Preparation of Size-controllable Magnetic Mesoporous Carbons and Their Relaxation Properties
CAI Guang1,2, LI Lin1, WANG Rong1, CHEN Yanqiu1, CHEN Maolong1, CHENG Yunhui1, DING Li1, XU Zhou1
1 School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, China 2 Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Abstract: In recent years, magnetic mesoporous carbons (MMCs) have shown great application prospects in the fields of medical imaging, drug transportation and biosensing. Firstly, metal-organic frameworks (MOFs) with controllable particle sizes in the range of 60~330 nm were prepared via controlled crystal growth method by controlling the number of growths, Then,they were calcined at a specific temperature in N2 atmosphere to prepare the MMCs with controllable particle sizes in the range of 220—310 nm successfully. The changes of microstructure, dispersion, chemical structure and functional group as well as relaxation property were studied by TEM, DLS, FTIR and proton transverse relaxation rate. The results show that the proton transverse relaxation rate of MMCs after calcination is nearly 12—48 times higher than that of the MOFs precursor, and the proton transverse relaxation rate of MMCs with different particle sizes increases with the increase of particle sizes. The MMCs with an average size of 310 nm have the largest transverse relaxation rate of 34.205 mM-1·s-1.
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2020, Vol. 34 
