期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 367, 期 -, 页码 92-100出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.07.099
关键词
Hollow microspheres; Micro-mesoporosity; Magnetism; Ferrocenyl; Coordination polymers
Hollow magnetic microspheres with micro-mesoporous shells were constructed with layered cobalt-based ferrocenyl coordination polymers (Co-Fc-HCPS) through a one-step Ostwald ripening process. The diameters of microspheres and corresponding cavities were controlled in the range of several microns by tuning the reaction time and reactant concentration, which would attribute the microspheres with high loading, and enhanced mass diffusion and transfer efficiency. The high crystallinity of hollow microspheres allowed determination of the crystal structure of cobalt-based ferrocenyl coordination polymer, which crystallized in Brucite-type layered structure with the formula of Co-4(OH)(4)(FcDC)(2), (H(2)FcDC = 1,1'-ferrocenedicarboxylic acid), by combination of powder X-ray diffraction (PXRD), energy-dispersive X-ray spectroscopy (EDX), element analysis (EA), and Fourier transform infrared spectroscopy (FT-IR). N-2 adsorption/desorption investigation revealed the existence of both mesopores around 3.81 nm and micropores of ca. 1 nm in the shells. The hollow microspheres exhibited spin-canted antiferromagnetism with weak ferromagnetic ordering below similar to 52 K, which showed a remanent magnetization (Mr) of 1.0 mu(B) and a large coercive field (Hc) of 5 kOe at 7 K. (C) 2011 Elsevier Inc. All rights reserved.
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