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Re-disperse of Aggregated Colloidal Quantum Dots

机译：重新分散聚集的胶体量子点

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摘要

Nanoparticles, whose size is 1-100 nm, easily aggregate as their size becomes smaller. Therefore, it is difficult to produce solution in which nanoparticles are dispersed. We have, as a way to disperse aggregated particles, for example, a media-typed disperse machine. During the procedures, however, we have to deal with some complicating operations; separation of the media from the solution, the defacement of the media into the solution, and so on. Furthermore, it is not an effective method for particles whose size is less than 50 nm. We tried to find an easier and more effective method for producing solution in which we re-disperse aggregated nanoparticles to still smaller particles. The aggregated particles were put into a machine with a pinhole small needle valve, and they were rc-dispcrsed by "sheering stress". The estimation of re-dispersion was carried out by the measurement of their size distribution and surface z-average. With the utility of the machine, the re-dispersions of aggregated particles were observed. Furthermore, the increase of the pressure and of the velocity of the flow caused the decrease of particle size, which makes the surface area larger and therefore the surface z-average larger. It become clear that it is possible to re-disperse aggregated nanoparticles by adding shearing stress. We can regulate shearing stress by controlling the pressure and flow, and therefore we can control the effectiveness and the yield.
机译：尺寸为1-100 nm的纳米颗粒随着其尺寸变小而容易聚集。因此，难以产生分散有纳米粒子的溶液。作为分散聚集颗粒的方法，我们有例如一种介质型分散机。但是，在程序执行过程中，我们必须处理一些复杂的操作。介质与溶液的分离，介质对溶液的破坏等。此外，对于尺寸小于50nm的颗粒，这不是有效的方法。我们试图找到一种更容易，更有效的生产溶液的方法，在该方法中，我们将聚集的纳米颗粒重新分散为更小的颗粒。将聚集的颗粒放入带有针孔小针阀的机器中，并通过“剪切应力”将其分散。通过测量它们的尺寸分布和表面z平均来进行再分散的估计。利用该机器，观察到聚集颗粒的重新分散。此外，压力和流动速度的增加导致粒径减小，这使得表面积更大并且因此表面z均值更大。显然，可以通过增加剪切应力来重新分散聚集的纳米颗粒。我们可以通过控制压力和流量来调节剪切应力，因此可以控制有效性和产量。

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  • 来源
  • 会议地点 San Francisco CA(US)
  • 作者

    Noriyoshi Manabe; Sanshiro Hanada; Yasuhiro Futamura; Akiyoshi Hoshino; Tadafumi Adschiri; Kenji Yamamoto;

  • 作者单位

    Intemational Clinical Research Center, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Shinjyuku-ku, Tokyo 162-8655, Japan Japan Association for the Advancement of Medical Equipment NKD Buil.6F, 3-42-6 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    Intemational Clinical Research Center, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Shinjyuku-ku, Tokyo 162-8655, Japan Japan Association for the Advancement of Medical Equipment NKD Buil.6F, 3-42-6 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    Intemational Clinical Research Center, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Shinjyuku-ku, Tokyo 162-8655, Japan;

    Intemational Clinical Research Center, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Sh;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 医用物理学;
  • 关键词

    sheering stress re-disperse nanoparticle;

    机译：剪切应力分散纳米颗粒;

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