Influence of hydrodynamic interactions on stratification in drying mixtures.

@article{Statt2018InfluenceOH,
  title={Influence of hydrodynamic interactions on stratification in drying mixtures.},
  author={Antonia Statt and Michael P. Howard and Athanassios Z. Panagiotopoulos},
  journal={The Journal of chemical physics},
  year={2018},
  volume={149 2},
  pages={
          024902
        }
}
Nonequilibrium molecular dynamics simulations are used to investigate the influence of hydrodynamic interactions on vertical segregation (stratification) in drying mixtures of long and short polymer chains. In agreement with previous computer simulations and theoretical modeling, the short polymers stratify above the long polymers at the top of the drying film when hydrodynamic interactions between polymers are neglected. However, no stratification occurs under the same drying conditions when… Expand
16 Citations
Stratification of drying particle suspensions: Comparison of implicit and explicit solvent simulations.
TLDR
"Small-on-top" stratification of the particles, with an enrichment of the smaller ones at the receding liquid-vapor interface during drying, is observed in both models under the same drying conditions. Expand
Control of Stratification in Drying Particle Suspensions via Temperature Gradients.
TLDR
Very strong small-on-top stratification can be produced with a positive thermal gradient in the drying suspension by thermalizing the vapor at a temperature higher than that of the solvent. Expand
Stratification in drying films: a diffusion–diffusiophoresis model
Abstract This research is motivated by the desire to control the solids distribution during the drying of a film containing particles of two different sizes. A variety of particle arrangements inExpand
A critical and quantitative review of the stratification of particles during the drying of colloidal films.
TLDR
The mechanisms by which colloidal mixtures can stratify during the drying process are outlined, and ways that microstructures can be designed and controlled in colloidal materials to achieve desired properties are pointed to. Expand
Classification of drying segregation states by a generalized diffusion model.
TLDR
The present model is the simplest representation that includes cross-diffusion between different particle components to describe the segregation and classify states in terms of which the particle component segregates for the following variables: the mixture ratio of particle components, diffusion coefficients, and drying rates. Expand
Temporal evolution of concentration and microstructure of colloidal films during vertical drying: a lattice Boltzmann simulation study.
TLDR
The qualitatively significant differences between LB and BD simulations at a moderate Pe indicate that hydrodynamic interactions (HIs) play an important role in this Pe, and the presence of HIs induces a greater reduction of diffusion than under geometrical restriction alone. Expand
Influence of Particle Shape on the Drying Regime Maps for Plate-like Particle-Polymer Composites.
TLDR
The particle geometry is oblate to determine the changes in the particle distribution in comparison to spherical particles and an expansion of the diffusion regime for the plate-like particles in comparison with spherical particles is shown. Expand
Segregation in Drying Binary Colloidal Droplets
TLDR
A comparison between experiments and simulations suggest that hydrodynamic interactions between the suspended colloids reduce the extent of stratification, which is relevant for the fabrication of supraparticles for applications in the fields of chromatography, catalysis, drug delivery, photonics, and a better understanding of spray-drying. Expand
Evaporation-induced assembly of colloidal crystals.
TLDR
Surprisingly, it is found that collective rearrangements of the bulk crystal during later stages of drying reduce the influence of the initial surface structure, and the final morphology is essentially independent of the evaporation rate. Expand
Colloidal assembly of polydisperse particle blends during drying.
TLDR
This work synthesizes a polydisperse aqueous colloidal system composed of small and large zwitterionic particles, as well as medium sized standard acrylic particles, and shows how these dispersions hold great potential to overcome the evaporation rate dependence of size segregation processes in drying colloidal blends. Expand
...
1
2
...

References

SHOWING 1-10 OF 49 REFERENCES
Dynamic Stratification in Drying Films of Colloidal Mixtures.
TLDR
A model is developed to show that a gradient in osmotic pressure, which develops dynamically during drying, is responsible for the segregation mechanism behind stratification of mixtures of large and small colloidal particles in water. Expand
Auto-stratification in drying colloidal dispersions: a diffusive model.
TLDR
A theory for this novel method of stratification during drying of a two component film has been derived and when one is above unity and the other below, maximum stratification is observed. Expand
Cross Interaction Drives Stratification in Drying Film of Binary Colloidal Mixtures.
TLDR
It is shown that the phenomenon of stratify, where smaller colloids are laid upon larger colloids, is caused by the interaction between the colloids and can be explained by a diffusion model accounting for the interaction among colloids. Expand
Stratification Dynamics in Drying Colloidal Mixtures.
TLDR
Interestingly, inverted stratification was observed even at moderate drying rates where the film Péclet numbers were comparable to unity, but the thickness of the stratified layer decreased, and a model based on dynamical density functional theory is proposed to explain the observed phenomena. Expand
Stratification in Drying Polymer-Polymer and Colloid-Polymer Mixtures.
TLDR
A theoretical model for the drying mixtures was developed based on dynamical density functional theory, which gave excellent quantitative agreement with the simulations for the polymer-polymer mixtures and qualitatively predicted the observed polymer-on-top or colloid- on-top structures for the colloids. Expand
Stratification and Size Segregation of Ternary and Polydisperse Colloidal Suspensions during Drying.
  • A. Fortini, R. Sear
  • Materials Science, Medicine
  • Langmuir : the ACS journal of surfaces and colloids
  • 2017
TLDR
This work investigates the drying process of three-component and polydisperse colloidal suspensions using Brownian dynamics simulations and proposes a model that predicts a power-law dependence of the phoretic velocity on particle size and shows good agreement. Expand
Stratification in Drying Films Containing Bidisperse Mixtures of Nanoparticles.
TLDR
The results of large scale molecular dynamics simulations for bidisperse nanoparticle suspensions with an explicit solvent reveal the importance of including the solvent explicitly when modeling evaporation-induced particle separation and organization and point to the important role of density gradients brought about by ultrafast evAPoration. Expand
Autostratification in drying colloidal dispersions: experimental investigations.
TLDR
The conditions that enhance particle stratification are found to be a colloidally stable dispersion, low initial volume fractions, a low concentration of the stratifying particle, and for the Peclet numbers of the two components to straddle unity. Expand
Stratification in binary colloidal polymer films: experiment and simulations.
TLDR
The conditions under which a stratified layer of small particles develops spontaneously in a colloidal film that is cast from a binary mixture of small and large polymer particles that are suspended in water are explored. Expand
Diffusion and viscosity equations of state for a Lennard-Jones fluid obtained from molecular dynamics simulations
Equilibrium molecular dynamics simulations were performed for a Lennard-Jones fluid at 171 conditions spanning the range 0≤p+≤1.0 and 0.8≤T+≤4.0. The Einstein or, mean-squared-displacement (MSD)Expand
...
1
2
3
4
5
...