Advanced Materials Research Vols. 989-994

Abstract: In order to researching the microstructure of bioceramic coating on the surface medical titanium alloy (Ti–6Al–4V), the gradient bioceramic coatings are fabricated by wide-band laser cladding. The influence of multiple rare earths oxide La₂O₃ and CeO₂ on microstructure of bioceramic coating were studied. The experimental results demonstrated that mixed La₂O₃ and CeO₂ have an effect on forming-ability of HA\β-TCP in bioceramic coating and also refined the grain of bioceramic coatings. The largest amount of HA\β-TCP is presented among all the groups when the contents of La₂O₃ and CeO₂ are 0.6wt.%, 0.4 wt.%, respectively.

Abstract: The ion-ion interaction contribution to the Helmholtz free energy is one of thermodynamic properties which discribing full ionized hydrogen plasma. Based quantum statistical theory and its simulation results to construct the free energy model of statistical mechanics, it is great significant to understand the properties of full ionized hydrogen plasma under high temperatures and pressures. Using Fortran program, we calculated the isotherms with some sensitive parameters, making comparison between our results and the formers. We find that former formula proposed by Chabrier appears variation at ultra-high temperatures ( > Κ ), implying a prominent limit of low temperature, while we developed a more reasonable formula of the ion-ion interaction contribution to the Helmholtz free energy. Analyses on isotherm curves indicate that the thermodynamic properties of the ion-ion interaction contribution to the Helmholtz free energy described by our approximant is very stable at all temperatures and pressures without any unphysical effects at low temperatures.

Abstract: Five kinds of catalyst were prepared with Chromium, cadmium, cobalt, copper, nickel loading on the γ–Al₂O₃. Catalyst loading rate, effects to the ozone suction rates and water quality change situation of catalytic ozonation to leachate were studied. It can be found that when the mO₃/mCOD equaled 0.11, 0.15 and 0.26 separately, and mCatalyst/mCOD fixed at 5, the cobalt has the highest loading rate, the cadmium catalyst could improve the ozone absorption rate, the chromium catalyst makes against the ozone absorption rate, the copper catalyst can increase the COD removal rate and the nickel catalyst has advantages for the NH₃–N removal rate. Results indicate that: the leachate COD removal rate increased by 20.2 percent by the copper catalyst adding and the NH₃–N removal rate rise 20.7 percent with the nickel catalyst; the best dosage of the ozone in catalytic ozonation is mO₃/mCOD at 0.12 to 0.13; the degree of oxidation is exited.

Abstract: Electrochromic composite film consisting of TiO₂, chitosan (CS) and carbon nanotubes (CNTs) were fabricated on quartz and FTO substrates by the layer-by-layer self-assembly method (LbL). The multilayer film was characterized by UV-vis spectrum, scanning electron microscopy (SEM), cyclic voltammetry (CV) and chronoamperometric (CA) and in situ spectral electrochemicalmeasurements. The composite material shows high electrochromic performance, with the optical contrast of 11.5% and coloration efficiency of 21.7 cm²/C at 800 nm. The results indicate great promise for the TiO₂-based film as a potential material in electrochromic devices.

Abstract: Study of the antioxidant activity of chondroitin sulfate extracted from chicken cartilage. The total antioxidant capacity, inhibition the capacity of anti-superoxide anion, hydroxyl radical, anti-liposome and Alkyl radical was determined, respectively; the effect of the anti-oxidation of chondroitin sulfate was observed. The result indicated that chondroitin sulfate had the strong elimination ability to the five free radicals. The ability of total antioxidant the values of scavenging activities of the maximum inhibition rate to anti-superoxide anion, hydroxyl radical, anti-liposome and alkyl radical was 30.56 U/mL, 97.74%, 80.69% ,48.05% and 78.57%, respectively.

Abstract: This thesis mainly studies the preprocessing of making high strength gypsum powder by using phosphogypsum. And bring out the new preprocessing of phosphogypsum from the traditional methods. And the new method improved the traditional 3 kinds of processing methods. After processing of phosphogypsum, strength and crystal morphology were compared to shown the better one.

Abstract: In this study, the micro-polluted water of a reservoir filled with Yellow River water in Shanxi was used as the raw water. The removals of chemical oxygen demand (COD_Mn), ammonia nitrogen, petroleum substances, and volatile phenol were investigated by ozone-activated carbon process. Results showed that ozone-activated carbon process had a good removal of the pollutants mentioned above. The optimum dosage of ozone for each pollutant was 2.0 mg/L, 2.5 mg/L, 3.0 mg/L, 3.0mg/L, with the corresponding removal efficiency of 59.36 %, 88.01%, 79.31%, and 88.16%, respectively. The treated water quality could meet the standards for Drinking Water Quality (GB5749-2006) in China.

Abstract: The present paper describes the preparation of novel biodegradable adsorbent based on cross-linking of poly (γ-glutamic acid) (γ-PGA) and gelatin and characterization of its Rhodamine B dye adsorption capability. Cross-linking effect was measured with the effect of adsorbent adsorbing ionic dyes Rhodamine B. In the experiment, the various factors which had influence on the adsorption effect, including preparationtemperature, preparation pH value, concentrations of cross-linking agent, cross-linking time were analyzed. The results showed that the adsorbent had good adsorption performance after cross-linking. The adsorbent was characterized by fourier transform infrared spectrum (FTIR), revealing that there were amide bonds between gelatin and poly (γ-glutamic acid) by cross-linking reaction.

Abstract: The expansion mechanism of expandable graphite (EG) was studied systematically in this paper. Based on the feature of the structure and the linear expansion of expandable graphite, a simple expansion model was established by the energy balance and mass balance equation. And the model was modified by setting of the boundary conditions. The result showed that a good agreement is confirmed by comparing the test data and model, especially the two inflection points of the growth rate. The study may provide theory support for improving using condition and expand application fields of the expandable graphite.

Abstract: Poyanghu Lake located in the northern Jiangxi Province is the largest freshwater lake and also the second largest lake in China. In the present contribution, several water samples have been collected and carried out for hydrogen and oxygen isotope analyses. The results suggest that they have relatively higher hydrogen and oxygen isotopic ratios than those of meteoric water. Combined with previous data, we propose that the Poyanghu Lake water display higher stable isotopic compositions due to the strong evaporation and water-rock interaction.