Preparation of water-dispersible Janus nanosheets from K4Nb6O17·3H2O and their behaviour as a two-dimensional surfactant on air-water and water-toluene interfaces

Ryoko Suzuki, Tomoki Nagai, Emika Onitsuka, Naokazu Idota, Masashi Kunitake, Taisei Nishimi, Yoshiyuki Sugahara*

*この研究の対応する著者

研究成果: Article査読

抄録

K4Nb6O17·3H2O-based Janus nanosheets with water dispersibility and surface activity were prepared via sequential regioselective surface modification. To provide individual Janus nanosheets with these two properties, phenylphosphonic acid and phosphoric acid were utilized for surface modification at interlayers I and II of K4Nb6O17·3H2O, respectively, and the resulting product was exfoliated into single-layered nanosheets by ultrasonication in water. The resulting aqueous dispersion of the Janus nanosheets showed lower surface tension than pure water, confirming that the Janus nanosheets had surface activity. An o/w emulsion was formed using the Janus nanosheet aqueous dispersion and toluene. In this emulsion, characteristic phenomena, coalescence and Ostwald ripening behaviour of toluene droplets were observed; the appearance of ellipsoidal droplets during coalescence and a rapid Ostwald ripening which differ from those observed for systems using conventional surfactants, were observed. These phenomena likely originated from the unique anisotropic structures of Janus nanosheets with their nm-scale thickness and μm-range lateral size.

本文言語English
ページ(範囲)3625-3635
ページ数11
ジャーナルDalton Transactions
51
9
DOI
出版ステータスPublished - 2022 3月 7

ASJC Scopus subject areas

  • 無機化学

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