Effect of Polymer on the Contact Line Friction of a Capillary Bridge

Lee, Eunsang; Müller‐Plathe, Florian

doi:10.1021/acs.macromol.1c02539

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…The above picture becomes more involved when the spreading fluid is complex, such as a polymer solution (Lee & Müller-Plathe 2022), a polymeric melt (Seemann et al 2005) or a viscoplastic material (Spaid & Homsy 1996). Such fluids can have intrinsic time scales (e.g.…”

Section: Introductionmentioning

confidence: 99%

Probing dissipation in spreading drops with granular suspensions

2023

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In this paper, we study the spreading of droplets of density-matched granular suspensions on the surface of a solid. Bidispersity of the particle size distribution enriches the conclusions drawn from monodisperse experiments by highlighting key elements of the wetting dynamics. In all cases, the relation between the dynamic contact angle and the velocity of the contact line is similar to that for a simple fluid, despite the complexity introduced by the presence of particles. We extract from this relation an apparent wetting viscosity of the suspensions that differs from that measured in the bulk. Dimensional analysis supported by experimental measurements yields an estimate of the size of the region inside the droplet where the value of the dynamic contact angle depends on a balance of viscous dissipation and capillary stresses. How particle size compares with this viscous cut-off length seems crucial in determining the value of the apparent wetting viscosity. With bimodal blends, the particle size ratio can be used to show the effects of the local structure and volume fraction at the contact line, both impacting the value of the corresponding wetting viscosity.

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Section: Introductionmentioning

confidence: 99%

Probing dissipation in spreading drops with granular suspensions

2023

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“…Then, Soleymaniha and Felts used atomic force microscopy (AFM) to study the spreading dynamics of molten polystyrene (PS) drops on various solid substrates, and dissipation mechanisms were also considered through the MKT and HD. Recently, Lee and Müller-Plathe performed an interesting numerical study of capillary bridges of polymer solutions and concluded that the wetting behavior is dependent on the local polymer concentrations near the contact line and the contact line friction is affected by the strongly surface-adsorbed polymer molecules. In these polymer systems, the chemical reaction is deliberately avoided.…”

Section: Introductionmentioning

confidence: 99%

Reactive Spreading Dynamics of Molten Polymer Liquids

Zhang

Guo

et al. 2023

Macromolecules

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Despite the key to the adhesion between polymers and a plethora of materials, our understanding of reactive wetting is still rudimentary. In the present work, we report the reactive wetting dynamics of molten maleic anhydride-grafted polypropylene (MA-g-PP) liquids modeled by molecular-kinetic theory (MKT). The dependencies of the contact line friction (ζ) and viscosity (η) were compared for reactive and nonreactive wetting polymer systems. Compared with linear dependencies of ζ and η for the nonreactive wetting systems, the reactive wetting system presented a nonlinear relationship. In the capillary regime, the chemistry-affected regime is followed by a regime that is nearly not affected by chemical reactions, which is identified by the linear MKT. The formation of a new interface and the resulting entanglements of polymer chains in the chemistry-affected regime contribute to the dependence of ζ on η in the capillary regime.

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“…This force was the unbalanced contact line force per unit length that arose from a contact angle different from Young’s equilibrium contact angle. Researchers have adapted this idea to model shearing bridges between flat plates using multibody dissipative particle dynamics simulations, surface energy minimization, lattice Boltzmann simulations, and experiments. , Similarly, it has successfully been used to model the tangential force arising from sliding drops. – In both cases, the advancing and receding contact angles have been included in the tangential force equations. However, there is still a need to investigate the link between contact angle hysteresis and tangential forces for capillary bridges with changing heights.…”

Section: Introductionmentioning

confidence: 99%

“…In 1925, Adam and Jessop introduced a "line tension" that acted like friction to prevent contact line motion. 17 between flat plates using multibody dissipative particle dynamics simulations, 18 surface energy minimization, 19 lattice Boltzmann simulations, 20 and experiments. 19,21 Similarly, it has successfully been used to model the tangential force arising from sliding drops.…”

Section: Introductionmentioning

confidence: 99%

Hysteretic Behavior of Capillary Bridges between Flat Plates

Odunsi,

Morris,

Shattuck

2023

Langmuir

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We studied the evolution of capillary bridges between nominally flat plates undergoing multiple cycles of compression and stretching in experiments and simulations. We varied the distance between the plates in small increments to study the full evolution of the bridge shape. Experiments show that contact angle hysteresis determines the shape of the bridge. In sliding drops, hysteresis can be modeled using a contact angle-dependent resistive force F ̃R applied at the contact line. We developed a model that accurately captures the evolution of the bridge shape by combining F ̃R and constrained energy minimization. Unlike previous work, this allows for both complete and partial contact line pinning. We also explored the effect of using nonparallel plates. The asymmetry in the bridge shape causes the movement of the center of mass of the bridge and can be explained by contact angle hysteresis. We find that even a slight misalignment between the flat plates can have a measurable effect.

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Effect of Polymer on the Contact Line Friction of a Capillary Bridge

Cited by 10 publications

References 45 publications

Probing dissipation in spreading drops with granular suspensions

Probing dissipation in spreading drops with granular suspensions

Reactive Spreading Dynamics of Molten Polymer Liquids

Hysteretic Behavior of Capillary Bridges between Flat Plates

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