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Related Experiment Video

Updated: May 1, 2026

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination

Published on: March 1, 2020

Two-dimensional water diffusion at a graphene-silica interface.

DaeEung Lee¹, Gwanghyun Ahn, Sunmin Ryu

¹Department of Applied Chemistry, Kyung Hee University , Yongin, Gyeonggi 446-701, Korea.

Journal of the American Chemical Society

|April 16, 2014

Summary

This summary is machine-generated.

Graphene creates a unique 2D space for studying molecular diffusion. Water intercalation under graphene is visualized in real-time, revealing substrate-dependent behavior and graphene

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Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy

Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy

Published on: September 21, 2020

Area of Science:

Materials Science
Surface Science
Physical Chemistry

Background:

Molecular behavior is significantly influenced by confinement effects due to surface dominance.
Understanding molecular diffusion in confined spaces is crucial for various physical, chemical, and biological systems.

Purpose of the Study:

To investigate two-dimensional molecular diffusion using graphene as a unique confining material.
To visualize and understand the real-time intercalation dynamics of water molecules beneath graphene.

Main Methods:

Utilized Raman spectroscopy to monitor water intercalation under graphene in real-time.
Employed Atomic Force Microscopy (AFM) to characterize the thickness of the interfacial water layer.
Investigated the role of substrate hydrophilicity in dictating water diffusion.

Main Results:

Graphene forms an atom-thick interstitial space suitable for 2D molecular diffusion studies.
Real-time Raman spectroscopy visualized water intercalation driven by substrate hydrophilicity.
AFM confirmed an interfacial water layer approximately 3.5 Å thick, akin to a water bilayer.
Graphene exhibited reversible deformation in response to intercalating water.
Identified oxygen species below graphene as the source of hole doping.

Conclusions:

Graphene acts as a transparent confining wall for studying interfacial phenomena.
Graphene and other 2D materials can serve as optical sensors for interfacial mass transport and charge transfer.
The study provides insights into molecular behavior in confined 2D environments.