Aluminum Nanoparticles Capped by Polymerization of Alkyl-Substituted Epoxides: Ratio-Dependent Stability and Particle Size

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• 作者：Douglas W. Hammerstroem ; Mark A. Burgers ; Stephen W. Chung ; Elena A. Guliants ; Christopher E. Bunker ; Katherine M. Wentz ; Sophia E. Hayes ; Steven W. Buckner ; Paul A. Jelliss
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：June 6, 2011
• 年：2011
• 卷：50
• 期：11
• 页码：5054-5059
• 全文大小：824K
• 年卷期：v.50,no.11(June 6, 2011)
• ISSN：1520-510X

文摘

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), ¹³C CPMAS (cross-polarization/magic-angle spinning), and ²⁷Al MAS solid-state NMR (nuclear magnetic resonance) measurements. The most stable aluminum nanoparticle鈥損olyether core鈥搒hell nanoparticles are found at an Al:monomer mole ratio of 10:1 with an active Al⁰ content of 94%.