Formation and Engineering of Spatiotemporal Structure: Studies in Electrochemistry

时空结构的形成与工程：电化学研究

• 批准号: 0317762
• 负责人: John Hudson
• 金额: $ 25.67万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-15 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317762&HistoricalAwards=false
• 关键词: Formation; Engineering; Spatiotemporal; Structure; Studies

Research: The PI is investigating the formation and control of spatiotemporal patterns in chemically reacting systems and is thus contributing to the emerging branch of research on the engineering of chemical complexity. The work is largely experimental and is a test-bed for existing idealized theories although a few modeling studies relating to the experiments will also be carried out. The study will add to the fundamental understanding of the interaction of coupling and reaction in chemically reacting systems. The delineation of the relative importance of short-range and long-range coupling has relevance to general chemical reactor design. He is investigating the effects of external signals on developed patterns and the relationship between the imposed temporal scales and resulting spatial scales. A recently discovered phenomenon in chemically reacting systems, the development of clusters in which various regions of a reacting system synchronize but remain different from the remainder of the reaction area, is being investigated in detail; both stationary and temporally varying clusters are to be studied. He is developing addressable arrays and investigating the effects of spatially inhomogeneous forcing and feedback signals on reactions, both metal electrodissolution reactions and electrocatalytic reactions. The input of temporally and spatially varying signals gives improved control over reaction conditions. The relationship between temporal and spatial scales is exemplified and is being exploited in high resolution patterning of metal surfaces with the use of ultra-short voltage pulses. Broader Impacts: The research addresses fundamental issues that are driven by practical applications of commercial importance. Corrosion of metals has a major recurring impact on the national economy. The oxidation of small organic molecules and of hydrogen is of potential importance in several applications including fuel cells and electro-organic synthesis. The ability to manipulate temporal and spatial structures with ultra-short voltage pulses has direct applications in the electrochemical machining of metals. The work on engineered pattern formation can lead to improved reactivity and selectivity in chemically reacting systems.A strong emphasis of these studies is on the training of students. The PI endeavors to broaden the participation of underrepresented groups. At the present time two of his six graduate students are women and in the past ten years three African-American graduate students have completed their PhD studies. The PI is presently associated with a training grant from NIH for minority students along with other faculty at Virginia, Northwestern, and Morehouse. He carries out extensive collaborative studies with international partners in Germany, China, Mexico, and Lithuania; as part of these studies he has an active exchange of graduate students. He plans to continue his participation in presentation of his work in the USA and overseas; this includes workshops organized for students and investigators from third world countries.

调研：PI正在研究化学反应系统中时空模式的形成和控制，从而为化学复杂性工程研究的新兴分支做出贡献。 这项工作在很大程度上是实验性的，是现有的理想化理论的试验台，但也将进行一些与实验有关的建模研究。 该研究将增加对化学反应体系中耦合和反应相互作用的基本理解。 短程耦合和长程耦合的相对重要性的描述与一般化学反应器的设计有关。 他正在研究外部信号对发展模式的影响，以及强加的时间尺度和由此产生的空间尺度之间的关系。 最近发现的现象，在化学反应系统中，集群的发展，其中反应系统的各个区域同步，但仍然不同于其余的反应区，正在详细研究;固定和随时间变化的集群进行研究。 他正在开发可寻址阵列，并研究空间不均匀的强制和反馈信号对反应的影响，包括金属电溶解反应和电催化反应。 时间和空间变化信号的输入可以改善对反应条件的控制。 的时间和空间尺度之间的关系的例子，并被利用在高分辨率图案化的金属表面与超短电压脉冲的使用。 更广泛的影响：该研究解决了由具有商业重要性的实际应用驱动的基本问题。 金属的腐蚀对国民经济有着重大的影响。 小有机分子和氢的氧化在包括燃料电池和电有机合成的若干应用中具有潜在的重要性。 利用超短电压脉冲操纵时间和空间结构的能力在金属的电化学加工中具有直接应用。 工程图案形成的研究可以提高化学反应体系的反应性和选择性，这些研究的重点是培养学生。 PI努力扩大代表性不足群体的参与。 目前，他的六名研究生中有两名是女性，在过去十年中，有三名非裔美国研究生完成了博士研究。 PI目前与美国国立卫生研究院的少数民族学生培训补助金沿着在弗吉尼亚州，西北部和莫尔豪斯的其他教师。 他与德国、中国、墨西哥和立陶宛的国际合作伙伴进行了广泛的合作研究;作为这些研究的一部分，他积极交换研究生。 他计划继续参与在美国和海外介绍他的工作;这包括为来自第三世界国家的学生和调查人员组织的讲习班。