Solute effects on the dynamics and deformation of emulsion droplets during freezing

Tyagi, Sidhanth; Monteux, Cécile; Deville, Sylvain

doi:10.1039/d2sm00226d

Cited by 9 publications

(12 citation statements)

References 51 publications

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“…For example, room temperature thawing or the ice-dissolving-complexation process was developed to replace the freeze-drying process to obtain ice-templated materials. Besides, many works have been focusing on the movement and assembly of the colloidal particles during freezing and aiming to offer guidance for the ice-templating process. , A combination of water freezing and 3D printing has been also reported, providing much more possibilities of constructing various architectures in the ice-templated materials. , Therefore, with a more comprehensive and in-depth understanding of the freezing mechanism and integration with other techniques, ice templating will be more widely applied for the fabrication of novel materials with excellent performances.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

Ice-Templated Fabrication of Porous Materials with Bioinspired Architecture and Functionality

Dai

Gao

et al. 2022

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Biological porous materials, such as polar bear hair, wood, bamboo, and cuttlebone, exhibit outstanding thermal and mechanical properties due to their hierarchical architectures. Specifically, polar bears can retain thermal homeostasis in the extremely cold Arctic due to outstanding thermal insulation property of their porous hairs; wood and bamboo exhibit excellent mechanical strength, highly efficient water and nutrient transport capacity, and low density due to their hierarchically aligned porous architecture; cuttlebone can resist large hydrostatic pressure in the deep-sea environment due to its mechanically efficient porous structure with lamellar septa connected by asymmetrically S-shaped walls. Obviously, the hierarchical architecture is crucial for the excellent performance of biological porous materials. Inspired by these natural design motifs, bioinspired materials with hierarchical architectures have been extensively explored for various applications where excellent mechanical, thermal, and electric properties are highly demanded. As a controllable, versatile, scalable, and environmentalfriendly process, ice templating (or freeze casting) represents an effective approach to mimicking the sophisticated architecture of biological materials in synthetic counterparts, which has attracted wide attention from research groups across the world.In recent years, we have conducted comprehensive studies on the mechanism of the ice-templating approach and provided a rich toolbox based on this technique to meet various manufacturing demands. We systematically studied the material assembly process and the heat and mass transfer mechanism of the ice-templating technology from the aspects of cold surface, temperature field design, and intrinsic properties of the building blocks. First, bidirectional freezing guided by dual temperature gradients was developed to generate a long-range nacre−mimetic lamellar architecture. Next, complex hierarchical lamellar architectures were constructed through freezing on engineered cold surfaces with either wettability gradient or grooved pattern. Additionally, the "freeze-spinning" technique was developed to realize continuous and large-scale fabrication of fibers with aligned porous architecture mimicking polar bear hair. Finally, the applicability of the unidirectional ice-templating technique was broadened from soluble to insoluble polymeric materials through the freezing of emulsion droplets. These techniques have been widely used to fabricate a series of porous materials with bioinspired architectures, which hold great potential in thermal regulation, liquid transport, and mechanical functions for wide applications in various fields. Finally, a concise summary of this Account, including latest development, future challenges and opportunities in the ice-templated fabrication of bioinspired porous materials will be provided. This Account provides guidance for the design and ice-templated fabrication of bioinspired porous materials w...

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Section: Conclusion and Perspectivementioning

confidence: 99%

Ice-Templated Fabrication of Porous Materials with Bioinspired Architecture and Functionality

Dai

Gao

et al. 2022

Acc. Mater. Res.

