CAREER: In Situ Microscopy and Spectroscopy of Dynamic Behavior on Surfaces

职业：表面动态行为的原位显微镜和光谱学

• 批准号: 9733821
• 负责人: Jochen Lauterbach
• 金额: $ 26万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733821&HistoricalAwards=false
• 关键词: CAREER; Situ; Microscopy; Spectroscopy; Dynamic

Abstract - Lauterbach - 9733821 Prof. Jochen Lauterbach or Purdue University will follow mesoscopic spatio-temporal dynamics of catalytic surfaces with in-situ high-resolution methods based on imaging ellipsometry, IR vibrational, and second-order non-linear optical spectroscopy. The main objective is to identify periodic phenomena that occur because of nonlinear coupling of effects due to mesoscopic features such as surface heterogeneity or site diversity. The potentially synergistic effects will be exploited to conceive new catalysts based on tailored surface heterogeneity. CO and hydrocarbon oxidation simultaneously with NOx reduction will be studied on Rh-BaO-Pt catalyst surfaces microfabricated with spatially resolved compositional difference, or CeO2 on Pt and Cu foils, under reaction conditions resembling automobile exhaust catalysis. External forcing of reaction-diffusion systems will be effected by pulsed IR laser heating, leading to better understanding of resonant forcing effects on CO oxidation, and to unsteady state reactor operation in general. Modeling and simulation of reaction, diffusion, and pattern formation will also be carried out. A second reaction system to be investigated is spatially resolved photoinduced polymerization, which may lead to new compositionally modulated thin polymeric films. UV-initiated, mask-shadowed, gas-phase polymerization of acrolein, methacrolein, and styrene on various transition metal surfaces (Ag, Cu, Pt), will be followed up to a micron thickness by SSHG, which is sensitive to interfacial structure. Likewise, the bonding, electronic, and structural details during the initial polymerization steps will be studied under high vacuum conditions with IR absorption or SFG simultaneously with EMSI or SSHG. This research links electronic, molecular, mesoscopic and macroscopic parameters for reaction-diffusion phenomena that are important in various areas: catalysis, semiconductor manufacturing, biological and polymeric coating deposition. At the educa tional level, Prof. Lauterbach will renew the chemical engineering laboratory courses with experiments in surface chemistry, catalysis, nanoscale mechanics, polymer engineering, holography, and optical engineering, coupled with newer evaluation and teaching methods based on interactive electronic media.

摘要-劳特巴赫- 9733821 普渡大学的Jochen劳特巴赫教授将采用基于成像椭圆偏振法、红外振动和二阶非线性光谱的原位高分辨率方法，跟踪催化表面的介观时空动力学。其主要目的是识别由于介观特征（如表面异质性或网站多样性）的非线性耦合效应而发生的周期性现象。潜在的协同效应将被利用来构思基于定制表面异质性的新催化剂。CO和碳氢化合物的氧化与NOx的还原同时进行研究的Rh-BaO-Pt催化剂表面的空间分辨的组成差异，或CeO 2的Pt和Cu箔，类似汽车尾气催化的反应条件下，微制造。反应扩散系统的外部强迫将受到脉冲红外激光加热的影响，从而更好地理解CO氧化的共振强迫效应，以及一般的非稳态反应器操作。还将进行反应、扩散和图案形成的建模和模拟。第二个反应体系是空间分辨光致聚合，这可能会导致新的成分调制的聚合物薄膜。紫外线引发的，掩模遮蔽，气相聚合的丙烯醛，甲基丙烯醛，和苯乙烯在各种过渡金属表面（银，铜，铂），将遵循到微米厚度的SSHG，这是敏感的界面结构。同样，在初始聚合步骤期间的键合、电子和结构细节将在高真空条件下用IR吸收或SFG与EMSI或SSHG同时进行研究。该研究将反应扩散现象的电子，分子，介观和宏观参数联系起来，这些现象在各个领域都很重要：催化，半导体制造，生物和聚合物涂层沉积。在教育层面，劳特巴赫教授将更新化学工程实验室课程，包括表面化学、催化、纳米力学、聚合物工程、全息术和光学工程等实验，并采用基于交互式电子媒体的更新的评估和教学方法。