定制的纳米约束使珍珠仿生石墨烯/硅酸盐复合材料具有超高强度和韧性

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-04-23 DOI:10.1016/j.carbon.2025.120364

Kunkun Song , Junhong Liu , Jiaqi Dong , Yusheng Liang , Tao Du , Hengzhong Fan , Qiangqiang Zhang

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引用次数: 0

摘要

生物组织优越的强度和韧性为先进结构材料的合成提供了重要的动力，而精确地再现生物材料的层次化微观结构仍然是一个巨大的挑战。在这项研究中，我们通过真空辅助灌注和冷压处理合理计算还原氧化石墨烯（rGO）骨架结构，并将两种脆性化合物（石墨烯和硅酸钙）精确结合，开发了一种纳米级增韧陶瓷复合材料。硅酸钙被限制在相互连接的还原氧化石墨烯薄片中，形成层叠互穿的微观结构，其抗折强度和断裂能比传统硅酸钙高5倍以上。仿生石墨烯/硅酸钙复合材料（GCSC）的抗弯强度（26.39 MPa）、断裂能（121.0 N/m）、断裂韧性（1.5 MPa m1/2）和杨氏模量（40 GPa）显著提高。通过多尺度模拟和纳米结构表征，GCSC优异的力学性能源于还原氧化石墨烯的协同增强和水合硅酸钙的禁闭诱导结晶。从内因（纳米微腔增强硅酸盐晶体）和外因（可控石墨烯骨架诱导裂纹偏转）两方面确定了GCSC的独特力学性能。珍珠层启发的GCSC为合成具有高强度和高韧性的陶瓷复合材料的仿生层流结构铺平了新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Tailorable nanoconfinement enables nacreous biomimetic graphene/silicate composites with ultrahigh strength and toughness

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Tailorable nanoconfinement enables nacreous biomimetic graphene/silicate composites with ultrahigh strength and toughness

The superior strength and toughness of biological tissues have provided significant motivation for synthesizing advanced structural materials, while precisely reproducing the hierarchical microstructures of biological materials remains a huge challenge. In this study, we developed a nacre-inspired toughening ceramic composite by precisely combining two brittle compounds (graphene and calcium silicate) after rationally calculating the reduced graphene oxide (rGO) backbone structure through vacuum-assisted perfusion followed by a cold pressing treatment. The calcium silicate was confined within interconnected rGO sheets, resulting in a laminate interpenetrated microstructure with flexural strength and fracture energy over 5 times higher than that of conventional calcium silicate. The biomimetic graphene/calcium silicate composite (GCSC) exhibited significantly improved flexural strength (26.39 MPa), fracture energy (121.0 N/m), fracture toughness (1.5 MPa m^1/2), and Young's modulus (40 GPa). Through multiscale simulations and nanostructure characterization, the exceptional mechanical properties of GCSC stemmed from the synergistic reinforcement of rGO and confinement-induced crystallization of calcium-silicate-hydrate. The unique mechanical properties of GCSC were identified from both intrinsic (nanoconfined microcavities enhanced silicate crystals) and extrinsic (controllable graphene backbone induced crack deflection) perspectives. The nacre inspired GCSC has paved a new pathway to synthesize biomimetic laminar structure of ceramic composites that possesses high strength and toughness concurrently.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.