Stiff, porous scaffolds from magnetized alumina particles aligned by magnetic freeze casting

Frank, M.; Naleway, Steven E.; Haroush, Tsuk; Liu, Chin‐Hung; Siu, Sze Hei; Ng, Jerry; Torres, Ivan; Ismail, A. I. M.; Karandikar, Keyur; Porter, Michael M.; Graeve, Olivia A.; McKittrick, Joanna

doi:10.1016/j.msec.2017.03.246

Cited by 48 publications

(47 citation statements)

References 79 publications

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“…Microstructural alignment in freeze casting can be controlled through extrinsic methods, such as external fields, to improve compressive mechanical properties in the direction of alignment. This has been shown in magnetically aligned scaffolds studied by Porter et al Magnetic alignment has also been used to create two directions of lamellar alignment as seen in trabecular bone . In addition to synthesizing bioinspired bone and nacre (Figure g,h), freeze casting has been used to create a bioinspired narwhal tusk (Figure i) that showed enhanced torsional resistance due to the helical reinforcement .…”

Section: Bioinspired Designs At Different Length‐scalesmentioning

confidence: 84%

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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Section: Bioinspired Designs At Different Length‐scalesmentioning

confidence: 84%

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

et al. 2019

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“…These islands kept growing until their boundaries merged and became a layer of Ni. [33,36,37] LBL process and vacuum filtration often produce free-standing films. Detailed process is provided in the experimental section.…”

Section: Resultsmentioning

confidence: 99%

Bioinspired Nacre‐Like Ceramic with Nickel Inclusions Fabricated by Electroless Plating and Spark Plasma Sintering

Xü

Huang²,

Zhang

et al. 2018

Adv Eng Mater

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Hybrid composites of layered brittle-ductile constituents assembled in a brick-and-mortar architecture are promising for applications requiring high strength and toughness. Mostly, polymer mortars have been considered as the ductile layer in brick-and-mortar composites. However, low stiffness of polymers does not efficiently transfer the shear between hard ceramic bricks. Theoretical models point to metals as a more efficient mortar layer. However, infiltration of metals into ceramic scaffold is non-trivial, given the low wetting between metals and ceramics. The authors report on an alternative approach to fabricate brick-and-mortar ceramic-metal composites by using electroless plating of nickel (Ni) on alumina micro-platelets, in which Ni-coated microplatelets are subsequently aligned by a magnetic field, taking advantage of ferromagnetic properties of Ni. The assembled Ni-coated ceramic scaffold is then sintered using spark plasma sintering (SPS) to locally create Ni mortar layers between ceramic platelets, as well as to sinter the ceramic microplatelets. The authors report on materials and mechanical properties of the fabricated composite. The results show that this approach is promising toward development of bioinspired ceramic-metal composites.Many structural materials are quickly approaching their performance limits. [1] There is an unmet demand for damage-tolerant, lightweight bulk structural composites for a range of applications including transportation, infrastructure, and for applications requiring operation in extreme environments, such as high temperature and high pressure. Damage tolerance refers to the ability of a material to exhibit simultaneous strength and toughness to resist propagation of cracks.

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“…The formation of crystals can be controlled to manipulate the resulting microstructure. For example, freeze casting is a physical process wherein an aqueous slurry of micro or nanoscale particulates and a freezing agent such as water can be used to fabricate porous structures 395–397. As the water crystallizes, the nanoparticles are pushed by the solidification front, forming regions of concentrated solute.…”

Section: Thermal Patterningmentioning

confidence: 99%

Nanomaterial Patterning in 3D Printing

et al. 2020

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The synergistic integration of nanomaterials with 3D printing technologies can enable the creation of architecture and devices with an unprecedented level of functional integration. In particular, a multiscale 3D printing approach can seamlessly interweave nanomaterials with diverse classes of materials to impart, program, or modulate a wide range of functional properties in an otherwise passive 3D printed object. However, achieving such multiscale integration is challenging as it requires the ability to pattern, organize, or assemble nanomaterials in a 3D printing process. This review highlights the latest advances in the integration of nanomaterials with 3D printing, achieved by leveraging mechanical, electrical, magnetic, optical, or thermal phenomena. Ultimately, it is envisioned that such approaches can enable the creation of multifunctional constructs and devices that cannot be fabricated with conventional manufacturing approaches.

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Stiff, porous scaffolds from magnetized alumina particles aligned by magnetic freeze casting

Cited by 48 publications

References 79 publications

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

Bioinspired Nacre‐Like Ceramic with Nickel Inclusions Fabricated by Electroless Plating and Spark Plasma Sintering

Nanomaterial Patterning in 3D Printing

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