Search results

Synthesis and Characterization of Nanosize Molybdenum Disulfide Particles by Quick Homogeneous Precipitation Method Kunhong HU 1, 2, a, Xianguo HU 1, a, Xiaojun SUN 3, Hefeng JING 1 and Song ZHAN 1 1 School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China 2 Department of Chemistry and Materials Engineering, Hefei University, Hefei 230022, China 3 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China a xghu@hfut.edu.cn Keywords: Quick homogenous precipitation method; Molybdenum disulfide, MoS2 nanoparticles.
The lattice structures of the products were characterized by JEM-2010 high-resolution transmission electron microscopy (HRTEM).
The typical MoS2 lamellar structure was observed in the two micrographs.
There were more aberrations of the lamellar a b 200nm 250nm structure in Fig. 5a than that in Fig. 5b.

The structure and morphology after elaboration were checked by a grazing incidence angle X-ray diffraction (XRD model: Philips X'PERT PROMPD) and Scanning electron microscopy (ESEM, XR 30).
It can be seen that, for the films prepared at this temperature, only a single diffraction peak corresponding to (110) rutile structure SnO2 reflection is observed.
The micrograph shows a nanometric structure of the sample. 14 16 18 20 22 24 26 28 30 32 0 10 20 30 40 50 60 Intensity (a, u,) 2 θ (110) Fig 2: X-ray diffraction patterns of SnO2 thin film deposited on glass substrate by sol-gel dip coating process annealed at 500°C Fig 3: SEM micrograph of SnO2 thin film deposited on silicon substrate by sol-gel dip coating process annealed at 400°C The reflectivity profiles obtained using NUR and V14 Reflectometers for SnO2 thin films on glass substrate and annealed at 300, 400 and 500 °C are shown in figures 4a, 4b and 4c respectively.
[12] Daoli Zhang, Liang Tao, Zhibing Deng, Jianbing Zhang, Liangyan Chen., Materials Chemistry and Physics 100 (2006) 275-280.

Synthesis, Photochromism Properties of A Hybrid Diarylethene Based on Hydroxyl Group Duohua Jiang, Weijun Liu, Shiqiang Cui, Gang Liu* Jiangxi Key Lab of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China liugang0926@163.com Keywords: Photochromism; Diarylethene; Fluorecence.
The photochromic process of diarylethenes is based on a reversible transformation between the open-ring isomer with a hexatriene structure and the closed-ring isomer with a cyclohexadiene structure, according to the Woodward-Hoffmann rule [7].
The structure of compound 1a was confirmed by 1H NMR. 1H NMR (400 MHz,CDCl3): δ (ppm): 1.95 (s, 3H, CH3), 1.99 (s, 3H, CH3), 6.86 (s, 1H, -thienyl), 6.88 (s, 1H, -thienyl), 7.16 (s, 1H, -phenyl), 7.35 (s,1H, -phenyl), 7.41 (s, 1H, -phenyl), 7.43 (s, 1H, -phenyl), 7.51 (d, 1H, J = 8.0 Hz, -phenyl), 7.55 (d, 1H, J = 7.8 Hz, -phenyl), 7.72 (d, 1H, J = 7.8 Hz, -phenyl), 7.77 (s, 1H, -phenyl).

The development of stable and sulphur tolerant anodes moves the research towards alternative materials among which some oxides with perovskite structure are gaining large attention due to their high electronic conductivity and chemical stability under reducing conditions [1].
On the other hand, for particles annealed at 1100°C the pure perovskite structure was confirmed (Fig. 4) and irregular-shape aggregates of sub-micrometric particles were observed (Fig. 3).
In spite of the multi-layer nature of the green laminate, an homogeneous structure was obtained in the sintered support and a high porosity was observed by SEM investigations (Fig. 5), as actually required for SOFC anodes.
Segadães: Journal of Material Chemistry, Vol. 9 (1999), pp. 2505-2510

With temperature increasing, solid solution of Dy2O3 and CeO2 transformed into Dy2Ce2O7 gradually before 1500°C, and pure Dy2Ce2O7 compound with fluorite structure has been formed up to 1500°C which can be seen from comparing XRD pattern of sample at 1500°C with standard spectrum of Dy2Ce2O7 plotted in Fig. 2.
The defect chemistry equation due to doping can be represented using the Kröger-Vink notation by the following equation.
This phenomenon indicates that the Dy2O3-CeO2 solid solution transform gradually into Dy2Ce2O7 with fluorite structure after 1400°C and this transformation procedure has been stopped before 1500°C.
According to the XRD pattern of sample at 1500°C, it can be concluded that pure Dy2Ce2O7 compound with fluorite structure can be obtained by sintering for a few hours at 1500°C using Dy2O3 and CeO2 as reactants.

