Polyion conformation and second virial coefficient dependences on the ionic strength for flexible polyelectrolyte solutions

Mattoussi, Hedi; O'Donohue, Stephen; Karasz, Frank E.

doi:10.1021/ma00028a037

Cited by 18 publications

(16 citation statements)

References 7 publications

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“…Experimentally the OSF result, which suggests a quadratic dependence on the Debye length, κ −1 , for the electrostatic persistence length, has been confirmed for intrinsically very stiff polyelectrolytes, like DNA 15 and poly(xylylene tetrahydrothiophenium chloride) 16 , but although it has been claimed that the theory is also valid for long, flexible chains, 17,18 the experimental findings generally points towards a linear relationship, i.e. l p,e ∼ κ −1 , for flexible polyelectrolytes.…”

Section: Introductionmentioning

confidence: 75%

The electrostatic persistence length calculated from Monte Carlo, variational and perturbation methods

Ullner

Jönsson

Peterson

et al. 1997

The Journal of Chemical Physics

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Section: Introductionmentioning

confidence: 75%

The electrostatic persistence length calculated from Monte Carlo, variational and perturbation methods

Ullner

Jönsson

Peterson

et al. 1997

The Journal of Chemical Physics

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“…The molecular weight has been estimated previously in a study using small angle light scattering ͑SALS͒ from dilute solutions of pPPV in methanol, with M w Х8ϫ10 5 daltons. 40 SPS with a molecular weight M w Х7ϫ10 4 daltons was purchased ͑as powder͒ from Aldrich, while PMA with M w Х10 5 was purchased, also as a powder, from Polysciences Inc. These compounds have been used without further purification.…”

Section: A Organic Hole Transport Layer: Htlmentioning

confidence: 99%

Electroluminescence from heterostructures of poly(phenylene vinylene) and inorganic CdSe nanocrystals

Mattoussi

Radzilowski

Dabbousi

et al. 1998

Journal of Applied Physics

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533

380

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Electroluminescence ͑EL͒ and photoluminescence ͑PL͒ from heterostructure thin films made of organic poly ͑phenylene vinylene͒, PPV, and inorganic semiconductor CdSe nanocrystals are investigated. In these devices, the organic PPV structure is built next to an indium tin oxide anode, using the technique of molecular layer-by-layer sequential adsorption, and serves primarily as the hole transport layer. The inorganic layer, adjacent to an Al electrode, is made of spin cast CdSe nanocrystals, passivated with either organic groups or with a wider band gap semiconductor, e.g., ZnS in the present case. We find that the electroluminescence signal is almost exclusively generated within the inorganic layer, with a very weak contribution from the PPV layer at higher applied voltage. The performance of these heterostructure devices is influenced by the thickness of the dot layer. Lifetime tests reveal promising stability, with devices operating continuously over 50-100 h.Values of the external quantum efficiency, ext , as high as 0.1% are reached. The quantum efficiency is not enhanced by the presence of ZnS overcoating, as opposed to the observed increase in the PL quantum yield. This reflects a difference in the efficiency of charge injection into the nanocrystals due to the ZnS overlayer.

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“…Therefore, to study the PPV polymer and its blends, one has to pursue the solution behavior of PXT. 20,21 II. Revisit to de Gennes' Scaling Arguments 4 We introduced the concept of flexible polyelectrolyte chains into the de Gennes's scaling arguments 4 by assuming the polyelectrolyte chains to be a succession of segments (or blobs), each of which carries a g-number of monomers in a mesh of the semidilute solution.…”

Section: Introductionmentioning

confidence: 99%

A Simple Method To Estimate Chain Conformations of Polyelectrolytes in the Semidilute Regime

Lin

2000

Macromolecules

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In semidilute polyelectrolyte solutions, reduced viscosity (ηr) versus concentration (cp) plots follow the relation ηr ∼ cp n , where n is dependent on the chain conformations. Using de Gennes' scaling arguments, we show that the average end-to-end distance of a polyelectrolyte chain, R ) N ν a (N is the number of mers in a chain and a is the length per mer), can be estimated by ν ) (n + 2)/3(n + 1). The new scaling relation was employed to estimate the chain conformations of poly(xylylene tetrahydrothiophenium chloride) (PXT) in salt-free and salt-containing aqueous and methanol solutions.

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Polyion conformation and second virial coefficient dependences on the ionic strength for flexible polyelectrolyte solutions

Cited by 18 publications

References 7 publications

The electrostatic persistence length calculated from Monte Carlo, variational and perturbation methods

The electrostatic persistence length calculated from Monte Carlo, variational and perturbation methods

Electroluminescence from heterostructures of poly(phenylene vinylene) and inorganic CdSe nanocrystals

A Simple Method To Estimate Chain Conformations of Polyelectrolytes in the Semidilute Regime

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