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The adsorption mechanism examined by FTIR analysis indicates that the carboxylate groups in Di-7N is absorbed on the surface of nano-TiO2 particles and the adsorbed structure is proposed to be bidentate chelating.
If there is C=O character in the spectrum and Δυadsorbed is greater than Δυpolymer in solution, then the adsorbed structure is monodentate; If there is no C=O character in the spectrum and Δυadsorbed is similar to Δυpolymer in solution, then the adsorbed structure is bidentate bridging; If there is no C=O character in the spectrum and Δυadsorbed one is smaller than Δυpolymer in solution, then the adsorbed structure is bidentate chelating [15, 16].
Thus, the adsorbed structure of Di-7N is confirmed to be the bidentate chelating.
Its chain structure could inhibit the agglomeration of the TiO2 particles as steric hindrance[16].
The adsorbed structure on nano-TiO2 surface is bidentate chelating.

Emial: yonghongh2003@yahoo.com.cn Keywords: microbial profile modification, oil reservoirs after polymer flooding, 16S rDNA, gene clone library Abstract To gain a better understanding of the mechanism and technology of microbial enhanced oil recovery, microbial community structure and diversity of reservoirs after polymer flooding in Daqing oil field at the Earlier Stage of microbial profile modification were studied. 16S rDNA gene clone library was used to assess the structure and diversity of microbial community.
She et al[9] revealed microbial community structure of reservoirs by PCR-DGGE analysis of water samples in Xinjiang Karamay oil field.
Then, we analyzed microbial community structure and diversity of the stage by 16S rDNA gene clone library.
Fig. 1 Phylogenetic trees of 16S rDNA gene sequences and their most similar sequences to GenBank Fig. 2 The genus of library's dominant bacterium Microbial community structure has undergone great changes for the impact of exploitation by the polymer flooding.
Zhang: Chemistry & Bioengineering.

Slag particles dissolved on the surface and formed network-like structures after being corroded.
The network-like structures exfoliated gradually from the surface with the development of hydration, as Z.L.
Mehta: High-Performance, High-Volume Fly Ash Concrete for Building Sustainable and Durable Structures[M].
Taylor: Chemistry of Cement Hydration.
Proc 8th Int Congress in the Chemistry of Cement, 1986(1), pp. 82-110

Thus, this paper is to discuss the influence of technological parameters on the nucleation and structure of Cu-W thin film.
Results and Discussion Results The structure of prepared Cu-W thin film should have been measured by small-angle X-ray diffraction.
This indicates the absence of crystal-structure tungsten in the thin film and the appearance of crystal-structure copper.
It indicates crystal defects and lattice distortionin the crystal-structure copper.
Lin, Materials Chemistry and Physics.

Synthesis and Evaluation of Starch Graft Copolymer Applied as Dispersant in Coal-Water Slurry Junguo LI a, Fang ZHAOb, Guanghua ZHANGc, Junfeng ZHUd and Long LIUe Key laboratory of Auxiliary Chemistry & Technology for Chemical Industry Ministry of Education, Shaanxi University of Science & Technology, Xi’an 710021, China aemail: lijunguo@sust.edu.cn; bemail: 526822350@qq.com; cemail: zhanggh@sust.edu.cn; demail: zjfeng123123@163.com; eemail: 631207567@qq.com Keywords: Starch; Coal-water Slurry; Dispersant; Apparent viscosity Abstract.
Chemical structure and thermal performance of the copolymer were investigated by Fourier Transform Infrared Spectrum (FT-IR) and Thermogravimetric Analyzer (TGA).
Based on the above, the starch-based dispersant has due structure and a bright prospect for the application for CWS.
All of the above results demonstrate that the copolymer has the due structure.
At coal concentration of 66 wt%, starch-based dispersant dosage of 0.4 wt% and shear rate of 100 s-1, CWS gives the minimum viscosity of 848 mPa • s. the starch-based dispersant is suitable to be applied in the Shenhua coal-water slurry and meets the needs of low viscosity and fine static stability, which attributes to the peculiar structure of the dispersant.

