Nonmonotonic Effect of Ionic Strength on Surface Dye Extraction during Dye−Polyelectrolyte Multilayer Formation

Linford, Matthew R.; Auch, Mark Dai Joong; Möhwald, Helmuth

doi:10.1021/ja972133z

Cited by 117 publications

(87 citation statements)

References 18 publications

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“…Quartz plates were used as substrates for the multilayer films which were cleaned as described in ref. 15) One pair of initial buffer layer of poly-(ethyleneimine) and then of poly(sulfopropylmethacrylate) was adsorbed onto the quartz substrates prior to the adsorption of the various polyelectrolytes under study. The multilayer films were assembled by alternating dipping of the substrates into the solutions of the polyanions and the polycations for 20 min each.…”

Section: Methodsmentioning

confidence: 99%

Layer-by-layer self-assembly of hydrophobically modified polyelectrolytes

Cochin

Laschewsky²

1999

Macromol. Chem. Phys.

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SUMMARY: Polymeric multilayer films are self-assembled by alternating electrostatic adsorption of a coloured polyanion and UV-labeled polycations which exhibit polysoap characteristics. Film thicknesses grow linearly with the adsorption cycles, albeit the films grown from salt-free aqueous solutions are very thin. Accordingly, the hydrophobically associating polymers decoil completely upon adsorption. The adsorption process is very sensitive to short drying or to intermittent storage periods. Also, the films are apparently prone to certain structural rearrangements. Reactive groups contained in the polyelectrolytes can be employed for reactions with low molar mass reagents diffusing in, but the reactivity of internal layers is limited. The reactions take place without disintegration of the films, on the contrary, the smoothness of the films is improved after the chemical reaction.

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Section: Methodsmentioning

confidence: 99%

Layer-by-layer self-assembly of hydrophobically modified polyelectrolytes

Cochin

Laschewsky²

1999

Macromol. Chem. Phys.

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“…3. Some standard polyelectrolytes frequently used for coatings grown by ESA electrolytes and tri-to tetravalent organic ions seem to be limiting cases 11,59,61,[79][80][81][82][83][84][85][86][87][88][89][90][91] . In such systems, successful deposition requires very carefully chosen parameters for the deposition process (see section: Experimental conditions and parameters).…”

Section: Polymers Suited For 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.

1,174

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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“…The alternate deposition of charged and watersoluble polymers onto a substrate (the driving force of which is their electrostatic complexation) is an important and frequently used technique [1][2][3][4][5][6][7][8][9][10] that can produce functionally modified substrate surfaces. In addition, as a fabrication process is simply the alternate immersion of a certain substrate into each different polymer aqueous solution, it will be used in practical material fields.…”

Section: Introductionmentioning

confidence: 99%