Voids and Yolk鈥揝hells from Crystals That Coat Particles

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• 作者：Melinda Sindoro ; Steve Granick
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：October 1, 2014
• 年：2014
• 卷：136
• 期：39
• 页码：13471-13473
• 全文大小：243K
• ISSN：1520-5126

文摘

We investigate curvature-driven core鈥搒hell morphology that emerges when polycrystalline shells of ZIF-8 (zeolitic imidazolate framework coordination polymer) grow on colloid-sized particles. In early growth stages, the shell is continuous, but it transforms to yolk鈥搒hell, with neither sacrificial template nor core etching, because of geometrical frustration. A design rule is developed regarding how local surface curvature matters. Comparing shells grown on cubic, rod-like, and peanut-shaped hematite core particles, we validate the argument.