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首页> 外文会议>SPIE Conference on Colloidal Quantum Dots for Biomedical Applications >Re-disperse of Aggregated Colloidal Quantum Dots
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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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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 re-dispersed 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：纳米颗粒，其尺寸为1-100nm，易于聚集，因为它们的尺寸变小。因此，难以制备分散纳米颗粒的溶液。我们具有分散聚集颗粒的一种方式，例如，介质类型的分散机。但是，在程序期间，我们必须处理一些复杂的操作;从溶液中分离介质，将介质的污垢进入溶液，等等。此外，它不是粒子的尺寸小于50nm的有效方法。我们试图找到一种更容易和更有效的方法，用于制备我们将聚集的纳米颗粒重新分散到仍然较小的颗粒中的溶液。将聚集的颗粒用针孔小针阀置于机器中，通过“缩减胁迫”重新分散。通过测量其尺寸分布和表面Z平均水平进行再分散估计。利用机器的效用，观察到聚集颗粒的重新分散。此外，压力的增加和流速的速度导致粒度的降低，这使得表面积更大，因此表面Z平均较大。显然，可以通过添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，因此我们可以控制效果和产量。

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