Synthesis of bifunctional core–shell particles with a porous zeolite core and a responsive polymeric shell
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The aim of our work is the synthesis and characterization of colloidal core–shell particles with a zeolite core and an environmentally responsive shell. We have synthesized colloidal ZSM-5 zeolite and modified the surface with 3-(trimethoxysilyl)propyl methacrylate in order to introduce double bonds at the surface. The cross-linked polymeric shell was prepared by precipitation polymerization using the functionalized zeolite particles as seeds. We employed thermoresponsive poly(N-isopropylacrylamide) and pH-responsive poly(vinylpyridine) as the polymeric shell, respectively. The temperature- and pH-depending swelling and deswelling of the core–shell particles were characterized with dynamic light scattering techniques. Transmission electron microscopy pictures show the morphology of the synthesized particles. It is proposed that these types of bifunctional core–shell particles could be of use for controlled uptake and release applications and separation of molecules.
KeywordsZeolite Hydrogel Temperature-responsive pH-responsive Core–shell particles
The authors gratefully acknowledge the financial support of the DFG, SPP 1259 “Intelligente Hydrogele” (STO 643/4), and Prof. T. Bein and S. Schmidt (Ludwig-Maximilians-Universität München, Germany) for providing the TEM images.
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