Mechanics of colloidal supraparticles under compression

Wang, Junwei; Schwenger, Jan; Ströbel, Andreas; Feldner, Patrick; Herre, Patrick; Romeis, Stefan; Peukert, Wolfgang; Merle, Benoit; Vogel, Nicolas

doi:10.1126/sciadv.abj0954

Cited by 29 publications

(35 citation statements)

References 86 publications

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“…We define the first pop-in (or jump in displacement) in the nominal stress–strain curve as the first fracture event, and the area under the curve up to fracture as the work of deformation. 61 …”

Section: Resultsmentioning

confidence: 99%

“…To this purpose, multiple indentations were performed into the tape after each particle measurement in order to remove the debris sticking to the tip. 61 …”

Section: Methodsmentioning

confidence: 99%

“…Intuitively, it would be anticipated that such a material easily breaks upon compression due to the relatively weak interparticle contacts. 61 However, supraparticles made from polystyrene primary particles exhibit a surprisingly high deformation resistance and ductile fracture behavior, which was comparable to solid polystyrene microparticles at ambient conditions. 61 Based on an adapted Griffith fracture model, we established scaling relationships connecting fracture stress and strain to the dimensions of primary particles and supraparticles.…”

Section: Introductionmentioning

confidence: 98%

“… 61 However, supraparticles made from polystyrene primary particles exhibit a surprisingly high deformation resistance and ductile fracture behavior, which was comparable to solid polystyrene microparticles at ambient conditions. 61 Based on an adapted Griffith fracture model, we established scaling relationships connecting fracture stress and strain to the dimensions of primary particles and supraparticles. In this context, the interplay between the physical interparticle bonds and the mechanical strength of the individual primary particles determines the complex fracture behavior of supraparticles.…”

Section: Introductionmentioning

confidence: 98%

“… 5 , 8 , 9 , 15 , 24 , 57 − 59 The precise control of the size and number of primary particles and, hence, the size and geometric feature of the supraparticles enables a detailed investigation of their size- and structure-dependent mechanical properties. 60 , 61 …”

Section: Introductionmentioning

confidence: 99%

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Influence of Surfactant-Mediated Interparticle Contacts on the Mechanical Stability of Supraparticles

et al. 2021

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Colloidal supraparticles are micron-scale spherical assemblies of uniform primary particles, which exhibit emergent properties of a colloidal crystal, yet exist as a dispersible powder. A prerequisite to utilize these emergent functionalities is that the supraparticles maintain their mechanical integrity upon the mechanical impacts that are likely to occur during processing. Understanding how the internal structure relates to the resultant mechanical properties of a supraparticle is therefore of general interest. Here, we take the example of supraparticles templated from water/fluorinated oil emulsions in droplet-based microfluidics and explore the effect of surfactants on their mechanical properties. Stable emulsions can be generated by nonionic block copolymers consisting of a hydrophilic and fluorophilic block and anionic fluorosurfactants widely available under the brand name Krytox. The supraparticles formed in the presence of both types of surfactants appear structurally similar, but differ greatly in their mechanical properties. While the nonionic surfactant induces superior mechanical stability and ductile fracture behavior, the anionic Krytox surfactant leads to weak supraparticles with brittle fracture. We complement this macroscopic picture with Brillouin light spectroscopy that is very sensitive to the interparticle contacts for subnanometer-thick adsorbed layers atop of the nanoparticle. While the anionic Krytox does not significantly affect the interparticle bonds, the amphiphilic nonionic surfactant drastically strengthens these bonds to the point that individual particle vibrations are not resolved in the experimental spectrum. Our results demonstrate that seemingly subtle changes in the physicochemical properties of supraparticles can drastically impact the resultant mechanical properties.

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Section: Resultsmentioning

confidence: 99%

“…To this purpose, multiple indentations were performed into the tape after each particle measurement in order to remove the debris sticking to the tip. 61 …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Surfactant-Mediated Interparticle Contacts on the Mechanical Stability of Supraparticles

et al. 2021

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Augmentation of Liquid Metal Particle Mechanics via Non‐Native Oxide Nanoshells

Kong,

Morris,

Farrell

et al. 2023

Adv Funct Materials

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Room‐temperature liquid metal particles based on gallium have become significantly important for developing next‐generation soft electronics. Eutectic gallium‐indium (EGaIn) alloys can be fabricated into core‐shell particles discretely encapsulated by a passivating oxide. Application of mechanical stimuli results in rupturing the molten core through the oxide shell, merging EGaIn particles to form conductive pathways. Generally, the mechanical properties of EGaIn are largely defined by the native oxide which imparts viscoelastic properties to the fluid. In this work, the practical implications of EGaIn deformation and fracture behavior with the native oxide and a non‐native inorganic silica shell are demonstrated. To augment the mechanical properties of EGaIn, silica nanoshells are introduced as a chemically inert coating to enable brittle fracture of particles. In situ single‐particle nanoindentation characterization reveals the environmental and geometrical considerations for particle deformation and fracture. Silica‐coated EGaIn particles reach stiffness values at least an order of magnitude higher than that of native EGaIn particles. The thickness of the silica shell can be tailored to further modify the mechanical behavior of EGaIn, enabling potential pressure‐sensitive conductivity. These results provide additional pathways to understand the design and implementation of functionalized EGaIn particles for future applications in mechanoresponsive electronics, plasmonics, and therapeutics.

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Multifunctional, Hybrid Materials Design via Spray‐Drying: Much more than Just Drying

Wintzheimer,

Luthardt,

Cao

et al. 2023

Advanced Materials

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Spray‐drying is a popular and well‐known “drying tool” for engineers. This perspective highlights that, beyond this application, spray‐drying is a very interesting and powerful tool for materials chemists to enable the design of multifunctional and hybrid materials. Upon spray‐drying, the confined space of a liquid droplet is narrowed down, and its ingredients are forced together upon “falling dry.” As detailed in this article, this enables the following material formation strategies either individually or even in combination: nanoparticles and/or molecules can be assembled; precipitation reactions as well as chemical syntheses can be performed; and templated materials can be designed. Beyond this, fragile moieties can be processed, or “precursor materials” be prepared. Post‐treatment of spray‐dried objects eventually enables the next level in the design of complex materials. Using spray‐drying to design (particulate) materials comes with many advantages—but also with many challenges—all of which are outlined here. It is believed that multifunctional, hybrid materials, made via spray‐drying, enable very unique property combinations that are particularly highly promising in myriad applications—of which catalysis, diagnostics, purification, storage, and information are highlighted.

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Mechanics of colloidal supraparticles under compression

Cited by 29 publications

References 86 publications

Influence of Surfactant-Mediated Interparticle Contacts on the Mechanical Stability of Supraparticles

Influence of Surfactant-Mediated Interparticle Contacts on the Mechanical Stability of Supraparticles

Augmentation of Liquid Metal Particle Mechanics via Non‐Native Oxide Nanoshells

Multifunctional, Hybrid Materials Design via Spray‐Drying: Much more than Just Drying

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