Magnetic inorganic hollow compound microsphere and preparation method thereof

Abstract

The invention belongs to the field of advanced nanometer composite material technique, in particular to a magnetic inorganic hollow composite micro-ball and a preparation method thereof. The method of the invention comprises the steps as follows: firstly, by a solvent volatilization method, the co-deposition of magnetic nanometer particles and polymer micro-balls is generated so as to lead the magnetic nanometer particle to be filled into the gap of the polymer micro-ball; subsequently, by a nanometer pouring method, inorganic oxide sol is filled into the residual space of the polymer micro-ball gap; by inorganic oxide sol hydrolysis, the inorganic oxide enwraps the magnetic nanometer particle and covers around the polymer micro-ball; furthermore, the polymer micro-ball is removed by sintering so as to obtain the metal oxide composite hollow micro-ball with the shell doped with magnetic nanometer particles. The micro-ball can be dispersed in the water solution by supersonic oscillation. The magnetic hollow ball has stronger magnetic saturated strength and higher mechanical stability, has wide application on the aspects of biology separation, medicament transport, and catalyst load, etc. The method of the invention is simple, the raw material is easy to be obtained and the method of the invention is applicable for amplification production.

Description

technical field [0001] The invention belongs to the field of advanced nanocomposite materials and nanotechnology, in particular to a magnetic composite microsphere with a hollow structure and a synthesis method thereof. technical background [0002] In recent years, hollow microspheres have become a new type of composite material with wide application prospects due to their special structure. Hollow microspheres with walls doped with magnetic materials have broad application prospects in bioseparation, drug transport, catalytic loading, etc. [0003] So far, there have been some reports on the synthesis of magnetic hollow microspheres, but in the existing reports, the synthesized hollow microspheres have shortcomings such as poor magnetic response, uneven shape of composite materials, and poor mechanical strength. (White, S.R.; Sottos, N.R.; Geubelle, P.H.; Moore, J.S.; Kessler, M.R.; Sriram, S.R.; Brown, E.N.; Viswanathan, S.Nature 2001, 409, 794. Qiao, R.; Zhang, X.L.; Qi...

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Problems solved by technology

However, its synthesis steps involve repeated wrapping and multiple centrifugation processes, making the synthesis route cumbersome and time-consuming, and the polyelectrolytes required in its synthesis are expensive and difficult to apply to large-scale synthesis

So far, there is no report (Caruso, F.; Lichtenfeld, H.; Giersig, M.; Mohwald, H.J.Am.Chem.Soc.1998 about the facile synthesis of inorganic hollow microspheres with strong magnetic responsiveness , 120, 8523. Caruso, F.; Caruao, R.A.; Mohwald, H. Science 1998, 282, 1111. Caruso, F.; Spasova, M.; Susha, A.; Giersig, M.; Caruso, R.A. Chem. Mater. 2001, 13, 109.)

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