Polyelectrolyte Adsorption From Saline Solutions

Marra, Johan; Schee, H.A. van der; Fleer, G.J.; Lyklema, J.

doi:10.1016/b978-0-12-530980-6.50023-1

Cited by 32 publications

(30 citation statements)

References 12 publications

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“…8,78 An increase in ionic strength will reduce the effective charge on polymers by Debye-Hückel screening, 63 influencing the amount of material adsorbed. 79 Charge screening also promotes the formation of loops and thus more entangled polyelectrolytes and thicker film layers. 57 Explicit treatment of the discrete nature of charges on the polymers may be crucial for modeling polyelectrolyte adsorption and multilayer buildup, particu- Charges screened, radius of gyration small, chain flexible, and persistence length low "Loops" and increased packing density larly regarding the loss of conformational entropy on adsorption.…”

Section: Polyelectrolyte Multilayer Filmsmentioning

confidence: 99%

Physics of polypeptide multilayer films

Haynie

2006

J Biomed Mater Res

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Polypeptide multilayer films are promising for the development of coatings for implant devices, biosensors, and artificial cells. This paper discusses aspects of the physics of these films. Three sub-topics in the physics of peptide adsorption in multilayer film assembly covered here are peptide structure at the film/solid support interface, adsorbed layer thickness, and dynamics of peptide adsorption. A synopsis of work in these areas is preceded by an introduction to the subject and a review of some aspects of polymer theory.

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Section: Polyelectrolyte Multilayer Filmsmentioning

confidence: 99%

Physics of polypeptide multilayer films

Haynie

2006

J Biomed Mater Res

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“…Generally, two different pathways can be followed to attach a polyelectrolyte (PEL) monolayer to a solid surface: one where the chains are physically bound (physisorption) and the other where the chains are attached through establishment of a covalent bond between the substrate and the polymer (chemisorption). In the case of an attachment through physical interactions, the amount of adsorbed polymer and the conformation of the attached chains are controlled by the charge density of the polymer, the sign of the surface charge, the charge density, and the ionic strength of the solution from which the polymer is physisorbed. − The electrostatic repulsion between PEL molecules in water opposes the accumulation of polymer chains at the surface, and highly charged polymers adsorb only in small amounts to the substrate. This repulsion can at least partially be overcome if the electrostatic forces are screened through increasing the ionic strength of the solution from which the PEL is physisorbed by addition of low molecular weight electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of a Polyelectrolyte Monolayer Covalently Attached to a Planar Solid Surface

1999

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A novel concept for the synthesis of molecularly thin polyelectrolyte layers covalently attached to planar solid surfaces is introduced. The polymer monolayers are generated directly at the surface by using self-assembled monolayers of an azo initiator and radical chain polymerization in situ. This "grafting from" approach yields surface-bound polymer molecules with a high molecular weight and with high graft densities of the attached chains ("brush"-like state). As an example for the preparation of a positively charged polyelectrolyte "brush" at first a monolayer of poly(4-vinylpyridine) (PVP) was generated at the surface, which was subsequently quarternized to yield a poly[4-vinyl-N-n-butylpyridinium] bromide (BuPVP) monolayer. The thickness of this resulting cationic monolayer can be controlled in a wide range, starting from 2 nm to more than 1000 nm in the solvent-free state.

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“…For example, for adsorption of homopolymer poly(styrenesulfonate) on silica from aqueous solution, there is no detectable adsorption in the absence of salt, a consequence of the strong repulsion between charged groups on the polyelectrolyte, and adsorbed amounts are found to increase with increasing ionic strength (salt concentration), a consequence of the screening effect of salt on electrostatic interactions. 16 The range of electrostatic interactions is also expected to affect the aggregation characteristics of neutral-charged diblock copolymers on surfaces from aqueous solutions. Theoretical attempts to examine the properties of such adsorbed layers have been undertaken recently, using scaling laws and selfconsistent-field theory (SCF).5 '17 The layer is envisioned as consisting of an anchoring film of hydrophobic polymer at the solid surface and a brush of hydrophilic polyelectrolyte chains.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Hydrophilic-Hydrophobic Block Copolymers on Silica from Aqueous Solutions

Amiel¹,

Sikka²,

Schneider³

et al. 1995

Macromolecules

144

159

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Adsorption of a water-soluble diblock copolymer, poly(fert-butylstyrene)-sodium poly-(styrenesulfonate) (PtBS-NaPSS), on silica surfaces in aqueous solutions was studied using ellipsometry and atomic-force microscopy (AFM). The block copolymers used were compositionally asymmetric, with large, hydrophilic, PSS blocks and small, hydrophobic, PtBS blocks. Materials with molecular weights of 87 000 and 160 000 were used. Adsorption could not be observed in pure water without added salt (NaCl). When the NaCl concentration was increased to 1 M, adsorption could be readily observed. The measured adsorbed amount at long times was significantly larger for the 87 000 diblock compared with that for a polyelectrolyte homopolymer of comparable molecular size, demonstrating the role played by the uncharged block in anchoring the diblock at the solid surface. The kinetics of adsorption showed a two-stage process: an initial diffusion-limited stage, followed by a slower buildup of surface coverage in a brush-limited stage. The number density of molecules at the surface was smaller for the higher molecular weight species, in agreement with simple scaling arguments.f This work forms part of the Ph.D. dissertation of Mohan Sikka.

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Polyelectrolyte Adsorption From Saline Solutions

Cited by 32 publications

References 12 publications

Physics of polypeptide multilayer films

Physics of polypeptide multilayer films

Preparation and Characterization of a Polyelectrolyte Monolayer Covalently Attached to a Planar Solid Surface

Adsorption of Hydrophilic-Hydrophobic Block Copolymers on Silica from Aqueous Solutions

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