宽X射线防护稀土/聚丙烯纤维的制备与性能

以稀土氧化镧、氧化铕、氧化镱作为射线屏蔽剂,采用KH-560对稀土进行有机改性,通过密炼机将稀土和聚丙烯(PP)共混,然后对共混物进行熔融纺丝,得到了单一稀土填充以及稀土并用填充的复合纤维。采用红外光谱、差示扫描量热、X射线衍射、扫描电子显微镜等方法对所得纤维进行结构性能表征,并将短纤维层压作防辐射测试。实验结果表明,改性后的稀土氧化物在聚丙烯基体中分散更均匀。当稀土填充总量一样时,在各铅当量测试电压下,3种稀土氧化物并用复合材料的P值都比单一稀土氧化物复合材料的P值高,当测试电压为90 keV时,3种稀土氧化物并用复合材料的P值比氧化镱稀土复合材料的P值高37.2%。当铅当量测试电压范围为80～120 keV时,3种稀土氧化物并用复合材料的P值可达到0.5 mmPb/(g·cm^(-2))。

Enhanced absorption of Ag diamond-type nanoantenna arrays

The optical metal nanoantenna on thin film solar cell is effective to enhance light absorption. In this paper, the diamond-type Ag nanoantenna arrays are proposed for increasing the efficiency of solar cells by localized surface plasmons resonance(LSPR). The effect of metal nanoantenna on the absorption enhancement is theoretically investigated by the finite difference time domain(FDTD) method. Broadband absorption enhancements in both visible and near-infrared regions are demonstrated in case of solar cell with diamond-type Ag nanoantennas. The spectral response is manipulated by geometrical parameters of the nanoantennas. The maximum enhancement factor of 1.51 for solar cell is obtained. For comparison, the other three nanoantennas are also analyzed. The results show that the solar cell with optimized diamond-type nanoantenna arrays is more efficient in optical absorption.