Direct transition of potential of water droplets to electric energy using aligned single-walled carbon nanotubes

In this paper,we report that an electromotive force (EMF) can be induced in a rope of aligned single-walled carbon nanotubes (SWNTs) when water droplets fall on this rope.The magnitude of this EMF depends sensitively on the slant angle of the SWNTs.Most interestingly,both the magnitude and the direction of the induced EFM can be modulated by applying a current to the SWNTs.The concepts of electrical slip and no-slip are proposed and can be quantitatively described by "electrical slip resistance".This kind of generator does not need any magnet,rotor,etc and shows quite a different operating mechanism and design compared with a conventional large scale hydroelectric power generator.     

Aggregation of ferromagnetic and paramagnetic atoms at edges of graphenes and graphite

In this work we report that when ferromagnetic metals (Fe,Co and Ni) are thermally evaporated onto n-layer graphenes and graphite,a metal nanowire and adjacent nanogaps can be found along the edges regardless of its zigzag or armchair structure.Similar features can also be observed for paramagnetic metals,such as Mn,Al and Pd.Meanwhile,metal nanowires and adjacent nanogaps cannot be found for diamagnetic metals (Au and Ag).An external magnetic field during the evaporation of metals can make these unique features disappear for ferromagnetic and paramagnetic metal;and the morphologies of diamagnetic metal do not change after the application of an external magnetic field.We discuss the possible reasons for these novel and interesting results,which include possible one-dimensional ferromagnets along the edge and edge-related binding energy.     

Synthesis of high-TC ferromagnetic Mn-doped ZnO nanorods by thermal evaporation

This paper reports that a large amount of Mn-doped ZnO nanorods have been synthesized through thermal evaporation. The morphologies and properties are studied with x-ray diffraction, a scanning electron microscope, transmission electron microscope and Raman spectroscope. The results indicate that the manganese atoms occupy the zinc vacancies in the wurtzite lattice of ZnO without forming secondary phases. The exact manganese content has been studied by the x-ray fluorescence spectrum. Meanwhile, the magnetic moment versus temperature result proves that the as-prepared Mn-doped ZnO nanorods show ferromagnetic properties at temperatures as high as 400 K. These studies provide a good understanding of the origin of magnetic properties in diluted magnetic semiconductors.     

Synthesis of flower-shape clustering GaN nanorods by ammoniating Ga2O3 films

Flower-shape clustering GaN nanorods are successfully synthesized on Si（111） substrates through ammoniating Ga2O3/ZnO films at 950℃. The as-grown products are characterized by x-ray diffraction （XRD）, scanning electron microscope （SEM）, field-emission transmission electron microscope （FETEM）, Fourier transform infrared spectrum （FTIR） and fluorescence spectrophotometer. The SEM images demonstrate that the products consist of flower-shape clustering GaN nanorods. The XRD indicates that the reflections of the samples can be indexed to the hexagonal GaN phase and HRTEM shows that the nanorods are of pure hexagonal GaN single crystal. The photoluminescence （PL） spectrum indicates that the GaN nanorods have a good emission property. The growth mechanism is also briefly discussed.     

高效液相色谱定量测定降压乐的有效成分

降压乐片含去甲氧利血平和甲氯噻嗪两种成分,原料是美国ABBOTT药厂生产的。国外资料提供的含量测定方法是:“用两种不同牌号C_(18)色谱柱,两种流动相,两个内标物,两个检测波长分别测定两种成分。”操作麻烦,费时,成本高,本文利用反相分配色谱法,采用一根C_(18)色谱柱,以甲基炔诺酮为内标物,以甲醇为流动相,在254nm和225nm下分别测定甲氯噻嗪和去甲氧利血平的含量。本文采用的色谱系统:“C_(18)柱理论塔板数依内标物甲基炔诺酮峰计算应不低于一万。内标峰与甲氯噻嗪峰,去甲氧利血平峰分离度应不小于1.7。     

Thermal properties of single-walled carbon nanotube crystal

In this work, the thermal properties of a single-walled carbon nanotube (SWCNT) crystal are studied. The thermal conductivity of the SWCNT crystal is found to have a linear dependence on temperature in the temperature range from 1.9 K to 100.0 K. In addition, a peak (658 W/mK) is found at a temperature of about 100.0 K. The thermal conductivity decreases gradually to a value of 480 W/mK and keeps almost a constant in the temperature range from 100.0 K to 300.0 K. Meanwhile, the specific heat shows an obvious linear relationship with temperature in the temperature range from 1.9 K to 300.0 K. We discuss the possible mechanisms for these unique thermal properties of the single-walled carbon nanotube crystal.