Collaborative/FRG Research: Nano-structured Materials of Covalently Bonded Networks

合作/FRG 研究：共价键网络的纳米结构材料

• 批准号: 0200839
• 负责人: Raj Singh
• 金额: $ 45万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0200839&HistoricalAwards=false
• 关键词: Collaborative; FRG; Research; Nano; structured

A large number of the technologically useful, unusual, and exciting superhard and superstrong materials such as diamond, carbon nanotubes, and SiC are derived from carbon by covalent bonding of C to itself, and with other elements such as N, B, and Si. There are an important class of amorphous, partially amorphous, and nano-crystalline materials such as diamond like carbon and highly tetrahedral amorphous carbon with unusual properties. It has been shown that the amorphous phase plays an important role in the nucleation and growth of diamond and cubic-BN upon non-equilibrium processing. The primary objectives of this focussed research group will be to: (1) synthesize unusual C-based covalently-bonded amorphous and nano-crystalline materials with controlled nano-structures and properties in the focussed region of the ternary (C-B-N) system, (2) develop/apply advanced techniques to characterize the nano-structures of these materials, and (3) relate the scale of the nano-structure and connectivity of the amorphous network to the selected properties. With this vision in mind, the premise of the proposed FRG is that the functionality/property of nano-structured materials in the form of thin films and coatings can be designed by employing a suitable nanoscale architecture and distribution of the basic structural building blocks to control the properties. In this FRG comprised of researchers at the University of Cincinnati and Prof. Kleebe at the CO School of Mines, the design of nano-structured thin films will go beyond just refining the polycrystalline microstructural scale, to exploring the amorphous routes for synthesizing, characterizing, and controlling the nano-structure of new materials in order to achieve unusual mechanical, physical, thermal, and possibly other properties. Thus, materials will be first designed and synthesized/produced to have only short-range order and then nano-structured thin films will be created by clever modifications of the non-equilibrium processing methods, and kinetic/thermal manipulation of the networks/nanostructues to create nano-crystalline thin films. The eventual aim of these activities will be to develop predictive tools for designing and synthesizing materials with unusual properties so that a knowledge base for "creating materials by design" will be obtained. On a broader scale, a successful completion of this research will lead to a knowledge base for designing nano-structured materials in C-B-N ternary with unusual mechanical and physical properties for applications in machining, electronic devices, MEMS, and functional/protective coatings. In particular, the scientific understanding of the role of the nano-scale structure, microstructure, and interfacial materials in creating novel materials will be obtained. Graduate and undergraduate students and research associate/post doc will be trained through participation on this research project and their theses. A new course on Plasma Processing of Thin Films will be developed and taught to undergraduate and graduate students. In addition, minority/women high school students will be mentored and exposed to this research through NASA-SHARP program at University of Cincinnati.

大量在技术上有用的、不寻常的和令人兴奋的超硬和超强材料，如钻石、碳纳米管和碳化硅，都是由碳与碳本身以及与其他元素如N、B和Si共价键合而得到的。有一类重要的非晶态、部分非晶态和纳米晶材料，如类金刚石碳和高度四面体非晶碳，具有特殊的性质。结果表明，非晶相在非平衡加工过程中对金刚石和立方氮化硼的形核和生长起着重要作用。这个重点研究小组的主要目标将是：(1)在三元(C-B-N)系统的聚焦区合成具有可控纳米结构和性能的不寻常的碳基共价键合非晶和纳米晶材料，(2)开发/应用先进的技术来表征这些材料的纳米结构，以及(3)将纳米结构的规模和非晶网络的连通性与所选择的性质联系起来。考虑到这一愿景，建议的FRG的前提是，可以通过采用合适的纳米级架构和基本结构构建块的分布来控制性能来设计薄膜和涂层形式的纳米结构材料的功能/性能。在这个由辛辛那提大学的研究人员和CO矿业学院的Kleebe教授组成的FRG中，纳米结构薄膜的设计将不仅仅是细化多晶微结构尺度，还将探索非晶态路线，用于合成、表征和控制新材料的纳米结构，以实现非凡的机械、物理、热学和可能的其他性能。因此，材料将首先设计和合成/生产仅具有短程有序的材料，然后通过巧妙地修改非平衡处理方法和对网络/纳米结构进行动力学/热操纵来创建纳米结构薄膜。这些活动的最终目的将是开发用于设计和合成具有特殊性能的材料的预测性工具，以便获得“通过设计创造材料”的知识库。在更广泛的范围内，这项研究的成功完成将为设计具有特殊机械和物理性能的C-B-N三元纳米结构材料提供知识库，用于机械加工、电子设备、MEMS和功能/保护涂层。特别是，对纳米结构、微结构和界面材料在创造新材料中的作用将获得科学的理解。研究生和本科生以及研究助理/博士后将通过参与本研究项目和他们的论文进行培训。将开发一门关于薄膜等离子体处理的新课程，并向本科生和研究生讲授。此外，少数族裔/女性高中生将通过辛辛那提大学的NASA-Sharp项目接受这项研究的指导和接触。