Shyjumon I, Rappolt M, Sartori B, Amenitsch H, Laggner P
Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz A-8042, Austria.
Rev Sci Instrum. 2008 Apr;79(4):043905. doi: 10.1063/1.2908436.
An in-house built aerosol generator setup for in situ gas phase studies of aerosol and nanoparticles is described. The aerosol generator with an ultrasonic ceramic disk mist maker provides high enough particle concentrations for structural gas phase analysis by synchrotron small angle x-ray scattering (for water approximately 4 x 10(8) droplets/s with a droplet size of approximately 2.5 microm). The working principle was proved by scattering of gold nanoparticles. For evaporation induced self-assembly studies of nanostructured particles, an additional thermal treatment chamber was included in the setup. The first on-line gas phase data with our setup for mesostructured silica particles are presented for different thermal treatments. Scanning electron microscope imaging revealed the average particle size to be approximately 1 microm. Furthermore, to quantify their internal nanostructure, diffraction experiments of deposited silica aerosols were carried out and the corresponding electron density map indicates a silica wall thickness of about 1 nm.
本文描述了一种用于气溶胶和纳米颗粒原位气相研究的内部构建的气溶胶发生器装置。带有超声陶瓷盘雾化器的气溶胶发生器可提供足够高的颗粒浓度，用于通过同步加速器小角X射线散射进行结构气相分析（对于水，约为4×10⁸个液滴/秒，液滴尺寸约为2.5微米）。通过金纳米颗粒的散射证明了其工作原理。对于纳米结构颗粒的蒸发诱导自组装研究，该装置中还包括一个额外的热处理室。展示了使用我们的装置对介孔结构二氧化硅颗粒进行不同热处理时的首批在线气相数据。扫描电子显微镜成像显示平均粒径约为1微米。此外，为了量化其内部纳米结构，对沉积的二氧化硅气溶胶进行了衍射实验，相应的电子密度图表明二氧化硅壁厚约为1纳米。
