Engineering Research Equipment: A FTIR Spectrometer Coupled with an Ultraviolet Light Source for Polymerization Reaction Engineering and Catalysis

PIs计划购买一台傅里叶变换红外光谱仪（FTIR），供科罗拉多大学化学工程系使用。该仪器将用于研究紫外光引发聚合和紫外光催化的分子过程。FTIR光谱仪具有研究这些过程所需的高分辨率（0.3 cm-1）和高速度（每秒20次扫描），即使在室温下也是快速的。除了光谱仪和相关的计算机外，还将购买光纤紫外光源、滤光片和多个内反射附件，同时将建造用于催化研究的可控气氛细胞。该光谱仪将配备两个样品/检测室，以便两名研究人员可以有效地使用。利用紫外光引发高交联聚合物的聚合反应，并采用一种新的技术研究反应扩散终止机理。这项技术包括在紫外线关闭后监测双键转换的微小变化。通过这种方式，反应扩散的重要性将被确立，反应扩散常数将被测量。在二氧化钛催化剂上光催化氧化有机物的过程中，用FTIR光谱仪测量了反应物和中间体表面浓度的变化以及吸附中间体的鉴定。这些瞬态测量将有助于识别反应步骤和测量其速率，当结合质谱检测反应产物。温度程序解吸和反应也将用于确定吸附质浓度。增加一台FTIR光谱仪将加强这些领域目前正在进行的资助研究。预计该光谱仪在其他聚合和催化研究中也具有一定的应用价值。目前，工程学院没有红外光谱仪。两位pi都有在其他大学使用FTIR光谱仪的经验。科罗拉多大学将分享该设备购买价格的40%，设备将由两家pi的研究经费维持。

Bowman 9500477 The PIs plan to purchase a Fourier Transform Infrared (FTIR) Spectrometer for use within the Department of Chemical Engineering at the University of Colorado. This instrument will be used to study the molecular processes involved in UV-initiated polymerizations and in UV photocatalysis. The FTIR spectrometer has the high resolution (0.3 cm-1) and high speed (20 scans per second) required to study these processes, which are fast even at room temperature. In addition to the spectrometer and associated computer, a fiber-optic UV light source, filters, and multiple internal reflectance accessory will be purchased while a controlled-atmosphere cell for catalytic studies will be constructed. This spectrometer will be equipped with two sample/detection compartments so that it can effectively be used by two investigators. Polymerization reactions for the production of highly cross-linked polymers will be initiated by the UV light, and a novel technique for studying reaction diffusion termination mechanisms will be employed. This technique involves monitoring small changes in the double bond conversion after the UV light has been turned off. In this manner the importance of reaction diffusion will be established, and the reaction diffusion constant will be measured. The changes in surface concentrations of reactants and intermediates and identification of adsorbed intermediates will be measured with the FTIR spectrometer during photocatalytic oxidation of organics on titania catalysts. These transient measurements will help identify reaction steps and measure their rates when combined with mass spectrometric detection of reaction products. Temperature-programmed desorption and reaction will also be used to identify adsorbate concentrations. The addition of an FTIR spectrometer will enhance funded research that is currently in progress in these areas. It is anticipated that the spectrometer will also be valuable in other polymerization and catalysis research. At presen t, there is no IR spectrometer in the College of Engineering. Both PIs have experience at other universities with FTIR spectrometers. The University of Colorado will aost share 40% of the purchase price of this equipment, and the equipment will be maintained by research grants of the two PIs.