Morphology of multilayers assembled by electrostatic attraction of oppositely charged model polyelectrolytes

Kim, Dai Kyu; Han, Sang Woo; Kim, Chang Hwan; Hong, Jong‐Dal; Kim, Kwan

doi:10.1016/s0040-6090(99)00351-x

Cited by 55 publications

(58 citation statements)

References 35 publications

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“…Not surprisingly, layer-by-layer deposition gives rise to polymer films with alternating surface properties, such as contact angle 30,187,273,363,394,398,400,436) , chemical composition 35,227,239,383,398,437) , or f-potential 32, 34-41, 46, 92, 353) . Prepared films are typically not birefringent 15,32,58,80,81,88,89,110,135,138,254,255,431) , i. e. they are isotropic in the film plane (for an exception, see ref. 93) ), and very smooth 20,29,237,270,431) .…”

Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 99%

See 1 more Smart Citation

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,169

1,184

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A bit of historyThe key role of surfaces for many material properties as well as for many biological processes has been recognized now. Therefore, new strategies aim at the tailoring of the material's surface only -or of a thin surface layer, respectively -, while preserving the bulk properties of the underlying support. Particular emphasis has been given to the surface modification by polymers, in an attempt to extend the known versatility of polymer bulk materials to ultrathin films and coatings, and to prepare bulk-surface composite materials. The self-organization of polymers has been increasingly explored for the preparation of well-defined surfaces and interfaces in recent years, extending the use of the established methods of low molar mass compounds (for comparative reviews, see ref. 1-3)). With such techniques, polymer films are formed spontaneously on substrates, due to balanced interactions between substrate, polymer (or its precursor) and medium. Typically, very thin, often monomolecular layers are produced. Repetitive deposition steps provide a precise control over the total thickness of the coatings, in the range from a few angstroms up to the micrometer range. Moreover, the step-by-step procedures allow for a fine structuring in the third dimension. In addition to the preparation of uniform and homogeneous coatings, gratings, gradients or steps of defined height in molecular dimensions can be easily constructed.The most recent of the self-organization techniques is the alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA) [3][4][5][6][7][8][9][10] . Although some early, singular studies of self-assembly by alternating adsorption of oppositely charged polyions are reported [11][12][13] , a practical method for ESA was developed Feature Article: The article presents the state-of-the-art of alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA), for the preparation of thin polymer coatings. In comparison to other, more established self-organization techniques, this recent method is distinguished by its simplicity, versatility, and speed. In particular, the tendency for self-healing is unique. Emphasis is given to the role of the molecular structure of the polyelectrolytes, and to the nature of the support. Also, various parameters for the preparation of multilayer films are highlighted, which are very important due to the kinetic control of the build-up process. The structure of the resulting coatings, their quality and stability, chemical reactions in the films, and potential applications are discussed.Macromol. Rapid Commun. 21, No. 7

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Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 99%

“…Prepared films are typically not birefringent 15,32,58,80,81,88,89,110,135,138,254,255,431) , i. e. they are isotropic in the film plane (for an exception, see ref. 93) ), and very smooth 20,29,237,270,431) . Thicker films show interference colors, and X-ray reflectivity studies reveal typi- Fig.…”

Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 99%

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,169

1,184

View full text Add to dashboard Cite

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“…For example, it has been reported that multilayered films produced with high salt concentration are thicker, and have a higher surface roughness than without salt when obtained using the dipping LbL method. 8,9 Although a robust and well-tested processing route, it is generally recognized that the dipping LbL approach to multilayer deposition is excessively time-consuming-each complete process requiring hours to complete and robotic equipment for acceptable reproducibility. Additionally, it has been found that the dipping method yields a relatively high roughness, compared to methods introduced below, in the resulting multilayered thin coating.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte spin assembly: Influence of ionic strength on the growth of multilayered thin films

Lefaux

Zimberlin

Dobrynin

et al. 2004

J Polym Sci B Polym Phys

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Layer-by-layer (LbL) assembly of polymer electrolyte multilayers is now a well-established method for the fabrication of thin films by sequential adsorption of alternating layers of oppositely charged polyelectrolytes. Most commonly, such adsorptions have been from quiescent solutions of varying ionic strength and pH. Here, we report results on an alternative processing route for the achievement of polymeric multilayer assemblies of poly(sodium-4-styrene sulfonate) and poly(allylamine hydrochloride) that utilizes conventional spin coating. We investigated and describe herein the dependence of multilayer film buildup on solution ionic strength for comparison with similar dependence in quiescent adsorption. Using UV-Vis spectroscopy we monitored the growth of the multilayered films, while with Atomic Force Microscopy (AFM) we examined the surface features and measured coating thicknesses at different salt concentrations. AFM and UV-Vis data reveal two regimes of behavior with increasing salt: strong salt-dependence at low salt contents, and weak salt-dependence for high salt contents. To explain this observation, we introduce the relevance of the dimensionless group De ϭ ␥, the local Deborah Number, to the problem. As ionic strength increases, increases so that spin-assembly flow influences adsorbed conformation, and thus LbL growth rate. Our results indicate the ability to design and control polyelectrolyte multilayered structures prepared via spin assembly by varying solution properties that influence the conformation of deposited polymer chains. Additionally, our studies reveal the need for study of the fundamental mechanisms of polyelectrolyte adsorption within complex flow fields.

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“…Such systems have an obvious practical value, but they are also of great fundamental interest because of the properties of confined complex molecules, such as polyelectrolytes, which can be very different from their properties in the bulk [4]. To better understand and control the PEM formation, various properties of these systems, such as the effect of salt, pH, aggregation homogeneity, roughness, stability, and permeability [5][6][7][8][9][10][11], have been investigated. However, for many applications, especially when the film is deformed by shearing or for contact * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Surface viscoelastic properties of floating polyelectrolyte multilayers films: A capillary wave study

Safouane

Miller

Möhwald

2005

Journal of Colloid and Interface Science

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Morphology of multilayers assembled by electrostatic attraction of oppositely charged model polyelectrolytes

Cited by 55 publications

References 35 publications

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Polyelectrolyte spin assembly: Influence of ionic strength on the growth of multilayered thin films

Surface viscoelastic properties of floating polyelectrolyte multilayers films: A capillary wave study

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