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Chemical Design of DyPrFeCoB-Alloy-Based Microtweezers
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques ( IF 0.5 ) Pub Date : 2021-04-21 , DOI: 10.1134/s1027451021020063
O. V. Koplak , E. V. Dvoretskaya , V. L. Sidorov , N. N. Dremova , I. V. Shashkov , D. V. Korolev , R. A. Valeev , V. P. Piskorski , R. B. Morgunov

Abstract

Using selective dissolution, we create α-Fe/DyPrFeCoB microwires with a parabolic tip for focusing the magnetic flux and enhancing the magnetic attraction of particles. The conditions for sharpening the end of the microwire by etching with HNO3 and with mixtures of HNO3 + HCl and H2SO4 + HNO3 are also optimized. The magnetic force of a single microwire with a pointed end (up to 880 pN) makes it possible to capture and hold a DyPrFeCoB microparticle with a size of 1 µm in the region of ~5 µm. A significant magnetic-field gradient (up to ~3.5 × 105 T/m), created at the tip of the microwire, is sufficient to affect biological processes inside cells even without magnetic markers. The conditions for the attachment/detachment of a magnetic microparticle are controlled by the exchange bias arising at the interface between the α-Fe ferromagnetic core and the PrDyFeCoB ferrimagnetic shell and by four magnetic states of the microwire, which are switched by a weak external uniform magnetic field of ~0.1–2 kA/m.



中文翻译:

基于DyPrFeCoB合金的微镊子的化学设计

摘要

使用选择性溶解,我们创建了具有抛物线形尖端的α-Fe/ DyPrFeCoCoB微线,用于聚焦磁通量并增强粒子的磁引力。还优化了通过用HNO 3以及HNO 3 + HCl和H 2 SO 4 + HNO 3的混合物进行蚀刻来使微丝末端变尖锐的条件。具有尖端(最大880 pN)的单根微线的磁力使得可以捕获和固定大小约为1 µm的DyPrFeCoCoB微粒,其粒径约为5 µm。明显的磁场梯度(高达〜3.5×10 5即使在没有磁性标记的情况下,在微丝尖端产生的T / m也足以影响细胞内的生物过程。磁性微粒的附着/脱离条件由在α-Fe铁磁芯和PrDyFeCoB亚铁壳之间的界面处产生的交换偏压以及微丝的四个磁性状态控制,这些状态由弱的外部均匀性来切换磁场为〜0.1–2 kA / m。

更新日期:2021-04-21
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