Taking the temperature of the interiors of magnetically heated nanoparticles.
Taking the temperature of the interiors of magnetically heated nanoparticles.
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DOI：
10.1021/nn501250e
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发表时间：
2014-05-27
期刊：
影响因子：
17.1
通讯作者：
Zink, Jeffrey I.
中科院分区：
文献类型：
--
作者：
Dong, Juyao;Zink, Jeffrey I.
关键词：
使用晶体光学纳米温度计测量在振荡磁场中由封装的较小超顺磁性纳米晶体引起的介孔二氧化硅纳米粒子内部的温度升高。检测机制基于 NaYF4:Yb3+、Er3+ 上转换发射光谱中两个发光带的温度依赖性强度比。开发了一种简便的逐步相转移方法来构建内部包含纳米加热器和纳米温度计的双核介孔二氧化硅纳米粒子。纳米粒子内部的磁感应加热随不同的实验条件而变化，包括磁场感应功率、暴露于磁场的时间和磁性纳米晶体尺寸。在磁振荡场暴露期间，连续监测磁性纳米晶体周围的直接纳米环境的温度升高。纳米粒子的内部变得比宏观溶液热得多，并在磁场关闭后在几秒的时间内冷却到环境流体的温度。这种连续绝对温度检测方法提供了对磁性材料周围纳米环境的定量洞察，并为优化物理和生物医学应用的局部温度控制开辟了道路。
The temperature increase inside mesoporous silica nanoparticles induced by encapsulated smaller superparamagnetic nanocrystals in an oscillating magnetic field is measured using a crystalline optical nanothermometer. The detection mechanism is based on the temperature-dependent intensity ratio of two luminescence bands in the upconversion emission spectrum of NaYF4:Yb3+, Er3+. A facile stepwise phase transfer method is developed to construct a dual-core mesoporous silica nanoparticle that contains both a nanoheater and a nanothermometer in its interior. The magnetically induced heating inside the nanoparticles varies with different experimental conditions, including the magnetic field induction power, the exposure time to the magnetic field, and the magnetic nanocrystal size. The temperature increase of the immediate nanoenvironment around the magnetic nanocrystals is monitored continuously during the magnetic oscillating field exposure. The interior of the nanoparticles becomes much hotter than the macroscopic solution and cools to the temperature of the ambient fluid on a time scale of seconds after the magnetic field is turned off. This continuous absolute temperature detection method offers quantitative insight into the nanoenvironment around magnetic materials and opens a path for optimizing local temperature controls for physical and biomedical applications.
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