Colloidal Spherocylinders at an Interface: Flipper Dynamics and Bilayer Formation

Li, T.; Brandani, Giovanni B.; Marenduzzo, Davide; Clegg, Paul S.

doi:10.1103/physrevlett.119.018001

Cited by 20 publications

(31 citation statements)

References 30 publications

(24 reference statements)

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“…More sophisticated in silico , models lead to the microgel structures with polydisperse subchains which can fit scattering curves better than the ideal network, and the monolayers composed of such particles could show a behavior closer to that of the experimental systems (both with more or less homogeneous inner structure depending on the synthetic approach). Nevertheless, the captured features of monolayers ( i.e ., sensitivity to the change of cross-linking density, mass, and the compatibility with liquids) composed of the ideal microgels are not affected too much with this issue similar to the monolayers of solid colloids, and thus we may say that qualitatively both models reveal similar physical phenomena.…”

Section: Resultsmentioning

confidence: 95%

Compression and Ordering of Microgels in Monolayers Formed at Liquid–Liquid Interfaces: Computer Simulation Studies

Bushuev

Gumerov

Bochenek

et al. 2020

ACS Appl. Mater. Interfaces

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Monolayers of polymer microgels adsorbed at the liquid interfaces were studied by dissipative particle dynamics simulations. The results demonstrated that the compressibility of the monolayers can be widely tuned by varying the cross-linking density of the microgels and their (in)compatibility with the immiscible liquids. In particular, the compression of the monolayers (increase of 2D concentration of the microgels) leads to the decrease of their lateral size. Herewith, the shape of the individual soft particles gradually changes from oblate (diluted 2D system) to nearly spherical (compressed monolayer). The polymer concentration profiles plotted along the normal to the interface reveal a nonmonotonous shape with a sharp maximum at the interface. This is a consequence of the shielding effect: saturation of the interface by monomer units of the subchains is driven by minimization of unfavorable contacts between the immiscible liquids and is opposed by elasticity of the network. The decrease of the interfacial tension upon concentration (compression) of the monolayer is quantified. It has been demonstrated that the interfacial tension significantly differs if the solubility of the polymer chains of the microgel network in the liquids changes. These results correlate well with experimental data. The examination of the microgels' crystalline ordering in monolayers demonstrated a nonmonotonous dependency on the compression degree (microgel concentration). Finally, the worsening of the solvent quality leads to the collapse of the microgels in monolayer and nonmonotonous behavior of the interfacial tension.

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Section: Resultsmentioning

confidence: 95%

Compression and Ordering of Microgels in Monolayers Formed at Liquid–Liquid Interfaces: Computer Simulation Studies

Bushuev

Gumerov

Bochenek

et al. 2020

ACS Appl. Mater. Interfaces

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show abstract

“…Expulsion of particles in the subphase was also observed in this system, and the monolayer buckled upon further compression. Experiments and simulations show that monolayers of spherocylinders buckle for small aspect ratio of the particles, while flipping of individual particles and bilayer formation is observed for large aspect ratio [57]. For particles with anisotropic surface chemistry, a comparison of homogenous polystyrene particles with gold-polystyrene Janus colloids of the same size reveals that while the homogeneous particles form monolayers that buckle upon compression, the Janus particles form bilayers upon monolayer collapse due to the anisotropic particle-particle and particle-interface interactions [55].…”

Section: Buckling Of Monolayersmentioning

confidence: 97%

Collapse mechanisms and extreme deformation of particle-laden interfaces

Garbin

2019

Current Opinion in Colloid & Interface Science

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“… 19 The structural evolution of nanoparticle monolayers upon compression has been the subject of numerous studies. 11 − 13 , 18 , 20 It is now well understood that, for strong area compression, the monolayer deforms out of the plane of the interface, leading to buckling of the monolayer, 12 , 13 or particle expulsion. 9 A commonly used method to determine the microstructure of Langmuir monolayers is the Langmuir–Blodgett technique, where a sample is lifted off the interfacial film onto a solid substrate, and imaged ex situ by transmission electron microscopy.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Organization of Ligand-Grafted Nanoparticles during Adsorption and Surface Compression at Fluid–Fluid Interfaces

et al. 2017

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Monolayers of ligand-grafted nanoparticles at fluid interfaces exhibit a complex response to deformation due to an interplay of particle rearrangements within the monolayer, and molecular rearrangements of the ligand brush on the surface of the particles. We use grazing-incidence small-angle X-ray scattering (GISAXS) combined with pendant drop tensiometry to probe in situ the dynamic organization of ligand-grafted nanoparticles upon adsorption at a fluid–fluid interface, and during monolayer compression. Through the simultaneous measurements of interparticle distance, obtained from GISAXS, and of surface pressure, obtained from pendant drop tensiometry, we link the interfacial stress to the monolayer microstructure. The results indicate that, during adsorption, the nanoparticles form rafts that grow while the interparticle distance remains constant. For small-amplitude, slow compression of the monolayer, the evolution of the interparticle distance bears a signature of ligand rearrangements leading to a local decrease in thickness of the ligand brush. For large-amplitude compression, the surface pressure is found to be strongly dependent on the rate of compression. Two-dimensional Brownian dynamics simulations show that the rate-dependent features are not due to jamming of the monolayer, and suggest that they may be due to out-of-plane reorganization of the particles (for instance expulsion or buckling). The corresponding GISAXS patterns are also consistent with out-of-plane reorganization of the nanoparticles.

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Colloidal Spherocylinders at an Interface: Flipper Dynamics and Bilayer Formation

Cited by 20 publications

References 30 publications

Compression and Ordering of Microgels in Monolayers Formed at Liquid–Liquid Interfaces: Computer Simulation Studies

Compression and Ordering of Microgels in Monolayers Formed at Liquid–Liquid Interfaces: Computer Simulation Studies

Collapse mechanisms and extreme deformation of particle-laden interfaces

Dynamic Organization of Ligand-Grafted Nanoparticles during Adsorption and Surface Compression at Fluid–Fluid Interfaces

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