Imbibition into Highly Porous Layers of Aggregated Particles
Imbibition into Highly Porous Layers of Aggregated Particles
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DOI：
10.1007/s11242-017-0876-2
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发表时间：
2017-06
影响因子：
2.7
通讯作者：
S. Schopf;A. Hartwig;U. Fritsching;L. Mädler
中科院分区：
文献类型：
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作者：
S. Schopf;A. Hartwig;U. Fritsching;L. Mädler
研究了高度多孔的纳米颗粒层的孔结构中的渗吸过程。这些层是用火焰喷雾热解工艺制造的，由聚集的纳米颗粒组成。孔结构的测量表明，这些层具有非常高的孔隙率和宽的孔径分布。渗吸实验表明渗吸过程偏离了经典的毛细上升理论（Bell，卡梅隆，Lucas和Washburn）。因此，开发了一种新的毛细管上升模型，该模型通过实施曲折度的分形维数来解释聚集颗粒层内的复杂孔隙结构。新模型和所进行的渗吸实验的比较，使渗吸过程的等效孔径的测定。所得的孔径与氮物理吸附测量的平均孔径一致。因此，新的模型能够预测的吸胀过程到高度多孔层的聚集颗粒。
The imbibition process into the pore structure of highly porous nanoparticle layers is investigated. The layers are fabricated with the Flame-Spray-Pyrolysis process and consist of aggregatednanoparticles. Measurements of the pore structure reveal that these layers have a very high porosity and a broad pore size distribution. Imbibition experiments show a deviation of the imbibition process from the classical capillary rising theory (Bell, Cameron, Lucas and Washburn). Therefore, a new capillary rising model is developed that accounts for the complex pore structure within layers of aggregated particles through the implementation of the fractal dimension of tortuosity. Comparison of the new model and the performed imbibition experiments enable the determination of the equivalent pore diameter for the imbibition process. The resulting pore diameter agrees well with the mean pore diameter of the nitrogen physisorption measurements. Hence, the new model enables the prediction of the imbibition process into highly porous layers of aggregated particles.