Chemical Engineering and Material Properties III

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Authors: Zhong Fang, Tao Dong, Yong He, Yan Su
Abstract: This paper focus on the Oxygen plasma surface treatment affect on the bonding strength. In shearing force tests , total 10 samples were tested. Through the shear force tests, it indicates that moderate exposure to O2 plasma could increase the bonding strength to some extent. Then the AFM tests results shows that the MR-I 9100M coating topography is about 14 nm, while after Oxygen plasma treatment the topograhy decrease to 7.9 nm. And the MR-I 9150M coating topography is about 5.5 nm, while after Oxygen plasma treatment the topograhy decrease to 4.6 nm. By AFM tests, it can be found that the Oxygen plasma surface treatment cause the decrease of the surface roughness. And it puts forward another possible explanation for the Oxygen plasma treatment can improve the bonding strength.
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Authors: Li Yun Ge, Shu Juan Li, Chang Rong Zhao, Huan Huan Deng
Abstract: Extracellular polymeric substances (EPS) in marine algae- Platymonas subcordiformis affected by enrofloxacin (ENR), the typical quinolone antibiotics released to the environment through different ways, was studied. A 3-dimension EEM (excitation –emission matrix) fluorescence spectroscopy was used to examine the interaction between EPS and ENR, and the fluorescent peaks A and B were detected, whose fluorescence intensity remarkably decreased with the increased ENR concentration. It was demonstrated that the interaction of EPS with ENR well fitted the modified Stern-Volmer. It was concluded that the presence of EPS in marine algae affected the transport and transform of antibiotics in aquatic environment.
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Authors: Jie Liu, Ji Ding Li, Xiao Long Lu
Abstract: In this study, PVDF membranes were prepared by solution-cast method. The effects of evaporation temperature on the morphology, polymorph and mechanical properties of such prepared membranes were studied. It was found that perfect spherulites were observed in the solution-cast membranes. FESEM photomicrographs of the membranes showed dense structure. PVDF mainly crystallized into α phase. In the solution-cast process, the spherulite size increased as evaporation temperature was increased from 120 °C to 150 °C, when the evaporation temperature was 165 °C, spherulite size decreased. And the tensile strength increased with the decrease in spherulite size.
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Authors: Bo Tao Lin, Dong Mei Shi, Tao Li, Sen Kuan Meng
Abstract: TiO2 photocatalytic technology was developed in the past two decades in air treatment because of good photocatalytic effect, non-toxic, chemical stability, low cost, reusable features, the effect use of solar energy. A new composite materials of visible light photocatalytic degradation of low concentration of volatile organic compounds were produced by use of combining the adsorbent with TiO2 photocatalytic technology.The adsorbent can enrich concentrations of volatile organic compounds on the surface of the TiO2 photocatalyst. In this paper,the mechanism of the combined adsorption-photocatalysis for the removal of volatile organic compounds and immobilization methods、principle、craft were reviewed.The characteristic of the immobilization methods was analysed.It laid the foundation for the optimizing of the immobilization methods and the improving of the photocatalytic efficiency.
540
Authors: Jun Ma, Yong Zhong Jia, Yan Jing, Chao Zhang, Ying Yao, Jin He Sun
Abstract: In this paper, phase equilibrium of Li+, Mg2+∥Cl-, SiO32--H2O system at 220°C was researched. The solid phases were characterized by X-ray diffraction (XRD). Lithium silicate, hectorite, karpinskite and magnesium hydroxide were observed as solid phases. According to the analysis of XRD, the phase diagram was obtained. The phase diagram could be used as the theoretical principle for synthesis of hectorite.
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Authors: Xiao Dong Liu, Dong Dong Meng, Xu Guang Zheng, Xing Liang Xu, Sen Gao
Abstract: The low temperature Raman spectroscopic (4000-95 cm–1) investigation on the hydroxyl cobalt chloride Co2(OH)3Cl and deuteroxyl cobalt chloride Co2(OD)3Cl polycrystalline samples has been performed from the room temperature down to 4 K closing to the liquid Helium temperature. Lineshapes of Raman mode Eg (about 130 cm–1 assigned to the normal symmetrically bending vibration mode of the [ClCo3] group for both kinds of samples) are found to be apparently asymmetric Fano lineshapes when the temperatures are below 230 K. This phenomenon is preliminarily attributed to the effect of electron-phonon coupling and a continuum of electronic states centered at about 16 meV with an upper limit 18.5 meV is suggested in this report.
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Authors: Xiao Dong Liu, Sen Gao, Dong Dong Meng, Xu Guang Zheng, Xing Liang Xu
Abstract: Factor group analysis on the deformed pyrochlore-structure hydroxyl transition metal halides M2(OH)3X (M = Co, Fe and Mn; X = Cl, Br and I) with the crystal symmetry ≡ D3d5 of space group No. 166 for their infrared (IR) and Raman spectroscopic studies are, for the fist time to the best of our knowledge, reported. Through a standard factor group analysis, we predict that there are 17 IR active normal modes (7A2u+ 10Eu) and 12 Raman active modes (5A1g + 7Eg), caused by five atomic site groups [HOM3], [OM3], [MO4X2], [ClM3] and [MO6], where the black body letters represent the site atoms. In addition we figure out all the atomic displacement patterns of 12 Raman active normal modes, and point out these results are completely same as those of the famous geometric frustration material Herbertsmithite ZnCu3(OH)6Cl2.
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Authors: Zi Xin Guo
Abstract: Calcined Mg/Al layered double hydroxide is called CLDH for short. It is one of lamellar compound which has been wildly applied in water treatment. Its structure is relatively complex and has a strong adsorption capacity for the fluoride in water. The basic structure is the charge-layered structure with memory function. This paper introduces the theory of partial differential equation into CLDH dynamic adsorption model and establishes partial differential equation of adsorption stress of CLDH and analyses experimental data through Matlab algorithm. In order to validate the validity and reliability of dynamic model and Matlab algorithm, this paper roasts LDH through experiments and obtains CLDH fluoride-adsorption capacity curves with different PH values ​​and different calcination temperature which provides a theoretical basis for the study of the ability of CLDH to remove fluoride ion in water.
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Authors: Ren Yu Guo
Abstract: At present, transportation of the oil and gas resources in our country relies mainly on long-distance buried pipeline; pipe is commonly steel spiral welded pipe. The long-distance pipeline adopts buried way, crossing section of the complex terrain. Different soil properties, and soil have different degree and strong corrosion to the pipe, and the leakage point also is not easy to be found in time, as well as the underground pipeline maintenance needs a large number of earthwork, more hard than the construction of new line. Therefore, long-term, safe and steady operation is the main task of long-distance pipeline. How to prevent the corrosion of buried pipeline damage has long been an important part of pipeline engineering.
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Authors: Chun Hui Niu, Yong Lv, Xiao Ying Li, Qing Shan Chen
Abstract: For producing RGB tricolor luminescence, three kinds of components of rare-earth ions is chosen, which are Er3+ doping, Er3+-Yb3+ co-doping and Tm3+-Yb3+ co-doping, respectively. Three kinds of rare-earth doped up-conversion fluoride material are prepared based on high temperature solid-state method. Under being excited by 980nm laser, three materials emit red, green and blue light, whose peak wavelengths are 660nm, 550nm and 480nm, respectively. Through analysis of luminescence process, it can be concluded that red and green luminescence are belong to two-photon absorption transversion, and blue luminescence is three-photon absorption transversion.
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