含偶氮基团的弯曲型分子的光谱特性研究

偶氮连接基团(—NN—)有着特殊的热化学和光化学行为,在适当波长光的照射下,能发生可逆的顺反异构反应,从而发生吸收波长的变化。在分子设计、光定位、光致变色和热致变色等方面,偶氮连接基团的非线性光化学性质都有着潜在的应用价值。文章以含有偶氮基作为侧翼的弯曲型分子作为研究对象,比较了弯曲型和直线型分子的吸收光谱;并用计算机模拟计算了弯曲型分子的角度,发现分子弯曲角和紫外可见吸收光谱存在着密切的关系。     

布里渊光时域反射传感系统数据采集模块的研制

分析了布里渊光时域反射传感系统的工作原理.讨论了传感系统性能与数据采集模块硬件性能的关系.设计了一个高速高精度的数据采集模块,其可以满足空间分辨率1 m、温度分辨率1 K以及应变分辨率20με的布里渊光时域反射传感系统的要求.     

In situ synthesis of nanostructured titania film on NiTi shape memory alloy by Fenton＇s oxidation method

Fenton＇s oxidation method was successfully used to synthesize an ideal titania film in situ on NiTi shape memory alloy（SMA） for medical applications. Characterized with scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, inductively coupled plasma mass spectrometry and electrochemical tests, it is found that the titania film produced by Fenton＇s oxidation method on NiTi SMA is nanostructured and has a Ni-free zone near its top surface, which results in a notable improvement in corrosion resistance and a remarkable decrease in leaching of harmful Ni ions from NiTi SMA in simulated body fluids. The improvement of effectiveness to corrosion resistance and the reduction in Ni release of NiTi SMA by Fenton＇s oxidation method are comparable to those by oxygen plasma immersion ion implantation reported earlier.