Applied Mechanics and Materials Vols. 268-270

Abstract: We prepared alginate-chitosan (ALG-CTS) complexes through ionic interaction, and then obtained Cu (II)-imprinted alginate-chitosan complex microspheres (Cu-ALG-CTS) by coupling with ionic imprinting technology. To investigate the effects of experimental conditions on adsorption behavior, we performed a series of experiments including changing the initial concentration of Cu (II) ions and adsorption time. We found that the adsorption capacity increases with the initial concentration of Cu (II) ions. The Cu (II) ions adsorption reaches the maximum of 70.54mg/g after adsorbing for 13h when the initial concentration of Cu (II) ions is 60μg/ml. Cu-ALG-CTS shows much higher adsorption for Cu (II) ions than Zn (II) ions. And the adsorption kinetics and equilibrium adsorption isotherm were further studied.

Abstract: A porcine ADM was prepared by the means of combined treatments with alkali, enzymes, sodium lauryl sulfate (SDS) and NaCl solution. Concentration and process time of enzymes were varied respectively, and their effects on properties of ADM were evaluated, such as porosity, mechanical properties, enzymatic degradation. The composition of ADM was detected with an amino acid analyzer, and its microstructure was observed under SEM. To estimate its cytocompatibility, cells proliferation tests were performed by MTT assay, and cells distribution was viewed under CLSM. With increase of enzymes concentration and process time, the porosity of ADM was enhanced, but its ultimate tensile strength was weakened. And enzymatic process time affected the degradation rate of ADM in collagenase solution greatly. The obtained ADM framework had interconnected pores at about 100 μm in diameter. The MTT assay and CLSM image indicated that cells cultured on ADM proliferated well and distributed evenly. The prepared ADM has good microstructure, high mechanical properties, controlled enzymatic stability and good cell compatibility, and it has great potential use in the tissue engineering for further study.

Abstract: By separation and purification experiment, microorganisms were obtained. The paraffin removal strain was named for SW-1. Microscopic and morphological examinations showed strain SW-1 was to be Bacillus Cereus. After strain SW-1 treatment, the number of strain SW-1 increased from 2.7×10⁶/mL^-1 to 3.5×10⁸/mL^-1, which increased by two orders of magnitude; the degradation rate of paraffin could reach to 64% within one month; the prevention rate of paraffin could reach to 43%; the viscosity of crude oil reduced from 35.9mPa•s to 26.8mPa•s, the reduction rate of viscosity was 25.3%, and the freezing point of crude oil reduced by 4.3°C; surface tension reduced from 44.5mN•m^-1 to 29.1mN•m^-1, the reduction rate of surface tension was 34.6%, and pH value was reduced to 6.3. These phenomenon indicated that strain SW-1 has better removal paraffins effect.

Abstract: This paper studied the property changes of environmental degradation mulching film and polyethylene mulching film in water environment. The XRD (X-ray diffraction) cures showed that the diffraction angles of environmental degradation mulching film were not changed but intensities and area of diffraction peaks increased after immersion for 60 days; while the diffraction angles and area of diffraction peaks of polyethylene mulching film were same before and after immersion. Cracks and holes appeared in surface of environmental degradation mulching film, but it was still smooth and uniform for the polyethylene mulching film after immersion.

Abstract: The test studied three ways of modification effect for ramie fiber, included PVC coated, MMA graft and silane coupling. Also the diverse factors for modification were explored under the situations of hydrophilicity, biodegradability and parasitotropism. The results showed that: All modified ways for KH-570 silane coupling, PVC coated, and MMA graft could reduce bibulous rate of ramie fiber effectively, which PVC coated was best (10.42 %), while bibulous rate of MMA graft was 10.56 %. Both of all were lower than the bibulous rate of unmodified (4-5 %). Then soaked in conditions of distilled water, anaerobic sludge and anaerobic sludge, the mass loss unmodified were largest, loss of minimum were MMA grafting, MMA grafting and KH-570 coupling, with the mass loss rate were 11.67 %,21.23 % and 22.73%,respectively. With the situation of high salt concentration, the modified fiber degraded significantly that all of the degradation rate were lower than 8%. The biological properties of ramie fiber were effectively enhanced by modification way of MMA grafted, in aspects of hydrophilicity, biodegradability. Under the condition of MMA grafting, microbial growth and purifying effect, the service life of the fiber was prolonged efficacious.

Abstract: Removed due to double publication

Abstract: The AFPs and water molecules are considered together when they adsorb on the ice surface in this article. Based on Myers and Prausnitz’s ideal adsorbed solution theory(IAST) and Langmuir adsorption model, the coverage rate of HPLC-6 on the ice surface is calculated when considering the adsorption of water, and the thermal hysteresis temperature of HPLC-6 is also given. The results show that the thermal hysteresis temperature increases as the concentration increases, and the theoretical result is agreement with experimental data.

Abstract: Banana fibers were processed with different concentration of alkali solution and different process time. The change of tensile properties, linear density and crimp of fibers before and after process was analyzed. The results showed that the elongation at break of banana fibers increased, the initial modulus decreased and lots of crimp were produced after alkali treatment. However, the linear density increased and the strength decreased.

Abstract: By using a novel terpyridine-based dye (4-(4-2-[dimethyl4,4'-(phenylazanediyl) dibenzoate]phenyl)-2,2:6,2-terpyri-dine(L)) as a surface stabilizing agent, novel dye-capped ZnS were obtained. The photophysical properties of these dye-capped ZnS have been investigated experimentally. These hybrid particles (ZnS/L) aggregate a large spherical structure observed by scanning electron microscope (SEM) exhibiting novel luminescent properties, which differ from those of the pure L.

Abstract: The nitriding of AISI 316L stainless steels has been carried out at anodic potential in a space enclosed by an active screen that consists of two cylinders with different diameter. These two cylinders made up a hollow cathode in a discharge system. Nitriding experiments were carried out on AISI 316L stainless steel at 450°C for times ranging from 1 to 24h in ammonia atmosphere. The intensity of electron bombardment on the surface of sample was low due to the anodic sheath, the disadvantages attached to conventional plasma nitriding were completely avoided. The phase composition, the thickness and the surface topography of the nitrided layer, as well as its hardness, were investigated by X-ray diffraction, scanning electron microscopy and a micro-hardness tester. The surface microhardness values and the thickness of the hardened layers increased as the nitriding time increased. Tribology properties of the untreated and nitrided 316L stainless steel have been investigated using a ball-on-disc tribometer with AISI52100 ball as the counterface. The results showed wear resistance of the AISI 316L stainless steels were greatly increased by anodic nitriding, owing to the strengthening effect of expanded austenite formed in the modified surface layer.