Defects and plasticity in ultrastrong supercrystalline nanocomposites

Giuntini, Diletta; Zhao, Shiteng; Krekeler, Tobias; Li, Mingjing; Blankenburg, Malte; Bor, Büsra; Schaan, Gunnar; Domènech, Berta; Müller, Martin; Scheider, Ingo; Ritter, Martin; Schneider, Gerold A.

doi:10.1126/sciadv.abb6063

Cited by 23 publications

(28 citation statements)

References 49 publications

(83 reference statements)

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“…For example, many defects in NP supercrystals and also their response to mechanical stress can be described with classical shear theory of crystalline materials. [ 137 ] On the other hand, it is probably just as instructive to consider the limitations of the atom‐NP analogy and to be aware of the differences between them. Most importantly, in contrast to atoms, NPs are not monodisperse and also never perfectly uniform.…”

Section: Self‐assembly Of Nanoparticlesmentioning

confidence: 99%

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

Schulz

Lokteva

Parak

et al. 2021

Part & Part Syst Charact

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several issues far from being resolved: for many systems long-range periodic order is not routinely achieved, reproducibility is often not optimal and truly emergent and new properties arising from the supercrystal formation could be demonstrated for just a few systems. [3][4][5][6][7] From the materials science perspective there is no established figure of merit or common set of parameters allowing to quantify "quality" of NP superlattices and supercrystals. In lieu of such standard procedures, terms as well-ordered, crystalline order, quasicrystalline, etc., are usually used in literature. However, there exist no commonly accepted definitions of what qualifies, e.g., as "well-ordered."In this review, we want to highlight some recent experimental developments and new approaches to study self-assembly of NPs or structure formation of NP supercrystals and their final structure. We focus on NP, the broad field of photonic materials prepared by self-assembly of larger colloidal particles is not covered herein. [8][9][10] The introduction of the basic concepts of NP self-assembly will be kept short and should be considered as an overview, for more background and details excellent comprehensive reviews are available. [2,11] We will then briefly address and discuss the expectations associated with self-assembled materials, especially the proposed emergence of new properties directly related to order. In the second part of the review, we will present recent innovative approaches for the investigation of self-assembly and self-assembled structures that go beyond the standard characterization. We focus mainly on structure and structure formation and less on properties, so most of the studies are based on scattering and electron microscopy. Figure 1 provides an overview roughly following this outline. Self-Assembly of NanoparticlesSelf-assembly is a broad term and occurs on all scales from atoms, ions, and molecules to galaxies, as pointed out by Whitesides and Grzybowski. [12] It can be defined as the autonomous organization of multiple discrete components into ordered structures, driven by energetics or entropy or both. [2,13] In nature, countless examples of highly complex and functional structures resulting from self-assembly can be found, Self-assembly of nanoparticles (NPs) has evolved into a powerful tool for the synthesis of superstructures with tailored properties. The quality, diversity, and complexity of synthesized structures are continuously improving and fascinating new collective properties are demonstrated. At the same time, the rapid development of electron microscopy and synchrotron sources for X-rays has enabled new exciting experimental approaches to study structure and structure formation in the context of NP self-assembly. In this review, some recent studies and what can be learned from them are highlighted and discussed. It is started with a general introduction covering important concepts, experimental approaches, commonly obtained structures, the ideas of artificial atoms, and emerging properties a...

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Section: Self‐assembly Of Nanoparticlesmentioning

confidence: 99%

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

Schulz

Lokteva

Parak

et al. 2021

Part & Part Syst Charact

View full text Add to dashboard Cite

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“…In order to solve this problem, microfluidic technology is introduced to assist the internal gelation process for preparing monodisperse ceramic microspheres. Moreover, the monodisperse ceramic microspheres could be used as a grinding medium to prepare nanocrystalline materials to improve the morphology of the ceramic materials 4,5 …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the monodisperse ceramic microspheres could be used as a grinding medium to prepare nanocrystalline materials to improve the morphology of the ceramic materials. 4,5 However, the microfluidic-assisted internal gelation process is often used to prepare small ceramic microspheres of 10-100 μm, 6,7 limiting the application. For example, in the high-temperature gas-cooled reactor, the requirement for UO 2 microspheres is 500 μm in size with good sphericity.…”

Section: Introductionmentioning

confidence: 99%

An improvement of microfluidic‐assisted internal gelation in the preparation of millimeter‐sized ceramic microspheres

Zhao

Song

et al. 2022

J Am Ceram Soc.

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The microspheres prepared by the microfluidic‐assisted internal gelation process are still challenging to reach the millimeter size due to the large gravity. The gravity would affect the sphericity and size uniformity of microspheres. The improved microfluidic‐assisted internal gelation process is designed and optimized to produce large‐sized monodisperse ceramic microspheres with good sphericity. The movement mechanism of millimeter‐sized sol droplets and gel microspheres in the microchannel is summarized and the state of the dispersed phase entering the measuring cylinder is controlled. The friction between the gel microspheres and the tubing wall is reduced as much as possible, and ZrO2 ceramic microspheres of 500 ± 5 μm with good sphericity are prepared with the broth at room temperature. The mechanism of sol droplets entering the oil surface is explored to demonstrate the superiority of the improved microfluidic‐assisted internal gelation process. The improved microfluidic‐assisted internal gelation process could be directly extended to preparing other millimeter‐sized monodisperse ceramic microspheres.

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“…Static and dynamic friction (42) between the particles may further change the resulting mechanical properties. At the assembly level, the force network of the interacting PPs determines the distribution of the external pressure, and the arrangement of particles may thus influence crack propagation or dislocation movement (43)(44)(45). All of these individual contributions are coupled dynamically to the structure of the SP during its mechanical response to external forces.…”

Section: Introductionmentioning

confidence: 99%

Mechanics of colloidal supraparticles under compression

et al. 2021

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Colloidal supraparticles are finite, spherical assemblies of many primary particles. To take advantage of their emergent functionalities, such supraparticles must retain their structural integrity. Here, we investigate their size-dependent mechanical properties via nanoindentation. We find that the deformation resistance inversely scales with the primary particle diameter, while the work of deformation is dependent on the supraparticle diameter. We adopt the Griffith theory to such particulate systems to provide a predictive scaling to relate the fracture stress to the geometry of supraparticles. The interplay between primary particle material and cohesive interparticle forces dictates the mechanical properties of supraparticles. We find that enhanced stability, associated with ductile fracture, can be achieved if supraparticles are engineered to dissipate more energy via deformation of primary particles than breaking of interparticle bonds. Our work provides a coherent framework to analyze, predict, and design the mechanical properties of colloidal supraparticles.

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Defects and plasticity in ultrastrong supercrystalline nanocomposites

Cited by 23 publications

References 49 publications

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

Recent Notable Approaches to Study Self‐Assembly of Nanoparticles with X‐Ray Scattering and Electron Microscopy

An improvement of microfluidic‐assisted internal gelation in the preparation of millimeter‐sized ceramic microspheres

Mechanics of colloidal supraparticles under compression

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