Sub-100 nm confinement of magnetic nanoparticles using localized magnetic field gradients.

Sub-100 nm confinement of magnetic nanoparticles using localized magnetic field gradients.
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使用局部磁场梯度将磁性纳米颗粒限制在 100 nm 以下。

DOI:
10.1021/ja0378308
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发表时间:
2003
影响因子:
15
通讯作者:
Whitesides,GeorgeM
Whitesides,GeorgeM
中科院分区:
化学1区
文献类型:
--
作者:
Urbach,AdamR;Love,JChristopher;Prentiss,MaraG;Whitesides,GeorgeM

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含有抗磁性金属薄片的铁磁棒产生强烈的磁场梯度,吸引磁性纳米粒子并将其限制在小至20纳米的空间区域内。该棒(直径80 nm)由电沉积在多孔聚碳酸酯膜上形成的CoNi (~ 350 nm)和Au (20 ~ 160 nm)的交替截面组成。在对棒进行磁化后,在铁磁部分和反磁部分的边界处形成较大的磁梯度(106 ~ 107T/m)。这些梯度吸引并限制了磁性纳米颗粒在磁棒周围的空间。这种方法提供了一种新的工具,通过设计来产生强烈的、高度局部化的磁场梯度,并将磁性纳米颗粒限制在这些梯度中。
Ferromagnetic rods containing thin sections of diamagnetic metal create intense magnetic field gradients that attract and confine magnetic nanoparticles to regions of space as small as 20 nm. The rods (80 nm diameter) comprised alternating sections of CoNi (∼350 nm) and Au (20−160 nm) formed by electrodeposition into porous polycarbonate membranes. Upon magnetizing the rods, large magnetic gradients (106−107T/m) form at the boundaries between ferromagnetic and diamagnetic sections. These gradients attract and confine magnetic nanoparticles to attoliter volumes of space surrounding the rod. This method provides a new tool for generating intense, highly localized magnetic field gradients, by design, and confining magnetic nanoparticles in these gradients.
DOI: --
发表时间: 1984
影响因子: 6.3
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