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Updated: Jul 9, 2026

Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces

Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces

Published on: September 26, 2014

A Micro Insight of Water Permeation in Polyurethane: Navigating for Water Transport.

Kai Chen¹, Zhenyuan Hang¹, Yongshen Wu²

¹College of Road and Bridge, Zhejiang Institute of Communications, Hanghzou 311112, China.

|January 25, 2025

Summary

Polyurethane (PU) grouting materials' effectiveness is limited by nanochannel formation. Molecular dynamics simulations reveal water permeation in PU nanochannels is pressure and width-dependent, with layered structures forming.

Keywords:

molecular dynamics nanochannels permeation polymer grouting material water

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Area of Science:

Materials Science
Geotechnical Engineering
Computational Chemistry

Background:

Polyurethane (PU) grouting materials are crucial for underground engineering, especially in deep-water environments.
Nanochannel formation within PU due to long-term exposure can compromise its reinforcement and waterproofing capabilities.
The microscopic mechanisms of water permeation in these nanochannels are not fully understood.

Purpose of the Study:

To investigate the permeation behavior of water molecules within polyurethane nanochannels.
To elucidate the microstructural changes induced by water permeation under varying conditions.
To understand the influence of water pressure and nanochannel width on water molecule dynamics.

Main Methods:

Construction of a computational model simulating PU nanochannels and water molecules.
Utilization of molecular dynamics simulations to analyze water-molecule interactions.
Systematic variation of water pressure and nanochannel width parameters.

Main Results:

A multi-stage, layered water permeation process was identified.
Significant permeation acceleration occurred above 3.08 MPa water pressure, with increased depth from 1.8 nm to 11.8 nm.
Increased channel width enhanced permeation depth (7.5 nm to 11.6 nm) and stratification, forming distinct hydrophobic and denser water layers.

Conclusions:

Water permeation in PU nanochannels is a complex process influenced by pressure and channel geometry.
Understanding these dynamics is key to improving the long-term performance of PU grouting materials in underground applications.
The formation of layered water structures and hydrophobic layers impacts material integrity and remediation effectiveness.