Advanced Materials Research Vols. 1033-1034

Abstract: This work reported a new approach for the preparation of a promising lead nitroprusside (PbNP) and multi-walled carbon nanotubes (MWCNTs) composite electrode, which exploited the synergistic advantages of PbNP and MWCNTs. And the electrocatalytic performance of the new composite electrode toward glucose was also studied. Comparing with MWCNTs modified electrode and glassy carbon electrode, the new composite electrode exhibited advantages of low applied potential, high current response, good stability and reliability. The PbNP-MWCNTs composite electrode had superior performance, which was expected a good candidate for reliable glucose detection.

Abstract: The scaling is the primary bottleneck problem which blocks the industrialization of ASP technology. Exploitation mining into the late period of the scaling, particulate scaling is appeared in the environment condition of ASP flooding produced liquid. In this paper, the research on validation and evaluation for the particulate scaling was done inside. Using the treatment of hydrochloric acid and burning for the produced liquid of the Fourth Plant of Daqing Oilfield, it can confirm that the particulate scaling is in ASP produced liquid. Then, the method which is the exploitation of the particulate scaling is established. The data analysis by IR confirm that the particulate scaling is calcium carbonate which is micron or smaller.

Abstract: Based on the finite element analysis method to simulate the O-P hardness. Taking S45C steel as an example, comparative analysis of O-P hardness of finite element simulation and O-P hardness of instrument indentation hardness experiment, results show that difference of S45C steel’s O-P hardness between the finite element simulation and real experiment is-2.62% Accordingly seen, O-P hardness can be obtained by finite element numerical simulation method, it’s a possible way to study relations between O-P hardness and Vickers hardness based on finite element numerical simulation techniques.

Abstract: The functions of transformer oil in the transformer were insulation and cooling, its position was very important. Oil usually keeps its good oxidation resistance by adding antioxidants, the most common used antioxidants in the transformer oil was T501, the oxidation rate of oil could be delayed significantly by adding it, thereby the life of oil would be prolonged. But the electrochemical performance of oil would be affected by the excessive addition of antioxidants, so it was important to determine the content antioxidant precisely. This paper mainly studied under the three electrode system, the determined electrode material and electrode size, studied the influence of support electrolyte species on the determination of T501 by electrochemical methods, choose the most suitable electrolyte solution type. It was further demonstrated that the working electrode was a 4 mm-diameter graphite electrode, Pt coil was used as the counter electrode, the reference electrode was a calomel electrode, the optimum electrolyte was KOH, optimum organic solvent was 98% ethanol solution.

Abstract: In this paper, laboratory glassware with different nature of dirt and experimental requirements is required to choose different washing methods.

Abstract: The electrical conductivity of molten sodium and potassium chloroaluminumates increase with increasing electrical field strength and reach the limiting values. The limiting high-voltage conductivities of the melts surpass their usual values up to 200% in NaAlCl₄ and 700% in KAlCl₄. These results have been obtained on the base of analysis of the microsecond high-voltage discharges in the melts (the Wien effect). After the high-voltage pulses discharges having been completed in the melts, their conductivity has been found to rise up to 50% (the “memory effect”). The relaxation time of a non-equilibrium state reaches 5 minutes and more.

Abstract: The evolution characteristics of pore structure during the decomposition of limestone were experimental measured with nitrogen adsorption method. As a result, the pore structure of calcined limestone has a characteristic of bimodal distribution and the most probable pore sizes are about 3.8nm and 45nm. The probability ratio between the front and following humps decreases at first with the solid fractional conversion and then increases in the later stage of decomposition, and the corresponding inflection point of solid fractional conversion is about η=0.56 under the condition of calcination temperature 1133K. A probability density function with bimodal distribution for pore volume was established to construct the pore structure parameters model. As the average pore size decreased from 38.2nm to14.9nm, the effective diffusion coefficient of gaseous product through the porous solid product layer reduced from 0.0088cm².s^-1 to 0.0017cm².s^-1, which leads to an increase in the pore diffusion resistance affecting the decomposition mechanisms of limestone.

Abstract: The interfacial tension (IFT) and contact angles of different oil/solutions were compared to unveil the influence of Mg²⁺ on oil/NaOH interfacial properties. The results demonstrate that adding Mg²⁺ to NaOH solution cannot change the oil/NaOH interfacial tension when enough OH^- is provided. While for NaOH-surfactant solution, adding Mg²⁺ changes the IFT dramatically. Adding NaOH to oil/water produces a minimal contact angle at NaOH of 0.02wt%. Adding surfactant or MgCl₂ alone increases the contact angles. Adding them together produces a synergism to bringing down contact angles gradually with the increase of NaOH concentration. The change of salinity and the reaction among them may be responsible for the influence and synergism.

Abstract: In this work, we use Mesoscopic Dynamic (MesoDyn) density function simulation to study the compatibility of polymer blends. The mesoscale model for Poly (methyl methacrylate) (PMMA) and Poly (ethylene oxide) (PEO) were set up. The free energy, enthalpy, entropy, order parameters and density profiles were got by the simulation. The results showed that the free energy density keeps constant negative value and the order parameters is much less than 0.1. And phase separation behavior was not observed during the whole simulation time. Using density profiles, the kinetics of phase separation was examined and the phase separation behavior. These indicates that PMMA and PEO is miscible.

Abstract: The compatibilities of polymer blends, Polypropylene (PP) and Polyamide12(PA12) with the quantity ratio 10/90, was simulated by Molecular Dynamics (MD) and Mesoscopic Dynamic simulation (MesoDyn) simulations. Cohesive energy density (CED) and solubility parameters (δ) of pure substances and PP/PA12 blends were got by MD simulations. Flory-Huggins parameter was calculated based on CED values. The mesoscale simulation was related to the molecular simulation through Flory-Huggins parameter. Free energy density and the density profiles were got through MesoDyn simulation. Results showed that solubility parameter difference (Δδ) of PP/PA12 is 4.092 and free energy density value is 0.17 in the equivalent system. And phase separation behavior was observed in the density profiles. All these indicates that PP and PA12 is not miscible which is the same as the experiment results.