From Atomic Channels to Deployable Membranes: A Design-Oriented Framework for Graphene Oxide Transport,...

Area of Science:

• Materials Science and Engineering
• Chemical Engineering
• Computational Materials Science

Background:

• Graphene oxide (GO) membranes show promise for overcoming the permeability-selectivity limitations of conventional polymer membranes.
• Current challenges include incomplete mechanistic understanding and a lack of scalable, defect-controlled fabrication processes, hindering practical application.
• A comprehensive design framework is needed to integrate transport mechanisms, computational modeling, fabrication, and translational constraints.

Purpose of the Study:

• To synthesize and integrate transport mechanisms, computational modeling, fabrication, and translational constraints for graphene-based membrane architectures.
• To establish a comprehensive, design-oriented framework for advancing GO membrane technology.
• To address key challenges hindering the practical deployment of GO membranes.

Main Methods:

• Review and synthesis of existing literature on GO membrane transport mechanisms and fabrication.
• Quantitative parity analysis of molecular dynamics simulations against experimental data.
• Benchmarking of GO membrane performance across various applications against commercial standards.
• Proposal of a standardized hydraulic stability protocol.

Main Results:

• Evidence supports a three-regime transport model (viscous flow, hopping, solution-diffusion), with selectivity tunable via C/O ratio and interlayer chemistry.
• Classical molecular dynamics overestimates GO water permeance by 3-8x; machine learning force fields reduce this to 1.5-2x.
• Nuclear quantum effects are critical for proton transport but unresolved for water permeance in GO laminates.
• Performance benchmarking reveals heterogeneity in testing conditions; a 500-h hydraulic stability protocol is proposed.

Conclusions:

• A unified framework for GO membrane design is presented, integrating transport phenomena, computational insights, and fabrication considerations.
• The review provides a structured basis for developing next-generation GO membranes by addressing key mechanistic and computational discrepancies.
• Standardized testing protocols are crucial for reliable cross-laboratory comparisons and technology advancement.