A hierarchical view on material formation during pulsed-laser synthesis of nanoparticles in liquid.
A hierarchical view on material formation during pulsed-laser synthesis of nanoparticles in liquid.
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DOI：
10.1038/srep16313
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发表时间：
2015-11-09
影响因子：
4.6
通讯作者：
Plech A
中科院分区：
文献类型：
--
作者：
Ibrahimkutty S;Wagener P;dos Santos Rolo T;Karpov D;Menzel A;Baumbach T;Barcikowski S;Plech A
脉冲激光辅助纳米粒子液相合成（PLAL）是一种多功能的纳米粒子合成工具。然而，在PLAL过程中的结构形成的基本方面目前知之甚少。我们通过快速X射线照相术（XR）和扫描小角X射线散射（SAXS），这使我们能够探测从纳米到毫米的长度尺度上的微秒时间分辨率的过程中的时空动力学分析在PLAL。我们发现，全球结构的演变，如汽泡的动力学可以与银纳米粒子的轨迹和演变。气泡在颗粒形成中起着重要作用，因为它限制了初级颗粒并将它们重新沉积到基底上。第二气泡中的受限颗粒发生团聚。另外，在第二气泡破裂时，垂直于表面喷射受限材料的射流。我们假设这些动力学影响最终的粒度分布，并确定所得胶体的质量，例如通过颗粒云压缩和颗粒释放到液体中之间的相互作用的多分散性和模态。
Pulsed-laser assisted nanoparticle synthesis in liquids (PLAL) is a versatile tool for nanoparticle synthesis. However, fundamental aspects of structure formation during PLAL are presently poorly understood. We analyse the spatio-temporal kinetics during PLAL by means of fast X-ray radiography (XR) and scanning small-angle X-ray scattering (SAXS), which permits us to probe the process on length scales from nanometers to millimeters with microsecond temporal resolution. We find that the global structural evolution, such as the dynamics of the vapor bubble can be correlated to the locus and evolution of silver nanoparticles. The bubble plays an important role in particle formation, as it confines the primary particles and redeposits them to the substrate. Agglomeration takes place for the confined particles in the second bubble. Additionally, upon the collapse of the second bubble a jet of confined material is ejected perpendicularly to the surface. We hypothesize that these kinetics influence the final particle size distribution and determine the quality of the resulting colloids, such as polydispersity and modality through the interplay between particle cloud compression and particle release into the liquid.