“Preparation, Structure, and Imaging of Luminescent SiO2 Nanoparticles by Covalently Grafting Surfactant-Encapsulated Europium-Substituted Polyoxometalates” Yuanyuan Zhao, Yue Li, Wen Li, Yuqing Wu, Lixin Wu*, Langmuir, 2010, 26(23), 18430–18436. (IF=4.268)