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  • 1990-1994  (7)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Electrostatic trapping of a colloidal monolayer near a charged wall (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1480-1486 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structure of a model colloidal suspension in the vicinity of a charged wall is studied in the framework of the Derjaguin–Landau–Verwey–Overbeek interaction potential and the hypernetted-chain approximation. Here we consider the case of dilute suspension of highly charged macroparticles interacting with weakly repulsive, neutral, and attractive walls. As the wall–particle electrostatic interactions become successively less repulsive, the formation of a monolayer of colloidal particles, strongly adsorbed onto the surface, is predicted by our results. This monolayer of electrostatically confined particles mimic the effect of an effective surface charge distribution adjacent to the wall which, together with the bare wall surface charge, induces on the other, nonconfined, colloidal particles the same local-concentration profile as that in front of a highly charged and repulsive wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rescaled mean spherical approximation for wall–particle correlations in colloidal suspensions (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2109-2115 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The idea of the rescaled mean spherical approximation (RMSA) is extended to describe the local concentration profile of a suspension of highly charged particles near a charged wall. The predictions of this essentially analytic approximation for the wall–particle correlations, under conditions that the "rescaling'' is needed, are in excellent quantitative agreement with those of the HNC approximation. It is found that the structure of the inhomogeneous suspension (the magnitude and relative spacing of the oscillations in the local macroparticle concentration, as a function of the distance from the wall) only depends on the bulk properties of the suspension. The charge density of the wall only contributes to determine the displacement of this local structure away from the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459036
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Random phase approximation for complex charged systems: Application to copolyelectrolytes (polyampholytes) (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 507-517 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study binary polyelectrolytes in the melt state and in concentrated solutions using the random phase approximation (RPA). We compute the thermodynamics and electrostatics of chemically linked polyelectrolytes chains into block copolymer molecules (copolyelectrolytes). Polyelectrolytes blends and copolyelectrolytes in the presence of free ions have Debye–Hückel-type effective monomer–monomer interactions, even when the polymer chains are not charged. Copolyelectrolyte of chemically linked chains of opposite charge in the absence of counterions, have ion–ion effective interactions characteristic of a dielectric medium, contrary to the case of polyelectrolyte blends where these effective interactions are Debye–Hückel type, even on the absence of free ions. The dielectric constant in such a diblock copolymer melt is proportional to the square of the degree of polymerization Np. In the reference state (without interactions) RPA assumes random walk statistics, which are nearly unperturbed in the dielectric; we find the scaling of the end-to-end vector square of a chain in the dielectric. We also discuss the physics of other copolyelectrolytes (polyampholytes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466965
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration profiles of a colloidal mixture near a charged wall (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2006-2011 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structure of a model two-component colloidal mixture in the vicinity of a charged wall is studied in the framework of the Derjaguin–Landau–Verweg–Overbeek potential and the hypernetted-chain approximation for the particle–particle and wall–particle direct correlation functions as the closure for the bulk and wall–particle Ornstein–Zernike equations. It is found that for strongly repulsive walls the structure of the inhomogeneous mixture near the wall only depends on the bulk parameters. For neutral and attractive walls, a monolayer of colloidal particles adjacent to the wall is formed. Depending on the charge asymmetry between the two colloidal species, the composition of this monolayer indicates a preferential electrostatic adsorption of the more highly charged species. For large charge asymmetry between the two species, a distinct segregation effect is predicted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461804
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of a colloidal suspension confined in a planar slit (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8337-8345 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present a simple theoretical scheme to calculate the inhomogeneous structure of an aqueous monodisperse suspension of highly charged spherical particles confined between two parallel charged walls. The theoretical model is based on the Derjaguin–Landau–Verwey–Overbeek level of description for the particle–particle and wall–particle interactions. The main features of the theoretically predicted local-concentration profile are found to be in good agreement with our Monte Carlo simulations for the same model. In particular, in the limiting case of large wall-to-wall separation, the predictions of previous work, concerning the structure of a suspension in the neighborhood of a highly repulsive wall, are found to agree with our simulation results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461260
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Rescaled mean spherical approximation for a colloidal suspension confined in a planar slit (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5747-5755 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper an extension of the rescaled mean spherical approximation is presented, which describes the local concentration profile of a colloidal suspension of charged particles confined between two parallel highly repulsive walls. The predictions of this scheme are in good quantitative agreement with those of the hypernetted-chain approximation. It is found that, for a given set of values of the bulk parameters, the structure of the concentration profile only depends on the value of the minimum of the external potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464867
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Electrostatic adsorption of colloidal particles on the walls of a planar slit: Simulation versus theory (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 8712-8721 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A simple theoretical scheme is employed to calculate the equilibrium local concentration profile of a model suspension of highly charged colloidal particles inside a planar slit in the regime corresponding to attractive and weakly repulsive wall–particle interactions. In addition, we report the results of Monte Carlo simulations for the same system and conditions. As expected from previous theoretical work involving a single confining wall, we find that in this regime, theory and simulations predict the existence of an electrostatically adsorbed monolayer of colloidal particles on each of the two confining walls of the slit, and that this is independent of the wall-to-wall separation. Furthermore, we find that this monolayer "renormalizes'' the charge of the corresponding wall, thus producing the same structure of the nonadsorbed particles, as that produced by highly repulsive walls. This idea is shown to be quantitatively accurate according to both, the simulation and the theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463390
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    Paper (German National Licenses)
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