Research on Cementing Performances of Environment-friendly Backfilling Cementation Material Based on Blast Furnace Slag Shugang Hua,Xianjun Lub,Haili Niu c and Lei Zhangd College of Chemistry and Environmental Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Economic and Technical Development Zone, Qingdao, Shandong Province, P.R.China. 266590 ahusg8921@163.com, bluxianjun@vip.sina.com, cnhl004@163.com, dzll-186186@163.com Keywords: Blast furnace slag.
It has high potential activity for its glassy structure, so its use to prepare new filling cementation material is possible.
Blast-furnace slag is a glassy structure material with high potential activity for being high temperature smelted, so it can be used as base material of cementing material preparation.
Moranville-Regourd: Lea’s Chemistry of Cement and Concrete Ed.

At that, we studied the effect of using different gel temperature to influence nano-fibrous PLLA scaffolds’ structure and performance.
Therefore, gel temperature is an important element to control the formation of nano-fibrous structure.
When the gel temperature at -20˚C to -10˚C which would gain the scaffolds with excellent connected network structure (figure 1(d, e, f)).
The lower gel temperature could make for the formation of nano-fibrous network structure.
a b In addition, with the loss of the gel temperature fibers diameter would decrease, the nano-fibrous network structure more uniform.

Carbothermal synthesis of Cr3C2-WC-Ni nanocomposite powders Yongzhong Jin1, 2, a, Faming Ye1,b, Xianguang Zeng1,c, Ruisong Yang1,d 1Department of Materials and Chemistry Engineering, Sichuan University of Science and Engineering, Zigong 643000, P.
Especially, there is a change of the crystalline structure for (Cr, W)3C2 phase from 750 °C to 800 °C.
In other words, the remaining W atoms must dissolve into the crystal structure of Cr3C2 phase and form (Cr, W)3C2 solid solution.
At 800 °C for 2 h (in Fig. 1d), there are still only two kinds of phases, namely (Cr, W)3C2 and Ni solid solution, but the crystalline structure of (Cr, W)3C2 phase changes.
(Cr, W)3C2 phase obtained at lower temperature of 750 °C has an orthorhombic structure (Space group of Cmcm (63), lattice constant of 2.85×9.25×6.96, PDF 35-0804), and yet another orthorhombic structure (Space group of Pnam (62), lattice constant of 5.528×11.488×2.829, PDF 65-0897) is at 800 °C.

Various reasons of physics and chemistries, such as standing under load, bearing the heat and being subjected to the corrosion can cause all kinds of changes in physical or chemical state, like structure changes, state changes and composition changes.
Just in the recent year, many damage models for the damaged process of the clay structure, loess structure were put forward [4-8], but there are also some basic problems that need be considered.
Anthoine: Int J Solids and Structures vol. 32(1995), P137 [8] J G Wang, C F Leung: Computers and Geotechnics vol. 27(2002), P384 0 200 400 600 800 1000 0.0 0.2 0.4 0.6 0.8 1.0 damage ratio p/kPa damage ratio 0 200 400 600 800 1000 0.00 0.05 0.10 0.15 0.20 0.25 0.30 volumetric strain p/kPa total damage natural Fig.4 The stress-strain relation comparison (total means admixture, natural mean idea natural soil, and damage means completely damaged soil) Fig.3 Development of damage varible

Introduction Conducting polymers with micro-nano structures have attracted much attention owing to their unique properties and potential applications in various electronic devices.
However, PPy with special nanowires/bundles structure synthesized in SDS aqueous solution was described in this paper which may further influence the conducting property of the PPy.
SDS is an anionic surfactant and its molecules will self-assemble into aggregates such as micelles, vesicles and lamellar structures in an aqueous solution above the critical micelle concentration (CMC), and the morphology of micelles is closely related with the concentration of surfactant.
The weak peak around 2924 cm-1 is attributed to the stretching vibration mode of the methylene of the surfactant structure Fig.1 SEM images of PPy (a. sample1; b. sample2; c. sample3; d. sample4) Fig. 2 FT-IR spectra of the PPy (a. sample1; b. sample2; c. sample3; d. sample4) Fig.3 XRD spectra of PPy (a. sample1 ; b. sample2; c. sample4). 2θ=10°- 80° and is not found in Fig. 2a.
Liu; Journal of Physical Chemistry B, Vol. 110 (2006) No.3, p.1158