Department of Chemistry, Saint Louis University, 3501 Laclede Avenue, Saint Louis, Missouri 63103, USA.
Inorg Chem. 2011 Jun 6;50(11):5054-9. doi: 10.1021/ic2003386. Epub 2011 May 12.
We report here on the polymerization of epoxide monomers on incipient aluminum nanoparticle cores and the effects of changing the epoxide-capping precursor and the metallic monomer ratio on the resultant stability and particle size of passivated and capped aluminum nanoparticles. When altering the ratio of aluminum to cap monomer precursor, nanoparticles capped with epoxydodecane, epoxyhexane, and epoxyisobutane show a clear decreasing trend in stability with decreasing alkane substituent length. The nanoparticle core size was unaffected by cap ratio or composition. PXRD (powder X-ray diffraction) and DSC/TGA (differential scanning calorimetry/thermal gravimetric analysis) confirm the presence of successfully passivated face-centered cubic (fcc) aluminum nanoparticles. We also report preliminary results from ATR-FTIR (attenuated total reflectance-Fourier transform infrared), (13)C CPMAS (cross-polarization/magic-angle spinning), and (27)Al MAS solid-state NMR (nuclear magnetic resonance) measurements. The most stable aluminum nanoparticle-polyether core-shell nanoparticles are found at an Al:monomer mole ratio of 10:1 with an active Al(0) content of 94%.
我们在此报告关于环氧化物单体在初生铝纳米颗粒核上的聚合反应，以及改变环氧化物封端前体和金属单体比例对稳定化和封端铝纳米颗粒粒径的影响。当改变铝与帽单体前体的比例时，用环氧十二烷、环氧己烷和环氧异丁烷封端的纳米颗粒的稳定性随着烷烃取代基长度的减少而呈现明显的下降趋势。纳米颗粒核的大小不受帽比或组成的影响。PXRD（粉末 X 射线衍射）和 DSC/TGA（差示扫描量热法/热重分析）证实了成功钝化的面心立方（fcc）铝纳米颗粒的存在。我们还报告了来自 ATR-FTIR（衰减全反射-傅里叶变换红外）、（13）C CPMAS（交叉极化/魔角旋转）和（27）Al MAS 固态 NMR（核磁共振）测量的初步结果。在 Al:单体摩尔比为 10:1 时，具有 94%的活性 Al(0)含量的最稳定的铝纳米颗粒-聚醚核壳纳米颗粒被发现。
