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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Related Experiment Video

Updated: Jun 16, 2026

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Ion Selectivity Inversion in Nanotube-Patterned Microchannels for Durable Osmotic Energy Harvesting.

Rong Tang1, Kaiqi Zhao1, Zhihao Li1

  • 1State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 7, 2025
PubMed
Summary

New titanium membranes with TiO2 nanotube arrays offer robust, selective anion transport in large microchannels, overcoming traditional limitations for durable osmotic energy conversion.

Keywords:
TiO2anodizationcharge separation mechanismsion selectivitymicrochannel membranesnanotubeosmotic energy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Traditional ion-selective membranes face a durability vs. selectivity trade-off, especially in large pores (>1 µm).
  • Organic membranes lack stability, while inorganic membranes suffer high resistance due to tortuous pathways.
  • Existing nanoscale designs fail in microchannels (up to 100 µm) where traditional mechanisms are ineffective.

Purpose of the Study:

  • To design robust porous titanium membranes with nanoscale precision for ion selectivity.
  • To overcome the limitations of traditional ion-selective membranes in microchannel systems.
  • To demonstrate a novel ion transport mechanism and energy conversion application.

Main Methods:

  • Fabrication of porous titanium membranes with TiO2 nanotube arrays via electrochemical anodization.
  • Characterization of nanotube structure and ion transport properties.
  • Testing of membranes for osmotic energy conversion and long-term durability.

Main Results:

  • Developed robust porous titanium membranes patterned with TiO2 nanotube arrays.
  • Achieved reversed ion selectivity (cation to anion transport) in microchannels up to 100 µm.
  • Demonstrated proof-of-concept osmotic energy conversion with 110 days of durability.

Conclusions:

  • TiO2 nanotube arrays enable selective anion transport in microchannels, bridging nanoscale control with macroscopic robustness.
  • The developed membranes offer a durable and effective solution for ion separation and energy conversion.
  • This work provides new insights into ion transport mechanisms in microchannels and redefines ion-selective membrane design.