Advanced Materials Research Vols. 236-238

Abstract: A three-dimension computational fluid dynamics study on spray tower of aqueous ammonia process is presented. The gas flow is described using standard turbulence model ,and the motion of the liquid droples is described in a Lagrangian way, using the stochastic discrete particle mode. The influence of parameters including ammonia concentration, liquid gas ratio and porosity of air distributor on the efficiency of FGD was studied. When liquid-gas ratio is about 2.2, the concentration of NH₃ is about 0.09% and the porosity of air distributor is between 70% and 80%, the SO₂ removal efficiency of spray tower will be higher from the result. It can be taken as a reference for process design, optimization and intensive study of desulfurization by aqueous ammonia process.

Abstract: The magnetite (Fe₃O₄) nanoparticles with immobilized metal affinity ligands were prepared for protein adsorption. First, magnetite nanoparticles were synthesized by hydrothermal method. Charged with Zn²⁺, the magnetic nanospheres were applied to adsorb bovine hemoglobin (BHb). The morphology and magnetic properties of magnetic nanospheres were investigated by TEM. These magnetic nanospheres modified with metal ligands can be used efficiently in protein affinity separation and purification.

Abstract: We present a simple method to synthesize the mesoporous Fe₃O₄@SiO₂ via two-step procedure on large scale, and CTAB plays dual role in the sol-gel reaction. First it can prevent the Fe₃O₄ from depositing, ensure to obtain silica homogenouly coated Fe₃O₄. What’s more important, it also act as the template to synthesize the mesoporous Fe₃O₄@SiO₂. In addition, the mesoporous Fe₃O₄@SiO₂ will be potential in application of bioseparation.

Abstract: To produce dried garlic soluble solids extract (GSSE), the method of the economical and rapid method of fining fructan extracts solution was investigated. The acidic silica sol and the bentonite as fining reagents at different concentrations were added into the garlic juice at soluble solids (SS) 6%,12% and 15% (W/W) and at pH 4, 5, 6, 7. The results showed that pH values affected fining firstly, and silcan sol did secondly at SS = 12% but bentonited did secondly at SS = 15%. When silica sol and bentonite were added at 0.2% and 0.1% (V/V), respectively, and at pH 4, the clarifying operation not only reached an acceptable yield of protein precipitate and other impurities, but it was also economically viable. It is concluded that acceptable fining parameters waries based on the GSSE and could be obtained according to the test for the producing dried GSSE as the source of fructan.

Abstract: Camellia oil is the main component of the camellia seed and has many beneficial functions to human health. An investigation into ultrasound- assisted extraction was conducted for the oil extraction from camellia seed. The optimized condition of extraction parameters obtained with the response surface methodology (RSM) at a four-variable, three-level experiment Box–Behnken design (BBD), was as follows: liquid-solid ratio, 5mL/g;ultrasonic power,155W;ultrasonic treatment time,31 min; and ultrasonic treatment temperature, 55°C, under these conditions, the oil yeild was 44.55%. GC–MS analysis showed that the content of unsaturated fatty acid in camellia oil was up to 84.47% and the content of oleic acid was over 76.15%.

Abstract: Europium (Eu³⁺)/porous silicon (PS) nanocomposites have been formed by impregnation of PS layer in acetone solution of europium. The surface morphology of samples was characterized by scanning electron microscopy. The photoluminescence (PL) spectrum of samples shows an increased PL intensity of emission peak at 474 nm under excitation of 370 nm. It was found that there is an efficient energy transfer from Tb³⁺ to Eu³⁺ and to Silicon nanocrystallites.

Abstract: This study compared the main compositions of the different areas walnuts. A large diversity was found in moisture, ash, total fat and crude protein content. We got four kinds of walnuts from different areas of northeast China (A: Suifenhe Heilongjiang B: Yichun Heilongjiang C: Mudanjiang Heilongjiang D: Baishan Jilin). The sample D has the most moisture compared the others, 6.563%. The ash and total fat contents of the sample C are more than others, respectively 2.96% and 56.42%. For the crude protein, the kind from sample A is the most, 34.349%. The experiment also studied the protein extraction of the degreased kernel by distilled water. During the extracting process, three main factors including ratio of solid to liquid, exacting time and temperature were studied by using single factor analysis method. According to orthogonal test results, when the solid-liquid ratio, time and temperature were respectively 1/45, 3.5h, 45°C, the material (WKCD) had the highest protein extraction ratio 57.62%.

Abstract: Fe₃O₄ nanoparticles and poly(N-isopropylacrylamide-co-methacrylic acid) were combined to form dual-magnetic thermosensitive microspheres. The results of fourier-transform infrared (FTIR) spectroscopy, transmission electron microscope (TEM) and thermogravimetric analyzer (TGA) confirm that the microspheres are characterized with a magnetic Fe₃O₄ core, a poly(N-isopropylacrylamide-co-methacrylic acid) shell, and an average diameter of about 150-300nm. Spectra of wide angle X-ray diffraction (WAXD) indicate that the copolymer on the surface of Fe₃O₄ nanoparticles shows no influence on the inverse cubic spinel phase of Fe₃O₄. The lower critical solution temperature (LCST) of the thermosensitive copolymer-shell is about 39°Cas determined by a turbidimeter. Besides, the microspheres exhibit an obvious advantage using magnetic separation, and can be heated through an external alternating magnetic field to generate thermal effects, thus possess dual-magnetic responses (including magnetic delivery and magnetic-thermal effects). The synthesized microspheres with dual-magnetic and thermosensitive responses have potential applications in a magnetic drug-targeting delivery system for controlled drug release.

Abstract: Ordered mesoporous SBA-15 was synthesized through hydrothermal process under acidic condition. The material was characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), small-angle X-ray diffraction (SAXRD), and N₂ adsorption-desorption. The results indicated that SBA-15 has 2-dimensional hexagonal p6mm mesoscopic structure and well-ordered parallel mesochannel. The as-obtained mesoporous silica was used for controlled release of water-insolube drug emodin. The loading capacity could achieve 6.64 mg/g, and the release profiles that studied in phosphate buffered saline (PBS, pH = 7.4) showed that released amount of emodin was 95.8 % after 48 h.

Abstract: In this study, rice straw (Oryza sativa L.) fibril and fibril aggregates (RSFs) material isolated by high intensity ultrasonication (HIUS) was used as reinforcement in an RSFs/Polypropylene (PP) nanocomposites. The morphology of RSFs was investigated by scanning electron microscopy (SEM). The mechanical properties were evaluated by tensile test. The fourier transform infrared spectroscopy (FTIR) test was also performed to investigate the interface compatibility between RSFs and PP matrix. Results indicated that the tensile strength of RSFs/PP nanocomposites increased with increasing cycle time of extruder from 10 min to 30 min at 180°C. The maximum value of tensile strength was 31.2 MPa appeared at the conditions of 190°C and cycle 20 min. The elastic modulus increased by adding 5 wt% RSFs into the PP/MAPP matrix. However, there was no distinct difference of elongation in RSFs/PP nanocomposites at different extruder conditions. The RSFs embedded into the PP/MAPP matrix and exhibited better interaction by FTIR test.