Wong Jia Chyi, Xiang Li, Ngoi Kuan Hoon, Chia Chin Hua, Jin Kyeong Sik, Ree Moonhor
Materials Science Program, School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Department of Chemistry, Polymer Research Institute, and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea.
Polymers (Basel). 2020 Feb 19;12(2):477. doi: 10.3390/polym12020477.
A series of polystyrene nanoparticles (PS-1, PS-2, PS-3, and PS-4) in aqueous solutions were investigated in terms of morphological structure, size, and size distribution. Synchrotron small-angle X-ray scattering analysis (SAXS) was carried out, providing morphology details, size and size distribution on the particles. PS-1, PS-2, and PS-3 were confirmed to behave two-phase (core and shell) spherical shapes, whereas PS-4 exhibited a single-phase spherical shape. They all revealed very narrow unimodal size distributions. The structural parameter details including radial density profile were determined. In addition, the presence of surfactant molecules and their assemblies were detected for all particle solutions, which could originate from their surfactant-assisted emulsion polymerizations. In addition, dynamic light scattering (DLS) analysis was performed, finding only meaningful hydrodynamic size and intensity-weighted mean size information on the individual PS solutions because of the particles' spherical nature. In contrast, the size distributions were extracted unrealistically too broad, and the volume- and number-weighted mean sizes were too small, therefore inappropriate to describe the particle systems. Furthermore, the DLS analysis could not detect completely the surfactant and their assemblies present in the particle solutions. Overall, the quantitative SAXS analysis confirmed that the individual PS particle systems were successfully prepared with spherical shape in a very narrow unimodal size distribution.
对一系列水溶液中的聚苯乙烯纳米颗粒（PS-1、PS-2、PS-3和PS-4）进行了形态结构、尺寸和尺寸分布方面的研究。进行了同步加速器小角X射线散射分析（SAXS），提供了颗粒的形态细节、尺寸和尺寸分布。PS-1、PS-2和PS-3被确认为具有两相（核和壳）球形，而PS-4呈现单相球形。它们都显示出非常窄的单峰尺寸分布。确定了包括径向密度分布在内的结构参数细节。此外，在所有颗粒溶液中都检测到了表面活性剂分子及其聚集体，这可能源于它们的表面活性剂辅助乳液聚合。此外，进行了动态光散射（DLS）分析，由于颗粒的球形性质，仅在各个PS溶液中获得了有意义的流体动力学尺寸和强度加权平均尺寸信息。相比之下，提取的尺寸分布不切实际地过宽，体积加权平均尺寸和数量加权平均尺寸过小，因此不适用于描述颗粒系统。此外，DLS分析无法完全检测到颗粒溶液中存在的表面活性剂及其聚集体。总体而言，定量SAXS分析证实，各个PS颗粒系统已成功制备成具有非常窄的单峰尺寸分布的球形。
