哑铃型磁金介孔硅复合微球的制备及磁/光热催化性能测定

Preparation of Dumbbell-like Magnetic Gold Mesoporous Silicon Microspheres and Determination of Magnetic/Photo Thermo and Catalytic Performance

以金纳米粒为种子采取外延氧化生长氧化铁的方式,制备了哑铃型磁金纳米复合材料(Au-Fe3O4);以十六烷基三甲基溴化铵(CTAB)和F127为双模板剂通过溶胶凝胶法进一步包覆了介孔二氧化硅层(Au-Fe3O4@mSiO2)。所制备Au-Fe3O4纳米粒子呈哑铃型,单分散性较好,尺寸分布均一,粒径为12~15nm。Au-Fe3O4@mSiO2复合物磁热性能与浓度和外加磁场强度成正比;浓度为25mg·mL^-1时,磁场电流从25.5A增大到42.5A,溶液升温速率从0.39℃·min^-1增大到0.76℃·min^-1。Au-Fe3O4@mSiO2复合物光热性能与浓度和激光照射功率密度成正比;复合物浓度为25mg·mL^-1时,功率密度从0.3W·cm^-2增大到1.2W·cm^-2,溶液升温速率从0.69℃·min^-1增大到2℃·min^-1。相同浓度的复合物溶液,光热性能明显优于磁热性能。浓度为25mg·mL^-1的Au-Fe3O4@mSiO2复合物催化S-亚硝基谷胱甘肽(GSNO)释放NO的反应在60min时达到持续稳定释放,释放量最大为9.743μmol·L^-1。

For the sake of tumor diagnosis and treatment integration,the magnetic gold nanocomposite (Au-Fe3O4) with magnetic thermo,photo thermo,and catalysis properties,was prepared by epitaxial oxidation and growth of iron oxide with gold nanoparticles as seeds and coated with the mesoporous silica layer (Au-Fe3O4@mSiO2) using cetyltrimethyl ammonium bromide (CTAB) and F127 as two template agents by sol-gel method.The prepared Au-Fe3O4 nanoparticles were dumbbell type with good single dispersion,uniform size distribution and particle size of 12~15 nm.When the magnetic field current increased from 25.5 to 42.5 A,heating rate of the sample (25 mg·mL^-1) increased from 0.39 to 0.76 ℃·min^-1.When the laser density increased from 0.3 to 1.2 W·cm^-2,the temperature of the solution (25 mg·mL^-1) increased from 0.69 to 2 ℃·min^-1.Both the magneto thermal and photo thermal properties of Au-Fe3O4@mSiO2 composites were directly proportional to the concentration and the strength of the external magnetic field/ density of laser irradiation.The photo thermal property of the composite was better than that of magneto thermal property.The catalytic release of NO by the Au-Fe3O4@mSiO2 complex (25 mg·mL^-1 in S-nitrosoglutathione (GSNO)) reached a sustained and stable release within 60 min,with a maximum amount of 9.743 μmol·L^-1.