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Fe3O4 @SiO2 core–shell-structured nanoparticles are expected to act as nanoabsorbents or nanocarriers because of the magnetic properties of the internal Fe3O4 and the inherent properties of the external SiO2. Plasmid DNA, a small class of nucleic acid, is isolated and purified by the SiO2 surface of magnetic beads. Improvement of the specific surface area of the SiO2 coating layer under specified...
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