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Sequential Interpenetrating Polymer Network Confines Shear-Aligned Graphene Oxide Liquid Crystals Enabling Precise
Ria Sen Gupta1, Sk Safikul Islam1,2, Dhondi Pradeep3
1Department of Materials Engineering, Indian Institute of Science, Bengaluru, Karnataka, 560012, India.
Small (Weinheim an Der Bergstrasse, Germany)
|May 16, 2025
Summary
This study developed stable, ordered graphene oxide membranes for water treatment. These membranes offer high water flux and excellent separation efficiency for various contaminants without swelling.
Area of Science:
- Materials Science
- Nanotechnology
- Water Treatment
Background:
- Graphene oxide (GO) membranes show potential for nanofiltration but suffer from instability and swelling.
- Practical applications are hindered by structural degradation under pressure and water intercalation.
Purpose of the Study:
- To overcome the limitations of GO membranes by developing structurally stable and ordered membranes.
- To enhance water transport and sieving capabilities for efficient water purification.
Main Methods:
- Aligning GO-based liquid crystals using shear forces.
- Stabilizing membranes with a sequential interpenetrating polymeric network (IPN) via electrostatic anchoring.
- Utilizing nanoconfinement to preserve long-range order.
Main Results:
- Achieved a nematic phase at low concentrations using dopamine and GO liquid crystals.
- Confirmed pore sizes of ~7 nm with nanomaterial inclusion.
- Demonstrated exceptional water flux (145 LMH) and >97% separation efficiency for salts, dyes, and antibiotics.
- MD simulations supported experimental findings on reduced water flux and ion retention.
Conclusions:
- The developed membranes are highly ordered, structurally stable, and exhibit excellent performance in water treatment.
- These membranes show antifouling, chlorine resistance, antibacterial activity, and cytocompatibility.
- The findings indicate strong potential for large-scale, sustainable water purification applications.
