研究目的
To discuss the application of atomic layer deposition (ALD) and related techniques in the design of novel membrane interfaces for enhancing performance and functionality.
研究成果
ALD enables precise and conformal modification of membrane interfaces, offering advantages such as substrate independence, tunable coating thickness, and the ability to introduce new functionalities. It holds promise for improving membrane performance in areas like water treatment, catalysis, and separation processes, but challenges remain in mechanical stability and process temperature compatibility.
研究不足
ALD may compromise the mechanical strength of polymer membranes due to the rigidity of inorganic coatings, and high-temperature ALD processes can exceed the melting points of some polymers. Research in this field is still in its infancy, with opportunities for low-temperature ALD and applications on hollow fiber membranes not fully explored.
This minireview summarizes existing literature and does not describe a specific experimental scheme. It reviews various studies where ALD is used for membrane modification, including surface hydrophilization, charge regulation, functionalization, pore size tuning, and fabrication of advanced membranes like Janus and isoporous membranes. The methods involve ALD processes with different precursors and conditions, applied to various membrane substrates such as PTFE, PP, PVDF, AAO, and others.
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Atomic Layer Deposition System
Used for depositing conformal coatings on membrane substrates to modify surface properties, pore sizes, and enable functionalization.
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Sequential Infiltration Synthesis System
A variant of ALD used for infiltrating precursors into polymer substrates to create hybrid materials with tailored properties.
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Molecular Layer Deposition System
Used for depositing organic or hybrid materials layer-by-layer, e.g., for polyimide coatings on membranes.
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Plasma Treatment System
Used for pre-treating membrane surfaces to activate them for better ALD nucleation, e.g., air plasma on PTFE membranes.
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Scanning Electron Microscope
Used for imaging membrane surfaces and structures to analyze coating uniformity and pore morphology.
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Anodic Aluminum Oxide Membrane
AAO
Used as a substrate for ALD modifications to study pore size tuning, surface charge regulation, and fabrication of thin film composite membranes.
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Polyterafluoroethylene Membrane
PTFE
A common hydrophobic membrane substrate modified by ALD for hydrophilization and other functionalizations.
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Polypropylene Membrane
PP
Another hydrophobic membrane substrate used in ALD studies for surface modification and Janus membrane fabrication.
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Polyvinylidene Fluoride Membrane
PVDF
Membrane substrate modified with ALD for improved anti-fouling and catalytic properties.
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Block Copolymer
PS-b-PMMA
Used as a template for SIS to fabricate isoporous membranes with precise pore structures.
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