Advanced Materials Research Vols. 79-82

Abstract: Phenolic-latex film is used to coat on fiberglass surface to protect and supply fiberglass an intensive and adhesive coating for reinforcing fiber/rubber composite purpose. A series of p-alkylphenol was introduced to modify the hydrophobicity of resorcinol- formalin-latex (RFL) film surface and to prepare a p-alkylphenol-resorcinol-formalin-latex (ARFL) film, which alkyl carbon number was 1, 4, 9, 12, respectively. The surface characteristic of ARFL films was evaluated by Fourier transform spectra (FTIR) and contact angle and X-ray photoelectron spectroscopy (XPS) analysis. The surface micrograph of fiberglass pulled from H-sample was observed by scanning electron microscope (SEM). The best hydrophobicity was obtained on the nonylphenol-resorcinol- formalin-latex (NRFL) film. A better adhesion was gained for NRFL coated fiberglass comparing to RFL one. The effect of temperature and humidity on the tensile property of coated fiberglass was also discussed. The shelf life of NRFL-coated fiberglass was prolonged to six weeks under hot and humidity weather. The discussed coating may be popularized to other fiber surface to lower the effect of moisture.

Abstract: It focused on how the low carbon steel surface was pretreated by hydrolyzed KH-560 silane solution and the polyethylene (PE) coatings were prepared on the pretreated surface in the paper. Moreover, the comparison of the adhesive strengths of PE coatings has been made between the coating and the steel substrate surfaces pretreated by silane agents and other various conventional pretreatment methods. The results show that the highest adhesive strength between coatings and steel surface could be acquired on the condition that the concentration of KH-560 was about 5% and the hydrolytic time was 48 hours, and the adhesive strength of coatings coated on the steel substrate surfaces pretreated by silane agents was more or less higher than those pretreated by conventional processes such as sandpaper grinding, acid etching, phosphating and sandblasting by 40.3%, 46%, 17.6% and 13.2%, respectively. The fracture morphology of the coatings coated on silane agent pretreated substrate surface showed cohesive failure, which was also different from the ones coated on the conventional process pretreated substrate surfaces.

Abstract: In this study, the Taguchi method was used to optimize the preparation of titanium dioxide thin film reactor through modified chemical vapor deposition (CVD) method and then conversion ratio of toluene was evaluated at the optimal condition. The results indicated that optimal condition for preparation of TiO2 thin film reactor was as followings: water bath temperature of 80°C, Ti (OC3H7)4 / H2O ratio of 4, carrier gas flow rate of 1000 mL min-1, catalytic oxidation temperature of 400°C, oxidation time of 8 hrs, calcination temperature of 450°C, spraying speed of 30 rpm and furnace linear motion geared motor speed of 75 cm min-1. The conversion ratio of 56.56 ppmv toluene could be achieved up to 99.8% with the irradiation intensity of 3.76μW cm-2 at the flow rate of 300 mL min-1 after 120 minutes.

Abstract: Nano-sized TiO2/V2O5 bilayer coatings were prepared on type304 stainless steel substrate by sol-gel method and were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD). The performance of photocathode protection of the coating was investigated by the electrochemical method. SEM results indicate that the coating surface is continuous, uniform and dense, XRD spectra show that the coating is of anatase TiO2 and V2O5. The experimental results demonstrate that type 304 stainless steel with the bilayer coating can maintain cathode protection for 6h in the dark after irradiation by UV illumination for 1 h.

Abstract: A series of Ag films with different thicknesses were prepared on polyethylene terephthalate (PET) substrates under identical conditions by thermal evaporation. The effect of the thickness on the optical and electrical properties of the films was studied. The morphology of the samples was investigated by atomic force microscopy (AFM). The optical and electrical properties were measured by spectrophotometer and four-point probe method, respectively. The experimental results show that the reflectance increases, while transmittance and resistivity decrease with the increase of the thickness. There exists a critical thickness of the film and it is 75 nm in this experiment. The optical and electrical properties of Ag films on PET substrates with thickness larger than critical thickness, are close to those of the conventional bulk silver. The resistivity of the 150-nm film is 3.0±0.2 μΩ•cm, which is lower than that of the 250-nm Ag film grown on BK-7 glass substrates.

Abstract: As concerning the high toxicity of organotin paints, the need to develop new environment-friendly antifouling agents has been highlighted. The paper mainly focused on the synthesis of siloxane-acrylic resin and its antifouling performance. The antifouling properties of resins were carried through by the colonization of benthic diatoms (Nitzschia flosterium) and ocean plates of offshore platform. The paper also disclosed that the silicone oil (5.5%, w/w) introduced to siloxane-acrylic resin was significant positive effect for enhancing the antifouling performance in Qingdao ocean.

Abstract: Sulfonated-polyethersulfone/TiO2 (SPES/TiO2) nanoparticle composites with different TiO2 content were prepared by a sol-gel process. These composites have nanosized TiO2 rich domains well dispersed within SPES matrix observed by SEM photograph. The effect of TiO2 nanoparticles on the hydrophilicity of SPES was discussed by contact angle goniometer. The mechanism of the hydrophilicity improvement of these composites was analyzed by the molecular interaction theory and FT-IR. The hydrogen bond and coordination bond between SPES and TiO2 nanoparticle were observed. Comparing with the pure SPES, the SPES/TiO2 composites exhibited an outstanding increase in hydrophilicity.

Abstract: A novel antibacterial material was prepared by electrospining polyurethane (PU) containing TiO2-Ag nanoparticles in this study. The average diameter of PU electrospun nanofibers decreased with increasing concentration of TiO2-Ag.These nanofibers membrane showed high antibacterial activities against Staphylococcus aureus and Escherichia coli, respectively. The mixed mode of PU electrospun fibers and TiO2-Ag nanoparticles was a physical form. The addition of TiO2-Ag did not affect the mechanical property of the mat much.

Abstract: Amorphous silica coating was deposited on the surface of Ni by dip-coating processing from commercial silica sol. Isothermal oxidation of the coated and uncoated specimens at 973 K to 1173 K in air was conducted to investigate the effect of the silica coating on the oxidation behavior of Ni by TGA, SEM and XRD. Results of the oxidation tests showed that the oxidation rate of Ni was reduced greatly due to the applied thin film. The possible mechanism of the effect of thin film on the oxidation of Ni was discussed.

Abstract: The present paper reports the experimental results for the displacement instabilities occurring near the surface grooves of substrate of Fecralloy material in thermal barrier coatings (TBCs). Two groups of groove with different orientations were carved on the surfaces of specimens. The specimen were then mounted on micro-creep tester and subjected to thermo-mechanical cycling for various holding temperatures and tensile stresses. The result shows that the displacement instability near the horizontal groove decreases significantly as the tensile stress increases, while that near the vertical groove increases with the tensile stress. The higher temperature can cause bigger displacement instability for vertical and horizontal grooves. It is also found that the addition of the yttrium into the substrate considerably improves the interface roughness leading to smaller displacement instability compared to that without yttrium doped.