Surface Dynamics of Polymer Films

Kim, Hyun-Jung; Rühm, Adrian; Lurio, Laurence; Basu, J. K.; Lal, J.; Lumma, D.; Mochrie, S. G. J.; Sinha, Sunil K.

doi:10.1103/physrevlett.90.068302

Cited by 175 publications

(224 citation statements)

References 19 publications

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“…A couple of the remarkable studies will be reviewed here. The overdamped capillary waves of polystyrene films are observed by Kim et al 60) and Jiang et al, 61,62) and they discussed the relation between the mobility of the polymer chains and the thickness of the film. Madsen et al observed the dispersion relation of the capillary waves on liquid surface near the transition point from oscillating to overdamped behavior.…”

Section: X-ray Photon Correlation Spectroscopymentioning

confidence: 92%

“…Surface tension, one of the most important physical properties of surface, is predicted to have spatial scale dependence (q dependence) in microscopic scale due to the atomic or molecular effect by the density functional theory for capillary wave fluctuations. 68,69) XPCS today can access up to q $ 5 Â 10 À2 nm À1 and down to t $ 10 0 s for capillary waves of polystyrene films 60) and the behavior can be described by macroscopic fluid mechanics. Damping rate of capillary waves in microscopic region q $ 1 nm À1 is estimated faster than t $ 10 À4 s by conventional fluid mechanics.…”

Section: Perspective Of Xpcsmentioning

confidence: 99%

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Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

et al. 2013

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In the present review, we focus on the characterization of polymer brushes by quantum beam, which is regarded as a promising probe of surface and interface analysis. The polymer brushes were prepared on various shapes of surface, and proved to be benefit to various applications. Among them, the polymer brushes grafted on sphere nanoparticles and flat substrates are investigated as representative cases. The static structure of polymer brushes, especially the chain dimension of polymer brushes grafted on nanoparticles and a flat substrate, have been studied by small angle X-ray scattering (SAXS) and neutron reflectivity (NR), respectively. The microscopic dynamical properties of polymer brushes are also expected to be revealed by quantum beam. X-ray photon correlation spectroscopy (XPCS), a technique using a coherent X-ray, is one of the promising methods for microscopically understanding of dynamical properties of polymer brushes. Some of our recent studies about dynamical behavior of polymer brush immobilized nanoparticle by XPCS are also presented.

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Section: X-ray Photon Correlation Spectroscopymentioning

confidence: 92%

Section: Perspective Of Xpcsmentioning

confidence: 99%

Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

et al. 2013

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“…Further, assuming validity of Stokes-Einstein (SE) relation, which is expected to hold at measurement temperatures which are ∼ 50-60 K above T g , as has been shown earlier for thin polymer films, 33 we can write τ ∼…”

Section: (A)-2(b))mentioning

confidence: 99%

Anomalous Viscosity Reduction and Hydrodynamic Interactions of Polymeric Nanocolloids in Polymers

et al. 2015

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One of the central dogma of fluid physics is the no-slip boundary condition whose validity has come under scrutiny, especially in the fields of micro and nanofluidics.Although various studies show the violation of the no-slip condition its effect on flow of colloidal particles in viscous media has been rarely explored. Here we report unusually large reduction of effective viscosity experienced by polymeric nano colloids moving through a highly viscous and confined polymer, well above its glass transition temperature. The extent of reduction in effective interface viscosity increases with decreasing temperature and polymer film thickness. Concomitant with the reduction in effective viscosity we also observe apparent divergence of the wave vector dependent hydrodynamic interaction function of these colloids with an anomalous power law * To whom correspondence should be addressed † Indian Institute of Science ‡ Albert-Ludwig-University of Freiburg ¶ Deutsches Elektronen Synchrotron DESY 1 exponent of ∼ 2 at the lowest temperatures and film thickness studied. Such strong hydrodynamic interactions are not expected for polymeric colloidal motion in polymer melts. We suggest hydrodynamics, especially slip present at the colloid-polymer interface which determines the observed reduction in interface viscosity and presence of strong hydrodynamic interactions.

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“…This requires a preliminary knowledge of the fluid viscosity, which can be obtained by applying the same method with a different geometry. Actually, levelling has already been used to measure viscosity [13,14], assuming no slip at the fluid-solid interface and referring to the analytical solution for free-surface profiles with infinitesimal amplitudes, but without an evaluation of the approximations involved. This point is analysed here.…”

Section: Introductionmentioning

confidence: 99%

On using the levelling of the free surface of a Newtonian fluid to measure viscosity and Navier slip length

Pierre

Teyssèdre

2013

Proc. R. Soc. A.

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Measuring the relaxation time involved in the levelling of a free surface of a Newtonian fluid laid on a substrate can give access to material parameters. It is shown here how most favourable pattern geometries of the free surface and film thicknesses can be defined for the measures of viscosity and Navier slip length at the fluid-solid interface, respectively. Moreover, we put special emphasis on the conditions required to avoid shear thinning by controlling the maximum shear rate. For initially sinusoidal patterns with infinitesimal amplitudes, an analytical solution including slip at the fluid-solid interface is used, and numerical simulations based on the natural element method allow one to discuss the effect of finite amplitudes. This leads to the definition of a relevance domain for the analytical solution that avoids the need for numerical simulations in practical applications. It is also shown how these results can be applied to crenelated profiles, where Fourier series expansion can be used, but with caution.

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Surface Dynamics of Polymer Films

Cited by 175 publications

References 19 publications

Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

Anomalous Viscosity Reduction and Hydrodynamic Interactions of Polymeric Nanocolloids in Polymers

On using the levelling of the free surface of a Newtonian fluid to measure viscosity and Navier slip length

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