Advanced Materials Research Vol. 531

Abstract: Nickel(Ni)-silver(Ag) core-shell nanoparticles with different shell thickness were synthesized with Ni nanoparticles by liquid phase reduction technique form water solution. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and inductively coupled plasma spectroscopy (ICP). The results showed that the Ni nanoparticles are in sphere shape and the average diameter is 104nm , the nickel(Ni)-silver(Ag) core-shell nanoparticles has good crystallinity and the thinkness of Ag nanoshells could be effectively controlled by changing the concentration of silver nitrate. The product can be used for nickel-based conductive paste preparation because of the surface character of Ag and the magnetic property of Ni

Abstract: Intelligent or smart polymer materials are those which are either “active” or responsive to a variety of environmental stimuli, such as changes in PH, temperature, ionic strength, or electric field, or the presence of a specific chemical substrate. Thermally sensitive polymer, poly(N-isopropylacrylamide)(PNIPAAm) base materials, has been of great interest because aqueous solution of PNIPAAm undergo fast, reversible switching around their lower critical solution temperature(LCST) of about 29-38°C(different with their structure). PNIPAAm chains show an expanded conformation in water below the LCST because of strong hydration and change to the compact forms above the LCST by sudden dehydration. , this is the reversible switching effect of hydrophilic to hydrophobic. These switchable materials may have wide applications in functional textiles, controllable drug release, and special fibers. And Electrospinning is a simple, convenient, and versatile technique for generating fibers with diameters that range from several micrometers to tens of nanometers.Herein, we report a electropun method to prepared nano PNIPAAm fiber and its thermal response also dected. With the rusults, the diameter of PNIPAAm nanofiber within respective system around 200nm and beads-less were successfully prepared by electrospun method fabricated in all cases and the reversible switching with LCST(32 °C) feature was also behaved clearly under fiber condition.

Abstract: Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.

Abstract: In this paper, the characteristics, potential applications and preparation methods of functional nano materials were briefly introduced, and in particularly, the virtue of solvothermal reactions, as well as the solvents, were introduced

Abstract: This paper adopts reactive disperse bright-red KR-2B to dye wool skeins in supercritical CO2 dyeing equipment. The influencing factors are analyzed by measuring the surface depth of dyed wool skeins, including time, temperature and pressure, and the optimal dyeing parameters are as following: time 60min, temperature 120°C, pressure 24 MPa. Then we adopt the scanning electron microscope (SEM) and the infrared spectrum (FTIR) to observe the apparent shape and structure before dyeing and after dyeing. The results indicate that the global dye structure divide and the dyestuffs have good fixation on the wool skeins.

Abstract: 1D conjugated polymers belong to the family of organic semiconductor materials, in which the charge carriers are polarons or bipolarons. Charge transport in 1D organic semiconductors in the presence of high electric fields is studied within the SSH model. It is found that under a sufficiently high electric field, the polaron is dissociated into free-like electron. The electron performs Bloch oscillation (BO) in the organic semiconductors. By enhancing the electric field, BO will be destroyed and electrons can transit from the valence band to the conduction band, which is Zener tunneling in organic semiconductors. The results also indicate a field-induced insulator-metal transition.

Abstract: Using sodium tungstate and cesium carbonate as raw materials, cesium tungsten bronze (CsxWO3) powders were synthesized by low temperature hydrothermal reaction with citric acid as the reducing agent. The CsxWO3 films were prepared on glass using polyvinyl alcohol solution as dispersing agent. The microstructure and morphology of CsxWO3 powders were characterized by XRD and SEM, and the optical spectra and heat insulation properties of CsxWO3 powder and films were investigated. The results indicate that the synthesized cesium tungsten bronze powders have hexagonal Cs0.32WO3 crystal structure. The as-prepared CsxWO3 powder and films show strong near-infrared absorption and near-infrared shielding properties. Furthermore, the near-infrared shielding performance of glass coated with CsxWO3 film has been further improved after UV irradiation. Especially, the glasses coated with CsxWO3 films which was synthesized from the non-ethanol precursor solution exhibit most outstanding near-infrared shielding performance and best heat insulation effect. In comparison with the blank glass without CsxWO3 film, the heat insulation temperature difference can achieve 24.8°C.

Abstract: We prepared FA-targeted and 10-hydroxycamptothecin loaded chitosan nanoparticles (FA-HCPT-NPs) with a combination of emulsion-solvent evaporation and chemical crosslinking method. In vitro cytotoxicity test to the Human Cervix Carcinoma cells (HeLa) was evaluated by cell morphology and internalization observation. The specicity of the FA-HCPT-NPs targeting cancerous cells was demonstrated by comparative intracellular uptake of HCPT-NPs and commercial availible HCPT injection. Laser confocal scanning imaging proved that FA-HCPT-NPs could greatly enhance up-take by HeLa cells. The morphological changes of HeLa cells showed the FA-HCPT-NPs could inhibit HeLa cells more effectively than HCPT-NPs and HCPT. The results indicated that the novel FA-HCPT-NPs could be a potential drug delivery system for tumor cell-selective targeting therapy.

Abstract: By fluid analysis for the finite element models of "S"-shaped and straight waterways with ANSYS, through thermal analysis for the finite element models of the function blocks with and without holes cooling after flow analysis, by comparison of the temperature field, function blocks with hole deformation is narrowed, the product quality can thus be improved.

Abstract: The modification effects of the cement and the water-based epoxy resin on the asphalt emulsified mortar are studied. The result shows that with the cement content 30% and water-epoxy resin emulsified content 30%, the modified asphalt emulsified mortar which can replace cement mortar meets the demands of the relative criterions. When the temperature reaches 140°C, both the tensile bond strength and the shear bond strength decrease to 0.1 MPa. So it is feasible to recycle the decorative stone .The micro-analysis of the modified mortar are investigated by using IR and TGA-DTA, and its modification mechanism is also discussed.