Absorption of Polyelectrolytes on Colloidal Surfaces as Studied by Electrophoretic and Dynamic Light-Scattering Techniques

Okubo, Tsuneo; Suda, Mitsuhiro

doi:10.1006/jcis.1999.6171

Cited by 26 publications

(18 citation statements)

References 21 publications

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“…10) ), though theoretical approaches are upcoming 31) . Kinetically controlled adsorption of polyelectrolytes must lead to overcompensation of the original surface charge, as shown experimentally by recording the f-potential [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] . Although the ESA technique is based on electrostatic attraction between positively and negatively charged species, the primary driving force is presumably entropy, not enthalpy.…”

Section: The Methods Of Electrostatic Layer-by-layer Selfassembly (Esa)mentioning

confidence: 98%

“…There seems to be a lower limit for the polymer concentration to allow ESA, which seems to be around 10 -7 mol/l for poly(styrene sulfonate) solutions under salt free conditions, somewhat depending on the nature of the substrate 33) . In case very low polyelectrolyte concentrations shall be applied, successful deposition under given conditions should be verified first.…”

Section: Experimental Conditions and Parametersmentioning

confidence: 96%

“…The influence of polyelectrolyte concentration on the adsorption step is generally weak if a critical threshold value is exceeded 29,33,46,63,77,351,427) , though this cannot be taken for granted 102,144) . There seems to be a lower limit for the polymer concentration to allow ESA, which seems to be around 10 -7 mol/l for poly(styrene sulfonate) solutions under salt free conditions, somewhat depending on the nature of the substrate 33) .…”

Section: Experimental Conditions and Parametersmentioning

confidence: 97%

“…18 d. The roughness of the top layer can range from molecularly flat 38,177,184) to several nanometers 33,46,184) . Diffusion experiments 33,46,250,251) and studies with the Surface Forces Apparatus 75,426) indicate a looser molecular packing.…”

Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 99%

See 3 more Smart Citations

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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Section: The Methods Of Electrostatic Layer-by-layer Selfassembly (Esa)mentioning

confidence: 98%

Section: Experimental Conditions and Parametersmentioning

confidence: 96%

Section: Experimental Conditions and Parametersmentioning

confidence: 97%

Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

“…This method thereby reveals the anomalous behaviors in overcharging MBs with added cationic polyelectrolyte. The stoichiometry that isoelectric colloid-PE complexes have ubiquitously obeyed so far [16,18] is actually invalid for compensating MB-charges with oppositely charged PEs. Ample cations of PEs must be added, resulting in the delayed formation of neutralized complexes that are surrounded by a sea of cationic chains.…”

Section: Discussionmentioning

confidence: 99%

A Non-stoichiometric Universality in Microbubble-Polyelectrolyte Complexation

Frusawa

Yoshida

2012

J. Phys. Soc. Jpn.

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We investigated the fundamental electrical properties of microbubbles (MBs) that are directly encapsulated by the addition of oppositely charged polyelectrolytes (PEs). Charge-reversal of the MB-PE complex particles has been observed by the microscopic electrophoresis method, revealing unusual overcharging behaviors in MB-PE complex solutions, as follows. The critical concentrations of cationic PEs added for overcharging were not only independent of their chain lengths and molecular species, but also much larger than stoichiometric neutralization points. Thus, we provide a theoretical sketch that considers the adsorption-desorption kinetics of small anions on the surface of genuine microbubbles, which can explain the inefficient charge-reversal.

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Electrosteric Stabilization of Al2O3, ZrO2, and 3Y–ZrO2 Suspensions: Effect of Dissociation and Type of Polyelectrolyte

Pettersson

Marino

Pursiheimo

et al. 2000

Journal of Colloid and Interface Science

111

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Absorption of Polyelectrolytes on Colloidal Surfaces as Studied by Electrophoretic and Dynamic Light-Scattering Techniques

Cited by 26 publications

References 21 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

A Non-stoichiometric Universality in Microbubble-Polyelectrolyte Complexation

Electrosteric Stabilization of Al2O3, ZrO2, and 3Y–ZrO2 Suspensions: Effect of Dissociation and Type of Polyelectrolyte

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