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Fabrication of bioinspired helical-structured SiO2 porous ceramics via magnetic freeze casting.

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Title: Fabrication of bioinspired helical-structured SiO2 porous ceramics via magnetic freeze casting.
Authors: Lin, Jiong-Zhao1 (AUTHOR), Zhang, Chuan-Zheng1 (AUTHOR), Shaga, Alateng1,2,3 (AUTHOR) altsg@jlju.edu.cn, Chen, Guan-Hong1 (AUTHOR), Han, Cheng-Hao2 (AUTHOR), Wang, Huan3 (AUTHOR), Galdamsambuu, Saran4 (AUTHOR), Zhang, Xue-Jian1 (AUTHOR) zxj_0620@163.com
Source: Ceramics International. May2026:Part A, Vol. 52 Issue 12, p19349-19359. 11p.
Subjects: Helical structure, Compressive strength, Oxide ceramics, Magnetic fields, Biomimetic materials, Mechanical behavior of materials, Freezing
Abstract: Traditional freeze-cast SiO 2 porous ceramics have monotonous pore structures and insufficient compressive strength, limiting engineering applications. This study proposes a rotating magnetic field-assisted freeze-casting strategy, using SiO 2 as matrix and Fe 3 O 4 as magnetic alignment agent, to controllably fabricate bioinspired helical-structured porous ceramics. Effects of magnetic field type, intensity (46, 85, 138 mT) and rotational speed (0.05–0.15 r/min) were investigated. The results show that SiO 2 porous ceramics show disordered structure and low compressive strength (10 ± 2 MPa) without magnetic field. Static/rotating magnetic fields optimize their structure and mechanical properties; compressive strength peaks at 30 ± 3 MPa at 85 mT and 0.1 r/min, with Young's modulus rising with field strength. The mechanism is dynamic balance between magnetic torque and viscous resistance torque. This study pioneers the structure, supporting porous ceramic design and compressive properties optimization. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Traditional freeze-cast SiO 2 porous ceramics have monotonous pore structures and insufficient compressive strength, limiting engineering applications. This study proposes a rotating magnetic field-assisted freeze-casting strategy, using SiO 2 as matrix and Fe 3 O 4 as magnetic alignment agent, to controllably fabricate bioinspired helical-structured porous ceramics. Effects of magnetic field type, intensity (46, 85, 138 mT) and rotational speed (0.05–0.15 r/min) were investigated. The results show that SiO 2 porous ceramics show disordered structure and low compressive strength (10 ± 2 MPa) without magnetic field. Static/rotating magnetic fields optimize their structure and mechanical properties; compressive strength peaks at 30 ± 3 MPa at 85 mT and 0.1 r/min, with Young's modulus rising with field strength. The mechanism is dynamic balance between magnetic torque and viscous resistance torque. This study pioneers the structure, supporting porous ceramic design and compressive properties optimization. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.03.032