Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga, 840-8502, Japan.
Nanoscale. 2011 Nov;3(11):4768-73. doi: 10.1039/c1nr10804b. Epub 2011 Oct 14.
Polymeric micelles with core-shell-corona architecture have been found to be the efficient colloidal templates for synthesis of periodic organosilica hollow nanospheres over a broad pH range from acidic to alkaline media. In alkaline medium, poly (styrene-b-[3-(methacryloylamino)propyl] trimethylammonium chloride-b-ethylene oxide) (PS-PMAPTAC-PEO) micelles yield benzene-silica hollow nanospheres with molecular scale periodicity of benzene groups in the shell domain of hollow particles. Whereas, an acidic medium (pH 4) produces diverse hollow particles with benzene, ethylene, and a mixture of ethylene and dipropyldisulfide bridging functionalities using poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-PVP-PEO) micelles. These hollow particles were thoroughly characterized by powder X-ray diffraction (XRD), dynamic light scattering (DLS), thermogravimetric analysis (TG/DTA), Fourier transformation infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), magic angle spinning-nuclear magnetic resonance ((29)Si MAS NMR and (13)CP-MAS NMR), Raman spectroscopy, and nitrogen adsorption/desorption analyses. The benzene-silica hollow nanospheres with molecular scale periodicity in the shell domain exhibit higher cycling performance of up to 300 cycles in lithium ion rechargeable batteries compared with micron-sized dense benzene-silica particles.
具有核壳冠层结构的聚合物胶束已被发现是在从酸性到碱性的宽 pH 范围内合成周期性有机硅中空纳米球的有效胶体模板。在碱性介质中，聚（苯乙烯-b-[3-（丙烯酰基氨基）丙基]三甲基氯化铵-b-氧化乙烯）（PS-PMAPTAC-PEO）胶束生成具有苯基团在中空粒子壳域中分子级周期性的苯-硅中空纳米球。然而，在酸性介质（pH 4）中，使用聚（苯乙烯-b-2-乙烯基吡啶-b-氧化乙烯）（PS-PVP-PEO）胶束生成具有苯、乙烯以及苯、乙烯和二丙基二硫桥接官能团的各种中空粒子。这些中空粒子通过粉末 X 射线衍射（XRD）、动态光散射（DLS）、热重分析（TG/DTA）、傅里叶变换红外（FTIR）光谱、透射电子显微镜（TEM）、魔角旋转-核磁共振（(29)Si MAS NMR 和 (13)CP-MAS NMR）、拉曼光谱和氮气吸附/解吸分析进行了彻底的表征。与微米级致密苯-硅粒子相比，在壳域中具有分子级周期性的苯-硅中空纳米球在锂离子可再充电电池中表现出高达 300 次循环的更高循环性能。
