Formation of porous silica nanoparticles at higher reaction kinetics
Formation of porous silica nanoparticles at higher reaction kinetics
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DOI：
10.1016/j.powtec.2018.08.069
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发表时间：
2018-11
影响因子：
5.2
通讯作者：
M. Meier;Julian Ungerer;M. Klinge;H. Nirschl
中科院分区：
文献类型：
--
作者：
M. Meier;Julian Ungerer;M. Klinge;H. Nirschl
这项工作涉及分析在不添加任何表面活性剂的情况下形成多孔球形二氧化硅颗粒的过程。广泛测量技术的使用使得可以跟踪关于颗粒大小、结构和密度的颗粒形成过程。基于开尔文效应的孔入口直径分布分析表明，在较高的反应温度下，颗粒结构发生了变化。UV-Vis光谱和透射电子显微镜的测量显示，在反应的第一分钟内，颗粒向较小的尺寸崩塌。合成温度越高，崩塌越明显，崩塌发生得越早。时间分辨的SAXS数据将散射强度的急剧增加与由于颗粒尺寸崩塌而导致的颗粒密度的增加相关联。
This work deals with the analysis of the formation of porous spherical silica particles without adding any surfactants. The use of a wide range of measurement techniques allows the particle formation process to be tracked with regard to the particle size, structure and density. The analysis of the pore inlet diameter distribution based on theKelvin effectindicates a change in the particle structure at higher reaction temperatures. Measurements with UV–Vis spectroscopy and TEM showed a collapse toward smaller particle sizes within the first minutes of the reaction. The higher the synthesis temperature, the more pronounced the collapse is and the sooner it takes place. Time-resolved SAXS data correlate a drastic increase in scattering intensity with an increase in particle density due to a collapse in particle size.