Advanced Materials Research Vols. 718-720

Abstract: The wastewater from folic acid production contains a large amount of sodium sulfate. In this paper, this sodium sulfate wastewater was used to react with the industry black salt (barium sulfide) to prepare barium sulfate. By adjusting the feeding mode, reaction temperature, reactant concentration and stirring speed, the optimal experimental condition was determined. The barium sulfates particle size under this condition was 320 nm, with good whiteness but low energy consumption. The product not only turns the waste to useful product successfully, but also meets Chinese policy of energy-saving, emission reduction and sustainable development.

Abstract: In frames of a quantum computer implementation, the ordered array of magnetic dipoles nanoparticles is considered. The phase space calculated for system of dipoles, which interact through long-range magnetostatic field. The behavior of nanoarchitectures in an external magnetic field is studied. The degeneracy of the equilibrium magnetic states depending on the value of an external magnetic field and the spin excess of configurations are determined. The presence of degeneration is a classical analog of quantum superposition, and distribution of probability of magnetic state is a classical representation of such quantum phenomena as entanglement.

Abstract: Dynamic compression test on TC6 titanium alloy samples have been done by using a split Hopkinson bar process and extra circuit under conditions of room temperature and high strain-rate. The effect of impressed-current on sensitivity of adiabatic shear of TC6 titanium alloy has been studied. It is shown that the impressed-current can reduce the sensitivity of adiabatic shear of TC6 titanium alloy under the condition of high strain-rate. Free electron in the samples will do direct move and take heat away from high localized area to decrease the effect of the heat. The result will help to delay formation of the adiabatic shear band. So, that is reducing the sensitivity of adiabatic shear of TC6 titanium alloy.

Abstract: The Split Hopkinson Pressure Bar (SHPB) is used to investigate the dynamic compressive mechanical behavior of a new foamed ceramic composite under impact loading. The stress versus strain curves are obtained under high strain rates. The test results are considered to be able to assure conformability of the tests, validate the stress equilibrium assumption, and show that the stress versus strain curves of foamed ceramic composite display strain hardening effect and damage softening effect as brittle materials. Meanwhile the curve includes short plateau region while no densification region.

Abstract: Two different types of un-vulcanized natural rubber, air dried sheets (ADS) and SVR-3L block rubber, were investigated by a new testing method and the results are compared with other mechanical properties. It was found that green strength is strongly reduced if the sample is ther­mal­ly treated before testing. Presumably, the decrease of strength is caused by a decrease of branch points, mainly composed of phospholipids, which are linked to the a - terminal groups of the rubber molecules. The existence of two different types of branch points is indicated by relaxation spectra, obtained from temperature scanning stress relaxation (TSSR) measurements.

Abstract: 9, 10-Phenanthrenequinone (PQ) supported on glassy carbon microparticles by adsorption was dispersed in methyltrimethoxysilane (MTMOS) derived gels to yield a conductive composite which was used as electrode material to fabricate a PQ-modified glassy carbon ceramic composite electrode. It shows good electrocatalytic activity toward the reduction of iodate and could be used as an amperometric sensor for the determination of iodate in table warter.

Abstract: Lanthanide-doped semiconductors find usage in a wide variety of applications. In this work, Eu³⁺-doped rutile TiO₂ nanocrystals have been successfully prepared at room temperature by a sonochemical method. The nanocrystalline sample has been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. A possible mechanism is proposed to explain the formation of Eu³⁺-doped TiO₂ nanomateirals. Additionally, the characteristic emissions of Eu³⁺ can be found upon excitation in the region of TiO₂ absorption, indicating that an energy transfer from TiO₂ to Eu³⁺ occurs for the doped sample.

Abstract: This experiment applied the vapor transport method and the AZO catalyst, and successfully grew ZnO nanowires on silicon substrate. The results showed that the factors such as the position of growth substrate, temperature, temperature rising rate, growth time, gas flow volume, and the proportion of ZnO and carbon composition powder, could decide the quality and characteristics of ZnO nanowire. Optimal conditions for ZnO nanowire growth were: carbon and ZnO powders mixed at a 1:1 weight ratio to serve as the material for growing nanowires, located at a distance of 10 cm from the silicon substrate which already had AZO thin film deposed on it; the growth temperature was set at 1100°C for a continuous duration of 70 minutes; the flow volumes of the nitrogen and oxygen gases within the furnace pipe were 70 and 60 sccm, and the furnace pipe temperature rising rate was 20°C/min. In addition, it was observed by FE-SEM that when the substrate was away from the source material by 10 cm, there was nanowire with the radius of 0.11μm and length of 9.3μm. By X-ray we found the characteristic wave summit of ZnO with lattice parameter a = 0.3249 nm and c = 0.5206 nm, was in fine single crystal structure and the directions were all in (002). In field emission measurements, when the current densities was 0.1μA/cm2, the lower initial electric fields corresponding to it was 0.11 V/μm and had the best field enhancement factor with a value of 1782.

Abstract: By means of full atomistic molecular dynamics (MD) simulation, the solubility parameters for hydroxyl-terminated polybutadiene (HTPB), dioctyl sebacate (DOS), dioctyl adipate (DOA), dibutyl phthalate (DBP), dioctyl phthalate (DOP), nitrated esters nitroglycerine (NG) and diethylene glycol dinitrate (DEGDN) are calculated and the results are in agreement with the literature values. Furthermore, in order to reveal the HTPB/plasticizer blend property, the specific volume vs. temperature curves of the blend systems are simulated by employing MD simulation to obtain the glass transition temperature (T_g). From the specific volume vs. temperature curve, the T_g of HTPB, HTPB/DOS, HTPB/DOA, HTPB/DBP, HTPB/DOP, HTPB/NG and HTPB/DEGDN are 197.54, 176.30, 183.11, 189.27,187.40, 200.03 and 205.31 K, respectively. It should be pointed out that as for HTPB and DOS, DOA, DBP, DOP, the solubility parameters are similar and there is only one glass transition of the blend system, these indicate that these studied blend systems are miscible, but HTPB/NG and HTPB/DEGDN are not miscible.

Abstract: 4-(β-sulfatoethylsulfone)-N-ethyl-aniline was synthesized from 4-(β-hydroxyethyl-sulfonyl)-N-ethyl-aniline in the presence of sulfuric acid using toluene and N,N-dimethyl-dodecylamine as mix solvent. The product was efficiently precipitated from the reaction mixture by addition of a sufficient amount of acetone. Several influencing factors on the esterification were investigated, and the results show that, the optimal conditions were: the molar ratio of 4-(β-hydroxyethylsulfonyl)- N-ethyl-aniline, N,N-dimethyl-dodecylamine and sulfuric acid was 1:1:1.5, the dosage of toluene 800 mL per molar 4-(β-hydroxyethylsulfonyl)- N-ethyl-aniline, and the esterification was taken for 9 hours under reflux. Under the optimal conditions, total yield of the product was 85% with the purity of 97%. It was also found that the yield of product can be promoted up to 90 % by using the recycled solvent. The structure of product was characterized by MS.