Soft particles at a fluid interface.

  title={Soft particles at a fluid interface.},
  author={Hadi Mehrabian and Jens Harting and Jacco H. Snoeijer},
  journal={Soft matter},
  volume={12 4},
Particles added to a fluid interface can be used as a surface stabilizer in the food, oil and cosmetic industries. As an alternative to rigid particles, it is promising to consider highly deformable particles that can adapt their conformation at the interface. In this study we compute the shapes of soft elastic particles using molecular dynamics simulations of a cross-linked polymer gel, complemented by continuum calculations based on linear elasticity. It is shown that the particle shape is… 
Dynamics and wetting behavior of soft particles at a fluid-fluid interface
We investigate the conformation, position, and dynamics of core-shell nanoparticles (CSNPs) composed of a silica core encapsulated in a cross-linked poly-N-isopropylacrylamide shell at a water-oil
Desorption energy of soft particles from a fluid interface.
The efficiency of soft particles to stabilize emulsions is examined by measuring their desorption free energy, i.e., the mechanical work required to detach the particle from a fluid interface, using coarse-grained molecular dynamics simulations.
Mesoscale simulation of soft particles with tunable contact angle in multicomponent fluids.
A method to simulate soft particles in a multicomponent fluid, both at and near fluid-fluid interfaces, based on the lattice Boltzmann method is proposed, and the error stemming from the fluid-structure coupling for the particle equilibrium shape when adsorbed onto a fluid- fluid interface is characterized.
Interfacial viscoelasticity and jamming of colloidal particles at fluid–fluid interfaces: a review
This paper reviews studies on the adsorption of colloidal particles at fluid-fluid interfaces, from both thermodynamic and mechanical point of views, and discusses the differences as compared with surfactants and polymers.
Capillary interactions between soft capsules protruding through thin fluid films.
The authors' measured menisci deformations and lateral capillary forces, which agree well with previous theoretical and experimental works in case of rigid particles, show that the deformations become smaller with increasing particle softness, resulting in weaker lateral interaction forces.
Soft Colloidal Particles at Fluid Interfaces
This works presents a critical revision of different physicochemical aspects involving the behavior of individual microgels confined at fluid interfaces, as well as the collective behaviors emerging in dense microgel assemblies.
Colloidal particles at fluid interfaces: behaviour of isolated particles.
The effects that a variation of the morphology and surface chemistry of a particle can have on its ability to adhere to a liquid interface, from a thermodynamic as well as a kinetic perspective, are explored.
Surface tension regularizes the crack singularity of adhesion.
It is shown that surface tension plays a crucial role even in stiff solids: Young's wetting angle emerges as a boundary condition and this regularizes the crack-like singularity at the edge of adhesive contacts.
Nano- and microparticles at fluid and biological interfaces
This work first discusses the interaction of single particles with interfaces and membranes, e.g. particles in external fields, non-spherical particles, and particles at curved interfaces, followed by interface-mediated interaction between two particles, many-particle interactions, interface and membrane curvature-induced phenomena, and applications.
Mesoscale simulations of Janus particles and deformable capsules in flow
This report studies Janus particles at a fluid-fluid interface using the Shan-Chen pseudopotential approach for multicomponent fluids in combination with a discrete element algorithm and studies the dense suspension of deformable capsules in a Kolmogorov flow by combining the lattice Boltzmann method with the immersed boundary method.


Interactions and stress relaxation in monolayers of soft nanoparticles at fluid-fluid interfaces.
The surface pressure is measured for a stable 2D interfacial suspension of nanoparticles grafted with ligands, and the interaction potential is extracted by comparison to Brownian dynamics simulations to provide insights into the ligand configuration at the interface.
Adsorption of soft particles at fluid interfaces.
These findings have implications for the adsorption of microgel particles at fluid interfaces and the performance of stimuli-responsive Pickering emulsions.
From adhesion to wetting of a soft particle
Using a thermodynamical approach, we calculate the deformation of a spherical elastic particle placed on a rigid substrate, under zero external load, and including an ingredient of importance in soft
Elasto-capillarity at the nanoscale: on the coupling between elasticity and surface energy in soft solids
The capillary forces exerted by liquid drops and bubbles on a soft solid are directly measured using molecular dynamics simulations. The force on the solid by the liquid near the contact line is
Detachment energies of spheroidal particles from fluid-fluid interfaces.
This work develops a simplified detachment energy model for spheroids which depends only on the particle aspect ratio and the height of the particle centre of mass above the fluid-fluid interface and uses lattice Boltzmann simulations to validate the model and provide quantitative evidence that the approach can be applied to simulate particle-stabilized emulsions.
Statics of polymer droplets on deformable surfaces.
The equilibrium properties of polymer droplets on a soft deformable surface are investigated by molecular dynamics simulations of a bead-spring model and a phenomenological free-energy calculation that accounts for the surface tensions and the compliance of the soft substrate is compared.
Molecular Dynamics Simulations of Surfactant Functionalized Nanoparticles in the Vicinity of an Oil/Water Interface
The localization of nanoparticles (NPs) at fluid/fluid interfaces has emerged as an effective self-assembly method. To understand the fundamentals of this localization mechanism, it is necessary to
Adhesion and Wetting of Nanoparticles on Soft Surfaces
We study adhesion of spherical and cylindrical nanoparticles on soft (gel-like) substrates using a combination of the molecular dynamics simulations and theoretical calculations. The substrate
Surface tension and contact with soft elastic solids.
It is shown that, whereas the Johnson-Kendall-Roberts theory holds for particles larger than a critical, elastocapillary lengthscale, it fails for smaller particles, and adhesion of small particles mimics the adsorption of particles at a fluid interface, with a size-independent contact angle between the undeformed surface and the particle given by a generalized version of the Young's law.