Dynamics of Adsorbed Hairy-Rod Polymer Solutions

Loppinet, Benoît; Petekidis, George; Fytas, G.; Rulkens, Ron; Wegner, Gerhard

doi:10.1021/la980445p

Cited by 17 publications

(14 citation statements)

References 7 publications

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“…12, the initial relaxation rate of the field-auto correlation function depends linearly on Q In all EWLS-instruments described so far 1,17,19,23,24 , it is only possible to change α r , which will vary both Q and Q ⊥ simultaneously. We therefore used a three axis goniometer as the mechanical basis for our set up, which was custom-made by Huber Diffraktionstechnik, Rimsting, Germany.…”

Section: Ewdls-setupmentioning

confidence: 97%

Colloidal dynamics near a wall studied by evanescent wave light scattering: Experimental and theoretical improvements and methodological limitations

Holmqvist

Dhont

Láng

2007

The Journal of Chemical Physics

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The dynamics of colloidal spheres near to a wall is studied with an evanescent wave scattering setup that allows for an independent variation of the components of the scattering wave vector normal and parallel to the wall. The correlation functions obtained with this novel instrumentation are interpreted on the basis of an expression for their short time behavior that includes hydrodynamic interactions between the colloidal spheres and the wall. The combination of the evanescent wave scattering set-up and the exact expression for the short-time behavior of correlation functions allows for an unambiguous measurement of the particle mobility parallel and normal to the wall by means of light scattering. It is possible to measure the viscous wall drag effect on the dynamics of particles with radii as small as 27 nm, where however, the method to reaches it's limits due to the low scattering intensities of such small particles.

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Section: Ewdls-setupmentioning

confidence: 97%

Colloidal dynamics near a wall studied by evanescent wave light scattering: Experimental and theoretical improvements and methodological limitations

Holmqvist

Dhont

Láng

2007

The Journal of Chemical Physics

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“…An investigation of the interface dynamics of the hairy rod polymer poly(p-phenylene (PPPS) in toluene for four number averaged contour lengths L n = 11…134 nm was performed by Loppinet et al [68]. Adsorption from a semidilute solution led to equilibration within 20 h. By a variation of the angle of incidence around φ 0 , distinct differences in g 1 (t) for bulk DLS (φ < φ 0 , refracted beam in medium 2) and EWDLS sensitive to the interface (φ > φ 0 , EW in medium 2) were http://doc.rero.ch observed.…”

Section: Polymers and Brushes At A Solid Interfacementioning

confidence: 99%

Light scattering near and from interfaces using evanescent wave and ellipsometric light scattering

Sigel

2009

Current Opinion in Colloid & Interface Science

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The broad range of interface light scattering investigations in recent years shows the power and the versatility of these techniques to address new and open questions in colloid and interface science and the soft condensed matter field. Structural information for polymers, liquid crystals, or colloids close to planar or spherical colloidal interfaces are either captured with long range light scattering resolution, or in a complementary approach by high resolution ellipsometric techniques. Of special interest is the dynamic behavior close to or in interfaces, since it determines material properties and responses to external fields. Due to the broad dynamical range and the high scattering contrast for visible light, interface light scattering is a key to elucidate soft matter interfacial dynamics. This contribution reviews experimental and related theoretical approaches for interface light scattering and further gives an overview of achievements based on such techniques.

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“…Therefore, a key question is how particle dynamics are affected through HI by the existence of nonpenetrable walls. Different techniques have been used to study near wall dynamics, including evanescent wave dynamic light scattering (EWDLS), [10][11][12][13][14][15][16] confocal optical microscopy, 17 total internal reflection microscopy, 18,19 resonance enhanced scattering, 20,21 and laser tweezers. 22 The hydrodynamic interactions between a planar solid surface and a nearby Brownian sphere have been calculated at the level of a single particle as early as the beginning of the 20th century 23 and latter in the 1960s.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering

Michailidou

Swan

Brady

et al. 2013

The Journal of Chemical Physics

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Evanescent wave dynamic light scattering and Stokesian dynamics simulations were employed to study the dynamics of hard-sphere colloidal particles near a hard wall in concentrated suspensions. The evanescent wave averaged short-time diffusion coefficients were determined from experimental correlation functions over a range of scattering wave vectors and penetration depths. Stokesian dynamics simulations performed for similar conditions allow a direct comparison of both the shorttime self-and collective diffusivity. As seen earlier [V. N. Michailidou, G. Petekidis, J. W. Swan, and J. F. Brady, Phys. Rev. Lett. 102, 068302 (2009)] while the near wall dynamics in the dilute regime slow down compared to the free bulk diffusion, the reduction is negligible at higher volume fractions due to an interplay between the particle-wall and particle-particle hydrodynamic interactions. Here, we provide a comprehensive comparison between experiments and simulations and discuss the interplay of particle-wall and particle-particle hydrodynamics in the self-and cooperative dynamics determined at different scattering wave vectors and penetration depths. © 2013 AIP Publishing LLC.

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Dynamics of Adsorbed Hairy-Rod Polymer Solutions

Cited by 17 publications

References 7 publications

Colloidal dynamics near a wall studied by evanescent wave light scattering: Experimental and theoretical improvements and methodological limitations

Colloidal dynamics near a wall studied by evanescent wave light scattering: Experimental and theoretical improvements and methodological limitations

Light scattering near and from interfaces using evanescent wave and ellipsometric light scattering

Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering

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