Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

Pramanik, Nabendu B.; Regen, Steven L.

doi:10.1002/tcr.201900026

Cited by 8 publications

(7 citation statements)

References 53 publications

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“…The ability of quaternary ammonium groups to engage in electrostatic and hydrophobic interactions, as well as hydrogen-bonding expands their possibilities to form tighter PEs films [75]. This properties may be enhanced through ionic cross-linking, often referred to as 'glueing together' [76]. Ionic cross-linking promotes the stiffness of the PEs matrix through incorporation of several quaternary ammonium groups per PEs monomer and leads to increased CO 2 selectivity [77].…”

Section: Cation-functionalised Polyelectrolytesmentioning

confidence: 99%

“…Post-synthetic functionalisation to attain tailor-made PEs with cationic pendants prevails in the field of polyelectrolyte development for membrane-based for CO 2 capture. However, less prominent anion-functionalised PEs play a vital role in the membrane preparation and are generally derived by sulphonation [73,76]. This method requires initial incorporation of aminealcohol molecules in the polymer chain via covalent coupling.…”

Section: Anion-functionalised Polyelectrolytesmentioning

confidence: 99%

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Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture

Nikolaeva

Luis

2020

Molecules

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Polymer-based CO2 selective membranes offer an energy efficient method to separate CO2 from flue gas. ‘Top-down’ polyelectrolytes represent a particularly interesting class of polymer materials based on their vast synthetic flexibility, tuneable interaction with gas molecules, ease of processability into thin films, and commercial availability of precursors. Recent developments in their synthesis and processing are reviewed herein. The four main groups of post-synthetically modified polyelectrolytes discern ionised neutral polymers, cation and anion functionalised polymers, and methacrylate-derived polyelectrolytes. These polyelectrolytes differentiate according to the origin and chemical structure of the precursor polymer. Polyelectrolytes are mostly processed into thin-film composite (TFC) membranes using physical and chemical layer deposition techniques such as solvent-casting, Langmuir-Blodgett, Layer-by-Layer, and chemical grafting. While solvent-casting allows manufacturing commercially competitive TFC membranes, other methods should still mature to become cost-efficient for large-scale application. Many post-synthetically modified polyelectrolytes exhibit outstanding selectivity for CO2 and some overcome the Robeson plot for CO2/N2 separation. However, their CO2 permeance remain low with only grafted and solvent-casted films being able to approach the industrially relevant performance parameters. The development of polyelectrolyte-based membranes for CO2 separation should direct further efforts at promoting the CO2 transport rates while maintaining high selectivities with additional emphasis on environmentally sourced precursor polymers.

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Section: Cation-functionalised Polyelectrolytesmentioning

confidence: 99%

Section: Anion-functionalised Polyelectrolytesmentioning

confidence: 99%

Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture

Nikolaeva

Luis

2020

Molecules

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“…Because our most important findings have recently been reviewed, they will not be discussed in this Perspective. 14 …”

Section: From Perforated Monolayers To Layer-by-layer Thin Filmsmentioning

confidence: 99%

Creating Hyperthin Membranes for Gas Separations

Regen

2022

Langmuir

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Interest in creating membranes that can separate gases has intensified in recent years owing, in large part, to climate change. Specifically, the need for separating CO 2 and N 2 from flue gas in an economically viable fashion is now considered urgent. This Perspective highlights two recent developments from my laboratory—defect repair of polyelectrolyte multilayers (PEMs) using micellar solutions of sodium dodecyl sulfate (SDS) and the surface modification of a highly permeable polymer, poly[1-(trimethylsilyl) propyne] (PTMSP)—which I believe have significant implications not only for this CO 2 /N 2 problem but also for the ever-growing area of layer-by-layer (LbL) thin films. A brief mention is also made of past efforts that have been aimed at creating hyperthin membranes from porous surfactants and from PEMs with a view toward gas separations.

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“…Sulphation affords the incorporation of anionic moieties into the neutral polymer precursor for the post-functionalization of PILs [206,208]. Alternatively, a similar method where the initial presence of amino alcohol groups in the polymer chain enables the reaction between the hydroxyl and sulphur trioxide, is referred to as sulphamation [209,210].…”

Section: Post-functionalization Of Existing Polymersmentioning

confidence: 99%

“…To increase the chain packing density, PILs often incorporate aromatic groups with substituents that promote hydrophobic interactions and enable π-stacking [202]. Overall the quaternary ammonium groups yield tighter PILs films through an interplay between electrostatic, hydrophobic, and hydrogen-bonding interactions, which can be further enhanced through ionic cross-linking [205,206]. This so-called "ionic gluing" renders them highly selective towards CO 2 [150,207].…”

Section: Post-functionalization Of Existing Polymersmentioning

confidence: 99%

A Review on Ionic Liquid Gas Separation Membranes

et al. 2021

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Ionic liquids have attracted the attention of the industry and research community as versatile solvents with unique properties, such as ionic conductivity, low volatility, high solubility of gases and vapors, thermal stability, and the possibility to combine anions and cations to yield an almost endless list of different structures. These features open perspectives for numerous applications, such as the reaction medium for chemical synthesis, electrolytes for batteries, solvent for gas sorption processes, and also membranes for gas separation. In the search for better-performing membrane materials and membranes for gas and vapor separation, ionic liquids have been investigated extensively in the last decade and a half. This review gives a complete overview of the main developments in the field of ionic liquid membranes since their first introduction. It covers all different materials, membrane types, their preparation, pure and mixed gas transport properties, and examples of potential gas separation applications. Special systems will also be discussed, including facilitated transport membranes and mixed matrix membranes. The main strengths and weaknesses of the different membrane types will be discussed, subdividing them into supported ionic liquid membranes (SILMs), poly(ionic liquids) or polymerized ionic liquids (PILs), polymer/ionic liquid blends (physically or chemically cross-linked ‘ion-gels’), and PIL/IL blends. Since membrane processes are advancing as an energy-efficient alternative to traditional separation processes, having shown promising results for complex new separation challenges like carbon capture as well, they may be the key to developing a more sustainable future society. In this light, this review presents the state-of-the-art of ionic liquid membranes, to analyze their potential in the gas separation processes of the future.

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Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

Cited by 8 publications

References 53 publications

Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture

Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture

Creating Hyperthin Membranes for Gas Separations

A Review on Ionic Liquid Gas Separation Membranes

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