Formation of Supraparticles and Their Application in Catalysis

Hou, Ke; Han, Jianyu; Tang, Zhiyong

doi:10.1021/acsmaterialslett.9b00446

Cited by 52 publications

(58 citation statements)

References 128 publications

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“…As a result of the assembly, the supraparticles gain additional functionality as compared to the colloidal building blocks they are made of. 1 , 2 In symmetric assemblies, the additional functionality is obtained by a collective response of the colloids, for instance, in optoelectronics, optics, and photonics, 3 − 7 catalysis, 8 and drug delivery. 9 Tuning the shape and introducing asymmetry and anisotropy in supraparticles can be important in applications where directionality is crucial.…”

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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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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: 99%

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

et al. 2021

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“…outlined different methods to create SPs for various catalytic fields. [ 153 ] This is why in the following, we only outline a few examples of systems that are of particular importance in light of sustainability.…”

Section: Supraparticles For Sustainabilitymentioning

confidence: 99%

Supraparticles for Sustainability

Wintzheimer

Reichstein

Groppe

et al. 2021

Adv Funct Materials

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The indispensable transformation to a (more) sustainable human society on this planet heavily relies on innovative technologies and advanced materials. The merits of nanoparticles (NPs) in this context are demonstrated widely during the last decades. Yet, it is believed that the impact of particle‐based nanomaterials to sustainability can be even further enhanced: taking NPs as building blocks enables the creation of more complex entities, so‐called supraparticles (SPs). Due to their evolving phenomena coupling, emergence, and colocalization, SPs enable completely new material functionalities. These new functionalities in SPs can be utilized to render six fields, essential to human life as it is conceived, more sustainable. These fields, selected based on an entropy‐rate‐related definition of sustainability, are as follows: 1) purification technologies and 2) agricultural delivery systems secure humans “fundamental needs.” 3) Energy storage and conversion, as well as 4) catalysis enable the “basic comfort.” 5) Extending materials lifetime and 6) bringing materials back in use ensure sustaining “modern life comfort.” In this review article, a perspective is provided on why and how the properties of SPs, and not simply properties of individual NPs or conventional bulk materials, may grant attractive alternative pathways in these fields.

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“…93 Moreover, SPs usually offer high contact areas for the interaction with the selected substrates as well as collective excitation and extensive multimodal plasmonic coupling, effects that are further translated into strongly enhanced catalytic activity with respect to single NPs. 40,94,95 A pioneer example is offered by the work of Li et al that developed single and multi-component chiral SPs showing enantioselective photocatalysis of Tyrosine (Tyr; Figure 7). 42 SPs were formed from assembly of penicillin (Pen) stabilized ZnNPs, with and without the addition of AuNPs.…”

Section: Catalytic Systemsmentioning

confidence: 99%