Advanced Materials Research Vols. 807-809

Abstract: Acoustic emission (AE) testing (AET) is an effective, nondestructive testing (NDT) method which is widely used throughout the petrochemical industry. It especially plays an important role in inspecting of atmospheric storage tank floor corrosion, oil and gas pipeline leakage and pressure vessel cracking. The AET methods and evaluation of storage tank, pipeline, sphere and other equipment in oil and gas storage and transportation system are reviewed in this paper, and the development trends of AE technique also be introduced. This technique has important significance in ensuring the security.

Abstract: The energy consumption during the transportation can be reduced through avoiding transport the crude oil whose moisture content near the phase inversion point, but now, there are no scholar study the influence of various factors to the inversion phase point systematic. In this experiment ,we use HAAKE Viscotester 550 to study oil rheological and research that how temperature, shear rate, different kinds of viscosity reducer and different amount of it influence the phase inversion point systematically. The result shows that the rise of temperature or the shear rate can push the point forward. Different kinds of viscosity reducers have different effects at different temperatures, the more does the viscosity reducers added, the more forward it push the point, but when the amount of it reaches a certain degree, the phase inversion point not forward any more, so we should predict it through the experiment in advance. This experiment have filled the gaps in current phase inversion point research field.

Abstract: Microwave solvothermal technique was used to synthesize nanocrystalline _. This method is employed with much excellence such as celerity, economy, good purity and small granularity. Several techniques including XRD, TEM, EDS and XPS were used to characterize its composition. The mechanism of the formation of nanocrystalline was discussed. UV-Vis indicates that this compound is preferable semiconductor with a band gap of 2.27 eV.

Abstract: Two new Zn (II) coordination polymers with 3-nitrobenzoato ligands have been prepared, and their structures have been characterized by single-crystal X-ray diffraction techniques. The structure of [Zn (3-nbz)₂(μ-4,4'-bpy)]_n (1) (3-nbz = 3-nitrobenzoato, 4,4'-bpy = 4,4'-bipyridine) shows 1-D chains originating from terminal 3-nbz ligands and μ-4,4'-bpy molecules. The chains are further connected through face-to-face π stacking interactions to genenate a 2-D supramolecular layer. In Zn (3-nbz)₂(2,2'-bpy) (2) (2,2'-bpy = 2,2'-bipyridine), carboxylate groups exhibit chelated bidentate to give discrete mononuclear units, which are linked by face-to-face π-π and C-H···π interactions to produce a 1-D supramolecular chain.

Abstract: Heterogeneous catalytic ozonation for the degradation of p-chloronitrobenzene (pCNB) in aqueous soloution was investigated in presence of copper oxide (CuO) nanoparticles prepared by the precipitation method. The average diameter of CuO nanoparticles was 26.8nm, with a specific surface area of 10.2580m²/g and average pore diameter of 7.53nm. The presence of CuO nanoparticles in ozonation enhanced the degradation efficiency as compared to ozonation alone. Typical operating parameters like catalyst dosage, initial reaction temperature and initial pH exerted a positive influence on the pCNB degradation. Both tert-butyl alcohol test and spin-trapping/electron spin resonance (EPR) technique confirmed that the degradation of pCNB followed a radical-type mechanism during ozonation. Density functional theory (DFT) calculation indicated that an ozone molecule interacted with the surfaces of CuO nanoparticles where hydroxyl radicals (OH) were generated with a quantitative and qualitative discussion. Based on these observations, it was suggested that CuO nanoparticles accelerated the initiation of OH derived from the catalytic decomposition of ozone, resulting in the enhancement degradation of pCNB.

Abstract: In this paper, a novel fluorescent material with high conductivity as 0.45 S·cm^-1 and strong fluorescence has been successfully synthesized basing on polyaniline (PANI) nanostructures doped with a new prepared fluorescein TPABTDBN. The PANI nanostructures were prepared via a simplified template-free method (STFM) with FeCl₃ as oxidant and dopant. The resulting sample was characterized by SEM, IR and fluorescence spectroscopy. The fluorescence intensity of synthesized composite improves with the increasing content of TPABTDBN. The electrical properties of pressed composite pellets were measured from room temperature about 291K down to 132K, the conductance follow the exponential temperature dependence of three-dimensional variable-range hopping (VRH) model.

Abstract: A kind of Cholesteric Liquid Crystal was prepared by mixing CB15 with Nematic Liquid Crystal 1717. The influence of CB15 content on the CLC texture, pitch length and thermal optical properties were investigated. The results indicated that the CB15 content affected significantly the CLC texture and the content in the region of 8.0-12.0 wt% were optimal condition for realizing the thermally erase in which texture could be easily changed from scatting focal conic texture to transparent planar one.

Abstract: This paper analyzed the deformation and stress of the glass substrate and the supporting columns in the vacuum plate glass in high-temperature sealing process with Ansys, which can forecast and guidance for the vacuum flat glass of high-temperature sealing. By performance test of vacuum plate glass after sealing, conclude the organizational structure of glass and welding agent junction is well. The vacuum plate glass of high temperature sealing has a good sealing performance.

Abstract: The maleic acid ( MA ) 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and acrylamide (PAMPS/AM/MA) superabsorbent copolymer was synthesized by aqueous solution polymerization with ammonium persulfate as initiator,N,N-methylene-bisacrylamide ( NMBA) as crosslinking agent. The influence of neutralization degree of MA,mass ratio of AMPS to acrylamide ( AM) ,the amount of crosslinking agent and initiator,and reaction temperature on the absorption capability of water and salt solution were investigated. The results show that the water absorbency of the superabsorbent polymer prepared at the optimum condition in deionized water and in 0.9% NaCl solution is about 235 and 132g/g,respectively,and under the same conditions,the sample has more excellent water absorption and salt-resistance.

Abstract: This paper studies the influence of fly ash with different dosage and grades on the crack performance of airport pavement concrete. In order to test airport pavement concrete material accurately and quickly, Dumbbell Test Method was introduced in its early-age from pouring. Dumbbell Test Method is able to evaluate the effect of fly ash with different grades and dosage on volume stability of airport pavement concrete. This paper also studied the mechanism of the influence of fly ash crack performance of airport pavement concrete.