Advanced Materials Research Vols. 634-638

Abstract: In this study, the alternating conductive polymers based on phenothiazine and bithiophene unit, poly[(N-10-dodecyl-phenothiazin-3,7-ylene)-alt-(2,2’-bithiophen-5-yl)] (P1) and poly[(N-10- dodecyl-phenothiazin-3,7-ylene)-alt-(4,4’-didodecyl-2,2’-bithiophen-5-yl)] (P2), were synthesized by Suzuki coupling reaction in the presence of palladium catalyst. The structures of synthesized compounds were confirmed by 1H NMR. The optical, electrochemical properties of synthesized polymers were investigated by UV-Vis, cyclic voltammetry (CV). The optical band gap of 2.22 eV and 2.50 eV was obtained from absorption onset of UV-Vis spectrum. Then, the two devices using blends of the polymer, as a donor, and PC71BM, as an acceptor, were fabricated by spin-coating. The device with a P1:PC71BM (1:4, w/w) as an active layer exhibited the best performance with an open circuit voltage (VOC) of 0.68 V, short circuit current (JSC) of 3.5 mA/cm2, fill factor (FF) of 31.8 % and power conversion efficiency (PCE) of 0.74 %.

Abstract: The SiO₂ coated Al thin films deposited on glass substrate for solar front reflectors were designed using Essential Macleod Program (EMP) and successfully fabricated by magnetron sputtering. The obtained thin films showed high reflectivity (up to 89.51%) under the light wavelength ranged from 250 to 2500 nm, which was identical with calculated results. Moreover, the thin films showed high anti-corrosion properties after the harsh abrasion tests. The high performance of the thin films was mainly attributed to the SiO2 layer, which served as a good protection without serious degradation of reflectivity, demonstrating the bright prospects for outdoor solar front reflectors.

Abstract: Two β D-π-A porphyrin dyes have been synthesized and applied as photosensitizers for dye-sensitized solar cells. A maximum solar conversion efficiency of 2.2% has been achieved for dye 2-(N, N-diphenylaminophenylacetynyl)-12(13)-(4-carboxylphenylacetynyl)-5, 10, 15, 20-tetra (4-tert butylphenyl)porphyrin zinc.

Abstract: γ-MnOOH nanowires have been synthesized via a simple hydrothermal process without any template at relatively low temperature. The as-obtained sample was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the γ-MnOOH nanowires were investigated by cyclic voltammetry and galvanostatic charge-discharge methods. And a high specific capacitance calculated from the galvanostatic discharge curve was 191 F•g^-1 at the current density of 0.1 A•g^-1, which remain a good specific capacitance of 143 F•g^-1 at the current density of 1.0 A•g^-1. The electrochemical analysis results demonstrate that γ-MnOOH nanowires should be a good candidate as electrode material for supercapacitor.

Abstract: Two new π-conjugated polymers (Poly[(N-10’-(octan-3-yl)-phenothiazin-3,7-ylene)-alt- (4’,7’-bis(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PoPTZ-BT-BTD), Poly[(N-10`-(octan-3-yl) -phenothiazin-3,7-ylene)-alt-(4’,7’-bis(thiophen-2-yl)-5,6-bis(octyloxy)benzo[c][1,2,5]thiadiazole)] (PoPTZ-BT-BoBTD) ) were synthesized through the Suzuki coupling reaction for organic photovoltaics (OPVs), and their optical and electrochemical properties were analyzed. Their wavelength of maximun absorption was 526 nm and 506 nm in solution state, repectively, and 560 nm and 522 nm in film state, respectively. Their band-gap energy was 2.01 eV and 2.09 eV in solution state, and 1.82 eV and 1.91 eV in film state, respectively. The results of analysis of the chrateristics of photovoltaics, 0.79 % and 0.99 % of the maximum power conversion efficiencies (PCE), repectively.

Abstract: Steel tube confined concrete structure and FRP-confined concrete structure were researched and widely applied in structure engineering current years. Based on the advantage and disadvantage of the two types of structure, a new type of structure named FRP-steel composite pipe confined concrete is proposed. Moreover, the feasible and advantageous about the application of this new type in structure engineering is stated. The development prospects of this new type of structure are mentioned as well.

Abstract: Local material, mainly as wood, stone, brick, and tile is easy to get from the local area, and can reflect some regional characteristics. This paper classifies local material as pavement material, masonry material, and decoration material, which can be applied by trim, repair and transform technologies to the village environment and building remediation. In addition, this paper further analyses the function and usage of local material by case study.

Abstract: The forming background, properties and classification of eco-cement as well as it’s characteristics are systematically expatiated in this paper and the application and research progress of eco-cement in and abroad are introduced. The domestic research status of eco-cement and some presently existing problems are analyzed and discussed. It’s believed that there are good prospect of eco-cement in our country, much more attention should be paid on the problem which conclude security production, exhaust gas emission and environmental pollution control regulations of the eco-cement production. In the development of eco-cement industry, it’s necessary to consider the factors of environment and city construction for the industrial plan. Furthermore, the performance and application field of eco-cement still have to be improved.

Abstract: As the world's largest building materials production, the mechanical properties of concrete prominent and construction is simple, inexpensive features. Concrete production and construction sectors also exists a very serious problem of environmental pollution, people have to consider how to enhance the environmental protection of concrete, namely, the production and use of "green concrete". Since the past one-sided pursuit of high strength concrete, while ignoring the the durability issues brought a series of questions, allowing people to put forward the concept of a high-performance concrete. The paper by exploring the current development of high-performance green concrete, summary of the proposed method to achieve green high performance concrete.

Abstract: The effects of epoxy emulsion on the mechanical properties and water and chloride permeability of cement mortar and concrete were experimentally studied. The results show that adding epoxy emulsion will improve the flexural and tensile strengths at both early (7 d) and later (28 d) ages, and the 28 d compressive strength of cement mortar, though the compressive strength at 7d will be decreased a little. The suitable dosage of epoxy emulsion is 6~10% (solid content) based on the mass of the cement in mortar. The water and chloride permeability of cement mortar are also remarkable improved when 6~10%epoxy emulsion is added.