Advanced Materials Research Vol. 1051

Abstract: The thermoluminescence glow curves were simulated in terms of the fractal rate kinetics. It was analyzed how effective spectral dimensions of systems of traps and recombination centers influenced geometrical parameters of peaks. It was shown that high values of the form-factors could be interpreted in fractional kinetics terms taking into account an inhomogeneous spatial distribution of defects in material.

Abstract: In this study, the degradation behavior of circulating fluidized bed (CFB) fly ash reinforced unsaturated polyester composites at different loadings of 0%, 10%, 20%, 30%, and 40% CFB fly ash were observed at different temperatures of 30°C, 50°C, and 80°C under acidic environment. The mass uptakes of the samples were recorded at specified time intervals to determine the effects of fly ash content and temperature. Scanning electron microscopy was used to show if there were changes in the microstructure of the samples. Moreover, the glass transition temperature found from the differential scanning calorimetry showed that the types of diffusion behavior that may take place were the Fickian and non-Fickian (Case II). However, the empirical diffusion model used illustrated that only the Fickian diffusion had occurred.

Abstract: This paper presents a study on the different fire retardant treatment technologies influence on the physical and mechanical properties of bamboo particleboard. The results showed: the properties of bamboo particleboard would change with changing of fire retardant treatment technology; among them the treated technology of fire retardant spraying after resin blending had larger changed; compared with non-fire retardant bamboo particleboard, the density and moisture content (MC) and 2h thickness swell (2h TS) of fire retardant bamboo particleboard had a little improved, and their internal bond (IB) and modulus of rupture (MOR) and modulus of elasticity (MOE) had slightly reduced.

Abstract: We utilized pressure-, vacuum-, and evaporation-assisted self-assembly techniques through which graphene oxide (GO) was deposited on modified polyacrylonitrile (mPAN). The fabricated composite GO/mPAN membranes were applied to dehydrate 1-butanol mixtures by pervaporation. Varying driving forces in the self-assembly techniques induced different GO assembly layer microstructures. XRD results indicated that the GO layer d-spacing varied from 8.3 Å to 11.5 Å. The self-assembly technique with evaporation resulted in a heterogeneous GO layer with loop structures; this layer was shown to be hydrophobic, in contrast to the hydrophilic layer formed from the other two techniques. From the pressure-assisted technique, the composite membrane exhibited exceptional pervaporation performance at 30 °C: concentration of water at the permeate side = 99.6 wt% and permeation flux = 2.54 kg m-2 h-1. This excellent separation performance stemmed from the dense, highly ordered laminate structure of GO.

Abstract: The influence of deformation on the TiC precipitation morphology in the ferrite matrix has been conducted in the present research. When the isothermal holding temperature maintains at lower temperature, the carbide size and the sheet spacing becomes smaller. Therefore the steel with higher hardness can be gained in the low isothermal holding temperature. Moreover the interface precipitation morphology can usually be seen in the high isothermal holding temperature. It is because the slower α/γ interface moving velocity is benefit for nucleating events to occur in the interface. The carbides nucleated at dislocation can act as the dominant strengthening mechanism in the deformed condition.

Abstract: The CO₂ fixation reaction performance was carried out by using propylene oxide (PO) as reactant and medium and ionic liquid as catalyst. Through variation of reaction temperature, pressure and catalyst ratio and amount, it was found that the reaction was under kinetic control, for pressure ranging from 15 to 50 atm, rather than mass transfer control. From the kinetic data, it shows a pseudo first order kinetics with respect to PO concentration under constant CO₂ pressure. The corresponding activation energy was calculated to be 9.152 kcal/mol. The reaction kinetics was independent of catalyst ratio and amount, yet the optimal catalyst ratio of [Bmim]Br/ZnCl₂ is 2 for the fixation reaction. It is also a high conversion reaction, 96.0% (PO), with easier product separation, and as applied to industry for CO₂ reduction process, its kinetic information would be very useful for future industrial scale reactor design.

Abstract: The xylene formaldehyde unsaturated polyester resin was synthesized with glycol, xylene formaldehyde resin and maleic anhydride (MA) as raw materials using styrene as diluent. It was used in putty. The dosage of hydroquinone (HQ), propylene glycol (PG) and diethylene glycol (DEG) mole ratio on the influence of the synthesis of the resin and the performance of the putty. The results show that the amount of HQ is about 0.03% of the total mass. the synthetic process is smoothly and the curing performance of the resin is better. The premise is that the mass of PG and DEG possesses 4.5% of the xylene formaldehyde resin mass. Mole ratio of PG and DEG (PG-DEG ratio: 1: 2mol/mol) is critical for high yield.

Abstract: Taking α-quartz of different mass ratio mixed with graphite powder mixture as the initial materials, using the method of combining high-energy mechanical milling with high pressure and high temperature , this work inspected the influences of carbon content on the synthesis conditions of coesite. The experimental products were measured by XRD, TEM, and Raman. The results showed that the existence of carbon can obviously inhibit the formation of coesite, and the higher carbon content of initial materials the higher pressure on forming coesite is needed.

Abstract: In this research, a regioregular poly (3-alkylthiophene) derivative had been synthesized via the post-polymerization functionalization, poly (3-hexylamine thiophene), which are soluble in water and water miscible solvents such as methanol, DMSO. The suitable energy level, good thermal stability and water/alcohol solubility of polymers which promising applied in polymer solar cells and processed by water or environmental-friendly solvents. In blend of functionalization polymers and fullerene derivative potassium [6,6]-phenyl-C₆₁-butyrate shows significant UV absorption decay phenomenon and occur precipitates follow with time increase. To further investigate the mechanism of composite, FT-IR analysis and TEM investigate were used, the polymer would be bonded with carboxyl of fullerene derivative via hydrogen bonding in the carboxyl region and TEM images demonstration the mixture that be able to self-assembly a interpenetrating network composite.

Abstract: In recent years, despite the significant improvement of sequencing technologies such as the pyrosequencing, rapid evaluation of microbial community structures remains very difficult because of the abundance and complexity of organisms in almost all natural microbial communities. In this paper, a group of phylum-specific primers were elaborately designed based on a single nucleotide discrimination technology to quantify the main microbial community structure from GuJingGong pit mud samples using the real-time quantitative PCR (qPCR). Specific PCR (polymerase chain reaction) primers targeting a particular group would provide promising sensitivity and more in-depth assessment of microbial communities.