| Nanowires can be defined as a kind of one dimensional structure, which diameter is less than 100 nm and Unlimited length. Typically, length to diameter ratio of nanowires is more than 100, so that they can be called as one dimensional material. Nanowires can be classified as metal nanowires, semiconductor nanowires and insulator nanowires according to its different composition. Under normal circumstances, with the decrease in size of the nanowires can reflect better mechanical properties, strong intensity, and toughness than bulk materials. These special properties in small scales have made nanowires could be widely used in emerging high-tech fields, such as motor system, superamphiphobic material preparation, solar cells, etc.In this paper, we attempted to synthesize TiO2 nanotubes and hierarchical micro-nanostructures by new chemical method, due to its low cost and potential advantage for large-scale production. The photocatalytic of TiO2 nanotubes and superamphiphobic properties of the obtained structures as well as the relations between their structures and performances have been studied. Detailed research contents are summarized as following:1. Synthesis of MgCO3·3H2O Nano rods via micro-emulsion methodNesquehonite Nano rods (MgCO3·3H2O) are synthesized via a typical micro emulsion homogeneous precipitation method using NH4HCO3 and MgCl2·6H2O solution as raw materials. The effect of different surfactant on the morphology of Nesquehonite nano rods (MgCO3·3H2O) was investigated in this work. It was found that the anionic surfactant sodium dodecyl benzene sulfonate (SDS) showed best induced effect on rod-morphology of sample. Nesquehonite Nano rods (MgCO3·3H2O) with controllable size, uniform size distribution and good shape were achieved successfully. By applying the Nano rods as template materials, TiO2 nanotubes were obtained successfully. The photo activity of TiO2 nanotubes was tested by photo degradation of Rhodamine B. The result shows that the photocatalytic activity of TiO2 nanotubes prepared by the MgCO3·3H2O Nano rods is three times higher than that by P25 Titanium dioxide.2. Controlled synthesis and applications of hierarchical Te@C-SiO2 micro/nano-Structures.One -dimensional Te nanowire was used to synthesize hierarchical SiO2 loaded carbon-coated Te nanowires (Te@C-SiO2) micro-nano structures. The Superamphiphobic Te@C-SiO2 was obtained by deposition and modified with Trichloro (1H,1H,2H,2H-tride-Cafluoro-n-octyl) Silane (FOTS). Wettability measurements indicated that the fabricated Te@C-SiO2 became super-repellent toward a broad range of liquids with surface tension from 27.5 to 72 mN/m. The diameter of Te@C nanowires and SiO2 nano sphere all have a great effect on superamphiphobic performance of Te@C-SiO2-To determine the effects of the fluorination, fluorinated Te@C-SiO2 nanocomposite was spray-coated on various substrates. Such as glass slide, fabric and filter paper. In addition, the fluorinated Te@C-SiO2 was also shaped as bulk superamphiphobic material due to its flexibility. It may be applied into many industrial applications in the future.3. Theoretical research of materials wettability.According to the "beads on a string" model proposed by Tuteja, the hierarchical roughness of Te@C-SiO2 is related to the dual scale structure, the coarser texture derived from Te@C fibers and the finer texture from close packed spherical SiO2NPs. We then systematically investigated the effects of finer/coarser texture on the apparent contact angles (9*) of water and n-hexdecane, respectively. |
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