Nonlinear growth of multilayer films formed from weak polyelectrolytes

Elżbieciak, Magdalena; Kolasińska, Marta; Zapotoczny, Szczepan; Krastev, Rumen; Nowakowska, Maria; Warszyński, Piotr

doi:10.1016/j.colsurfa.2009.01.034

Cited by 46 publications

(42 citation statements)

References 31 publications

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“…The charge density of weak PEs can directly be tuned by varying the pH of the solution and the structure of multilayers can be changed either by varying the PE solution pH or the environmental pH after build-up ( Figure 4). [26,62,63,64] Although relatively little work has been done in this area, it has been reported that addition of an organic solvent to the PE solutions also influences the PEM growth. Increasing alcohol content in aqueous adsorption solutions increases the strength of the electrostatic interactions between PE chains, [73] due to the decreased dielectric constant of the solvent mixture.…”

Section: Parameters That Influence the Lbl Assembly Of Pemsmentioning

confidence: 99%

Layer-by-layer preparation of polyelectrolyte multilayer membranes for separation

et al. 2014

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Polymer membranes provide a highly promising platform for the development of an efficient and sustainable technique for separation. Ideally such membranes combine a high flux with a high selectivity requiring thin defect-free membranes. The layer by layer (LBL) assembly technique has proven to be a versatile and simple method for the fabrication of very thin polyelectrolyte multilayers making it highly suitable for the preparation of separation membranes. Recent developments in this field related to membrane preparation and their applications in separation processes are presented and discussed in this review. An overview of the different fabrication techniques of such membranes will be first provided. In addition, the formation mechanism and the parameters that can be varied to tune the properties of the membranes will be discussed. Finally, the potential applications of these membranes in different separation areas such as pervaporation, nanofiltration, solvent resistant nanofiltration, reverse osmosis, gas separation and forward osmosis will be addressed

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Section: Parameters That Influence the Lbl Assembly Of Pemsmentioning

confidence: 99%

Layer-by-layer preparation of polyelectrolyte multilayer membranes for separation

et al. 2014

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“…All these applications can be hindered by the nature of PAH. The physicochemical properties of PAH, which is a weak polyelectrolyte, are strongly pH and ionic strength dependent . The presence of primary amines along the polymer backbone makes PAH highly cytotoxic .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of strong polycations with improved biological properties

Wytrwał-Sarna

Koczurkiewicz

Wójcik

et al. 2013

J Biomedical Materials Res

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Poly(allylamine hydrochloride) (PAH) has found many applications both in biotechnology and biomedical fields. However, its high toxicity toward various mammalian cells significantly limits its effective usage. This study focuses on improving the biological properties of PAH by its modification to strong polyelectrolytes. The strong polycations were prepared by the direct quaternization of PAH amino groups or by the attachment of glycidyltrimethylammonium chloride to these groups. The biological properties, such as cytotoxicity toward human skin fibroblasts (HSFs), proliferation and migration of the cells on a polymeric surface, and antibacterial activities against two pathogenic bacteria, Staphylococcus aureus and Escherichia coli, were determined. All the modified polyelectrolytes are considerably less toxic to HSFs as compared to PAH. Moreover, the directly quaternized polycations are stronger biocides against S. aureus than the parent polymer. Contrary to PAH, thin films of the modified polyelectrolytes improve or do not affect HSFs proliferation and can stimulate cell migration into the wound, as was demonstrated using an in vitro model. The relationship between the structure of the modified polymers (amount and localization of the quaternary ammonium groups) and the biological activity is discussed. Due to the improved biological properties, the obtained polycations may be potentially useful for a variety of biotechnological and biomedical applications.

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“…The imidazole sidechains of His has pK a closer to physiological pH, which may vary the charge as a result of relatively small shifts in cellular pH. For this reason, this amino acid sidechain finds its way into considerable use as a coordinating ligand in metalloproteins, and also as a catalytic site in certain enzymes . The permeation studies of His solution through the multilayer membrane was carried out at three selected pHs, 10.6 (above pI), 7.6 (pI), and 5 (below pI).…”

Section: Resultsmentioning

confidence: 99%

Transport properties and morphology of CHI/PSS multilayered microfiltration membranes for the low pressure filtration of amino acids

Mathew

Gopalakrishnan

Aravindakumar

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND As amino acids provide a green feedstock for the synthesis of chemicals, their isolation through low energy route sounds encouraging. RESULTS The changes in the permeation characteristics of microfiltration (MF) membranes with the deposition of a few bilayers of chitosan (CHI) and polystyrene sulfonate (PSS) for the low pressure filtration (∼0.69 bar) of selected amino acids glycine, histidine, lysine and aspartic acid is reported here. Glycine, with minimal electrostatic interaction with the multilayer film, is almost completely transmitted. Among the basic amino acids, lysine was isolated to a larger extent at both pI (pH 9.5, 7 bilayer, 67.8%) and below pI (pH 5, 7 bilayer, 96.4%). Aspartic acid was also isolated at both feed pHs (pH 5, 93.6%). Donnan effects operate in a different manner in both cases. At pH 5, lysine is adsorbed to the membrane as counter ions, whereas aspartic acid is excluded as co‐ion from the film. The morphological features of membranes are illustrated through histogram, skewness, and Minkowski measures using AFM. CONCLUSIONS The present study brings forward the possibility of cutting down the filtration pressure to a lower value for the isolation of small molecules like amino acids by water based coating of a few bilayers on MF membranes. © 2016 Society of Chemical Industry

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Nonlinear growth of multilayer films formed from weak polyelectrolytes

Cited by 46 publications

References 31 publications

Layer-by-layer preparation of polyelectrolyte multilayer membranes for separation

Layer-by-layer preparation of polyelectrolyte multilayer membranes for separation

Synthesis of strong polycations with improved biological properties

Transport properties and morphology of CHI/PSS multilayered microfiltration membranes for the low pressure filtration of amino acids

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