Photoswitchable Dissipative Two‐Dimensional Colloidal Crystals

Vialetto, Jacopo; Anyfantakis, Manos; Rudiuk, Sergii; Morel, Mathieu; Baigl, Damien

doi:10.1002/ange.201904093

Cited by 13 publications

(9 citation statements)

References 46 publications

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“…All in all, our study opens the way for the investigation of microgels at the interface as a simple realization of 2D elastic particles. We expect that the evidence reported here will have important consequences on the study of twodimensional elastic objects at the fundamental level [90,91] and for the clever design of composite materials [92][93][94].…”

Section: Discussionmentioning

confidence: 81%

Microgels at Interfaces Behave as 2D Elastic Particles Featuring Reentrant Dynamics

et al. 2020

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Soft colloids are increasingly used as model systems to address fundamental issues such as crystallization and the glass and jamming transitions. Among the available classes of soft colloids, microgels are emerging as the gold standard. Since their great internal complexity makes their theoretical characterization very hard, microgels are commonly modeled, at least in the small-deformation regime, within the simple framework of linear elasticity theory. Here we show that there exist conditions where its range of validity can be greatly extended, providing strong numerical evidence that microgels adsorbed at an interface follow the two-dimensional Hertzian theory, and hence behave like 2D elastic particles, up to very large deformations, in stark contrast to what found in bulk conditions. We are also able to estimate Young's modulus of the individual particles and, by comparing it with its counterpart in bulk conditions, we demonstrate a significant stiffening of the polymer network at the interface. Finally, by analyzing dynamical properties, we predict multiple reentrant phenomena: By a continuous increase of particle density, microgels first arrest and then refluidify due to the high penetrability of their extended coronas. We observe this anomalous behavior in a range of experimentally accessible conditions for small and loosely cross-linked microgels. The present work thus establishes microgels at interfaces as a new model system for fundamental investigations, paving the way for the experimental synthesis and research on unique highdensity liquidlike states. In addition, these results can guide the development of novel assembly and patterning strategies on surfaces and the design of novel materials with desired interfacial behavior.

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Section: Discussionmentioning

confidence: 81%

Microgels at Interfaces Behave as 2D Elastic Particles Featuring Reentrant Dynamics

et al. 2020

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“…All in all, our study opens the way for the investigation of microgels at the interface as a simple realization of 2D elastic particles. We expect that the evidence reported here will have important consequences on the study of two-dimensional elastic objects at the fundamental level [78,79] and for the clever design of composite materials [80][81][82].…”

Section: Discussionmentioning

confidence: 81%

Microgels at interfaces behave as 2D elastic particles featuring reentrant dynamics

Camerin,

Gnan,

Ruiz-Franco

et al. 2020

Preprint

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Soft colloids are increasingly used as model systems to address fundamental issues such as crystallisation and the glass and jamming transitions. Among the available classes of soft colloids, microgels are emerging as the gold standard. Since their great internal complexity makes their theoretical characterization very hard, microgels are commonly modelled, at least in the small-deformation regime, within the simple framework of linear elasticity theory. Here we show that there exist conditions where its range of validity can be greatly extended, providing strong numerical evidence that microgels adsorbed at an interface follow the two-dimensional Hertzian theory, and hence behave like 2D elastic particles, up to very large deformations. We are also able to estimate the Young's modulus of the individual particles and, appropriately comparing with its counterpart in bulk conditions, we demonstrate a significant stiffening of the polymer network at the interface. Finally, by analyzing dynamical properties, we predict multiple reentrant melting phenomena in experimentally accessible conditions: by a continuous increase of particle density, microgels first arrest and then re-fluidify due to the high penetrability of their extended coronas. The present work establishes microgels at interfaces as a new model system for fundamental investigations, paving the way for the experimental synthesis and research on unique high-density liquid-like states. In addition, these results can guide the development of novel assembly and patterning strategies on surfaces and the design of novel materials with desired interfacial behavior.

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“…44 Photoresponsive media based on azobenzene surfactants allowing for the transient self-assembly of differently sized particles have also been developed. 45 Emerging Applications Finally, we will discuss the emerging applications of materials formed via DSA, 46 focusing on those that have been demonstrated for both chemically fueled and light-fueled DSA (Figure 4, top and bottom panel, respectively). At the same time, we wish to emphasize that these applications derive mostly from the differences in the properties of the initial, disassembled state (n X) on the one hand, and, on the other hand, the assembled state X n * -and not necessarily the high-energy state X n .…”

Section: Kinetic Trapsmentioning

confidence: 99%