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Evaluation of solvent property of air–water interface based on the fluorescence spectra of 1,2′-dinaphthylamine in the aqueous solution of ultrafine bubbles

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Abstract

Solvent property of air–water interface was evaluated based on the fluorescence spectra of 1,2′-dinaphthylamine in water containing ultrafine bubbles (average diameter: 103 nm, standard deviation: 38 nm). Among naphthylamine derivatives whose fluorescence spectra were responsive to microscopic hydrophobicity, 1,2′-dinaphthylamine (DN) was selected because its wavelength of the maximum emission (λmax) was significantly dependent on the concentration and microenvironment of the ultrafine bubble. The λmax value of DN in water was 486 nm, while it shifted to shorter wavelength (408 nm) in the presence of 1.09 × 109 mL−1 of ultrafine bubbles. The shift of λmax value indicates that DN adsorbs on the surfaces of ultrafine bubbles and exists in hydrophobic region rather than in bulk water. By comparing with the λmax values in different solvents, the surface of ultrafine bubble was found to have similar solvent property to ethyl ether or ethyl acetate that are widely used as extracting solvents for hydrophobic organic compounds.

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The results of this study may provide quantitative information on the area of the air-water interface or the volume of the interfacial region, which is useful for the use of ultrafine bubbles as a reaction medium.

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Acknowledgements

This study was supported by a Grant-in-Aid for Scientific Research (B) (22H02115). The authors are very grateful to Mr. Takuya Iwata (Nagoya University) for his kind support for the measurements of UFB.

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Authors and Affiliations

  1. Graduate School of Engineering, Kitami Institute of Technology, 165 Koen-Cho, Kitami, Hokkaido, 090-8507, Japan

    Koki Kodama, Shogo Hattori & Tohru Saitoh

  2. Graduate School of Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya, Aichi, 464-8603, Japan

    Keiji Yasuda

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  1. Koki Kodama
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  4. Tohru Saitoh
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Correspondence to Tohru Saitoh.

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Kodama, K., Hattori, S., Yasuda, K. et al. Evaluation of solvent property of air–water interface based on the fluorescence spectra of 1,2′-dinaphthylamine in the aqueous solution of ultrafine bubbles. ANAL. SCI. 40, 341–345 (2024). https://doi.org/10.1007/s44211-023-00454-x

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