Structure control of hydroxyapatite ceramics via an electric field assisted freeze casting method

Zhang, Cheng; Zhao, Kang; Wu, Zhengneng

doi:10.1016/j.ceramint.2015.03.069

Cited by 23 publications

(13 citation statements)

References 13 publications

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“…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 . Electric fields have also been used to increase pore size in hydroxyapatite scaffolds or increase scaffold wall thickness in alumina scaffolds . Electrophoretic deposition was found to create fine lamellar structure in scaffolds .…”

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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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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“…As mentioned earlier, achieving biomaterials whose morphology is inspired by bone's ultrastructure can be attempted using ice templating. Hap, 37,94,[103][104][105][106][107] one of the main components of bone, is consequently holding a dominant place in the fabrication of scaffolds for bone tissue engineering applications. Hap scaffolds were obtained through the use of electric field assisted ice templating.…”

Section: Scaffold Composition -How To Define the Composition Of Ice Templated Scaffolds For 3d Cell Culture?mentioning

confidence: 99%

“…Hap scaffolds were obtained through the use of electric field assisted ice templating. 104 Using H2O2 as pore-forming agent resulted in both lamellar and spherical pores in the scaffold. When the electric field intensity increased from 0 to 90 kV.m -1 , the average diameters of the lamellar and spherical pores increased from 460 to 810 μm and from 320 to 420 μm, respectively, due to the limited growth rate of ice crystals induced by the electric field.…”

Section: Scaffold Composition -How To Define the Composition Of Ice Templated Scaffolds For 3d Cell Culture?mentioning

confidence: 99%

Recent advances in ice templating: from biomimetic composites to cell culture scaffolds and tissue engineering

2021

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“…Increasing the electrical field strength increased the thickness of the dense layer. In related work [72], a strong electric field was applied parallel to the solidification direction of an H 2 O 2 solution. In these scaffolds, both lamellar and spherical pores were formed.…”

Section: Electric Fieldsmentioning

confidence: 99%

“…Lamellar pores were formed by the growing ice columns, while spherical pores were formed by the decomposition of H 2 O 2 into H 2 O and O 2. Increasing the field from 0 to 90 kV/m resulted in increased lamellar and spherical pore diameters [72].…”

Section: Electric Fieldsmentioning

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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Structure control of hydroxyapatite ceramics via an electric field assisted freeze casting method

Cited by 23 publications

References 13 publications

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

Recent advances in ice templating: from biomimetic composites to cell culture scaffolds and tissue engineering

External Field Assisted Freeze Casting

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