疏水上转换纳米晶的均相体系聚合物包覆及在发光检测中的应用

发布时间：2019-01-03 08:27

【摘要】：选用水解的十八碳烯-马来酸酐共聚物(PMAO)为表面修饰分子,发展了一种以疏水纳米粒子吸附表面活性剂十二烷基磺酸钠(Na YF_4-SDS)为中间体的均一液相聚合物包覆纳米粒子方法.该方法解决了油溶性纳米晶与弱极性聚合物分子难以在单一体系下均匀分散的问题,实现了在均一液相体系下对疏水纳米晶的单分散包覆以及表面羧酸官能团修饰.红外光谱与表面Zeta电位测试结果表明纳米晶已被聚合物包覆,粒子表面为强电负性的羧酸基团.电镜结果表明聚合物包覆的上转换纳米晶粒径无明显的变化,具有良好的单分散性.发射光谱表明聚合物包覆前后粒子的发射谱带无显著变化,保持了原油相粒子的发光性能.进一步的特异性识别荧光显微成像实验证实聚合物包覆后的粒子(Na YF_4-PMAO)可用于生物学检测.
[Abstract]:The hydrolyzed octadecene maleic anhydride copolymer (PMAO) was chosen as the surface modified molecule. A homogeneous liquid-phase polymer coated nanoparticles was developed using hydrophobic nanoparticles as intermediates to adsorb surfactant sodium dodecyl sulfonate (Na YF_4-SDS). This method solves the problem that it is difficult for oil soluble nanocrystals and weakly polar polymer molecules to be uniformly dispersed in a single system. The monodisperse coating of hydrophobic nanocrystals and the modification of carboxylic acid functional groups on the surface are realized in homogeneous liquid phase system. Ir spectra and surface Zeta potential measurements show that nanocrystals have been coated with polymer and the surface of the particles is a strong electronegativity carboxylic group. The results of electron microscope showed that the particle size of polymer coated up-conversion nanocrystals had no obvious change and had good monodispersity. The emission spectra showed that the emission bands of the particles did not change significantly before and after the polymer coating, and the luminescence properties of the crude oil phase particles were maintained. Further specific recognition fluorescence microscopic imaging experiments confirmed that polymer coated particles (Na YF_4-PMAO) can be used for biological detection.
【作者单位】：浙江工业大学理学院应用物理系;中国科学院长春光学精密机械与物理研究所激发态重点实验室;
【基金】：国家自然科学基金(批准号:21305126) 浙江工业大学自然科学基金(批准号:2012XZ003)资助~~
【分类号】：O657.3;O631.3

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