Journal
MATERIALS LETTERS
Volume 148, Issue -, Pages 17-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.02.077
Keywords
Composite materials; Core@double-shell microspheres; Magnetic materials; Noble metal; Metal organic frameworks
Funding
- National Natural Science Foundation of China [21173030, 21076030, 21476039]
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We demonstrate the preparation of sandwich structured microspheres containing Fe3O4 cores, inner silica shells, supported Pd nanoparticles and outer ZIF-8 shells. The synthesis involved first deposition of silica layer on magnetic cores through traditional StOber method and subsequent immobilization of Pd nanoparticles on the silica surface via grafting techniques, followed by the assembly of ZIF-8 shells over the Pd nanoparticles. Uniquely, the noble metal nanoparticles are sandwiched between the silica shell and porous ZIF-8 shell and such a configuration allows the metal nanoparticles to remain stable against aggregation and leaching while at the same time they are selectively accessible to the external environment outside of the ZIF-8 shells. Also, the resulting core@double-shell microspheres exhibit a superparamagnetic behavior with a high saturation magnetization of similar to 36.7 emu/g inheriting from the magnetic Fe3O4 cores. It is believed that the designed microspheres could find potential uses in heterogeneous catalysis and adsorption fields with excellent reusability and high efficiency. (C) 2015 Elsevier B.V. All rights reserved.
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