Rugby-ball-like photonic crystal supraparticles with non-close-packed structures and multiple magneto-optical responses

Liu, Jingjing; Xiao, Ming-wen; Li, Chaoran; Hai, Li; Wu, Zhiyi; Zhu, Qishan; Tang, Rujun; Xu, Ao Bo; He, Le

doi:10.1039/c9tc05438c

Cited by 18 publications

(25 citation statements)

References 61 publications

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“…Combining the effect of size on the supraparticle shape with the size-based stratification of colloids in a mixture of large and small particles, ,, we are able to obtain supraparticles with not only nonspherical or asymmetric shapes but also stratified distribution of the colloidal particles inside the supraparticle. These findings can be important in many areas where asymmetry and anisotropy are crucial for the performance of supraparticles, for example, in optics , and magnetics ,, and in directional propulsion …”

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confidence: 89%

“…As a result of the assembly, the supraparticles gain additional functionality as compared to the colloidal building blocks they are made of. , In symmetric assemblies, the additional functionality is obtained by a collective response of the colloids, for instance, in optoelectronics, optics, and photonics, − catalysis, and drug delivery . Tuning the shape and introducing asymmetry and anisotropy in supraparticles can be important in applications where directionality is crucial. − Therefore, there is a need for the development of methods that are simple and scalable and that allow to precisely adjust the properties of the supraparticles. Here, we show that changing the size and composition of the colloidal building blocks can tune the shape and anisotropy of supraparticles, made through evaporating self-lubricating ouzo droplets as templates.…”

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confidence: 99%

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Particle Size Determines the Shape of Supraparticles in Self-Lubricating Ternary Droplets

et al. 2021

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Supraparticles are large clusters of much smaller colloidal particles. Controlling the shape and anisotropy of supraparticles can enhance their functionality, enabling applications in fields such as optics, magnetics, and medicine. The evaporation of self-lubricating colloidal ouzo droplets is an easy and efficient strategy to create supraparticles, overcoming the problem of the “coffee-stain effect” during drop evaporation. Yet, the parameters that control the shape of the supraparticles formed in such evaporating droplets are not fully understood. Here, we show that the size of the colloidal particles determines the shape of the supraparticle. We compared the shape of the supraparticles made of seven different sizes of spherical silica particles, namely from 20 to 1000 nm, and of the mixtures of small and large colloidal particles at different mixing ratios. Specifically, our in situ measurements revealed that the supraparticle formation proceeds via the formation of a flexible shell of colloidal particles at the rapidly moving interfaces of the evaporating droplet. The time t c0 when the shell ceases to shrink and loses its flexibility is closely related to the size of particles. A lower t c0 , as observed for smaller colloidal particles, leads to a flat pancake-like supraparticle, in contrast to a more curved American football-like supraparticle from larger colloidal particles. Furthermore, using a mixture of large and small colloidal particles, we obtained supraparticles that display a spatial variation in particle distribution, with small colloids forming the outer surface of the supraparticle. Our findings provide a guideline for controlling the supraparticle shape and the spatial distribution of the colloidal particles in supraparticles by simply self-lubricating ternary drops filled with colloidal particles.

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confidence: 89%

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confidence: 99%

Particle Size Determines the Shape of Supraparticles in Self-Lubricating Ternary Droplets

et al. 2021

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“…The random-stated and assembly SMNs can be formed into ordered chain-like 1D structures and then evolve into the multichains and the long-range 2D planar/sheet structures (Liu J. et al, 2019). Further increasing the SMNs concentration and the interparticle potential may lead to coalescence of the 2D planar structures and eventually assemble to 3D crystals (Wang and Yin, 2016).…”

Section: Basic Principles Of Mrpcsmentioning

confidence: 99%

“…He's group developed, tailored, and assembled ellipsoidal particles into PC supraparticles (PCSs) with unusual non-closepacked structures with a spatially confined magnetic assembly strategy (Liu J. et al, 2019) which exhibits anisotropic optical properties and multiple magneto-optical responses. Based on the above-mentioned, the periodic structure of PCs is not confined to the spheres, and the formation of PCs by non-spherical magnetic material under the MF also further have validated the regulation of MNPs by the MF.…”

Section: The Formation Of An Ordered Structure Of Mrpcs Under Emfmentioning

confidence: 99%

Progress on Rapidly and Self-Assembly Magnetically Responsive Photonic Crystals With High Tunability and Stability

et al. 2022

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Magnetically induced self-assembling is considered a novel method to form photonic crystals (PCs) by the directive arrangement of nanoparticles (NPs) under a magnetic field. Magnetically responsive PCs (MRPCs) have become one of the most promising materials due to their adjustable bandgap along with the field intensity and direction, and rapid and reversible response. In this paper, we review the basic principles of MRPCs, the research progress of magnetically induced self-assembling PCs including synthesis and modification of magnetically induced NPs, the formation of an ordered structure of MRPCs, the non-spherical materials self-assemble into PC structure, and the non-magnetic materials self-assembling into PC structure. And then we also summarize the regulatory factors of the physical and chemical responses under magnetic field, and give an outlook as to the applications of MRPCs.

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“…Very recently, we also demonstrated magnetic tuning of multiple optical properties in CCA of magnetic nanodiscs and in supraparticles of magnetic ellipsoids. 21,22 It would be of considerable interest to extend this tuning of multiple optical properties in the same material to stimuli other than magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Shear-induced alignment of low-aspect-ratio nanorods for modulations of multiple optical properties

Chen

Hai

et al. 2022

J. Mater. Chem. C

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Rugby-ball-like photonic crystal supraparticles with non-close-packed structures and multiple magneto-optical responses

Abstract: Nanoellipsoid-based photonic crystal supraparticles with tailored shapes and unusual internal structures are developed.

Cited by 18 publications

References 61 publications

Particle Size Determines the Shape of Supraparticles in Self-Lubricating Ternary Droplets

Particle Size Determines the Shape of Supraparticles in Self-Lubricating Ternary Droplets

Progress on Rapidly and Self-Assembly Magnetically Responsive Photonic Crystals With High Tunability and Stability

Shear-induced alignment of low-aspect-ratio nanorods for modulations of multiple optical properties

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