A general and mild route to highly dispersible anisotropic magnetic colloids for sensing weak magnetic fields
A general and mild route to highly dispersible anisotropic magnetic colloids for sensing weak magnetic fields
复制标题
用于感测弱磁场的高分散各向异性磁胶体的通用且温和的途径
DOI：
10.1039/c8tc00263k
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发表时间：
2018-05
影响因子：
6.4
通讯作者：
Zhang Xiaohong
中科院分区：
文献类型：
--
作者：
Zhang Shumin;Li Chaoran;Yu Yingying;Zhu Zhijie;Zhang Weihu;Tang Rujun;Sun Wei;Xie Wenhe;Li Yunxing;Yu Jia;He Le;Zhang Xiaohong
制备形状可控、胶体分散性好的各向异性磁性纳米粒子的研究越来越受到人们的关注。在这里，我们报道了一种通用而温和的方法，通过低温转化非磁性模板来制备高度分散的各向异性磁性胶体。我们的策略的关键是用一层多孔二氧化硅来修饰模板表面，以提供保持整体形貌所需的空间受限环境，并提高在较低温度下转化所需的壳层渗透性。在较温和的条件下转化，不仅对提高能源和成本效益具有重要的实际意义，而且还可以通过减少团聚来制备具有良好胶体分散性的磁性粒子。我们证明了这种方法在多孔-二氧化硅保护的不同样品(包括α-Fe_2O_3和FeO_2O_3)转化为具有良好胶体分散性的各向异性磁性粒子中的普遍性。基于高度分散的各向异性磁性粒子，我们还展示了用于探测比地球磁场高一个数量级的极弱磁场的响应性光子晶体的制备。我们的研究为各向异性磁性纳米粒子在自组装、催化、光子晶体、液晶、生物医学和制药等领域的新应用奠定了基础。
There has been growing interest in the preparation of anisotropic magnetic nanoparticles with well-controlled shapes and excellent colloidal dispersity. Here we report a general and mild approach for the preparation of highly dispersible anisotropic magnetic colloids through the low-temperature conversion of nonmagnetic templates. The key of our strategy is to modify the template surface with a layer of porous silica to provide a spatially confined environment necessary for the preservation of the overall morphology and improve the shell permeability necessary for the conversion at lower temperatures. The conversion under milder conditions not only is of practical importance for improving energy and cost-effectiveness but also produces magnetic particles with excellent colloidal dispersity by alleviating aggregation. We demonstrate the universality of this approach in the porous-silica-protected conversion of different samples including α-Fe2O3 and FeOOH into anisotropic magnetic particles with excellent colloidal dispersity. Based on highly dispersible anisotropic magnetic particles, we also demonstrate the fabrication of responsive photonic crystals for detecting very weak magnetic fields that are one order of magnitude higher than the earth magnetic field. Our study paves the way for new applications of anisotropic magnetic nanoparticles in self-assembly, catalysis, photonic crystals, liquid crystals, biomedicine and pharmaceutics.
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影响因子：
3.2
作者：
M. Klank;O. Hagedorn;M. Shamonin;H. Dötsch
通讯作者：
M. Klank;O. Hagedorn;M. Shamonin;H. Dötsch
DOI：
10.1021/la2026768
发表时间：
2011-10
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Le He;Yongxing Hu;Xiaogang Han;Yu Lu;Zhenda Lu;Yadong Yin
通讯作者：
Le He;Yongxing Hu;Xiaogang Han;Yu Lu;Zhenda Lu;Yadong Yin
影响因子：
--
作者：
Mingsheng Wang;Le He;Wenjing Xu;Xin Wang;Yadong Yin
通讯作者：
Mingsheng Wang;Le He;Wenjing Xu;Xin Wang;Yadong Yin
影响因子：
17.1
作者：
He, Le;Hu, Yongxing;Yin, Yadong
通讯作者：
Yin, Yadong
影响因子：
7
作者：
Huang, Wei;Xiao, Xinxin;Chi, Qijin
通讯作者：
Chi, Qijin