High-strength and multifunctional honeycomb polyimide aerogel fabricated by a freeze casting-assisted extrusion printing and building block-assembly strategy for sound absorbing metamaterials

Gui, Yan; Fei, Zhifang; Zhao, Shuang; Zhang, Zhen; Shao, Huilong; Chen, Jun; Li, Kunfeng; Du, Hu; Yang, Zichun

doi:10.1016/j.addma.2023.103799

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…When the diameter of the perforation was increased from 1 to 3 mm, the pressure diffusion effect was more obvious, and the acoustic performance was improved ( Figure 10 e). Constructing a resonant cavity structure is another way to improve the low-frequency sound absorption performance [ 125 , 126 ]. Zong et al [ 127 ] developed a cascaded resonant cavity structure flexible ceramic nanofibrous aerogel (FCNAs) using bubble-assisted freeze-casting technology ( Figure 10 f,g).…”

Section: Application Of Fibrous Three-dimensional Porous Materials In...mentioning

confidence: 99%

Preparation of Fibrous Three-Dimensional Porous Materials and Their Research Progress in the Field of Stealth Protection

Zhang,

Zhao,

Chen

et al. 2024

Nanomaterials

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Intelligent and diversified development of modern detection technology greatly affects the battlefield survivability of military targets, especially infrared, acoustic wave, and radar detection expose targets by capturing their unavoidable infrared radiation, acoustic wave, and electromagnetic wave information, greatly affecting their battlefield survival and penetration capabilities. Therefore, there is an urgent need to develop stealth-protective materials that can suppress infrared radiation, reduce acoustic characteristics, and weaken electromagnetic signals. Fibrous three-dimensional porous materials, with their high porosity, excellent structural adjustability, and superior mechanical properties, possess strong potential for development in the field of stealth protection. This article introduced and reviewed the characteristics and development process of fibrous three-dimensional porous materials at both the micrometer and nanometer scales. Then, the process and characteristics of preparing fibrous three-dimensional porous materials through vacuum forming, gel solidification, freeze-casting, and impregnation stacking methods were analyzed and discussed. Meanwhile, their current application status in infrared, acoustic wave, and radar stealth fields was summarized and their existing problems and development trends in these areas from the perspectives of preparation processes and applicability were analyzed. Finally, several prospects for the current challenges faced by fibrous three-dimensional porous materials were proposed as follows: functionally modifying fibers to enhance their applicability through self-cross-linking; establishing theoretical models for the transmission of thermal energy, acoustic waves, and electromagnetic waves within fibrous porous materials; constructing fibrous porous materials resistant to impact, shear, and fracture to meet the needs of practical applications; developing multifunctional stealth fibrous porous materials to confer full-spectrum broadband stealth capability; and exploring the relationship between material size and mechanical properties as a basis for preparing large-scale samples that meet the application’s requirement. This review is very timely and aims to focus researchers’ attention on the importance and research progress of fibrous porous materials in the field of stealth protection, so as to solve the problems and challenges of fibrous porous materials in the field of stealth protection and to promote the further innovation of fibrous porous materials in terms of structure and function.

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Section: Application Of Fibrous Three-dimensional Porous Materials In...mentioning

confidence: 99%

Preparation of Fibrous Three-Dimensional Porous Materials and Their Research Progress in the Field of Stealth Protection

Zhang,

Zhao,

Chen

et al. 2024

Nanomaterials

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“…Although researchers have demonstrated the feasibility and rationality of organic polymers as a research system for high-strength aerogels [6], the increase in strength of these aerogels relies too much on density increase. The density is positively correlated with the thermal conductivity of the solid phase, making it difficult to simultaneously optimize the insulation performance and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Compressible polybenzoxazine high-strength aerogel with a linear structure for thermal insulation

Long,

Xue,

Qin

et al. 2024

J. Phys.: Conf. Ser.

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The vulnerable structures have been the biggest barrier to the progress and use of aerogels, making it impossible to use aerogels alone in practical environments. The reversible sacrificial hydrogen bonding system in polybenzoxazine can greatly affect the strength function, providing a new approach for designing high-strength aerogels. We achieve a long-chain structured benzoxazine monomer as a precursor and a polybenzoxazine aerogel with excellent mechanical performance. The aerogel achieves a high compression strength (18.8 MPa) and a high fracture strain (78.0 %) at a 0.252 g/cm3 density. Furthermore, the aerogel also exhibits a low room temperature heat conductivity coefficient (0.03343 W/(m·K)) and hydrophobicity (water contact angle of 142.7°), demonstrating its high potential for use in the fields of construction, industry, space flight aircraft, etc.

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High-strength and multifunctional honeycomb polyimide aerogel fabricated by a freeze casting-assisted extrusion printing and building block-assembly strategy for sound absorbing metamaterials

Cited by 2 publications

References 38 publications

Preparation of Fibrous Three-Dimensional Porous Materials and Their Research Progress in the Field of Stealth Protection

Preparation of Fibrous Three-Dimensional Porous Materials and Their Research Progress in the Field of Stealth Protection

Compressible polybenzoxazine high-strength aerogel with a linear structure for thermal insulation

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