GOALI: Controlled Pore Size/Thickness Ultrathin Microporous/Mesoporous Films on Particles

在颗粒表面开发可控制孔径/孔隙率/厚度的超薄微孔/介孔膜是一种需要和机遇。应用包括防腐涂层、气体储存和催化剂封装，用于控制反应选择性和减少烧结，从而保持催化活性。本研究的成功完成将有助于更好地理解厚度和孔径可控的多孔氧化膜的制备，以及设计更耐烧结、选择性更高的催化剂。通过选择分子层沉积（MLD）杂化聚合物薄膜中的有机组分和去除有机组分，在MLD薄膜中形成孔隙的方法，可以控制薄膜的孔径。要研究的多孔膜形成的变量包括MLD前驱体化学、MLD反应温度和形成多孔结构的方法的影响。由于氧化层很薄（1-5纳米），预计它们不会显著降低所需反应的速率。因此，具体的目标是提高选择性和寿命，基本上没有损失所需的反应速率。负载型催化剂的催化性能可以通过选择氧化层的厚度、氧化孔的大小和氧化物的组成来设计。催化剂将通过氧化反应进行评价。ALD NanoSolutions, Inc.将为使用石英晶体微天平（QCM）研究新的MLD化学物质的学生提供访问和支持。此外，ALD NanoSolutions, Inc.将提供用于薄膜和反应研究的基线支持Pt/硅胶催化剂。更广泛的意义和重要性：制备具有可控厚度和孔径的高多孔氧化膜的能力将在制备热稳定的纳米催化剂方面取得重大进展。由于烧结和中毒是催化剂的两种主要失活机制，降低这些过程的速率将减少催化剂中所需贵金属的数量，增加使用寿命，并最终提高许多过程的经济性。该方法在大量催化过程中具有很大的应用潜力。其他重要的应用领域包括控制传感器和过滤设备的膜分离选择性，为H2气体储存或药物输送的活性剂的附着提供高表面积部分，等等。这项拟议的研究计划的更广泛的教育应用是通过将结果传播给粒子技术和催化界所作出的贡献。这项研究不仅是培养具有重要工业意义的博士生的绝佳工具，也是影响本科生和K-12外围推广的绝佳机会。研究生和本科生都将有机会在国家会议上展示他们的研究成果。从商业角度来看，ALD NanoSolutions公司已经同意与潜在客户一起测试优化的稳定Pt催化剂。

1067800PI: WeimerThere is a need and opportunity to develop controlled pore diameter/porosity/thickness ultra-thin microporous/mesoporous films on particles. Applications include corrosion protective coatings, gas storage, and catalyst encapsulation for controlling reaction selectivity and for reducing sintering, thus maintaining catalytic activity. Successful completion of this research will result in a better understanding of the fabrication of porous oxide films with controllable thickness and pore size and the design of catalysts that are more resistant to sintering and have higher selectivity. The pore size of the films can be controlled by selection of the organic component in the molecular layer deposited (MLD) hybrid polymer films and the method for removing the organic component, forming pores in the MLD films. Variables to be investigated for the formation of porous films include the effect of MLD precursor chemistry, MLD reaction temperatures, and methods for the formation of porous structures. Because the oxide layers are so thin (1-5 nm), they are not expected to significantly decrease the rate of the desired reaction. Thus, the specific goal is to increase selectivity and lifetime with essentially no loss in rate of the desired reactions. The catalytic properties of supported catalysts could then be designed by selecting the oxide layer thickness, the size of the oxide pores, and the composition of the oxide. The catalysts will be evaluated using oxidation reactions. ALD NanoSolutions, Inc. will provide access to and support for students using a quartz crystal microbalance (QCM) to investigate new MLD chemistries. Additionally, baseline supported Pt/silica gel catalyst to be used for the film and reaction studies will be provided by ALD NanoSolutions, Inc. Broader Significance and Importance: The ability to prepare highly porous oxide films with controllable thickness and pore size would make generational gains in the preparation of thermally stable catalyst nanoparticles. Since sintering and poisoning are two of the main deactivation mechanisms for catalysts, decreasing the rates of these processes would decrease the amount of precious metals required in catalysts, increase lifetimes and ultimately improve the economics of many processes. The proposed approach has great potential for application in a large number of catalytic processes. Other significant areas for application include controlling the selectivity of membrane separations for sensors and filtration devices, providing a high surface area moiety for functionalization for H2 gas storage or the attachment of active agents for drug delivery, among others. The broader educational application of this proposed research plan is the contribution that is anticipated through the dissemination of results to the particle technology and catalysis communities. This research is not only an excellent vehicle for training a Ph.D. students on an industrially significant project, but is an excellent opportunity to impact undergraduate students and peripheral K-12 outreach. Both graduate and undergraduate students will have opportunities to present their research results at national meetings. From a commercial perspective, ALD NanoSolutions, Inc. has agreed to test market the optimized stabilized Pt catalyst with their potential customers.