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：准晶体由常规尺寸和形状的构件制成，可以填充空间但没有可重复的模式。 自古以来，宏观的准晶体就对制作的数学家和艺术家自称为具有这种模式的马赛克。 分子准晶体非常罕见。 它们仅适用于有限数量的合金和一些陨石。 这种不寻常的结构（平铺）使他们有望获得异常强大的材料，因为缺乏周期性阻止了裂纹的传播。 当今建造的绝大多数承载结构都是来自陶瓷材料，但陶瓷准晶体却不知道。 该项目旨在开发从纳米颗粒制备准晶陶瓷的一般方法，这些陶瓷可以使其变得简单而多样化。这种陶瓷材料可能对国防，汽车行业，航空和电子产品具有价值。 该项目包括对尖端材料工程和计算机仿真技术的学生进行集成的多面培训。 它还包括一项整体外展和教育计划，以早期科学教育和准晶体统一为中心，该计划将科学和美学价值团结起来。技术细节：准备陶瓷和复合准晶体的关键是将陶瓷纳米粒子自组织为Quasicrystalline阶段。 这种方法将使制造商避免高温和压力。 为该项目选择的纳米颗粒是用聚合物修饰的球形SIO2。这样的纳米颗粒具有两种竞争性的长期相互作用，这些相互作用抑制了传统阶段的结晶，而有利于准晶体。实验（KOTOV）和模拟（Glotzer）的协同作用使实验在轻度条件下实验实验中实现SIO2的大量陶瓷准晶体。 最初在计算机上模拟的准晶体相位在水性分散体中组装。 遵循三维结晶为上的结构，将最初的软材料退火，以使强大的散装整体由强的共价键相互联系。复合准晶体是通过单体浸润或逐层组件制成的。正在对机械性能和裂纹传播机制进行了相对研究的不同准晶陶瓷。预计他们将揭示以前没有看到任何其他材料的属性。 韧性，透明度和制备简单性的结合可能会导致陶瓷及其应用的变革性变化。

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