Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 50018-Zaragoza, Spain.
Nanotechnology. 2012 Oct 26;23(42):425605. doi: 10.1088/0957-4484/23/42/425605. Epub 2012 Oct 4.
The present work addresses the main bottleneck in the synthesis of magnetic nanoparticles by laser pyrolysis. Since the introduction of laser pyrolysis for the production of nanoparticles nearly three decades ago, this method has been repeatedly presented as a highly promising alternative, on account of two main characteristics: (i) its flexibility, since nanoparticles can be formed from a wide variety of precursors in both gas and liquid phase, and (ii) its continuous nature, avoiding the intrinsic variability of batch processing. However, the results reported to date invariably show considerable aggregation of the obtained nanoparticles, which strongly limits their application in most fields. In this work, we have been able to circumvent this problem by collecting the particles in a polyol liquid medium. This method prevents the formation of aggregates and renders a uniform distribution of well dispersed ultrasmall nanoparticles (<4 nm) in a water-compatible solvent. We consider that the effectiveness of this novel collection method for the production of well-dispersed magnetic nanoparticles will be of high interest to a wide range of scientists working in the nanoparticle synthesis field and may enable new applications wherever there is a strict requirement for non-agglomerated nanoparticles.
目前的工作主要解决了激光热解合成磁性纳米粒子的主要瓶颈问题。自近三十年前激光热解被引入用于生产纳米粒子以来，由于其两个主要特点，该方法已被反复提出作为一种极具前景的替代方法：(i) 其灵活性，因为可以从气相和液相中的各种前体制备纳米粒子；(ii) 其连续性质，避免了批处理固有可变性。然而，迄今为止报道的结果无一例外地显示出所获得的纳米粒子的明显聚集，这强烈限制了它们在大多数领域中的应用。在这项工作中，我们通过在多元醇液体介质中收集颗粒来解决这个问题。这种方法防止了团聚体的形成，并在水相容溶剂中呈现出均匀分布的超小纳米颗粒(<4nm)。我们认为，这种新颖的收集方法对于生产分散良好的磁性纳米粒子的有效性将引起从事纳米粒子合成领域的广泛科学家的极大兴趣，并可能在任何对非团聚纳米粒子有严格要求的地方开辟新的应用。
