Advanced Materials Research Vol. 933

Abstract: Graphene/NR composite was prepared in emulsion blending and the multilayer graphene was about 4-8 layers. Different mass fraction of this kind of graphene was mixed into NR in this work.The thermal conductivity of this compositive system was respected to be improved apparently since the high thermal conductivity of graphene. In this work, TEM(Transmission electron microscope) was used to observe the structure and morphology of the multilayer graphene. NETZSCH LFA was used to research the change of thermal conductivity with the fraction of grahene changing. DSC(differential scanning calorimetry) was used to research the structure change in the series of composites. The TEM results showed that the graphene we used is 4-5 layers. LFA had proved that the multilayer graphene has affected the thermal conductivity of matrix greatly and DSC also provided evidence to support the same views.

Abstract: La₂Mo₂O₉ nanoparticles were synthesized successfully using Sol-gel process with (NH₄)₆Mo₇O₂₄·4H₂O, La (NO₃)₃·6H₂O and citric acid as original materials. The result shows that well-crystallized spherical La₂Mo₂O₉ nanoparticles were formed at 600°C with sizes of ca. 50~80 nm. The synthesized La₂Mo₂O₉ nanopartile were characterized by XRD, TEM and IR, respectively.

Abstract: The effect of V₂O₅ addition on the microstructures and the microwave dielectric properties of 0.9CaWO₄-0.1Mg₂SiO₄(9CWMS) ceramics prepared by conventional solid-state routes have been investigated. The V₂O₅ were selected as liquid phase sintering aids to lower the sintering temperature of 9CWMS ceramics. A small amount of V₂O₅ (0.25~1 wt%) were used for sintering aid and led to high densification at 1050°C. The dielectric properties of 9CWMS ceramics with V₂O₅ additions are strongly dependent on the densification, the microstructure. As the amount of V₂O₅ additives increased from 0.25 to 1.0 wt%, the dielectric constantsεrdecreased following the trend with density. The quality values Qdecreased with the increase of V₂O₅ amount for all sintering temperatures. The 0.25 wt% V₂O₅-doped 0.9CaWO₄-0.1Mg₂SiO₄ ceramicssintered at 1080°C for 2 h had the optimum dielectric properties: εr= 5.7; Q×f= 73000 (at 14 GHz).

Abstract: Mesostructured Fe-MCM-41 nanoparticles have been hydrothermally prepared for the first time with assistance of binary surfactants (CTAB and F127). The formation of nanoparticles consists of two steps, that is, the hydrolysis of silica precursor via catalysis by an acidic ferric salt, followed by facile assembly into mesostructured nanocomposites with cationic micelles by addition of condensation catalyst. In the hydroxylation of phenol with aqueous H₂O₂, Fe-MCM-41-NP displayed higher activity than a Fe-MCM-41 sample with normal particle size (Fe-MCM-41-LP).

Abstract: In this work, we well performed the silver nanoparticles (AgNPs) supported on rare earth oxides ,which La-doped nanoceria nanocomposites for the scavenging Hydroxyl radicals that used facile and readily synthesized strategy .The complex microstructure nanoparticles were characterized by High resolution transmission electron microsopy (HRTEM), Energy dispersive spectrometer (EDS), X-ray diffraction (XRD). This paper showed AgNPs were immobilized on an functionalized dual-rare earth oxides surface that have a potential in biomedicine like antioxidant, anti-inflammatory, antibacterial and anticancer on perspectives future.

Abstract: The effect of deformation temperature on microstructure, flow stress and corrosion resistance of 2205 duplex stainless steel was investigated at low strain rate of 0.005 s^-1. The flow curve analysis showed that the specimen was mainly characterized with dynamic recovery (DRV) at 850 °C, and the characteristic of dynamic recrystallization (DRX) was enhanced with deformation temperature increasing to 950 and 1050 °C, then flow curves presented steady state with characteristic of DRV at 1150 and 1250 °C. Microstructure analysis exhibited the austenite DRX at deformation temperatures of 1050 and 1150 °C. The specimens deformed at temperatures ranging from 850 to 1250 °C and strain rate of 0.005 s^-1presented active-transpassive behavior, indicating faster corrosion rate compared with the as-received, which can be attributed to more ferrite (δ) and austenite (γ) grain boundaries or δ/γ phase boundaries formation.

Abstract: According to the comprehensive utilization of 300 series and 400 series stainless steel dust (SSD), and the dephosphorization of the reclaimed Cr-Ni contained hot metal, an experimental method of smelting reduction in iron-bath and oxidational dephosphorization was studied. The result shows: The yield rate of Cr in 300 SSD and 400 SSD is 98.13% and 98.39% respectively, the yield rate of Ni is almost 100%; During the dephosphorization, through the BaO and CaO-BaO based dephosphorizer has a higher Dephosphorization rate, it can bring pollution problems and the cost is too high, however, under some circumstance when the requirement of phosphorus content is not critical, the CaO based dephosphorizer can also achieved the dephosphorization goal.

Abstract: The overlying free film method was used to study the nanoTiO₂ and UV absorbing agent modified water-borne acrylic varnish and polyurethane varnish of dyed veneer photochromic suppression effectiveness, using infrared spectrum analyzed the photochromic behavior of dyed veneer under different coated condition. Results showed that dyed veneer covered with UV modification film has the best light restraint, film modified by nanoTiO₂ takes second place, and unmodified film worst. Photochromic inhibitory rate of UV modified polyurethane and acrylic paint film were 56.37% and 33.59% respectively, the rate of nanoTiO₂ was 15.85% and 17.24%.

Abstract: Using the CIS (Configuration Interaction with Single Substitute) method, we calculated structure of cycloheptanone ion excited state and frequency of vibration. Comparison can be seen from the table 3, the path formed by the debris path C lowest energy structure, so the stable structure of C₄H₅O⁺ fragmentation can be shown in path C. It is the parent ion 1C-7C, 4C-5C fracture formation, one of 9H and 10H migration. 11H and 12H migrated from 3C to 4C, formed C₄H₅O⁺ fragmentation. It mainly through the fifth excited state occur the dissociation process.