Advanced Materials Research Vols. 734-737

Abstract: In the present research, silver antimony co-doped tin dioxide electrodes were prepared via dip-coating pyrolysis method. The effect of silver doping on the composition, morphology, crystallization and electrochemical properties was investigated through various techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) and cyclic voltammetry. The results showed that with proper silver doping, the electrode activity for wastewater treatment may be enhanced.

Abstract: In this study, the vertical single cylinder YANMAR YDG3700N diesel engine power generator is used to find out the physical changes external to the engine under different fuel consumption rates and loads. The fuels used are what a Class A fishing vessel uses, which is blended with four different fuel additives available on the market to compare the combustion of the fuels with the addition of the additives in an attempt to find out the effect on the engine. The result of the experiment shows measurable external physical properties of the engine and fuel consumption rates under the combustion with fuels added with different additives in different proportions under different loading: the changes in engine speed and temperature of the exhaust will serve as a reference for choosing different fuel additives in the market and for better understanding of the properties of the fuel additives.

Abstract: Ti doped aluminum zinc oxide thin film was prepared by DC reaction magnetron sputtering method on the transparent glass substrates. The structure and thermoelectric performance of the deposited (TAZO) thin films are studied by various methods. XRD pattern shows that the TAZO thin film exhibits hexagonal wurtzite structure. After Ti-doping, the thermoelectric properties of TAZO thin film significantly improved at room temperature. The TAZO thin film has the maximum conductivity of 8.33×10⁴ S/m and the Seebeck coefficient absolute value of 34 μV/K, which is respectively larger than that of the corresponding values.

Abstract: Aluminium silicate fiber is an excellent high-temperature material which is widely used in special paper industry in recent years. Due to its property of hardly interweave into the paper and the low strength of the single inorganic fibers paper, it is difficult to make a general basis weight paper. In response to these issues, the strength of the paper was improved by adding some plant fibers. This study takes advantage of good resistance to high temperature of inorganic adhesive and bonding capacity of organic intensifier. Meanwhile two inorganic adhesives (waterglass and ludox) and one organic adhesives carboxymethy starch (CMS) were used in the process of preparing the aluminium silicate paper. The physical properties and insulation properties of the paper which prepared from the difference conditions were studied. The experiment results showed that the adhesive of waterglass and ludox can improve the properties of resistant to high temperature. The adding dosages were 10% and 7.5ml, respectively. The best ratio of alumina silicate fiber to conifier fiber is 7 to 3.The using of CMS can decrease the amount of the plant fiber and its best usage is 10%.

Abstract: Coal component is the basic unit of coal, each component of coal has its special processing properties, Now under the demand of energy conservation and environmental protection , how to sort coal components reasonably and effectively has become a problem needed to resolve immediately. Picking vitrain and fusain by hand, analyzing the pH and add in different solution under the condition of different drugs both surface potential difference, and through the flotation tests determine the appropriate separation conditions. The results show that the enrichment rate of the maceral have improved by electrochemical flotation method .

Abstract: Using ab-initio ultrasoft pseudopotential plane wave approximation method based on density functional theory (DFT), a systematic investigation on electronic and optical properties of ZnS with and without Al-doping has been performed. Calculation results show that Al-doping narrows the band gap of ZnS systems and Al-doped ZnS system changes from semiconductor into metal through the Mott transition. Moreover, with Al-doping increasing, the increase of absorption coefficient and redshift of absorption spectra are obtained. Absorption spectra of pure ZnS and Al-doped ZnS are in good agreement with the experimental results.

Abstract: A four-electrode system was developed to measure in-situ the cation concentration change on the supercapacitor electrode surface for the first time during the charge/discharge process. While the MnO₂ electrode was used in a supercapacitor in K₂SO₄ solution, the potassium ion concentration on the electrode surface was reversible change during the charging/discharging process, decreasing with the reduction process and increasing with the oxidation process. It is clearly clarified that the charge storage mechanism of manganese dioxide, as a supercapacitor active material, involves a fast redox reaction through reversible insertion/desertion of potassium ion and variation of manganese valance.

Abstract: In this article, a wet chemical method was developed to prepare stable ZnO nanofluids. The influences of synthesis parameters, such as EG/water ratio, timing and quantity of NaOH addition, were studied. The thermal conductivity of the ZnO nanofluids was investigated. The results showed that synthesis parameters had significant impacts on the dispersibility and size of ZnO nanoparticles. The thermal conductivities of ZnO nanofluids increased with the increase of particle loading. The enhancement was 11% for 1.1vol% ZnO nanofluid. The effective thermal conductivities of the ZnO nanofluids can not be predicted by the present models.

Abstract: VO₂ films were deposited on quartz glass by rf reactive magnetron sputtering with plasma emission monitoring (PEM). The effects of film thickness 30-194nm on optical properties and phase transition properties were investigated. The transmittance and semiconductor-metal phase transition (SMT) temperature decrease and reflectance of the films in metallic states increase as the thickness of films increases. For 55nm-thick VO₂ film, the luminous transmittance (T_lum) and switching efficiency (∆T_sol) were about 34.1% (20°C) and 35.3 %(90°C) and 6.8%(∆T_sol). Thinner films can provide much higher luminous transmittance but they suffer from an attenuation of switching. The switching efficiency of the VO₂ films does not increase monotonically as the thickness increase. Variable temperature transmission electron microscopy (TEM) measurement reveals that the SMT temperature changes for VO₂ with different orientation.

Abstract: In 6 mol/L HCl medium, NaH₂PO₂ reduced HAuCl₄ to generate gold nanoparticles (AuNPs). AuNPs have a strong resonance Rayleigh scattering (RRS) peak at 369 nm. As HAuCl₄ concentration increases in 0.04-0.8 mmol/L, the AuNPs generated increase, and the RRS peak ΔI_369nm enhanced linearly, the linear regression equation wasΔI_369nm = 5122 C_Au+13.2, linear correlation coefficient was 0.9968. This method has the advantages of high sensitivity, good selectivity, easy to operate.