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“…To nevertheless still qualitatively address the rate at which freezing occurred, we couple the rate of engulfment V to the experienced drop deformation Γ once incorporated into the ice, as it has been established that both are inversely related. 19,20 Here, a large deformation (larger Γ ) is related to slower freezing (smaller V ) and vice versa , where for the range of advancing velocities is approximately 0.2 μm s −1 ≲ V ≲ 2 μm s −1 . In Fig.…”

Section: Resultsmentioning

confidence: 96%

“…17 Furthermore, recent investigations involving “soft” particles, such as droplets or bubbles, have shown that the overall complexity is further amplified due to the mechanical deformation experienced by the particles during the interaction with the moving solidification front. 18–20…”

Section: Introductionmentioning

confidence: 99%

Freezing-induced topological transition of double-emulsion

Meijer,

Kant,

Lohse

2024

Soft Matter

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“…We recently focused on two related aspects of these problems: Understanding the physics of ice interacting with soft objects and the various components added to the initial mixture (solutes, surfactants, cryoprotectants, etc.). Cryo-confocal microscopy is particularly appropriate for such studies, revealing self-assembled objects in a temperature gradient, the key role of the solute, and the importance of the relative thermal conductivity of the particles and the melt . These studies contribute to a better understanding of the formation of the microstructure and the parameters that control it. The behavior of soft objects at the freezing front.…”

Section: Current Trends and Possible Futuresmentioning

confidence: 99%

Complex Composites Built through Freezing

2022

Self Cite

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Conspectus Using a limited selection of ordinary components and at ambient temperature, nature has managed to produce a wide range of incredibly diverse materials with astonishingly elegant and complex architectures. Probably the most famous example is nacre, or mother-of-pearl, the inner lining of the shells of abalone and certain other mollusks. Nacre is 95% aragonite, a hard but brittle calcium carbonate mineral, that exhibits fracture toughness exceedingly greater than that of pure aragonite, when tested in the direction perpendicular to the platelets. No human-made composite outperforms its constituent materials by such a wide margin. Nature’s unique ability to combine the desirable properties of components into a material that performs significantly better than the sum of its parts has sparked strong interest in bioinspired materials design. Inspired by this complex hierarchical architecture, many processing routes have been proposed to replicate one or several of these features. New processing techniques point to a number of laboratory successes that hold promise in mimicking nacre. We pioneered one of them, ice templating, in 2006. When a suspension of particles is frozen, particles are rejected by the growing ice crystals and concentrate in the space between the crystals. After the ice is freeze-dried, the resulting scaffold is a porous body that can eventually be pressed to increase the density and then be infiltrated with a second phase, providing multilayered, lamellar complex composites with a microstructure reminiscent of nacre. The composites exhibit a marked crack deflection during crack propagation, enhancing the damage resistance of the materials, offering an interesting trade-off of strength and toughness. Freezing as a path to build complex composites has turned out to be a rich line of research and development. Understanding and controlling the freezing routes and associated phenomena has become a multidisciplinary endeavor. A step forward in the complexity was achieved with the use of anisotropic particles. Ice-induced segregation and alignment of platelets can yield dense, inorganic composites (nacre-like alumina) with a complex architecture and microstructure, replicating several of the morphological features of nacre. Now, a different class of complex composites is quickly arising: engineered living materials, developed in the soft matter and biology communities. The material-agnostic nature of the freezing routes, the use of an aqueous system, the absence of organic solvents, and the low temperatures being used are all strong assets for the development of such complex composites. More complex building blocks, such as cells or bacteria, can be frozen. Understanding the fundamental mechanisms controlling the interactions between the ice crystals and the objects as well as the interactions between the soft objects themselves and their fate is essential in this context. In this Account, we highlight our efforts over the past decade to achieve the controlled synthesis of nacre-like composites...

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Solute effects on the dynamics and deformation of emulsion droplets during freezing

Abstract: Soft or rigid particles, suspended in a liquid melt, interact with an advancing solidification front in various industrial and natural processes, such as fabrication of particle-reinforced-composites, growth of crystals, cryopreservation,...

Cited by 9 publications

References 51 publications

Ice-Templated Fabrication of Porous Materials with Bioinspired Architecture and Functionality

Ice-Templated Fabrication of Porous Materials with Bioinspired Architecture and Functionality

Freezing-induced topological transition of double-emulsion

Complex Composites Built through Freezing

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