Ceramic Quasicrystals

陶瓷准晶

• 批准号: 1411014
• 负责人: Nicholas Kotov
• 金额: $ 34.22万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411014&HistoricalAwards=false
• 关键词: Ceramic; Quasicrystals

NON-TECHNICAL DESCRIPTION: Quasicrystals are made from building blocks of regular size and shape that can fill up the space but do not have a repeatable pattern. Macroscale quasicrystals have been known since ancient times to mathematicians and artists who made are mosaics with such patterns. Molecular quasicrystals are very rare. They are found only for limited number of alloys and some meteorites. This unusual structure (tiling) makes them promising candidates for exceptionally strong materials because the lack of periodicity prevents the propagation of cracks. Vast majority of load-bearing structures built today are from ceramic materials but ceramic quasicrystals are not known. This project is aimed at developing general methods for preparation of quasicrystalline ceramics from nanoparticles that can make it both simple and diverse. Such ceramics materials may be of value for national defense, automotive industry, aviation, and electronics. The project includes an integrated multifaceted training of students in the cutting edge materials engineering and computer simulation technologies. It also includes an integral Outreach and Education Program, centered on early science education and quasicrystalline tilings which unite scientific and aesthetic values.TECHNICAL DETAILS: The key to the preparation of ceramic and composite quasicrystals will be self-organization of ceramic nanoparticles into quasicrystalline phases. This approach will allow the manufacturers to avoid extremely high temperatures and pressures. The nanoparticles selected for the project are spherical SiO2 modified with a polymer. Such nanoparticles feature two competing long-range interactions that inhibit crystallization in traditional phases in favor of quasicrystals. The synergy of experiment (Kotov) and simulations (Glotzer) make it possible to experimentally realize bulk ceramic quasicrystals from SiO2 under mild conditions. Quasicrystal phases simulated initially on the computer are assembled in aqueous dispersions. Following the three-dimensional crystallization into aperiodic structures, the initially soft materials are annealed to make robust bulk monoliths interconnected by strong covalent bonds. The composite quasicrystals are being made by monomer infiltration or layer-by-layer assembly. Different quasicrystalline ceramics are being comparatively investigated for mechanical properties and crack propagation mechanisms. They are expected to reveal set of properties previously unseen for any other materials. The combination of toughness, transparency and simplicity of preparation may lead to transformative changes in ceramics and their applications.

非技术描述：准晶体由规则尺寸和形状的构建块制成，可以填充空间，但不具有可重复的图案。 自古以来，数学家和艺术家就知道宏观准晶体，他们用这种图案制作马赛克。 分子准晶体非常罕见。 它们仅在有限数量的合金和一些陨石中被发现。 这种不寻常的结构（平铺）使它们成为非常坚固的材料的有希望的候选者，因为缺乏周期性可以防止裂纹的扩展。 当今建造的绝大多数承重结构都是由陶瓷材料制成的，但陶瓷准晶体尚不清楚。 该项目旨在开发从纳米颗粒制备准晶陶瓷的通用方法，使其既简单又多样化。这种陶瓷材料可能对国防、汽车工业、航空和电子等具有价值。 该项目包括对学生进行尖端材料工程和计算机模拟技术方面的综合多方面培训。 它还包括一个完整的外展和教育计划，以早期科学教育和结合科学和美学价值的准晶瓷砖为中心。技术细节：制备陶瓷和复合准晶的关键是陶瓷纳米颗粒自组织成准晶相。 这种方法将使制造商能够避免极高的温度和压力。 该项目选择的纳米颗粒是用聚合物改性的球形二氧化硅。这种纳米颗粒具有两种相互竞争的长程相互作用，抑制传统相中的结晶，有利于准晶体。实验 (Kotov) 和模拟 (Glotzer) 的协同作用使得在温和条件下通过实验实现 SiO2 陶瓷准晶成为可能。 最初在计算机上模拟的准晶相在水分散体中组装。 在三维结晶成非周期结构之后，最初的软材料被退火，形成通过强共价键互连的坚固的块体整体。复合准晶是通过单体渗透或逐层组装制成的。人们正在对不同准晶陶瓷的机械性能和裂纹扩展机制进行比较研究。预计它们将揭示一系列其他材料以前未曾见过的特性。 韧性、透明度和制备简单性的结合可能会给陶瓷及其应用带来革命性的变化。

项目成果

Site-selective proteolytic cleavage of plant viruses by photoactive chiral nanoparticles

• DOI: 10.1038/s41929-022-00823-1
• 发表时间: 2022-08-01
• 期刊: NATURE CATALYSIS
• 影响因子: 37.8
• 作者: Gao, Rui;Xu, Liguang;Kuang, Hua
• 通讯作者: Kuang, Hua

Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles

• DOI: 10.1038/s41565-022-01079-3
• 发表时间: 2022-03-14
• 期刊: NATURE NANOTECHNOLOGY
• 影响因子: 38.3
• 作者: Cai, Jiarong;Zhang, Wei;Kuang, Hua
• 通讯作者: Kuang, Hua

Enantiomer-dependent immunological response to chiral nanoparticles

• DOI: 10.1038/s41586-021-04243-2
• 发表时间: 2022-01-20
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Xu, Liguang;Wang, Xiuxiu;Xu, Chuanlai
• 通讯作者: Xu, Chuanlai

Chiral nanomaterials: evolving rapidly from concepts to applications

• DOI: 10.1039/d2ma90034c
• 发表时间: 2022-04-20
• 期刊: MATERIALS ADVANCES
• 影响因子: 5
• 作者: Kotov, Nicholas A.;Liz-Marzan, Luis M.;Wang, Qiangbin
• 通讯作者: Wang, Qiangbin

Chiral assemblies of pinwheel superlattices on substrates

• DOI: 10.1038/s41586-022-05384-8
• 发表时间: 2022-06
• 期刊: Nature
• 影响因子: 64.8
• 作者: Shan Zhou;Jiahui Li;Jun Lu;Haihua Liu;Jiyoung Kim;A. Kim;Lehan Yao;Chang Liu;Chang Qian-Chang-Qi