Nishida Nanako, Arakawa Kyosuke, Shimada Tetsuya, Takagi Shinsuke
Department of Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-ohsawa 1-1, Hachiohji, Tokyo 192-0397, Japan.
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda-shi, Yamazaki 278-8510, Japan.
Langmuir. 2024 Mar 26;40(12):6595-6600. doi: 10.1021/acs.langmuir.3c03494. Epub 2024 Feb 19.
Clay-silica nanocomposite materials (CSiN) were prepared by an electrostatic interaction between negatively charged clay nanosheets and positively charged spherical silica, which was modified with an alkyl ammonium group by silane coupling. By optimization of the preparation conditions, 84% coverage of the silica surface by the clay nanosheets was achieved. Adsorption experiments using cationic porphyrin dyes on the CSiN revealed that the clay nanosheet covers the spherical silica as a single layer and does not detach from the silica surface under aqueous conditions. In addition, it turned out that the cationic porphyrin dye did not penetrate the space between the silica surface and the clay nanosheet. Porphyrin molecules were adsorbed only at the outer surface of the clay nanosheet without molecular aggregation even under the high-density adsorption conditions. By combining spherical silica and clay nanosheets, it is possible to prepare novel hybrid materials where the surface can act as a unique adsorption field for dyes.
通过带负电荷的粘土纳米片与带正电荷的球形二氧化硅之间的静电相互作用制备了粘土-二氧化硅纳米复合材料（CSiN），其中球形二氧化硅通过硅烷偶联用烷基铵基团进行了改性。通过优化制备条件，实现了粘土纳米片对二氧化硅表面84%的覆盖。在CSiN上使用阳离子卟啉染料进行的吸附实验表明，粘土纳米片以单层形式覆盖球形二氧化硅，并且在水性条件下不会从二氧化硅表面脱落。此外，结果表明阳离子卟啉染料不会渗透到二氧化硅表面与粘土纳米片之间的空间。即使在高密度吸附条件下，卟啉分子也仅吸附在粘土纳米片的外表面，且没有分子聚集。通过将球形二氧化硅和粘土纳米片结合，可以制备出表面可作为染料独特吸附场的新型杂化材料。
