Jacco H. Snoeijer
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View article: Microbubble-based measurement of shear and loss moduli in polyacrylamide hydrogels at MHz frequencies
Microbubble-based measurement of shear and loss moduli in polyacrylamide hydrogels at MHz frequencies Open
Ultrasound contrast agent dynamics are governed by their nonlinear resonance and by the shell and medium viscoelasticity. Here, we use nonlinear bubble dynamics to assess polyacrylamide hydrogel rheology at strain rates >10 6 s −1 .
View article: Dynamics of Poro-viscoelastic Wetting with Large Swelling
Dynamics of Poro-viscoelastic Wetting with Large Swelling Open
The deposition of droplets onto a swollen polymer network induces the formation of a wetting ridge at the contact line. Current models typically consider either viscoelastic effects or poroelastic effects, while polymeric gels often exhibi…
View article: Soft Condensation
Soft Condensation Open
When moist air meets a cold surface, it creates a breath figure characterized by numerous small droplets. The central question is how the vapor flux is distributed between the growth of condensed drops and the nucleation of new ones. Here,…
View article: Collective effects in breath figures
Collective effects in breath figures Open
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View article: Sticking without Contact: Elastohydrodynamic Adhesion
Sticking without Contact: Elastohydrodynamic Adhesion Open
The adhesion between dry solid surfaces is typically governed by contact forces, involving surface forces and elasticity. For surfaces immersed in a fluid, out-of-contact adhesion arises due to the viscous resistance to the opening of the …
View article: Viscoelastic lubrication of a submerged cylinder sliding down an incline
Viscoelastic lubrication of a submerged cylinder sliding down an incline Open
Lubrication flows between two solid surfaces can be found in a variety of biological and engineering settings. In many of these systems, the lubricant exhibits viscoelastic properties, which modify the associated lubrication forces. Here, …
View article: Viscoelastic wetting transition: beyond lubrication theory
Viscoelastic wetting transition: beyond lubrication theory Open
The dip-coating geometry, where a solid plate is withdrawn from or plunged into a liquid pool, offers a prototypical example of wetting flows involving contact-line motion. Such flows are commonly studied using the lubrication approximatio…
View article: Viscoelastic lubrication of a submerged cylinder sliding down an incline
Viscoelastic lubrication of a submerged cylinder sliding down an incline Open
Lubrication flows between two solid surfaces can be found in a variety of biological and engineering settings. In many of these systems, the lubricant exhibits viscoelastic properties, which modify the associated lubrication forces. Here, …
View article: Sticking without contact: Elastohydrodynamic adhesion
Sticking without contact: Elastohydrodynamic adhesion Open
The adhesion between dry solid surfaces is typically governed by contact forces, involving surface forces and elasticity. For surfaces immersed in a fluid, out-of-contact adhesion arises due to the viscous resistance to the opening of the …
View article: Coalescence Dynamics
Coalescence Dynamics Open
The merging of two fluid drops is one of the fundamental topological transitions occurring in free surface flow. Its description has many applications, for example, in the chemical industry (emulsions, sprays, etc.), in natural flows drivi…
View article: Collective Effects in Breath Figures
Collective Effects in Breath Figures Open
Breath figures are the complex patterns that form when water vapor condenses into liquid droplets on a surface. The primary question concerning breath figures is how the condensing vapor is allocated between the growth of existing droplets…
View article: Viscoelastic wetting transition: beyond lubrication theory
Viscoelastic wetting transition: beyond lubrication theory Open
The dip-coating geometry, where a solid plate is withdrawn from or plunged into a liquid pool, offers a prototypical example of wetting flows involving contact-line motion. Such flows are commonly studied using the lubrication approximatio…
View article: Soft Condensation
Soft Condensation Open
When moist air meets a cold surface, it creates a breath figure characterized by numerous small droplets. The central question is how the vapor flux is distributed between the growth of previously condensed drops and the nucleation of new …
View article: Ring-shaped colloidal patterns on saline water films
Ring-shaped colloidal patterns on saline water films Open
We reveal that a spreading colloidal drop evolves into a ring-shaped pattern after it is deposited on a thin saline water film. Clustered colloidal particles aggregate into larger trapezoidally-shaped 'supraclusters'. Using a simple model …
View article: Viscoelastic wetting: Cox–Voinov theory with normal stress effects
Viscoelastic wetting: Cox–Voinov theory with normal stress effects Open
The classical Cox–Voinov theory of contact line motion provides a relation between the macroscopically observable contact angle, and the microscopic wetting angle as a function of contact-line velocity. Here, we investigate how viscoelasti…
View article: Pressure Anisotropy in Polymer Brushes and Its Effects on Wetting
