Advanced Materials Research Vols. 538-541

Abstract: The antifungal PVA film was fabricated by addition of the clove oil/β-cyclodextrin inclusion complex into PVA, which is acted as the basic packaging material. The mechanical properties, oxygen permeability and the bacteriostatic action of the film varied with the additional amount of inclusion complex. The tensile strength of PVA film decreased with the addition of inclusion complex and the effect is little when the amount was less than 25%. Adding less than 25% had no obviously effect on oxygen permeability of the film. It proved that pure PVA films have no antibacterial property and the growth of aspergillus was inhibited in different degrees when the content was different. The growth range of aspergillus is smaller and the bacteriostatic action to aspergillus is increased with the increase of inclusion complex amount of agent. The inhibitory zone appeared when the inclusion complex amount was more than 20%.

Abstract: We reported the preparation of surface modified poly (ethylene oxide terephthalate) - poly (butylene terephthalate) membrane by the method of silk fibroin anchoring, namely SF/(PEOT/PBT). Its surface properties were characterized by contact angles and XPS and the biocompatibility of the composite membrane was further evaluated by human salivary epithelial cells (HSG cells) growth in vitro. Results revealed that SF/(PEOT/PBT) possessed the low water contact angle (48.0±3.0°) and immobilized a great amount of fibroin (fibroin surface coverage: 26.39 wt%), which attributed to the formation of polar groups such as hydrosulfide group, sulfonic group, carboxyl and carbonyl ones in the process of SO2 plasma treatment. HSG cells growth in vitro indicated that the silk fibroin anchoring could significantly enhance the biocompatibility of PEOT/PBT membrane, which suggested the potential application of fibroin anchoring PEOT/PBT for clinical HSG cells transplantation in the artificial salivary gland construct.

Abstract: N-type Bi2Te3 and p-type Sb2Te3 thermoelectric thin films have been prepared by RF and DC co-sputtering. The Seebeck coefficient of n-type Bi2Te3 and p-type Sb2Te3 thin films is about -122 μVK-1 and 108 μVK-1, the power factor is about 0.82×10-3 Wm-1K-2 and 1.60×10-3 Wm-1K-2. Then, the films have been selected to fabricate the thin film thermoelectric generator. The results show that the open-circuit voltage of 12.2 mV and the output power of 3.32 μW are obtained for a thin film generator with the temperature difference at 60 K.

Abstract: Biaxially textured CeO2 films were deposited on Ni–5at.%W (Ni–5W) tapes by a metal-organic deposition (MOD) method. Subsequent YBa2Cu3O7-y (YBCO) films were prepared using the (MOD) method leading to a simplified coated conductor architecture of YBCO/CeO2/Ni–5W. X-ray diffraction measurements revealed an epitaxial growth of the CeO2 buffer layer the 7.06°, 5.16°, for the out-of-plane and in-plane alignment, respectively. The superconducting coated film with a texture spread down to the out-of-plane texture is ω = 6.2° and the in-plane texture is φ = 7.6°. The results indicate that single CeO2-buffered Ni–5W tapes are suitable for the epitaxial growth of YBCO higher cube texture and the epitaxial YBCO film was obtained. To microstructural investigations, the film’s SEM results showed a dense, smooth and crack-free surface morphology. The superconducting properties were measured by four probe method. The superconducting transition temperature (Tc) was about 90 K with a narrow transition of 0.8 K and the critical current density (Jc) was about 1.5×104 A/cm2 at 77 K, 4T.

