Question

求高手帮忙翻译 谢谢!!!

磁性纳米粒子通过表面共聚和表面改性的方法，能与有机物或高分子聚合物或无机材料相结合，形成核-壳结构的磁性复合微球。它既具有磁性，又具有表面活性基团，能进一步和细胞、酶、蛋白质、抗体及核酸等多种生物分子偶联。在外加磁场的作用下，磁性粒子能够很方便地和底液分离，具有操作简便和分离效率高的优点。

本文用化学共沉淀方法制备Fe3O4磁性纳米粒子，通过多组不同条件的对比实验，并用X射线衍射（XRD），扫描电镜（SEM）进行表征，制备出粒径较单一的纳米粒子。由于金属氧化物纳米粒子的表面存在大量的-OH，可以与带-COOH的手性酸反应，故本实验用手性异戊酸对Fe3O4磁性纳米粒子进行了表面修饰，通过XRD，SEM对修饰后的Fe3O4磁性纳米粒子的形貌进行表征证实，这样可以使Fe3O4磁性纳米粒子具有手性，并且大大提高了其分散性。

磁性粒子由于可以受到外加磁场控制，因而具有良好的靶向性。将表面进行手性酸修饰了的Fe3O4磁性纳米粒子均匀分散在胆甾相液晶中制备成Fe3O4磁性纳米粒子/液晶复合体系，它在一定条件下具有一定的稳定性。这种体系不仅具有液晶原来的特性，而且具有参入纳米磁性粒子引起的奇异磁性能。整个体系可以由磁场控制，实现磁写入，磁擦除的过程。因而这种新型材料有可能被应用于制作用磁场控制的液晶器件，从而大大地扩大了液晶的应用范围，同时更好的解决传统液晶显示材料的能耗问题。

关键词：Fe3O4磁性纳米粒子，手性酸表面修饰，胆甾相液晶，磁场控制

Answer 1

Magnetic nanoparticles through copolymerization surface and surface modification methods, with polymers or organic or inorganic materials combine to form the nuclear - the shell structure of magnetic microspheres. It has magnetic properties, but also has surface active groups, and to further cells, enzymes, proteins, antibodies and nucleic acids and other biological molecules coupling. The role of the external magnetic field, magnetic particles can be easily and at the end of liquid separation, separation is simple and efficient advantages.

In this paper, chemical precipitation prepared Fe3O4 magnetic nanoparticles through multiple different conditions of the comparative experiment, and X-ray diffraction (XRD), scanning electron microscopy (SEM) were characterized, prepared by a single particle size than the nanoparticles. As metal oxide nanoparticles on the surface there are a lot of - OH, with the band - COOH the hands of the acid reaction, the hand of this experiment varies acid Fe3O4 magnetic nanoparticles on a surface modified by XRD, SEM on the Modified After the Fe3O4 magnetic nanoparticles morphology characterization confirmed that this will enable Fe3O4 magnetic nanoparticles have in hand, and greatly enhance its dispersion.

As magnetic particles can be controlled by external magnetic field and therefore has a good targeting. To the surface of the hands of the acid-modified Fe3O4 magnetic nanoparticles evenly dispersed in cholesteric liquid crystal in the preparation of a Fe3O4 magnetic nanoparticles / LCD complex system, under certain conditions, a measure of stability. This system not only has the characteristics of the original LCD, but with the Senate to nano-magnetic particles from the singular magnetic properties. The entire system can be controlled by the magnetic field, and magnetic write, erase the magnetic process. Thus the new material could be used in the magnetic field produced by the LCD control device, thus greatly expand the application of the LCD, a better solution of the traditional liquid crystal display energy consumption issues.

Key words: Fe3O4 magnetic nanoparticles, chiral acid surface modification, cholesteric liquid crystal, magnetic control