Nano-architected ceramic aerogels with an engineered seamless shell-based configuration

IF 4.2 2区 工程技术 Q1 MECHANICS
Kia Dastani , Mohammad R. Movahhedy , Saeed Khodaygan , Micheal Yu Wang , Hongyu Yu
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Abstract

Traditionally synthesized ceramic aerogels possess a random internal configuration, which leads to poor mechanical properties. One effective strategy to address this issue is through architected design. This research explores a bottom-up synthesis approach to fabricate ceramic aerogels with an engineered internal configuration. The architected design specifically means creating periodic cellular structures with defined unit-cells. In this work, nano-architected ceramic aerogels composed of a 50–200 nm Al2O3 film with a relative density of 1.5–6 % are fabricated. A seamless shell-based configuration is employed, diverging from previous works that utilized hollow-tube designs. Due to their slender nature, these nanostructured ceramics are prone to instability failure and are sensitive to manufacturing imperfections. The most critical imperfection in this fabrication process is the geometric deviation between the designed model and the final fabricated structure. This research studies the nature and extent of these geometric deviations and investigates their impact on mechanical performance. The results indicate that the strength of the nano-architected aerogels in this study is significantly higher than that of conventional aerogels and those with hollow-tube designs.

Abstract Image

纳米结构的陶瓷气凝胶,具有工程无缝的外壳结构
传统合成的陶瓷气凝胶具有随机的内部结构,导致其力学性能较差。解决这个问题的一个有效策略是通过架构设计。本研究探索了一种自下而上的合成方法来制造具有工程内部结构的陶瓷气凝胶。架构设计特别意味着创建具有定义的单元格的周期性细胞结构。在这项工作中,制备了由50-200 nm Al2O3薄膜组成的纳米陶瓷气凝胶,其相对密度为1.5 - 6%。与之前使用空心管设计的作品不同,采用了无缝外壳结构。由于其细长的性质,这些纳米结构陶瓷容易发生不稳定失效,并且对制造缺陷很敏感。在这种制造过程中最关键的缺陷是设计模型与最终制造结构之间的几何偏差。本研究研究了这些几何偏差的性质和程度,并调查了它们对机械性能的影响。结果表明,纳米结构气凝胶的强度明显高于常规气凝胶和空心管气凝胶。
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
CiteScore
7.00
自引率
7.30%
发文量
275
审稿时长
48 days
期刊介绍: The European Journal of Mechanics endash; A/Solids continues to publish articles in English in all areas of Solid Mechanics from the physical and mathematical basis to materials engineering, technological applications and methods of modern computational mechanics, both pure and applied research.
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