Abstract: In his paper, polylactic acid ultra- thin fibers membrane carried rifampicin were prepared by electrospinning technology, and release experiment of polylactic acid super thin fiber membrane with rifampicin were carried out in PBS solution. The resulted ultra-fine fibers membrane of polylactic acid membrane were characterized through scanning electron microscopy to decided the morphology, the results showed that the drug-loaded polylactic acid membrane contained microfiber in a range of 1μm-8μm in diameter; polylactic acid fiber diameter distribution was affected by molecular weight of polylactic acid, concentration of polylactic acid, quantity of drug loaded and spinning parameters such as voltage, the average fiber diameter increased when improved the mass fraction of PLA solution, the diameter of PLA ultra-fine fibers loaded rifampicin was thiner than PLA ultra-fine fibers. The performance of controlled release in phosphate buffer solution (PBS) was detected by UV, and their delivery rate was calculated by the detected result. The sustained release effect of polylactic acid Molecular with weight of 150,000 loaded rifampicin was better than polylactic acid ultra-fine fibers with the molecular weight of 100,000, the addition of lipase can improve release rate of rifampicin.

Abstract: An environment-friendly pre-film for carbon steel was obtained by using seawater with cerium salt. The influencing factors of cerium salt pre-film were discussed through orthogonal experiments, and the optimum processing parameters were confirmed. Then morphology, composition, the forming process and corrosion resistance of the pre-film were investigated. Analysis by digital microscope showed that the cerium salt pre-film was a blue uniform coating. EDS images displayed that the pre-film consisted of Ce, O and Fe, the major component of the protective layer was a mixture of Ce oxide, Ce hydroxide and Fe hydroxide. The results of electrochemical potentiodynamic polarization and gravimetric measurements indicated that the cerium salt pre-film provided effective protection to the substrate of carbon steel.

Abstract: Pure Bi0.9La0.1Fe1-xScxO3 (x = 0, 0.05, 0.10, 0.15, 0.20) (BLFSO) thin films were deposited on conductive indium tin oxide (ITO)/glass substrates through a simple sol-gel process. The effect of Sc doping on the XRD, microstructure, dielectric and ferroelectric properties of BLFO films was studied. Compared to counterparts of Bi0.9La0.1FeO3 (BLFO) film, the grain refinement of all films is obvious. When the value of Sc is 0.15, the double remanent polarization 2Pr is effectively enhanced with the extreme value of 17.7µC/cm2. The dielectric constant exhibits a trends of increase firstly and then decrease with the increase amount of scandium level.

Abstract: The stress change of membrane flapping-wing aerial vehicle that used Moon-Rivlin model was calculated in one flapping cycle. One flapping cycle was divided into twelve segments, aerodynamic force and inertia force in each segment were calculated, the stress distribution could be gotten. The results show that: at the beginning of upstroke and at the beginning of downstroke, the stress of flapping-wing is maximum; the stress of downstroke near the flapping symmetry position is minimum, and the stress of upstroke near flapping symmetry position is another minimum peak stage.

Abstract: CdS thin film was deposited onto glass substrates by the chemical bath deposition. The deposition temperature was maintained at 75 °C. The crystal structure, surface morphology, optical and electrical properties have investigated employing X-ray diffraction (XRD), scanning electron microscopy (SEM), spectrophotometer and seeback coefficient measurement, respectively. The XRD reveals CdS thin film grown at 75 °C has the mixed hexagonal and cubic structure. The optical band gap energy is 2.4 eV. The seeback coefficient is 197.3μV/k at room temperature. The electric resistivity of CdS thin film is in the order of 10000Ω•cm.

Abstract: Poly (3, 4-ethylenedioxythiophene) (PEDT) has attracted a great deal of interest during the last decades. PEDOT was popular with many applications such as antistatic coating, the hole injection layer in OLED. The thermal stability of PEDOT is important in these applications. In this study, PEDOT films were prepared by oxidative polymerization on the substrate polyimide (PI) films. Matrix polymer poly (vinyl prrrolidone) (PVP), Monomer 3, 4-ethylenedioxythiophene), retardant were dissolved in solvent as monomer solution; The Iron (III) p-toluenesulfonate hexahydrate (FTS) was used as oxidant solution. To investigate the heating properties of PEDOT films, the content of PVP, oxidant FTS, retardant were varied. The influence of treatment current density was also studied. Thickness of the PEDOT film was measured by Alpha-step surface profiler and the surface resistivity was measured by multimeter.