Ultrasound freeze casting: Fabricating bioinspired porous scaffolds through combining freeze casting and ultrasound directed self-assembly

Ogden, Taylor A.; Prisbrey, M.; Nelson, Isaac; Raeymaekers, Bart; Naleway, Steven E.

doi:10.1016/j.matdes.2018.107561

Cited by 47 publications

(41 citation statements)

References 36 publications

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“…In addition to the engineering of freeze cast structures by controlled thermal gradients, external magnetic, [ 24 ] electric, [ 25 ] and acoustic [ 26 ] fields, as well as light irradiation [ 27 ] can serve to further control the chemical states of suspension media or solid particles in colloidal suspensions during or after solidification. Magnetic fields generated by permanent magnets arranged in a variety of spatial orientations can produce scaffolds with different microstructural patterns when used in the freeze casting of magnetic particles or other building blocks functionalized with magnetic nanoparticles.…”

Section: Principles Of Freeze Castingmentioning

confidence: 99%

“…[ 25c ] In contrast, applying electric fields parallel to the solidification direction, producing scaffolds with bilayered dense/porous regions. [ 25b ] By employing a standing ultrasonic wave field (Figure 4K), [ 26 ] whereby the acoustic radiation force creates a standing pressure wave, regions of high and low pressure can be imparted in freeze‐casting processes. As particles are driven to low pressure regions of the standing wave, the resulting scaffolds exhibit a distribution of alternating dense/porous rings (Figure 4L).…”

Section: Principles Of Freeze Castingmentioning

confidence: 99%

See 1 more Smart Citation

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

2020

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Freeze casting, also known as ice templating, is a particularly versatile technique that has been applied extensively for the fabrication of well‐controlled biomimetic porous materials based on ceramics, metals, polymers, biomacromolecules, and carbon nanomaterials, endowing them with novel properties and broadening their applicability. The principles of different directional freeze‐casting processes are described and the relationships between processing and structure are examined. Recent progress in freeze‐casting assisted assembly of low dimensional building blocks, including graphene and carbon nanotubes, into tailored micro‐ and macrostructures is then summarized. Emerging trends relating to novel materials as building blocks and novel freeze‐cast geometries—beads, fibers, films, complex macrostructures, and nacre‐mimetic composites—are presented. Thereafter, the means by which aligned porous structures and nacre mimetic materials obtainable through recently developed freeze‐casting techniques and low‐dimensional building blocks can facilitate material functionality across multiple fields of application, including energy storage and conversion, environmental remediation, thermal management, and smart materials, are discussed.

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Section: Principles Of Freeze Castingmentioning

confidence: 99%

Section: Principles Of Freeze Castingmentioning

confidence: 99%

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

2020

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“…Electrophoretic deposition was found to create fine lamellar structure in scaffolds . Finally, recent work has been done on ultrasound‐controlled freeze casting to create concentric ring structures with high and low porosity rings, opening up many avenues to control hierarchical features at the microscale.…”

Section: Bioinspired Designs At Different Length‐scalesmentioning

confidence: 99%

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

et al. 2019

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Biological materials found in Nature such as nacre and bone are well recognized as light-weight, strong, and tough structural materials. The remarkable toughness and damage tolerance of such biological materials are conferred through hierarchical assembly of their multiscale (i.e., atomicto macroscale) architectures and components. Herein, the toughening mechanisms of different organisms at multilength scales are identified and summarized: macromolecular deformation, chemical bond breakage, and biomineral crystal imperfections at the atomic scale; biopolymer fibril reconfiguration/deformation and biomineral nanoparticle/nanoplatelet/ nanorod translation, and crack reorientation at the nanoscale; crack deflection and twisting by characteristic features such as tubules and lamellae at the microscale; and structure and morphology optimization at the macroscale. In addition, the actual loading conditions of the natural organisms are different, leading to energy dissipation occurring at different time scales. These toughening mechanisms are further illustrated by comparing the experimental results with computational modeling. Modeling methods at different length and time scales are reviewed. Examples of biomimetic designs that realize the multiscale toughening mechanisms in engineering materials are introduced. Indeed, there is still plenty of room mimicking the strong and tough biological designs at the multilength and time scale in Nature.

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“…For comparison, Figure 3 shows electron micrographs of scaffolds formed by freezing ceramic colloidal particles under different external field conditions [82,86]. As seen, magnetic fields tend to decrease the pore size, due to the formation of smaller ice crystals, compared to a non-magnetized slurry.…”

Section: Constitutional Supercoolingmentioning

confidence: 99%

“…As a result, standing waves form in the medium with high and low pressure regions. This standing wave creates an acoustic radiation potential given by [82]:…”

Section: Acoustic Forcementioning

confidence: 99%

External Field Assisted Freeze Casting

Niksiar

Frank

et al. 2019

Ceramics

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Freeze casting under external fields (magnetic, electric, or acoustic) produces porous materials having local, regional, and global microstructural order in specific directions. In freeze casting, porosity is typically formed by the directional solidification of a liquid colloidal suspension. Adding external fields to the process allows for structured nucleation of ice and manipulation of particles during solidification. External control over the distribution of particles is governed by a competition of forces between constitutional supercooling and electromagnetism or acoustic radiation. Here, we review studies that apply external fields to create porous ceramics with different microstructural patterns, gradients, and anisotropic alignments. The resulting materials possess distinct gradient, core–shell, ring, helical, or long-range alignment and enhanced anisotropic mechanical properties.

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Ultrasound freeze casting: Fabricating bioinspired porous scaffolds through combining freeze casting and ultrasound directed self-assembly

Cited by 47 publications

References 36 publications

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

External Field Assisted Freeze Casting

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