Langmuir Isotherms of Quenched and Annealed Polyelectrolyte Brushes

Prinz, Christelle; Muller, and P.; Maaloum, Mounir

doi:10.1021/la9916631

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…14 This can be attributed to the effect of the nonelectrostatic interactions between PAA chains. The nonmonotonic dependence of the undeformed brush thickness H 0 on the grafting density has also been observed by Prinz et al 9 in AFM measurements performed on tethered poly-(vinyl-2-pyridine) (P2VP) layers (weak polybase). The observed slope of the ln H 0 vs ln s dependence is close to 1 / 3 as predicted by the theory.…”

supporting

confidence: 67%

“…Recently, the normal forces between surfaces covered by end-grafted or irreversibly adsorbed polymer layers have become experimentally measurable in a surface force apparatus (SFA) [2][3][4][5][6][7][8] or by atomic force microscopy (AMF). 7,9 Compression of the adsorbed layer leads to an increase in the concentration of polymer and the corresponding increase in the osmotic pressure inside the layer. At relatively strong confinement, the excess osmotic pressure gives the dominant contribution to the restoring force.…”

mentioning

confidence: 99%

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Static Forces in Confined Polyelectrolyte Layers

2000

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supporting

confidence: 67%

mentioning

confidence: 99%

Static Forces in Confined Polyelectrolyte Layers

2000

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“…These findings establish that the inter-relationships between the surface pressure, subphase surface tension, and nature of the polyelectrolyte are quite complex. Caution must be exercised in assuming where a surface-tethered polyelectrolyte is localized with respect to the air/water interface (for example, see ref ). The XR experiment, as used here and in prior work, clearly establishes that the P4VP-based polyelectrolytes do not form a brush structure except under special conditions.…”

Section: Resultsmentioning

confidence: 99%

Observation of Surface Ordering of Alkyl Side Chains in Polystyrene/Polyelectrolytes Diblock Copolymer Langmuir Films

Shin¹,

Rafailovich²,

Sokolov³

et al. 2001

Langmuir

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Block polyelectrolytes P(Sx-b-VP/RXy) composed of polystyrene (PS) blocks (x ) 200, 260) and alkylated (R ) Cn) poly(vinylpyridine) (PVP) (X ) I or Br; y ) 119-270; n ) 4, 10, and 18) have been studied using the Langmuir film balance technique and in situ X-ray and neutron reflectivity measurements. Previous studies showed that the self-assembled surface micelles (with PS core and RPV + PXcorona) at the air/ water interface revealed a characteristic transition (when n > 6) without any significant hydration or the submersion of the corona chains. Combined X-ray and neutron reflectivity studies of P(Sx-b-VP/RXy) polyelectrolytes show that although the polyelectrolyte block is water soluble, it remains adsorbed to the water surface. The thickness of the adsorbed layer measured by X-ray reflectivity is in agreement with that measured using neutron reflectivity. This agreement indicates that the counterions are closely associated with the alkylated PVP chains, localized at the air/water interface, and are not distributed into the subphase. Reduction of the water subphase surface tension (using 1-5 vol % n-butanol) yields no change in the two-dimensional ordering of the surface micelles but increases the thickness of the corona layer to ca. 100 Å during film compression, indicating that the alkylated blocks become submerged into the subphase under these conditions. In situ Fourier transform infrared spectroscopy performed at the air/water interface establishes that for n ) 10 and 18, the alkyl chains adopt an ordered, all-trans state. However, no ordering is observed for n ) 4. These results clearly indicate that transition observed in the π-A isotherms is related to an order-disorder process of the alkyl side chains.

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“…Complicated isotherms have been recorded as a function of pH and added salt concentration, since in many cases charged segments adsorb onto the surface [24,25]. Only some limiting cases are easily confronted to the theory of ideal annealed brushes [9].…”

Section: Copolymers Spread At the Water-air Interfacementioning

confidence: 99%

Polyelectrolytes tethered to a free surface

Dubreuil

Guénoun

2001

The European Physical Journal E

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Several attempts have been already carried out in order to tether charged chains by an end at a free fluctuating surface. We review here most of these attempts and focus on how close the physics of charged brushes can be investigated by such an approach. We first describe results about films of chargedneutral diblock copolymers spread at the surface of water. Results can be mostly rationalized in terms of charged brushes although additional structurations and fluctuations of the interface can be observed. The latter deformations are also observed when adsorbed layers of charged-neutral diblock copolymers are considered. At last, we examine how free suspended films of charged-neutral diblock copolymers can be viewed as two opposing charged brushes, both in terms of thickness and pressure. PACS. 68.10.Cr Surface energy (surface tension, interface tension, angle of contact, etc.) -68.15.+e Liquid Thin Films -61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling

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Langmuir Isotherms of Quenched and Annealed Polyelectrolyte Brushes

Cited by 7 publications

References 21 publications

Static Forces in Confined Polyelectrolyte Layers

Static Forces in Confined Polyelectrolyte Layers

Observation of Surface Ordering of Alkyl Side Chains in Polystyrene/Polyelectrolytes Diblock Copolymer Langmuir Films

Polyelectrolytes tethered to a free surface

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