Dept. of Chemistry, University of Rome Sapienza, P.le A. Moro, 5, 00185 Rome, Italy.
J Colloid Interface Sci. 2010 Aug 15;348(2):424-30. doi: 10.1016/j.jcis.2010.04.061. Epub 2010 Apr 28.
A modified emulsion copolymerization of phenylacetylene (PA) with hydrophilic monomers having different functions, i.e., acrylic acid (AA) and N,N-dimethylpropargylamine (DMPA) respectively, yields functionalized polymeric P(PA-co-AA) and P(PA-co-DMPA) nanoparticles. The systematic investigation on the experimental parameters affecting size, surface charge and polydispersity of the copolymers (initiator concentration, reaction time, cosolvent and PA/comonomer ratios) allows to modulate the nanoparticle physico-chemical properties. Spherical shaped particles with diameters in the range 80-500 nm, low polydispersity (PI values in the range 1.11-1.30) and different surface charge densities, between 0.44 and 2.87 microC/cm(2), have been consistently obtained and characterized by means of Dynamic Light Scattering (DLS), laser Doppler electrophoretic and Scanning Electron Microscopy (SEM) studies. XPS measurements have provided information on the nanoparticles chemical surface structure and suggest that AA and DMPA units are preferentially distributed on the surface of the spheres. The nanospheres self-assemble giving large domains (9.5 x 14.5 microm). Photonic analysis of the self-assembled copolymeric nanoparticles has been performed by means of Spectroscopic Ellipsometry (SE) and Bragg reflection spectroscopy, both of them demonstrating a three-dimensional photonic crystal property of these systems.
采用苯基乙炔（PA）与具有不同功能的亲水性单体（即丙烯酸（AA）和 N，N-二甲基丙烯酰胺（DMPA））进行改良乳液共聚，得到功能化的聚合 P（PA-co-AA）和 P（PA-co-DMPA）纳米粒子。系统研究了影响共聚物尺寸、表面电荷和多分散性的实验参数（引发剂浓度、反应时间、共溶剂和 PA/单体比），从而可以调节纳米粒子的物理化学性质。通过动态光散射（DLS）、激光多普勒电泳和扫描电子显微镜（SEM）研究，得到了直径在 80-500nm 之间、多分散性低（PI 值在 1.11-1.30 之间）和不同表面电荷密度（0.44 到 2.87 微 C/cm(2)）的球形粒子，并对其进行了表征。XPS 测量提供了关于纳米粒子化学表面结构的信息，并表明 AA 和 DMPA 单元优先分布在球体的表面。纳米球自组装形成大的畴（9.5 x 14.5 微米）。通过光谱椭圆术（SE）和布拉格反射光谱对自组装共聚物纳米粒子进行了光子分析，两者均证明了这些系统具有三维光子晶体特性。
