Polyelectrolyte multilayers: preparation and applications

Izumrudov, Vladimir A.; Мussabayeva, B.Kh.; Мурзагулова, К. Б.

doi:10.1070/rcr4767

Cited by 27 publications

(25 citation statements)

References 55 publications

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“…Polyanions comprising sulphonate and sulphate anionic moieties (i.e., PSS, heparin, poly(vinyl sulphonate) salts) yield highly stable PE films through the formation of strong and irreversibly ionically cross-linked pairs [80]. While this makes them the go-to solution for PE membrane synthesis, expansion of polyanion pool enables broader choice for task specific PE implemented in CO 2 capture [71].…”

Section: Anion-functionalised Polyelectrolytesmentioning

confidence: 99%

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: Anion-functionalised Polyelectrolytesmentioning

confidence: 99%

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

Nikolaeva

Luis

2020

Molecules

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“…Several reports on strong PE capsules to date show their wide use in many practical applications ranging from the loading and controlled release of therapeutic agents upon minor variations in the environmental characteristics, surface modification and suppression of inter-chain interaction to the degradation/rearrangement of LbL films under the action of physical factors [19,20]. In spite of the fact that weak PE systems can also offer many such advantages, only a few works have been reported.…”

Section: Review Introductionmentioning

confidence: 99%

Multilayer capsules made of weak polyelectrolytes: a review on the preparation, functionalization and applications in drug delivery

Sharma¹,

Sundaramurthy²

2020

Beilstein J. Nanotechnol.

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Multilayer capsules have been of great interest for scientists and medical communities in multidisciplinary fields of research, such as drug delivery, sensing, biomedicine, theranostics and gene therapy. The most essential attributes of a drug delivery system are considered to be multi-functionality and stimuli responsiveness against a range of external and internal stimuli. Apart from the highly explored strong polyelectrolytes, weak polyelectrolytes offer great versatility with a highly controllable architecture, unique stimuli responsiveness and easy tuning of the properties for intracellular delivery of cargo. This review describes the progress in the preparation, functionalization and applications of capsules made of weak polyelectrolytes or their combination with biopolymers. The selection of a sacrificial template for capsule formation, the driving forces involved, the encapsulation of a variety of cargo and release based on different internal and external stimuli have also been addressed. We describe recent perspectives and obstacles of weak polyelectrolyte/biopolymer systems in applications such as therapeutics, biosensing, bioimaging, bioreactors, vaccination, tissue engineering and gene delivery. This review gives an emerging outlook on the advantages and unique responsiveness of weak polyelectrolyte based systems that can enable their widespread use in potential applications.

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“…Polyelectrolyte (PEL) multilayers (PEMs) were introduced by Decher [1] in the early 1990s and can be used as a simple surface modification technique for planar, curved and even porous substrates based on aqueous systems. Moreover, PEMs have become an interesting topic in colloid and surface science, as comprehensively reviewed both earlier [2,3,4] and more recently [5,6,7,8,9]. PEMs have wide application in biomedicine [10,11,12,13], diagnostics and sensorics [14,15,16], and separation technology [17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

The Anomalous Influence of Polyelectrolyte Concentration on the Deposition and Nanostructure of Poly(ethyleneimine)/Poly(acrylic acid) Multilayers

Müller

2019

Molecules

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The deposition and nanostructure of polyelectrolyte (PEL) multilayers (PEMs) of branched poly(ethyleneimine)/poly(acrylic acid) (PEI/PAA) onto silicon substrates was studied in terms of the dependence of pH and the PEL concentration (cPEL) in the individual adsorption steps z. Both a commercial automatic dipping device and a homebuilt automatic stream coating device (flow cell) were used. Gravimetry, SFM, transmission (TRANS) and in situ attenuated total reflection (ATR) FTIR spectroscopy were used for the quantitative determination of the adsorbed amount, thickness, chemical composition and morphology of deposited PEMs, respectively. Firstly, the combination of pH = 10 for PEI and pH = 4 for PAA, where both PEL were predominantly in the neutral state, resulted in an extraordinarily high PEM deposition, while pH combinations, where one PEL component was charged, resulted in a significantly lower PEM deposition. This was attributed to both PEL conformation effects and acid/base interactions between basic PEI and acidic PAA. Secondly, for that pH combination an exponential relationship between PEM thickness and adsorption step z was found. Thirdly, based on the results of three independent methods, the course of the deposited amount of a PEM-10 (z = 10) versus cPEL in the range 0.001 to 0.015 M at pH = 10/4 was non-monotonous showing a pronounced maximum at cPEL = 0.005 M. Analogously, for cPEL = 0.005 M a maximum of roughness and structure size was found. Fourthly, related to that finding, in situ ATR-FTIR measurements gave evidence for the release of outermost located PEI upon PAA immersion (even step) and of outermost PAA upon PEI immersion (odd step) under formation of PEL complexes in solution. These studies help us to prepare PEL-based films with a defined thickness and morphology for interaction with biofluids in the biomedical and food fields.

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Polyelectrolyte multilayers: preparation and applications

Cited by 27 publications

References 55 publications

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

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

Multilayer capsules made of weak polyelectrolytes: a review on the preparation, functionalization and applications in drug delivery

The Anomalous Influence of Polyelectrolyte Concentration on the Deposition and Nanostructure of Poly(ethyleneimine)/Poly(acrylic acid) Multilayers

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