介孔结构增强的Fe3O4超粒子@介孔SiO2的光热性能

采用湿化学法制备了多功能Fe₃O₄超粒子@介孔SiO₂复合材料.该纳米复合材料具有超顺磁性，在商用磁铁下可实现快速富集、分离.SiO₂的包覆增强了Fe₃O₄超粒子在近红外光区的吸收，提高了其光热性能；介孔结构的构建提高了近红外光的利用率，进一步提升了纳米复合物的光热性能，且介孔SiO₂的壳层越厚，光热性能越优.细胞实验结果表明，Fe₃O₄超粒子@介孔SiO₂在近红外光照射下具有较高的癌细胞杀伤能力.

Mesoporous-structure Enhanced Photothermal Effect of Fe3O4 Superparticles@mesoporous Silica

Fe₃O₄ superparticles@mesoporous SiO₂(Fe₃O₄SPs@mSiO₂) were synthesized by the wet chemical method. The nanocomposites exhibited superparamagnetic property. They can rapidly accumulate near a commercial permanent magnet and redisperse in the aqueous solution with gently shaking. The absorption of Fe₃O₄SPs@mSiO₂ in the near-infrared region was increased due to the coating of SiO₂. And thus, their photothermal effect was improved. The construction of mesoporous structure facilitated to raise the utilization of near-infrared light, resulting in a further improvement of the photothermal performance of the nanocomposites. Moreover, the thicker the shell of the mesoporous SiO₂ was, the superior the photothermal effect of the nanocomposites became. The vitro cell experiments confirmed that Fe₃O₄SPs@mSiO₂ can effectively kill the cancer cells under the near infrared light irradiation.