Bird's nest inspired aerogels towards ultrahigh strength and robust flame retardancy at extreme environment

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2024-11-12 DOI:10.1016/j.compositesb.2024.111966

Hong Zhang , Haiyun Ma , Huiqi Gao , Le Yang , Chang Wang , Yunhong Jiao , Jianzhong Xu

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引用次数: 0

Abstract

The mechanical properties of aerogels remain a critical concern for their application. Inspired from the hierarchical architecture of bird's nests, we have designed an effective biomimetic hybrid strategy for creating an aerogel with ultrahigh strength and robust flame retardancy. The super-molecular micro-to nanofibrils formed by boric acid and melamine act as “twigs” while a small part of biobased polysaccharide agar serves as “glue”. Via the water as the solvent and an eco-friendly freeze-drying method, the obtained boric acid-melamine/agar (BMA) aerogel with a low density (0.0760 g/cm³) exhibited exceptional high compressive strength, reaching up to 3.92 MPa at 80 % strain. A piece of the BMA aerogel with 10 cm² can resist a motorcycle (150 kg) easily without any deformation. Additionally, the BMA aerogel demonstrated outstanding inherent flame retardant property (achieving UL-94 V-0 rating with relatively low the heat release, total heat release and CO release rate values) as well as superior thermal insulating properties (with a thermal conductivity as low as 0.0364 W/m⋅K). Given the distinctive mechanical properties and excellent other properties, the BMA aerogels hold great promise for potential promise in energy-saving and thermal protection applications. and the superior stiffness mechanism behind this performance is also analyzed.

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受鸟巢启发的气凝胶可在极端环境下实现超高强度和强阻燃性能

气凝胶的机械性能仍然是其应用的关键问题。受鸟巢分层结构的启发，我们设计了一种有效的生物仿生混合策略，用于制造具有超高强度和强阻燃性能的气凝胶。由硼酸和三聚氰胺形成的超分子微纳米纤维充当 "树枝"，而一小部分生物基多糖琼脂则充当 "胶水"。以水为溶剂，采用环保的冷冻干燥方法，得到的硼酸-三聚氰胺-琼脂（BMA）气凝胶密度低（0.0760 g/cm3），抗压强度极高，80%应变时可达3.92兆帕。一块 10 平方厘米的 BMA 气凝胶可以轻松抵挡一辆重达 150 千克的摩托车而不发生任何变形。此外，BMA 气凝胶还具有出色的固有阻燃性能（达到 UL-94 V-0 级，热释放量、总热释放量和 CO 释放率值相对较低）和卓越的隔热性能（导热系数低至 0.0364 W/m⋅K）。由于 BMA 气凝胶具有独特的机械性能和优异的其他性能，因此在节能和热保护应用中大有可为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.