Advanced Materials Research Vol. 1081

Abstract: Numerical simulation has been carried out to investigate water separation from emulsion with new equipment designed by ourselves. Three rotate speed of 300r/min,1500r/min,3000r/min have been calculated using Reynolds stress model ,which is at the same water volume fraction, droplet diameter and other physical parameters .When the rotate speed increase, the velocity and pressure drop of fluid tends to increase. Due to the effect of centrifugal field, the water volume fraction of near the wall is larger than that of inner fluid. Because of the gravity, the water volume fraction of bottom is larger than that of upper.

Abstract: Smell-Seeing Sensor Array consists of two parts. One concerns a sensitive arrays, and the other deals with image collecting and processing technologies. In this paper, a 2×2 sensor array is made by the metalloporphyrin (CuTPP、ZnTPP、NiTPP) and zinc phthalocyanine (ZnPC). Exposed in vapor of 14 different kinds of VOCs (Volatile Organic Compounds) at room temperature, the array appears color change. ARM-Linux system and OpenCV are used to collect and process the color change. This system could detect 14 kinds of VOCs, achieving visualization of gas sensor detection, and laying a foundation of further qualitative identification of VOCs.

Abstract: The oxygenated feed-water treatment technology of supercritical unit can effectively decrease the corrosion of water-steam system, and thus the steam-water quality and the operating efficiency are greatly promoted. In view of the mode of feed-water treatment for supercritical unit, the characteristics of oxide film in thermal system under AVT and OT conditions are compared; and then, the principle of oxygenated feed-water treatment technology was elaborated. Besides, the oxygenated conditions, controlling of water quality, advantages, the relation between the formation of oxide scale and oxygen plus are analyzed and discussed. Finally, the paper introduced weak oxiding feed-water treatment technology for supercritical unit, with the principle of low oxygen and high pH value.

Abstract: This research adopts the pancreatin hydrolysis of silk fibroin active peptide, evaluate the antioxidant activity of hydrolysates. In the process of hydrolysis of silk fibroin, by measuring the amino nitrogen content of neutral formaldehyde titration method. Find the amino nitrogen content gradually stabilized at around 0.37g/L, and superoxide free radical scavenging rate changing with time fluctuation trend, superoxide free radical scavenging rate to a maximum of 65.03% at 220min.The use of silk fibroin hydrolysis process optimization,reaction time 160min, enzyme concentration4% , substrate concentration 20mg/ml, pH 8, temperature 38°C. The hydrolysis process under the hydrolysate on superoxide radical scavenging rate of 72.73%. The scavenging rate of hydroxyl radical is 47.24%. Red blood cell hemolysis induced by H₂O₂ inhibition rate was 24.30%.

Abstract: Direct molecule dynamics (MD) simulations have also been performed to study heterogeneous nucleation and growth of iron on C₆₀ molecule. The grown mechanism of this crystallization process was explored. The results indicate that 92 iron atoms attach to C₆₀ molecule surface can form new covalent bond, forming a closed regular icosahedron. More atoms grow in layer to form bigger regular closed clathrate base on the structure of former one. As increase of atoms number, there will appear some crystal faces.

Abstract: In order to search effect of osmotic medium on quality of tilapia fillets treated by different kinds of osmotic solution, the changes in pH value, lightness (L*) degree and electrical conductivity (EC) were quantitatively determined during osmotic treatments for fresh tilapia fillets with the osmotic medium (sodium chloride, sucrose),medium concentration (10-30%) and osmotic time (1-5hour) as the independent treatment factors. Results were as follows: (1) L* and pH of the fish fillets were decreased gradually, color darkened slightly, and EC was increased with increase in osmotic time when fresh tilapia fillets were soaked in sodium chloride (NaCl) solution and sucrose solution, respectively. (2)Effects of two kinds of osmotic media on quality of fish fillets were different during osmotic treatment period. First, the changes in pH, L* and EC of fish fillets were bigger in the NaCl solution, and smaller changes in the sucrose solution. Second, pH of fish fillets in the NaCl solution was always lower than that of sucrose solution, but EC of fish fillets in the NaCl solution was significantly higher than that of sucrose solution.(3)Highly significant correlation of EC and osmotic time were observed, and the regression equations were established according to the results of influence on EC of fish fillets in the process of osmotic dehydration.

Abstract: We design a new near-infrared plasmonic nanofocusing lens for far field practical applications by using nanonoble metal structure. The constructively interference of near-infrared cylindrical surface plasmon launched by the subwavelength metallic structure can form a subdiffraction-limited focus, which is modulated by the dielectric grating from the near field to the far field. The principle of designing such a far-field nanofocusing lens is elucidated in details. The numerical simulations demonstrated that nanoscale focal spot with full width of half maximum (0.43λ) can be obtained in far field with depth of focus about 2.86λ. This design method paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical measurement, and sensing.

Abstract: Giving a bimodal grain size distribution in nanocrystalline materials can effectively achieve both high strength and high ductility. Here we propose a theoretical model to study the failure behavior of nc materials with bimodal grain size distribution. The dependence of failure properties on grain size distribution were calculated. Numerical results show the strength and ductility of bimodal nanocrystalline materials are sensitive to grain size and the volume fraction of coarse grains.

Abstract: The polymer-laced Cu-ZnO nanoparticles were successfully synthesized by one-pot non-aqueous nanoemulsion method with the use of PEO-PPO-PEO as the surfactant, C₁₄H₂₉CH(OH)CH₂OH as the reducing agent, octyl ether as the solvent, Zn (acac)₂ and Cu (acac)₂ as precursors. The Morphology and structure of nanoparticles were analyzed by transmission electron microscopy (TEM) and X-ray diffraction (XRD). UV-visible absorption spectroscopy (UV-vis) and photoluminescence spectrometry (PL) were employed to valuate the optical properties of the nanoparticles. The Cu-ZnO nanoparticles with well defined optical properties are promising for optical, catalytic and biomedical applications.

Abstract: Dispersion of carbon nanotubes in water largely determines the excellent properties of carbon nanotubes can be fully exhibited in the composite material. Summarizes the characteristics of all kinds of surface active agent, select several can represent various types of surfactant reagents to test and comparing the several kinds of surfactants on the dispersion of carbon nanotubes, and focus on the effects of polyvinylpyrrolidone special molecular structure on the surface of the carbon nanotubes.