Pressure Anisotropy in Polymer Brushes and Its Effects on Wetting Open
Polymer brushes, coatings consisting of densely grafted macromolecules, experience an intrinsic lateral compressive pressure, originating from chain elasticity and excluded volume interactions. This lateral pressure complicates a proper de…
View article: Coalescence of Elastic Blisters Filled with a Viscous Fluid
Coalescence of Elastic Blisters Filled with a Viscous Fluid Open
Pockets of viscous fluid coalescing beneath an elastic plate are encountered in a wide range of natural phenomena and engineering processes, spanning across scales. As the pockets merge, a bridge is formed with a height increasing as the p…
View article: Wetting ridge dissipation at large deformations
Wetting ridge dissipation at large deformations Open
Liquid drops slide more slowly over soft, deformable substrates than over rigid solids. This phenomenon can be attributed to the viscoelastic dissipation induced by the moving wetting ridge, which inhibits a rapid motion, and is called "vi…
View article: A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media
A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media Open
Understanding the ultrasound pressure-driven dynamics of microbubbles confined in viscoelastic materials is relevant for multiple biomedical applications, ranging from contrast-enhanced ultrasound imaging to ultrasound-assisted drug delive…
View article: Interfacial dripping faucet: generating monodisperse liquid lenses
Interfacial dripping faucet: generating monodisperse liquid lenses Open
We present a surface analog to a dripping faucet, where a viscous liquid slides down an immiscible meniscus. Periodic pinch-off of the dripping filament is observed, generating a succession of monodisperse floating lenses. We show that thi…
View article: A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media
A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media Open
Understanding the ultrasound pressure-driven dynamics of microbubbles confined in viscoelastic materials is relevant for multiple biomedical applications, ranging from contrast-enhanced ultrasound imaging to ultrasound-assisted drug delive…
View article: Viscoelastic wetting: Cox-Voinov theory with normal stress effects
Viscoelastic wetting: Cox-Voinov theory with normal stress effects Open
The classical Cox-Voinov theory of contact line motion provides a relation between the macroscopically observable contact angle, and the microscopic wetting angle as a function of contact line velocity. Here we investigate how viscoelastic…
View article: Reversal of Solvent Migration in Poroelastic Folds
Reversal of Solvent Migration in Poroelastic Folds Open
Polymer networks and biological tissues are often swollen by a solvent such that their properties emerge from a coupling between swelling and elastic stress. This poroelastic coupling becomes particularly intricate in wetting, adhesion, an…
View article: Coalescence of bubbles in a viscoelastic liquid
Coalescence of bubbles in a viscoelastic liquid Open
When two bubbles submerged in a liquid are brought closely together, the intermediate liquid film separating the bubbles begins to drain. Once the film ruptures, the bubbles coalesce and form a neck that expands with time. The dynamics of …
View article: Drop impact on viscous liquid films
Drop impact on viscous liquid films Open
When a liquid drop falls on a solid substrate, the air layer between them delays the occurrence of liquid–solid contact. For impacts on smooth substrates, the air film can even prevent wetting, allowing the drop to bounce off with dynamics…
View article: Drawing liquid bridges from a thin viscous film
Drawing liquid bridges from a thin viscous film Open
A particle is trapped by the capillary forces in the meniscus after being brought into contact with a liquid film. We experimentally show that these capillary forces are time-dependent, highlighting the importance of dynamics on adhesion.
View article: Adhesive creases: bifurcation, morphology and their (apparent) self-similarity
Adhesive creases: bifurcation, morphology and their (apparent) self-similarity Open
An elastic material that experiences strong compression can exhibit sharp surface folds, often seen in growing tissues or swelling gels. We resolve how self-adhesion affects both morphology and bifurcation behavior of the adhesive crease.
View article: Rapid viscoelastic spreading
Rapid viscoelastic spreading Open
We investigate the rapid spreading dynamics of a viscoelastic drop on a solid. Upon contact, surface tension drives a fast motion of the contact line along the substrate. Here we resolve this motion for viscoelastic liquids by experiments …
View article: Pressure anisotropy in polymer brushes and its effects on wetting
Pressure anisotropy in polymer brushes and its effects on wetting Open
Polymer brushes, coatings consisting of densely grafted macromolecules, experience an intrinsic lateral compressive pressure, originating from chain elasticity and excluded volume interactions. This lateral pressure complicates a proper de…
View article: Enhanced dip coating on a soft substrate
Enhanced dip coating on a soft substrate Open
A solid, withdrawn from a wetting liquid bath, entrains a thin liquid film. This simple process, first described by Landau, Levich, and Derjaguin (LLD), is commonly observed in everyday life. It also plays a central role in liquid capture …