Complexation and distribution of counterions in a grafted polyelectrolyte layer

Tran, Yvette; Auroy, P.

doi:10.1007/s101890170088

Cited by 25 publications

(22 citation statements)

References 25 publications

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“…Annealed brushes affixed to planar surfaces have therefore been the subject of intense theoretical research, [40,41,[43][44][45][46][47][48][49] while the number of experimental studies devoted to these systems is still rather small. [53][54][55][56][57][58][59] …”

Section: Spherical Polyelectrolyte Brushesmentioning

confidence: 99%

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Nanoscopic Polymer Particles with a Well‐Defined Surface: Synthesis, Characterization, and Properties

Ballauff

2003

Macro Chemistry & Physics

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We review our recent work on polymeric latex particles having a well‐defined surface of grafted polymers. Two types of particles are discussed: i) particles with a thermosensitive shell, and ii) particles bearing a dense layer of linear polyelectrolyte chains on their surface (“spherical polyelectrolyte brush”). Both types of particles consist of a polystyrene core onto which either linear or crosslinked chains are grafted. The synthesis of these core–shell particles proceeds in a two‐step process which is reviewed in detail. In particular, we discuss the photo‐emulsion polymerization used for the synthesis of the spherical polyelectrolyte brushes. Most of the studies of these particles have been done in aqueous suspension. Here the equilibrium structure of the surface layer of the particles has been investigated by dynamic light scattering and by small‐angle X‐ray scattering. Results deduced from the flow behavior of the particles in dilute solution can directly be derived from static data. Very recent data refer to the interaction of the spherical polyelectrolyte brushes with solid interfaces. It is demonstrated that particles bearing positively charged polyelectrolyte chains interact strongly with negatively charged surfaces. The strong interaction that is directly evident from AFM studies can be used to generate 2D networks of the particles on the surface.

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Section: Spherical Polyelectrolyte Brushesmentioning

confidence: 99%

“…[53][54][55][56][57][58][59][60] A review of this work has been given recently by Dubreuil and Guenon. [60] The term brush denotes a planar or curved surface onto which linear polymer or polyelectrolyte chains are grafted densely.…”

Section: Introductionmentioning

confidence: 99%

Nanoscopic Polymer Particles with a Well‐Defined Surface: Synthesis, Characterization, and Properties

Ballauff

2003

Macro Chemistry & Physics

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“…This technique has been applied to brushes prepared using both grafting-to 8,10,[35][36][37] and grafting-from methods. Recently, a number of studies have been performed of grafted-from brushes prepared using methacrylate ATRP, focusing on a variety of weak pH-responsive brushes 11,21,34,38,39 , as well as strong polyelectrolyte brushes 21,40,41 and polyampholytes 22 .…”

Section: Introductionmentioning

confidence: 99%

Structure and Collapse of a Surface-Grown Strong Polyelectrolyte Brush on Sapphire

et al. 2012

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We have used neutron reflectometry to investigate the behavior of a strong polyelectrolyte brush on a sapphire substrate, grown by atom transfer radical polymerization (ATRP) from a silane-anchored initiator layer. The initiator layer was deposited from vapor, following treatment of the substrate with an Ar/H 2 O plasma to improve surface reactivity. The deposition process was characterized using X-ray reflectometry, indicating the formation of a complete, cross-linked layer. The brush was grown from the monomer [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC), which carries a strong positive charge. The neutron reflectivity profile of the swollen brush in pure water (D 2 O) showed that it adopted a two-region structure, consisting of a dense surface region ∼ 100 Å thick, in combination with a diffuse brush region extending to around 1000 Å from the surface. The existence of the diffuse brush region may be attributed to electrostatic repulsion from the positively-charged surface region, while the surface region itself most probably forms due to polyelectrolyte adsorption to the hydrophobic initiator layer. The importance of electrostatic interactions in maintaining the brush region is confirmed by measurements at high (1 M) added 1:1 electrolyte, which show a substantial transfer of polymer from the brush to the surface region, together with a strong reduction in brush height. On addition of 10 -4 M oppositely-charged surfactant (sodium dodecyl sulfate SDS), the brush undergoes a dramatic collapse, forming a single dense layer about 200 Å in thickness, which may be attributed to the neutralization of the monomers by adsorbed dodecyl sulfate ions in combination with hydrophobic interactions between these dodecyl chains. Subsequent increases in surfactant concentration result in slow increases in brush height, which may be caused by stiffening of the polyelectrolyte chains due to further dodecyl sulfate adsorption.3

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“…Grafted onto solid surfaces they can form polyelectrolyte brushes. Their conformation and dynamics were studied extensively by theory [1][2][3][4][5][6][7][8][9][10], simulation [11][12][13][14][15], and a manifold of different experimental techniques such as neutron scattering techniques [16], x-ray [17,18] and neutron reflectivity measurements [19], infrared spectroscopy [20], small angle neutron scattering [21], dynamic light scattering [22], and ellipsometry [23]. Force measurements were carried out using the surface forces apparatus [24 -29] or the colloidal probe technique [30,31].…”

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confidence: 99%

Forces of Interaction between DNA-Grafted Colloids: An Optical Tweezer Measurement

2007

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Optical tweezers are employed to measure the forces of interaction between single DNA-grafted colloids. Parameters to be varied are the length of the DNA, the grafting density, and the ion concentration of the surrounding medium. From the measured force-separation dependence an interaction length at a given force is deduced. It shows in the mushroom regime a scaling with the grafting density which levels off for brushes. For the latter the transition from an osmotic to a salted brush can be traced in detail by varying the ion concentration in accordance with mean field theories.

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Complexation and distribution of counterions in a grafted polyelectrolyte layer

Cited by 25 publications

References 25 publications

Nanoscopic Polymer Particles with a Well‐Defined Surface: Synthesis, Characterization, and Properties

Nanoscopic Polymer Particles with a Well‐Defined Surface: Synthesis, Characterization, and Properties

Structure and Collapse of a Surface-Grown Strong Polyelectrolyte Brush on Sapphire

Forces of Interaction between DNA-Grafted Colloids: An Optical Tweezer Measurement

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