Department of Micro- and Nanoelectronics, Faculty of Electronics, Saint-Petersburg Electrotechnical University "LETI", 5, pr. Popova, 197376 Saint-Petersburg, Russia.
Department of Descriptive Geometry and Graphics, Faculty of Basic and Human Sciences, Saint-Petersburg Mining University, 2, 21st Line, 199106 Saint-Petersburg, Russia.
Int J Mol Sci. 2021 Sep 29;22(19):10521. doi: 10.3390/ijms221910521.
It was developed a new technique to assess micro- and mesopores with sizes below a few nanometers. The porous materials with hierarchical fractal-percolation structure were obtained with the sol-gel method. The tetraethoxysilane hydrolysis and polycondensation reactions were performed in the presence of salts as the sources of metal oxides. The porous materials were obtained under spinodal decomposition conditions during application of the polymer sol to the substrate surface and thermal treatment of the structures. The model is based on an enhanced Kepler net of the 4612 type with hexagonal cells filled with a quasi-two-dimensional projection of the Jullien fractal after the 2nd iteration. The materials obtained with the sol-gel method were studied using the atomic force microscopy, electron microscopy, thermal desorption, as well as an AutoCAD 2022 computer simulation of the percolation transition in a two-component system using the proposed multimodal model. Based on the results obtained, a new method was suggested to assess micro- and mesopores with sizes below a few nanometrs, which cannot be analyzed using the atomic force microscopy and electron microscopy.
开发了一种新的技术来评估尺寸小于几纳米的微孔和介孔。采用溶胶-凝胶法获得具有分级分形渗透结构的多孔材料。在盐作为金属氧化物来源的存在下，进行四乙氧基硅烷水解和缩聚反应。在将聚合物溶胶施加到基底表面和结构的热处理期间，在旋节分解条件下获得多孔材料。该模型基于增强型 Kepler 网络，其中 4612 型的六方单元填充了经过第二次迭代后的 Jullien 分形的准二维投影。使用原子力显微镜、电子显微镜、热解吸以及使用所提出的多峰模型对两相体系中渗透转变的 AutoCAD 2022 计算机模拟，对溶胶-凝胶法获得的材料进行了研究。基于所获得的结果，提出了一种新的方法来评估尺寸小于几纳米的微孔和介孔，这些孔无法使用原子力显微镜和电子显微镜进行分析。
