Zhao Hai-Feng, Xiong Wan-Bin, Huang Xiao-Hua, Chen Ming-Qing
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Jan;29(1):172-5.
In the present paper, the preparation and properties of Eu(III) on poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AAc)) were described. At first, P(NIPAM-co-AAc) microgel nanoparticles were prepared by the precipitation copolymerization of N-isopropylacrylamide with acrylic acid in the presence of N, N-methylenebisacrylamide in water. The morphology and size of the P(NIPAM-co-AAc) nanoparticles were characterized by the scanning electron microscope (SEM) method. The result of SEM shows that the sample is uniformly sized spherical particle and the average particle size of the P(NIPAM-co-AAc) is about 365 nm. Then, EuCl3 was chosen to interact with P(NIPAM-co-AAc) nanoparticles and formed the complex of P(NIPAM-co-AAc)-Eu(III). The complex was characterized by Fourier transform infrared spectroscopy, ultraviolet-visible and fluorescence spectroscopy. It was found that the complex shows thermo-responsive fluorescence from the experimental results. There exists a energy transfer between the polymer ligand and the Eu(III), which can enhance fluorescence emission of the polymer ligand and Eu(III) at the same time. The LCST of P(NIPAM-co-AAc) containing Eu(III) has changed little after the formation of the complex of P(NIPAM-co-AAc)-Eu(III). Therefore, the complex can be used for developing the new applications in biomedical and fluorescence field.
本文描述了铕（III）在聚（N-异丙基丙烯酰胺-共-丙烯酸）（P（NIPAM-co-AAc））上的制备及其性质。首先，在水相中，以N，N-亚甲基双丙烯酰胺为交联剂，通过N-异丙基丙烯酰胺与丙烯酸的沉淀共聚反应制备了P（NIPAM-co-AAc）微凝胶纳米颗粒。采用扫描电子显微镜（SEM）法对P（NIPAM-co-AAc）纳米颗粒的形貌和尺寸进行了表征。SEM结果表明，样品为尺寸均匀的球形颗粒，P（NIPAM-co-AAc）的平均粒径约为365nm。然后，选择EuCl3与P（NIPAM-co-AAc）纳米颗粒相互作用，形成P（NIPAM-co-AAc）-Eu（III）配合物。通过傅里叶变换红外光谱、紫外-可见光谱和荧光光谱对该配合物进行了表征。实验结果表明，该配合物具有热响应荧光特性。聚合物配体与Eu（III）之间存在能量转移，可同时增强聚合物配体和Eu（III）的荧光发射。P（NIPAM-co-AAc）-Eu（III）配合物形成后，含Eu（III）的P（NIPAM-co-AAc）的最低临界溶液温度变化不大。因此，该配合物可用于开发生物医学和荧光领域的新应用。
