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Related Experiment Video

Updated: Jun 18, 2025

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Published on: April 15, 2013

Water structures in tip-charged carbon nanotubes.

Yûi Ono¹, Eiji Yamamoto², Kenji Yasuoka¹

¹Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.

The Journal of Chemical Physics

|August 1, 2024

Summary

Water molecules in charged carbon nanotubes form complex structures influenced by electric fields. These findings are crucial for developing advanced separation membranes and nanofluidic devices.

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Carbon nanotubes (CNTs) are vital for separation membranes and nanofluidic devices.
Water behavior in CNTs is sensitive to surface functional groups and electric fields.
Existing research lacks a comprehensive understanding of combined functional group and electric field effects on confined water.

Purpose of the Study:

To investigate water molecule structures in tip-charged CNTs.
To understand the impact of electric fields generated by tip charges on water properties.
To explore water behavior in (8,8), (10,10), and (12,12) CNTs with varying charge distributions.

Main Methods:

Simulated water molecules within tip-charged CNTs of specific chiral vectors ((8,8), (10,10), (12,12)).
Modeled ionized functional groups as tip charges to simplify analysis.
Analyzed water structures under non-uniform electric fields generated by symmetrical tip charges.

Main Results:

Tip-charged CNTs exhibit complex, non-uniform electric fields.
Helical and square water structures with disturbances were observed in (8,8) and (10,10) CNTs.
Water properties varied significantly near positive and negative charges, and in the CNT center.
A local ring structure appeared near negative charges in (12,12) CNTs.

Conclusions:

Water structures in tip-charged CNTs differ from those in plain CNTs under uniform fields.
Tip charges create unique electric field distributions affecting water at the nanoscale.
Findings advance the understanding of water behavior in functionalized nanomaterials for separation applications.