己内酰胺在碳纤维表面的电聚合改性

采用循环伏安法,以己内酰胺为聚合单体对碳纤维进行电聚合改性。利用循环伏安特性曲线、傅里叶变换红外光谱、电脑伺服控制材料试验机、扫描电镜(SEM)研究了改性前后碳纤维及其复合材料表面结构与性能的变化。结果表明,当己内酰胺浓度为0.1 mol/L,循环次数为10次时,碳纤维的改性效果较佳;改性后的碳纤维在1650 cm^(-1)出现NH_2的变角振动吸收峰,1556 cm^(-1),1540 cm^(-1)出现羧酸COO反对称伸缩吸收峰;能谱测试发现碳纤维表面O含量增加了1.69%;复合材料的层间剪切强度(ILSS)由10.50 MPa增加到26.96 MPa,提高了156.70%;SEM图表明改性后碳纤维表面生成分散均匀的颗粒且具有一定厚度的聚合物涂层,与复合材料结合紧密且无拔出现象。

Multilayered polyelectrolyte-coated gold nanorods as multifunctional optical contrast agents for cancer cell imaging

We report the application of multilayered polyelectrolyte-coated gold nanorods(GNRs) as multifunctional optical contrast agents for cancer cell imaging.The surface modification of GNRs improves their chemical stability and facilitates them to be taken up by cancer cells through electrostatic interaction.The unique longitudinal surface plasmon resonance property of GNRs makes them suitable as both "scattering contrast agents" and "Raman contrast agents".In our experiments,the staining of GNRs in cells was further confirmed by dark field microscopy and Raman microscopy.Our experiment results indicated that GNRs have great potential as multifunctional "optical contrast agents" for future in vivo animal imaging.