, Drug loading Abstract.
An ultrasound field was applied to obtain Polylactic acid (PLA)/Hydroxyapatite (HAp) biocomposite microspheres with the specific core-shell structure to be applied as a carrier of a drug.
The aim of this work was to further develop the PLA/HAp biocomposite microsphere with the specific core-shell structure to be applied as a drug carrier.
Acknowledgements This work was financially supported by the Graduate School Kasetsart University, Thailand, Department of Chemistry, Faculty of Science, Kasetsart University, Thailand and The National Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials (NCE-PPAM), Kasetsart University, Thailand.

Research of preparation and ultraviolet shielding for nanometer powder of tin dioxide coated with zinc oxide Yuanrui Wang1,2a, Guojun Qiang1,b , Fengjuan Liu1,c 1 College of Chemical Engineering, Changchun University Of Technology , Changchun, 130012, PR China 2 College of Chemistry, Jilin University, Changchun,130023, PR China awyr@mail.ccut.edu.cn , bqiangjayjun@163.com, cliufengjuan289@163.com Keywords: UV shielding; SnO2 coated with ZnO ; homogeneous precipitation method ; nanometer powder Abstract: The preparation of tin dioxide coated with zinc oxide nanometer powder by factional homogeneous precipitation method is reported in this paper.
Fig.1 UV- shielding performance of Fig.2 XRD pattern of composite powder and composite powder and single powder single powder Fig.1 shows that tin dioxide coated with zinc oxide nanometer powder(S1) has better UV- shielding performance than single powder from pure nano-zinc oxide(S2) or pure nano-tin dioxide(S3).The potential reason is that the outer electronic structure of Zn2+ and Sn4+ is all full of 3d10,when SnO2 was coated with ZnO , electronic interaction by interface layer of coating will be increased.
The following characterizations demonstrate that the structure of prepared material is nanometer composite powder by coating. 3.2 XRD analysis Fig.2(a) shows XRD pattern of composite powder(S1) ,which is consistent with that of JCPDS card No. 005-0664.It indicates that the synthesized composite powder(S1) is crystallized and the diffraction peaks could be indexed to the hexagonal structure (space group p63mc,JCPDS card No. 005-0664).
[8] C.L.Kuo, C.L.Wang and H.H.Ko: Ceramics International Vol.36(2010),p.693- 698 [9] O.Acarbas, E.Suvacı and A.Dogan: Ceramics International Vol.33( 2007), p.537-542 [10] K.C.Song , Y.Kang: Materials Letters Vol.42(2000), p.283-289 [11] T.Wang, Z.N.Ma and F.Xu: Electrochemistry Communications Vol.5.(2003),p.599-602 [12] S.Li, X.L.Qiao and J.G.Chen:Journal of Crystal Growth Vol.289(2006),p.151-156 [13] H.Yang , S.D.Han and L.Wang: Materials Chemistry and Physics Vol.56(1998),p.153-156 [14] F.Davar , F.Mohandes and M.S.Niasari.: Polyhedron Vol.29(2010) , p.3132-3136 [15] C.Cobianu, C.Savaniu and O.Buiu: Sensors and Actuators B Vol.43(1997),p.114-120.