Advanced Materials Research Vols. 1061-1062

Abstract: One-dimensional orthorhombic NaNbO₃ long rods were successfully prepared by combining a traditional hydrothermal method with the post-heat treatment. In the hydrothermal reaction process, sandia octahedral molecular sieves (SOMS) were synthesized at 160°C using Nb₂O₅ and NaOH as the initial reactants. Then, the effects of different post-heat treatment conditions on the morphology and crystallinity of product were investigated. Results showed that post-heat temperature could promote the crystal of the product to form orthorhombic NaNbO₃, and the axis of the long rod ran along the [001] direction of NaNbO₃ orthorhombic unit cell. Our study may provide a new approach for the preparation and investigation of one-dimensional alkali niobate photocatalytic materials and template grain for textured alkali niobium.

Abstract: A self-developed differentiated UHMWPE fiber preparation technology and surface modification technology are applied in developing UD cloth preparation process in order to produce uniform and stabilized fiber. By screening thermoplastic elastics, a hybrid elastic matrix resin system is developed to improve the inter-facial bonding properties and anti-aging properties between the fiber and matrix resin. An organic/inorganic hybrid approach is opted to develop nanoenhanced hybrid elastic matrix resin in order to form a physical network which can pass shock load.

Abstract: With the miniaturization of the NEMS/MEMS, the size effect becomes significant in the nanochannels/nanopores through which fluid flows as well as the interface effect. By all-atom molecular dynamics (MD) simulations, the ion transportation is investigated in nanopores as well as the physical properties at solid-liquid interface. To describe the anion and cation distributions of NaCl solution in vicinity of graphene nanopores, a new MD model was developed, taking thermal vibration of wall atoms, the structure of solvent molecules and ion sizes into consideration. The main peak locations of ion distributions stayed unchanged by changing the nanopore size, the solution concentration and the electric field strength. The ionic currents increased linearly with the diameter and the electric field strength, while it increased non-linearly with the solution concentration.

Abstract: Cu (In,Ga)Se₂ (CIGS) thin films were prepared by direct magnetron sputtering CIGS quaternary target at the substrate temperature varying from room temperature (RT) to 300 °C. The effects of substrate temperature on the structural and electrical properties of CIGS films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and Hall effect measurement. The CIGS thin films with a chalcopyrite structure were obtained between 100 and 300 °C and the crystallinity of films were enhanced with the increase of the substrate temperature from 100 to 300 °C. The film compositions were consisted with the target when the substrate temperatures were between RT and 200 °C, however, it deviated from the stoichiometry of the target when the substrate temperature was 300 °C. The CIGS films deposited at 200 °C had the higher carrier mobility of 3.522 cm²/Vs.

Abstract: The behavior of foam sandwich composites subjected to the quasi-static load has been investigated. The results revealed that the indenter tip shapes have an influence on the indentation behavior of the specimens. Failure modes were studied by sectioning the samples at the damage location and observing under an optical microscope. The primary damage mode was found to be the fiber breakage, delamination and foam crack. Knowledge of the damage resistance properties of a sandwich panel is useful for product development and material selection.

Abstract: To study the effect of Angelica keiskei chalcone (AC) on microvessel density (MVD) and vascular endothelial growth factor (VEGF) expression on mice hepatocarcinoma cells. Fifty mice were inoculated with hepatocarcinoma H22 cells and divided into 5 groups. Group one to three were administered orally with AC by 5, 25 and 50 mg/kg/d, respectively. Group four was given Endostar 4mg/kg/d by intraperitoneal injection and tumor control group (group five) was given with normal saline. All mice were sacrificed after 10 days. The proliferation activity of hepatocarcinoma cells was determined by methy tetrazolium (MTT) assay, and the levels of the MVD and VEGF protein expression were detected by immunohistochemistry method. The AC inhibitory rates for tumor size were 4.20%, 30.47% and 39.42% at AC treatment dose of 5, 25, and 50 mg/kg, respectively. The average MVD count was 14.2, 11.2 and 8.5 at treatment dose of 5 mg/kg, 25 mg/kg and 50 mg/kg AC, respectively. The protein levels of VEGF in mice treated with 25 mg/kg and 50 mg/kg AC were significantly decreased. The results showed that AC could inhibit tumor angiogenesis effectively and the inhibition mechanism might be associated with the down-regulation of VEGF.

Abstract: Combined with author's rich construction experience in water supply and sewerage works, analyzes and explores the background of energy-saving materials in water supply and sewerage works, dissects the situation of China's current energy-saving materials applied to the water supply and sewerage works, and forecasts the direction of the future development of new energy-saving materials.

Abstract: A modified YSZ thermal barrier coating (TBC) was prepared by simultaneously depositing two components, NiCrAlY and YSZ, on nicked-based superalloy DZ125 via atmospheric plasma spraying. In this study, the sodium salt was deposited on substrate surface. After being heated at 950°C for 50min, the specimens were cooled to ambient temperature within 10 min. The specimens were recoated after each 10 cycles. Subsequently, the corrosion products were analyzed via X-Ray diffraction and SEM. The results indicated that deterioration of YSZ coating mainly resulted from generation of chemical interaction. Conversely, abnormal growth of TGO and enrichment of molten salt around segmentation crack were not observed in the modified YSZ thermal barrier coating. Moreover, the modified YSZ-TBC exhibited higher thermal resistance than traditional YSZ-TBC in the thermal cycling testing.

Abstract: The effects of beeswax, palmitic acid and stearic acid on properties of soybean protein-isolate/carboxymethyl cellulose composite films were compared. The palmitic acid leaded to a higher tensile strength, water vapor barrier and oxygen barrier of composite films than the beeswax and stearic acid. However, the palmitic acid lowered the elongation at break and leaded to a slight yellow. Hence, the palmitic acid was a better option to improve the tensile strength and water vapor barrier of soybean protein-isolate/carboxymethyl cellulose composite films.

Abstract: Four activated carbons (ACs) with different properties were heat-treated at 600 °Cfor 3 h and the ACs before and after the treatment were characterized by nitrogen adsorption and XPS. The relationship between pore texture, surface chemistry and dibenzothiophene adsorption capacity was investigated. It is found that pore volume for the pore below 1nm and between 1.1-1.6 nm decreases and increases respectively, and mesopore volume increases after the heat treatment. The Brunauer- Emmett-Teller (BET) surface areas of the four samples remain almost the same after the treatment. The surface oxygen content decreases after the treatment. The adsorption isotherms can be better fitted by Freundlich equation than Langmuir equation, indicating that the adsorption sites on surface of the ACs is inhomogeneous. The dibenzothiophene adsorption capacity has a linear relationship with the pore volume of the pores in the range of 0.536-1.179 nm, indicating that micropore filling of dibenzothiophene is the dominant mechanism for dibenzothiophene adsorption. The adsorption capacity of dibenzothiophene for the pristine ACs is larger than that of the heat-treated ACs under the same pore volume for the pores in the range of 0.536-1.179 nm, indicating that surface oxygen functional groups favors the adsorption for dibenzothiophene.