Suzuki Ryoko
Materials & Research Laboratory, Advanced Technology Research & Development Division, Nikon Corporation, 1-10-1 Asamizodai, Minami-ku, Sagamihara, Kanagawa 252-0328, Japan.
ACS Omega. 2024 Feb 21;9(9):10577-10582. doi: 10.1021/acsomega.3c08832. eCollection 2024 Mar 5.
The control of specific surface area and pore size of porous materials is essential for applications such as optics, medicine, and food technology. Here, the interspace between nanomaterials such as nanoparticles and nanosheets was studied. Nanoparticle-nanosheet interspaces were formed by incorporating bentonite nanosheets to the preparation of porous silica by the sol-gel method. The product had micropore and mesopores, which originated from internanoparticle space and nanoparticle-nanosheet spaces, respectively. These two types of pores had not only different sizes but also different aspect ratios. Time-domain nuclear magnetic resonance evaluation of the bentonite dispersion revealed that the dispersion state of bentonite in water prior to composite fabrication affected the formation of the pore structure. The pore size distribution could be easily changed by adding two-dimensional and flexible nanosheets owing to the change in the physical properties of the product. The silica-bentonite composite had a significantly larger specific surface area and pore volume than porous silica without bentonite. Water vapor adsorption measurements showed that the composite exhibited a larger maximum adsorption in comparison to porous silica. Therefore, a large improvement in the physical properties can be achieved by combining nanomaterials with different geometries.
控制多孔材料的比表面积和孔径对于光学、医学和食品技术等应用至关重要。在此，研究了纳米颗粒和纳米片等纳米材料之间的间隙。通过溶胶-凝胶法将膨润土纳米片掺入多孔二氧化硅的制备过程中，形成了纳米颗粒-纳米片间隙。产物具有微孔和介孔，分别源自纳米颗粒间空间和纳米颗粒-纳米片空间。这两种类型的孔不仅尺寸不同，而且纵横比也不同。对膨润土分散体的时域核磁共振评估表明，复合制备前膨润土在水中的分散状态影响孔结构的形成。由于产物物理性质的变化，通过添加二维柔性纳米片可以轻松改变孔径分布。与不含膨润土的多孔二氧化硅相比，二氧化硅-膨润土复合材料具有显著更大的比表面积和孔体积。水蒸气吸附测量表明，该复合材料与多孔二氧化硅相比表现出更大的最大吸附量。因此，通过将不同几何形状的纳米材料结合起来，可以实现物理性能的大幅改善。