Recently, a series of new progress has been made in the research of ionic liquid through combining material science, reaction design and environmental engineering with the areas of biomass[1], electroanalytical chemistry[2], the progress of separation[3], cellulose dissolution[4-5].
The smooth structure of original cellulose was destroyed.
The regeneration form ionic liquid led to changes in the morphology of cellulose structures, providing more accessibility for the attachment of enzyme active site, providing feasibility of enzyme immobilization with high loading amount.
Conclusions Dissolution and regeneration from ionic liquids could destroy the original regular structure of cellulose, which is a prerequisite of enzyme immobilization on the cellulose support matrices, since the regenerated cellulose carrier provides plenty active site for enzyme bonding.

Studies on the thermodynamic and the miscibility gap of the Cu2O-Al2O3-SiO2 pseudo-ternary system Qiuguo Xiaoa, Gangcheng Ding, Peng Long, Mingmin Zhang, Shaohua Shen School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, China.
But their structures are clearly different.
The second phase of Sample 2 possesses incompact flocculent structure (Fig.3a), but that of Sample 6 possesses compact core structure (Fig. 3b).

Baudin 2,d 1 : Department of Metallurgy, University of Biskra - B.P: 145 - Biskra - 07000 Algeria 2 : Laboratory of Physico-chemistry of Solid State - Building 410 University Paris-South, ICMMO, UMR CNRS 8182, 91405 Orsay Cedex- France a zidani.sabih@caramail.com , bzboumerzoug@yahoo.fr , cdenis.solas@lpces.u-psud.fr, dthierry.baudin@lpces.u-psud.fr Keywords: Deformation by wire drawing, recrystallization, texture, spheroidization of the pearlite.
Results and discussions The initial microstructure of as-received steel wire After hot rolling, the initial wire has a ferreto-perlitic structure (Fig. 1a), The ferritic grains are equiaxe with an average size of 10 µm.
The Pearlite has a lamellate structure (Fig. 1b).
- Wire drawing causes, after annealing, a phenomenon of spheroidization of the lamellar structure of the pearlite. .

The Direct Characterization for the Modified Filler by Oil Absorption Ratio Xiangyun Liu1,2,a, Xueyong Zhou2,b,*, Lili Qu2,c, Qicai Yao2,d, He Wang2,e 1College of chemistry and chemical Engineering, Tianjin University of Technology, Tianjin, China 300384 2Department of Food Science, Tianjin Agricultural University, Tianjin, China 300384 aemail: yunyun989796@126.com; bemail: zhouxueyongts@163.com; cemail: 568680036@qq.com; demail: yaoqicai858789@163.com; eemail: 512241667@qq.com * Corresponding author.
However, there is a big difference in structure between the inorganic fillers and polymers, resulting in a large interfacial tension and incompatibility in filling-complexes[4].
Chen, “The effect of crystallization pressure on macromolecular structure, phase evolution, and fracture resistance of nano-calcium carbonate-reinforced high density polyethylene”, Materials Science and Engineering, Vol 527, Issues 24-25, September 2010, pp. 6699-6713
Wang, “The influence of surface modification on the structure and properties of a calcium carbonate filled poly(ethylene terephthalate)”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol 389, Issues 1-3, September 2011, pp. 230-236

The oxide releases an oxygen atom to become two non-bridge oxygen atoms, which facilitate migration and diffusion of interstitial ions, and therefore lowers the strength of Si-O structure.
The colorless and transparent quartz grains are transformed to white or cloudy-white cristobalite grains that show a loose structure. whiteness up to 92.3%-96.7%.
Fig.1 Morphology of silica mine Fig.2 Morphology of processed silica Fig. 3 Morphology of cristobalite Results and Analysis Transformation rate can be calculated with whiteness test and XRD results by using the following formula[7]: (1) Cq and Ccr are contents of quartz and cristobalit (wt%); Iq and Icr are diffraction intensities of quartz and cristobalite on their (101) planes; Lcr/Lq is a constant (0.61) and can be calculated based on absorption coefficient, structure constant, and other parameters.
Summary Thanks support: National Natural Science Foundation of China (Grant: 40862003, 40672026), Guangxi Natural Science Foundation of China (Grant: 0542012, 05112001-2A5) References [1] K.Y.He, Silicate Physical-Chemistry[M] (1997),p.76