Light‐Driven Self‐Healing of Nanoparticle‐Based Metamolecules

Nan, Fan; Yan, Zijie

doi:10.1002/ange.201814060

Cited by 6 publications

(3 citation statements)

References 41 publications

(27 reference statements)

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“…In 2018, the formation of an optically evolved assembly was also reported by trapping 200 nm Au NPs . Initially, the NPs were optically trapped and aligned perpendicular to the linearly polarized laser inside the focal spot due to optical binding. − These NPs were arranged like a Yagi–Uda antenna, which can efficiently scatter the trapping laser outside the focus. , We proposed that this scattered light traps more NPs further outside the focus, and these NPs can scatter the trapping laser even further away. Such trapping and scattering events cooperatively connect the Au NPs and dynamically evolve the optical potential, forming a huge network through multiple scattering processes.…”

Section: Introductionmentioning

confidence: 97%

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

et al. 2021

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Optical trapping at an interface mediates the gathering and assembling of particles, inducing the so-called optically evolved assembly that can expand outside the laser focus due to multiple scattering processes. In previous studies, we reported that the so-called Au nanoparticle (NP) dynamically evolving assembly has a dumbbell shape, in which the Au NPs fluctuate in a cooperative fashion, like a swarm of bees. The shape and the size of such an assembly can be controlled from a physicochemical point of view, considering the intrinsic surface plasmon resonance properties of Au NPs. In this work, we will demonstrate that changing the optical conditions of trapping represents an alternative approach for controlling the shape of the swarming NPs. Strikingly, we observe two new appearances of the swarm with elliptical and ring distribution of particles by shifting the axial position of the trapping laser focus with respect to the interface. Indeed, we can modify the outline of the assemblies by displacing the dynamic equilibrium between the different "optically evolved assembly" states. Moreover, the contours of the dumbbell state can be further controlled by the incident and focusing angles of the electromagnetic radiation used in the trapping process. The results are elucidated in terms of the considerable scattering force that arises from the momentum transfer between photons and Au NPs. This work shows the importance of the momentum direction of incident photons at the interface, establishing critical steps to comprehensively control the "optically evolved assembly" phenomena, which has a large potential in research fields such as soft matter or colloidal chemistry.

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Section: Introductionmentioning

confidence: 97%

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

et al. 2021

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“…89 Intrinsic self-healing approaches rely on the inherent restoring ability of self-healing materials where reversible covalent bonds, 90,91 supramolecular chemistry, 92,93 and physical interactions 94 can be exploited to achieve reversibility. Extrinsic self-healing approaches employ the external container in the form of capsules, 95 vascular networks, 96 nanoparticles, 97 and hollow fibers 98 that are embedded in the matrix during production. Among these, capsule-based method is the most commonly used extrinsic self-healing approach and we will focus on this microcapsule-based self-healing approach to emphasize the role of the mechanical properties of microcapsules.…”

Section: Self-healingmentioning

confidence: 99%

Mechanical characterization of soft microparticles prepared by droplet microfluidics

Kim

Lee

2022

Journal of Polymer Science

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Droplet microfluidics is one of the most promising approaches that allows preparation of microparticles with tailored structure and composition. Various functional microparticles have been developed using microfluidics, where their controlled structure shows high potential for a wide range of applications. Among these, soft polymeric microparticles which exhibit low elastic modulus compared to ceramics and metals are extensively investigated in biomedical applications due to their biocompatibility, high surface‐to‐volume ratio, as well as soft and deformable nature. As the mechanical properties of soft microparticles play important role in determining how they function in each application, it is essential to adequately characterize them for the optimal design of functional microparticles. In this review, we mainly discuss the mechanical characterization methods of soft microparticles and their elastic property. A brief overview of the droplet microfluidics‐assisted fabrication of microparticles is also provided before discussing the mechanical characterization techniques. We then describe the general characterization methods and models employed to determine the elastic properties of microparticles. In addition, we discuss the relationship between the physical parameters (size, composition, and structure) and the elastic properties of the microparticles, followed by the role of elastic properties in various applications including microcarrier, bioink, and self‐healing to name a few.

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“…One prominent example concerns optical binding and optical matter formation in weakly focused and circularly polarized laser light. Multiple plasmonic nanoparticles subject to these conditions spontaneously self-organize into various nonequilibrium twodimensional (2D) configurations (22,23), revealing intriguing phenomena, such as negative optical torque (24)(25)(26) and self-healing effects (27), originating in the mutually scattered light between neighboring nanoparticles. However, these works were based on the self-assembly of spherical nanoparticles, for which individual particle orientations cannot be determined.…”

Section: Introductionmentioning

confidence: 99%

Synchronization of optically self-assembled nanorotors

Cui,

Mylnikov,

Johansson

et al. 2024

Sci. Adv.

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Self-assembly of nanoparticles by means of interparticle optical forces provides a compelling approach toward contact-free organization and manipulation of nanoscale entities. However, exploration of the rotational degrees of freedom in this process has remained limited, primarily because of the predominant focus on spherical nanoparticles, for which individual particle orientation cannot be determined. Here, we show that gold nanorods, which self-assemble in water under the influence of circularly polarized light, exhibit synchronized rotational motion at kilohertz frequencies. The synchronization is caused by strong optical interactions and occurs despite the presence of thermal diffusion. Our findings elucidate the intricate dynamics arising from the transfer of photon spin angular momentum to optically bound matter and hold promise for advancing the emerging field of light-driven nanomachinery.

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Light‐Driven Self‐Healing of Nanoparticle‐Based Metamolecules

Cited by 6 publications

References 41 publications

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

Photon Momentum Dictates the Shape of Swarming Gold Nanoparticles in Optical Trapping at an Interface

Mechanical characterization of soft microparticles prepared by droplet microfluidics

Synchronization of optically self-assembled nanorotors

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