Advanced Materials Research Vols. 1033-1034

Abstract: In this paper, a new diimine ligand of 2-(anthracen-9-yl)-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline(D1) and its corresponding Cu^I complex contain Bis[2-(diphenylphosphino)phenyl]ether were synthesized and characterized by ¹H NMR successfully. Experimental data confirm that Complex [Cu(D1)(DPEphos)](PF₆) is high-energy-emitting one. The broad band emission upon excitation at λ = 400 nm with the emission maximum locates at λ = 579 nm was observed. This makes them potential candidates as cheap emitting materials.

Abstract: Organic light-emitting materials D1~D3 containing triphenylamine donors, bipyridine acceptors and olefinic linkers were synthesized and characterized. The optical, electrochemical properties of materials were studied by UV-Vis spectra, fluorescence emission spectra and cyclic voltammetry method. The results show that the maximal absorption peaks of three compounds are in the range of 404nm~408nm and fluorescence emission peaks at the region of 534nm~557nm in dichloromethane solutions, respectively. Cyclic voltammetry measurement showed that these compounds had HOMO energy level in the range of-5.02eV~-5.16eV, which is proper for hole injection. The properties indicate that these compounds have potential for the application as light-emitting materials or hole-transporting materials.

Abstract: The water-soluble ZnSe:Ag quantum dots were synthesized in aqueous medium by chemical co-precipitation method with L-cysteine as surface modifier. The crystal structure and optical properties of the obtained ZnSe:Ag quantum dots have been characterized by X-ray power diffraction, infrared spectrum, UV-Vis absorption spectrum and photoluminescence spectrum. Results indicate that ZnSe:Ag quantum dots belong to the cubic blende structure and have good fluorescent characteristics. The L-cysteine modified on the surface of ZnSe:Ag quantum dots renders the quantum dots water-soluble, biocompatible.

Abstract: Low-voltage (1.5 V) InGaZnO (IGZO) thin-film transistors (TFTs) gated by the SiO₂ proton conducting films were self-assembled by a gradient shadow mask in sputtered self-assembled IGZO channel process. The IGZO TFTs have a high-performance with a large current on/off ratio of ≥1.2×10⁶, a low subthreshold swing of ≤120 mV/decade and a high field-effect mobility of 2.2 ~ 6.9 cm²/V·s. Threshold voltage is tuned by various thicknesses of IGZO channel. Both depletion mode and enhancement mode on the same chip is obtained, which will implement a direct-coupled field-effect transistor logic circuit. Our results demonstrate that the IGZO TFTs are promising logic circuit candidates for portable low-voltage oxide-based devices.

Abstract: The crystalline structure of lepidolite is introduced in this paper, its application in lithium ion battery is paid attention. Because of the extraction difficulties from brines in China, it is necessary to take advantage of lepidolite resources, driven by the huge economic benefit and social benefit requirements. The components and particle size distributions of lipodilites in Yichun and Yifeng are experimentally analyzed.

Abstract: Cement, phosphorus slag, silica sand, fly ash and water reducing agent were well-mixed, and then stirred with polypropylene fiber and water for preparation of phosphorus slag mortar. Performance of the mortar was tested according to relevant standards. The results showed that polypropylene fiber can improve flexural strength and tensile bond strength of the mortar. However the polypropylene fiber has little contribution to the compressive strength of the mortar. Fluidity of phosphorus slag mortar reduces with length of the fiber increasing. Polypropylene fibers distributed evenly in the phosphorus slag mortar can obstruct generation and propagation of micro cracks, thus crack-control property of mortar can be improved. When polypropylene fiber’s length and content are 10 mm and 4 g (by weight) respectively, the properties of phosphorus slag mortar are as follow: fluidity 209 mm, tensile bond strength 0.71 MPa, flexural strength 4.32 MPa, Compressive strength 10.83 MPa, and ratio of compressive strength to flexural strength 2.51 on 28 days.

Abstract: Analyzed and calculated the energy savings of heat reflective coatings applied on multi-storied residential buildings and high-risen commercial buildings in Beijing. Some advices about the application of heat reflective coatings in northern cold region are given. Energy saving effect was evaluated with the building energy simulation in winter and summer while the heat reflective coating is applied on the surface of residential buildings and commercial buildings. Calculating results showed that the energy saving is the most optimal to the multi-storied buildings when the cool roof coatings is coated on the roofs and the glass heat reflective coating is applied on east and west windows. With the high-risen commercial building, the energy saving is noticeable when the glass curtain wall is coated with glass heat reflective coatings. The energy saving rate can reach a maximum of 13%.

Abstract: New biodegradable Fe-Zn alloys with different concentration of zinc were prepared by electroforming in this paper. The composition, phase and microstructure of the Fe-Zn alloys were investigated by EDX, XRD and SEM, respectively. The potentiodynamic polarization and static immersion test were used to evaluate the in vitro biodegradation properties of these alloys. The results revealed that the alloys consist of single-phase Fe-Zn solid solution and have a better degradation property than pure iron, which make it a potential material used for bioabsorbable endovascular stent.

Abstract: Heat vulcanized silicon rubber was prepared by mixing technology. The influences of factors on silicon rubber performance were investigated such as raw rubber dosage, thermal-resistant additive dosage and process conditions. The results show that the optimal formula is as follows: 28.8phr raw rubber containing 0.23 vinyl group, 0.4phr white carbon black dispersant, 10phr vapor white carbon black, 0.5phr iron oxide, 0.7phr zinc oxide, 0.99phr thermal-resistant additive, 0.4phr accelerator DM and 0.6phr benzoyl peroxide. After placed for 24h, the mixture underwent two-step vulcanization (127°C×10.0MPa×6min and 200°C×4h). The thermal-resistant performance of silicon rubber was dramatically improved by thermal-resistant additive.

Abstract: Here, we developed single crystalline Cu@C nanowires with fivefold twinned structure via a facile hydrothermal method. In situ uniaxial tension tests of these NWs performed in transmission electron microscopy chamber reveal the ultrahigh strength (as much as 6.2 GPa) accompanied by favorable ductility (elongation>15%). The excellent performances benefit from nanoscale dimensions, unique penta-twinned geometry and good crystalline quality with protection of carbon shells. The study also provides direct experimental evidence for the theoretical modeling on the deformation mechanisms of metallic nanowires that have appeared in recent years. We expect that these findings can open a new window for applications in micro-or nanoelectromechanical devices where superior mechanical performances are desirable.