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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of polymers in solution: the role of time-dependent hydrodynamic interactions (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 5997-6005 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00022a015
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of rodlike polymers in dilute solution (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 2550-2561 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00062a025
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  • 3
    Electronic Resource
    Electronic Resource
    Consistently averaged hydrodynamic interaction beyond the Oseen approximation for Rouse–Zimm–Bueche dumbbells in steady shear flow (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1248-1252 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of including corrections to the Oseen hydrodynamic interaction in the rheological properties of polymer solutions is investigated. The case of a dilute suspension of Rouse–Zimm–Bueche dumbbells in steady shear flow is examined within the consistent averaging approximation due to O¨ttinger [J. Chem. Phys. 83, 6535 (1985)]. A reduction of the values of the material functions as compared to the results obtained in the Oseen approximation is observed. The effect is most important at zero shear rate and the highest allowed value of the hydrodynamic interaction parameter. It decreases when either the shear rate is increased or the hydrodynamic interaction parameter is lowered. The ratio of the second to the first normal stress coefficients is always a small positive quantity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454245
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrodynamic effects in polymer solutions. I. Friction coefficients in steady elongational flow (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 7964-7969 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hydrodynamic drag on the spherical beads of a dilute suspension of multibead–spring–rod chains immersed in a Newtonian solvent in steady elongational flow is calculated with the method of induced forces. Hydrodynamic interactions between the beads cause the drag to be anisotropic in space while the friction tensors exhibit a nonanalytic dependence on the velocity gradient when nonlinear terms in the quasistatic Navier–Stokes equation are considered. A discussion of the differences with the phenomenological form usually adopted in polymer dynamics is given and potential applications of the results in rheology are highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454253
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  • 5
    Electronic Resource
    Electronic Resource
    Nonequilibrium translational-rotational effects in nucleation (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 7100-7106 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The role that translational-rotational degrees of freedom play in nucleation theories is reconsidered by the introduction of a new formalism that properly accounts for the effects of motion of clusters in nucleation rate. The analysis of the nonequilibrium kinetics of the process, performed by retaining the dynamics of the clusters, enables one to clarify some of the paradoxical aspects that the inclusion of these degrees of freedom has presented. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1405122
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  • 6
    Electronic Resource
    Electronic Resource
    Chaining in magnetic colloids in the presence of flow (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 6443-6448 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We discuss the effect of an homogeneous flow in the aggregation process of colloidal magnetic particles at moderate concentration. Situations in which the presence of flow acts in favor of the chaining process: particles assemble into chains larger than the ones emerging in the absence of flow, under the only influence of an externally imposed field, have been analyzed. The results we obtain follow from the analysis of the pair correlation function which, owing to the potential character of the flow we consider, can be interpreted in terms of a Boltzmann-type stationary distribution function. To render the influence of the flow on the resulting structures explicit, we study the particular cases of axisymmetric and planar elongational flows. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1308541
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  • 7
    Electronic Resource
    Electronic Resource
    Frequency-dependent viscosity of a ferrofluid (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3812-3819 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have analyzed the viscoelastic behavior of a suspension of ferromagnetic particles. The dynamics of the correlations of the magnetic moment of the particle follows from the corresponding Smoluchowski equation, which generates a hierarchy of equations coupling the consecutive moments. Different decoupling approximations are proposed and studied. The viscosity has been calculated and found to depend on frequency and magnetic field. Our results have been compared to experiments carried out for a suspension with certain polidispersity, reproducing the decay of this coefficient when increasing the frequency. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468562
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  • 8
    Electronic Resource
    Electronic Resource
    Kramers-type picture for crystal nucleation (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 5987-5993 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We introduce a new scheme to analyze the kinetics of homogeneous nucleation in terms of a global order parameter. Our approach is based on the application of the internal degrees of freedom formalism to derive a kinetic equation of the Kramers type formulated for a global reaction coordinate. We provide explicit expressions for the quantities and coefficients involved in the process, suitable for simulation. In addition, our picture recovers in the quasistationary case the transition rate obtained from the method of reactive flux. The equation we present may provide a link between theoretical approaches to homogeneous nucleation (generally formulated in terms of a kinetic equation of the Fokker–Planck type) and simulations (which mostly employ linear response theory). In this context, our scheme provides a theoretical framework to interpret and extend the results obtained in recent simulations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477224
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  • 9
    Electronic Resource
    Electronic Resource
    Low temperature viscosity in elongated ferrofluids (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 10253-10259 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the relaxation and transport properties of a ferrofluid in an elongational flow. These properties are influenced by the bistable nature of the potential energy. Bistability comes from the irrotational character of the flow together with the symmetry of the dipoles. Additionally, the presence of a constant magnetic field destroys the symmetry of the potential energy magnetizing the system. We have shown that at a moderate temperature, compared to the height of the energy barrier, the viscosity decreases with respect to the value it would have if the potential were stable. This phenomenon is known as the "negative viscosity" effect. Thermal motion induces jumps of the magnetic moment between the two stable states of the system leading to the aforementioned lowered dissipation effect. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474165
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  • 10
    Electronic Resource
    Electronic Resource
    Periodic modulation induced increase of reaction rates in autocatalytic systems (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7367-7374 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We propose a new mechanism to increase the reactions rates in multistable autocatalytic systems. The mechanism is based upon the possibility for the enhancement of the response of the system due to the cooperative behavior between the noise and an external periodic modulation. In order to illustrate this feature we compute the reaction velocities for the particular case of the Sel'Kov model, showing that they increase significantly when the periodic modulation is introduced. This behavior originates from the existence of a minimum in the mean first passage time, one of the signatures of stochastic resonance. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476156
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