Search results

Properties of Waterborne Polyurethanes: Effect of NCO/OH Ratio Yongbin Jiu1, 2, a, Xinmiao Zeng1, b, Junhui Ji2, c, Yu Zhai1, d and Liancai Wang1, e 1 Beijing Radiation Application Research Centre, Beijing Academy of Science and Technology, 100012, China. 2 Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 102206, China.
The structure of the WPUs was studied by FT-IR.

The crystalline structure of the heat-treated samples was studied with Scanning electron microscopy (SEM) to explain the resultant of contamination that causes the densification.
Materials Chemistry and Physics, 2001. 67(1-3): p. 17-24.

Dardavila3,c 1,2,3 National Technical University of Athens, School of Chemical Engineering, Laboratory of General Chemistry, 9, Iroon Polytechniou Str., Zografou Campus 15 780, Greece a dinak@chemeng.ntua.gr, bdelig_ioanna@hotmail.com, cmirtodar@teemail.gr Keywords: metal matrix composite electrocoatings, pulse electrolysis, nickel, TiO2, ZrO2, particles incorporation, Vickers microhardness.
The synergetic action of both the pulse application and the simultaneous codeposition of the two different types of particles on the structure, the morphological characteristics and the microhardness of the composite electrocoatings, were studied.
The structure is relatively microcrystalline and the particles seem to be dispersed homogeneously in the nickel matrix.
One can observe that, under these electrolysis parameters, the structure of the deposit is dramatically changed and the nickel crystallites are oriented towards the more inhibited mode crystal growth, the [211] axis.
On the other hand, the relatively low roughness of the Ni/TiO2 -ZrO2 composite electrocoatings seems to correlate with their microcrystalline structure while their corrosion resistance is characterized as particularly sufficient.

The results showed that the layer structures of laminated composites remained consecutiveness with 93% deformation.
Pt-based high temperature structure materials have great demand in the fields of modern industry, national defense technology and new and high technology because of they have high melting point, good thermal stability, antioxidant and corrosion-resistance.
The microlaminate structure (thickness of 100nm-1mm) is on the basis of natural shell structure with bionics design, and its principle is that: minimize the sensitivity of the material mechanical properties on the original crack defects by minimize layer spacing and multiple interface effect to make materials develop into a kind of materials that are not sensitive to defects [1].
PtTi0.5Zr0.2 Element Wt% At% TiK 38.20 71.57 PtL 61.80 28.43 Matrix Correction ZAF Ti Fig. 2 SEM/EDS analysis of PtTi0.5Zr0.2/Ti laminated composite interface (93% cold-rolled). 50 μm A Ti PtTi0.5Zr0.2 B C D Evolution of layer structure during rolling process.
The effect of processing variables on the structure and chemistry of Ti-aluminide based LMCS, Mat.

As the defect of each point of the silica sample is diverse, and the lasers focus point by point, the sample block were divided into three-dimensional structure for each laser-point to discuss the relationship between the LIDT of each points and the OH-content in this paper.
During the former research,we study the relationship between the laser damage character and the fusing atmosphere or the heat treatment process to detect the different structure of different treatment process with different LIDT.
The structure is incomplete the same at the vertical and horizontal direction of each bulk.
The fell-down ofthe micro-structure lead to the losing of the chemistry stability, the OH-content is not the key factor of the LIDT-valuewhile it can influence on the accumulation of the point-lacuna[8].
Conclusion The structure and content of OH among the fused silica is different point by point, to find out the relationship between the OH and LIDT of each laser focusing point and the solution is effective for application especially for the parallel laser system.

Alexandrescu2 1 Romanian Academy, Institute of Physical Chemistry "Ilie Murgulescu", Splaiul Independentei 202, Bucharest, Romania 2 METAV - Research and Development, C.
All layers were formed by diffusion with reaction and present two zones with different structures and compositions and therefore different properties.
Coatings of different thicknesses but with the same structure were obtained by varying the working temperature and diffusion time.
Examination of the secondary electron images reveals uniform but different structures in the outer as well as inner layers, Figures 4 (a-c).
This compound exhibits a cubic with centered faces crystalline structure with a network parameter a = 11.369 Å, according to ASTM 04009-8176 file.

Structure Characterization and Hydrophilic Property of S+Ce Co-doped TiO2 Nanocomposite Film Difa Xu1,a, Haibo Wang2, b, Xiangchao Zhang1,c, Shiying Zhang1,d 1 Institute of New Materials, Department of Biological and Environmental Science,Changsha University, Changsha,410022, China 2 Institute of Technology East China Jiao Tong University, Nanchang Economic and Technical Development Zone,Nanchang, 330100 China a xudifa@ccsu.cn, bwhbcsu@126.com, ccsuzxc@126.com, d cdzhangshiying@163.com Keywords: Titanium dioxide (TiO2), thin film, photocatalysis, dope, hydrophilic Abstract.
The crystalline structure, surface morphology and surface chemical composition of the S+Ce co-doped TiO2 nanocomposite film had been primarily investigated by XPS, AFM and UV-vis analysis technologies.
L.Huisman, A.Reller, Photoinduced reactivity of titanium dioxide, Progress in Solid State Chemistry, 32 (2004) 33-177 [4] H.
Nie, Semiconductor nanocrystals: structure, properties, and band gap engineering, Accounts of Chemical Research,43 (2010) 190-200.

Hydrothermal Synthesis of Hydroxyapatite Urchins and its Drug Release Property Lixia Yang1, a, Quanwen Liu1, b, Tao Liang1, c, Jiajun Yin2, d, Laifen Qin1, e, Yingying Tang1, f and Xiangpeng Jiang1, g 1School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China 2Yantaishan Hospital, Yantai, 264001, China ayanglx2003@163.com, bldu_lqw@163.com, cliangtao1964@163.com, d690974864@qq.com, eqlaifen@163.com, fqingcheng218@sina.com, gjiangxp_2007@126.com Keywords: hydroxyapatite; morphology; hydrothermal method; drug release Abstract.
The hierarchically structured HAP microspheres were explored as drug carriers.
Each urchin-like structure consisted of a number of ribbons with width in size of several hundred nanometers and lengths ranging from 2 to 5μm.
Some of the nanowhiskers have assembled into one structure, which suggests that the assembly of nanowhiskers is not yet complete.

Department of Chemistry, Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, PR China 2.
Moreover, microwave heating preserved the porous structure of the regenerated AC more efficiently than treatment in a conventional device [5].
The reason may be that higher power or long time treatment by microwave irradiation resulted in a very high temperature at the circumstance and this could break down the bond structure of the zeolite and cause pore collapse.
The structure of dye can be destroyed by microwave irradiation.

China 2State Key Lab of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.
Introduction In recent years, with multidisciplinary relevancy and rapid development of functional materials science, design, synthesis and exploitation of rare earth organic luminescent complex with a novel structure and composition will possess theoretic significance and application value [1,2].
In previous works, we synthesized the rare earth ternary luminescence complex Tb(III)-H2L-1,10-phen and characterized its composition, morphologies, structure, and the luminescent properties by element analyses, FTIR, FE-SEM, XRD, TG-DTA, and PL spectra.
The structure of the complex was measured by a RIGAKU D/max-II B X-ray diffractometer (XRD) using Cu Kα radiation (λ = 0.1542 nm).