Advanced Materials Research Vol. 1083

Abstract: Three kinds of polyvinylidene fluoride (PVDF)-based immobilized metal affinity membranes (IMAM), namely, Cu (II)-IMAM, Co (II)-IMAM and Ni (II)-IMAM were prepared to recover bovine serum albumin (BSA) from the solutions. Adsorption of the aforementioned membranes towards BSA were studied with the presence of Ca (II) and PO₄^3–. The adsorption performance of the membranes followed the order of Co (II)-IMAM > Cu (II)-IMAM > Ni (II)-IMAM. The existent PO₄^3– exhibited a larger interference on BSA uptake than Ca (II).

Abstract: A new copolymer of acrylamide (AM) and Isobutane-Ethylhexyl acrylate (2-EHA) was synthesized as profile control agent by free radical copolymerization. The copolymer composition obtained by element analysis method led to determination of reactivity ratio by employing YBR calculative method. The result indicated that the reactivity ratios of AM and 2-EHA were 0.856and 0.592 respectively. The chain segment distribution of copolymer was investigated from reactivity ratio and the microstructure of copolymer molecule was analyzed. The results showed that the ratios in feed can hardly change the chain segment distribution. The proportion of 1M1 decreased with the increase of AM in feed. AM and 2-EHA had a tendency to alternate in copolymer chain when f₁=0.286~0.375. The monomer which had a low ratio in feed inserted in copolymer chain with 1M chain segment and the other monomer was separated evenly. It can help to study copolymerization for AM and 2-EHA for industrial production in mass.

Abstract: Nowadays, the earth’s available oil reserves decreases gradually while a great demand for oil is increasing.To improve oil recovery technique, the development of new profile control agent has important scientific significance and application value. A new copolymer of acrylamide (AM) and Isobutane-Ethylhexyl acrylate (2-EHA) was synthesized as profile control agent by free radical copolymerization. FT-IR and 1H-NMR were used for the structure characterization. Thermo gravimetric analysis, Core/Sand pack experiments and water drive displacement tests of copolymer particles were used to evaluate the properties. The results showed that the copolymer particles had good thermal stability, alkaline resistance, anti-salt property and excellent blocking property as profile control agent.

Abstract: In the present work, a detailed study of the structural relaxation through the complex inductance response by using Inductance Spectroscopy (IS) of Fe-based amorphous ribbons obtained by as quenching ultra-rapid technique, as a function of frequency form 4 to 400 kHz and under thermal treatment during 10, 20, 40, 60, 120 and 180 min, is presented. The analysis of experimental results of IS plots of real (L ́) and imaginary (L ́ ́) inductance show evidence of magnetization processes associated with domain walls: At low fields and low frequencies, L ́ showed a plateau, followed by a dispersion with a relaxation character, the relaxation frequency is about 100 kHz (domain wall bulging). For higher fields, the inductance value depended on the field amplitude (domain wall displacement). As the frequency increased, all the curves merged into the low field plot and exhibited the same relaxation dispersion. The dependence of magnetization processes on the domain wall is determined and interpreted on the basis of the domain wall motion equation. In this way the structural relaxation associated with domain dynamic is discussed and we can establish criteria for the design of certain filters at low frequencies (from 4 to 50 kHz).

Abstract: Hepatocarcinoma, a malignant cancer, threaten human life badly. It is a current issue to seek the effective natural remedy from plant to treat cancer due to the resistance of the advanced hepatocarcinoma to chemotherapy. Puerarin (Pue), a major active ingredient in the traditional Chinese medicine Gegen, has a wide range of pharmacological properties and is considered to have anti-hepatocarcinoma effects. However its low oral bioavailability restricts its wide application. In this report, Pue-nanosuspension (Pue-NS) composed of Pue and poloxamer 188 was prepared by high pressure homogenization technique. The in vitro anti-hepatocarcinoma effects of Pue-NS relative to efficacy of bulk Pue were evaluated. The particle size and zeta potential of Pue-NS were 218.5 nm and −18.8 mV, respectively. MTT assay showed that Pue-NS effectively inhibited the proliferation of HepG2 cells, and the corresponding IC₅₀ values of Pue-NS and bulk Pue were 3.39 and 5.73 μg/ml. These results suggest that the delivery of Pue-NS is a promising approach for treating tumors.

Abstract: We note that for a wide range of porous, especially granular, ferromagnetics used as matrices of magnetic filter-separators, there is still an issue of defining their demagnetizing factor N which has a dramatic effect on the values of average magnetic permeability of these operating units of filter-separators. The work aims at filling the existent gaps in the issue, we supply N values depending on the relative size of such magnets as well as a respective generalizing phenomenological dependence which is characterized by an exponential realtion between the demagnetizing factor and relative size radical. The established relation allows obtaining real values of magnetic permeability of a short filter matrix thus providing an unbiased comparative estimate of its technological workability.

Abstract: In order to study the effect of tantalum to the microstructure and phase composition of Co-8.8Al-9.8W-XTa (X=0,2,at%) superalloy. The Co-8.8Al-9.8W-XTa (X=0,2) supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum induction melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etching solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by OM and XRD analysis. It can be found that the 9.8W and 2Ta alloy were mainly composed of rich γ-Co matrix of austenite precipitation of γ phase and coherent with matrix of the L1₂ structure of γ′-Co₃(Al,W) phase. In addition, Ta element has effect on grain refinement and the number of γ′-Co₃(Al,W) phase refines grain.

Abstract: Styrene (SM), methyl methacrylate (MMA), and butyl acrylate (BA) were used to synthesize a polyacrylic emulsion by core-shell emulsion polymerization. The solid content of the emulsion reached 40% using reasonable reactive emulsifier contents and feeding modes. Then, two kinds of fibers (recovered and hardwood fiber) were respectively dispersed, coated, and dried with emulsion. Finally, fiber-based water-resistant material was successfully fabricated. The experimental results showed that under the conditions of a mass ratio of polyacrylic emulsion to fiber of 2:1, the Cobb value of the material reached 7.1 g/m² and 10.8 g/m² respectively. Cobb value of recovered fiber material was more stable than hardwood fiber, and stayed in a lower variation scope on the whole. Using scanning electron microscopy (SEM) to observe the surface morphology of products. The SEM results proved that, the polyacrylic emulsion filled the gaps between fibers, decreased the porous structure. This filling effect led to a continuous structure, and kept the water from infiltrating inside of the material. On the other hand, for the short fiber in recovered fiber material arranged closer, the water resistance of the material was further enhanced.

Abstract: Molecularly imprinted polymers could selectively adsorb the target analytes from complex matrix. Chinese medicinal herbs had the characteristics of multi-component contents and complicated matrix. Molecularly imprinted polymers were very suitable for the selective extraction and purification of effective components in Chinese medicinal herbs. In this paper, the preparation methods of quercetin molecularly imprinted polymers and its applications in the separation and analysis of Chinese medicinal herbs were comprehensively reported. It would be a good reference for the selective separation and purification of quercetin in Chinese medicinal herbs.