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Related Experiment Video

Updated: Jul 13, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Non-Monotonic Interfacial Layering at Water/[C_nmim][TFSA] Interfaces Associated with Entropy-Enthalpy Compensation.

Takashi Iwahashi¹, Tatsuya Ishiyama², Akihiro Morita³

¹Department of Materials Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.

The Journal of Physical Chemistry. B

|July 11, 2026

Summary

Room-temperature ionic liquid (RTIL) interfaces with water show complex layering. Alkyl chain length influences this structure, peaking at a specific length due to entropy-enthalpy compensation, unlike air interfaces.

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Published on: September 9, 2022

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Last Updated: Jul 13, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Area of Science:

Physical Chemistry
Materials Science
Surface Science

Background:

Interfacial layering in room-temperature ionic liquids (RTILs) differs between air and water interfaces.
Air/RTIL interfaces show monotonic layering with alkyl chain length.
Water/RTIL interfaces exhibit a nonmonotonic trend in layering.

Purpose of the Study:

To elucidate the distinct interfacial structures at water/RTIL interfaces.
To investigate the role of alkyl chain length in RTIL interfacial organization.
To understand the factors driving nonmonotonic structural trends.

Main Methods:

Infrared-visible sum-frequency generation (IV-SFG) spectroscopy to probe interfacial molecular structure.
Molecular dynamics (MD) simulations to model interfacial behavior.
Interfacial tension measurements to quantify interface energetics.

Main Results:

Anion SO2 symmetric stretch intensity peaked at C12 chains, indicating maximum anion ordering.
Molecular dynamics revealed a tail-to-tail bilayer at C8, enhancing anion order but causing cation signal cancellation.
Interfacial tension peaked at C8, correlating with structural coherence and entropy-enthalpy compensation.

Conclusions:

The nonmonotonic structural evolution at water/RTIL interfaces is driven by entropy-enthalpy compensation and bulk-interface coupling.
Alkyl chain length critically dictates RTIL interfacial structure and properties.
Findings contrast with monotonic hydrophobic segregation at air/RTIL interfaces.