COLLABORATIVE RESEARCH: FLAME-GRADIENT SYNTHESIS OF TRANSITION METAL OXIDE NANORODS

合作研究：过渡金属氧化物纳米棒的火焰梯度合成

• 批准号: 0854433
• 负责人: Wilson Merchan-Merchan
• 金额: $ 17.52万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0854433&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; FLAME; GRADIENT; SYNTHESIS

0854433Merchan-MerchanThis collaborative research between teams at the University of Oklahoma (OU) and North Carolina State University (NCSU) intends to achieve controlled synthesis of transition-metal-oxide (TMO) nanoforms and to develop a scientific understanding of the underlying mechanisms. Flames have been successfully applied for the synthesis of high-demand nanomaterials such as metal and ceramic nanopowders, carbon fibers, carbon nanotubes, and fullerenes. As a nearly unexplored research area, the flame-gradient synthesis of TMO nanostructures is of fundamental and practical interest due to the potential variety and multifunctionality of the formed nanoforms, their unique properties, morphology and prospective applications.The team will use a flame-gradient method based on the interaction of a bulk metal support with a flame environment of varying temperature and chemical composition, a method they had pioneered. The successful preliminary experiments proved the applicability of this method for the synthesis of unique TMO nanostructures that have never been generated using flames or other traditional synthesis methods. The new research will extend the method to various important transition metals, such as molybdenum, tungsten, iron, cobalt, tantalum, chromium, vanadium, and zinc, to produce an experimental database on generated nanoforms and corresponding synthesis conditions. The focus of the proposed studies will be the confirmation of the key hypothesis that various 1-D TMO nanostructures can be generated in flames by a synergetic action of a highly reactive flame environment possessing strong thermal and chemical gradients. Within this collaborated research, the OU team will study the structure and morphology of generated nanoforms that will be analyzed using advanced material diagnostic techniques, and the NCSU group will conduct flame diagnostics and modeling to uncover the mechanisms. Flame chemistry, the nature of flame interaction with the metal surfaces, and the mechanism of the synthesis process will be closely studied.Broader impacts are both technological and educational. This research will serve as a fundamental basis for the development of novel technologies for flame synthesis of advanced TMO nanostructures with potential applications in electronics, medicine, chemistry, optics, sensors, recording and imaging media. The advantages of flame synthesis over other synthesis methods involve reduced cost, shorter processing times, improved scalability and quality. The method to be studied suggests essential economic and technological advances over current synthesis methods. Graduate and undergraduate students at OU and NCSU working on this interdisciplinary project will gain expertise in the fields of combustion, nanotechnology, and material synthesis. Underrepresented minority students will be encouraged and aided to start graduate school studies by providing them with a supportive and stimulating research experience during their junior and senior years. Additionally, the educational program involves high school teachers and students of North Carolina and Oklahoma communities by exposing them to the field of modern science via lectures, laboratory demonstrations, and hands-on experience.

0854433Merchan-MerchanththiS俄克拉荷马大学（OU）（OU）和北卡罗来纳州立大学（NCSU）团队之间的合作研究打算实现过渡金属氧化物（TMO）纳米型的受控综合，并对基础机构的科学理解进行科学理解。火焰已成功地用于合成高需求的纳米材料，例如金属和陶瓷纳米植物，碳纤维，碳纳米管和富勒烯。作为一个几乎没有探索的研究领域，由于形成的纳米型的潜在多样性和多功能性，它们的独特性能，形态和潜在的应用，团队将基于与烟灰的交互作用相互作用，因此它们的独特特性，形态和潜在的应用将具有与烟灰的相互作用相互作用，因此它们的独特特性，形态和潜在的应用将具有基于弗莱姆的化学效果和vary fle fles vary seption a vary soption and vary soption and vary and vary soption，因此TMO纳米结构的火焰梯度合成具有基本和实际的兴趣。成功的初步实验证明了这种方法适用于从未使用火焰或其他传统合成方法生成的唯一TMO纳米结构的合成。这项新研究将将该方法扩展到各种重要的过渡金属，例如钼，钨，铁，钴，塔塔尔，橘子，铬，钒和锌，以在产生的纳米型和相应的合成条件上产生实验性数据库。拟议的研究的重点将是确认关键假设，即通过具有强烈反应性火焰环境具有强大的热和化学梯度的高度反应性火焰环境的协同作用可以在火焰中产生各种1-D TMO纳米结构。在这项合作的研究中，OU团队将研究将使用先进材料诊断技术分析的生成纳米型的结构和形态，NCSU组将进行火焰诊断和建模，以发现机制。火焰化学，与金属表面的火焰相互作用的性质以及合成过程的机制将进行仔细研究。Broader的影响既具有技术和教育意义。 这项研究将是开发新技术的基本基础，用于在电子，医学，化学，光学，光学，传感器，记录和成像介质中使用潜在应用的高级TMO纳米结构。与其他合成方法相比，火焰合成的优点涉及成本降低，处理时间较短，可扩展性和质量的提高。要研究的方法提出了对当前合成方法的基本经济和技术进步。 OU和NCSU的研究生和本科生从事这个跨学科项目的工作将获得燃烧，纳米技术和材料合成领域的专业知识。 将鼓励并有助于他们在大三和大四时为他们提供支持和刺激的研究经验，从而鼓励并有助于他们开始研究生院学习。此外，教育计划涉及北卡罗来纳州和俄克拉荷马州社区的高中教师和学生，通过讲座，实验室示威和实践经验将其暴露于现代科学领域。