STTR Phase I: UV-Photocatalytic TiO2 Films on Nanosized Ferromagnetic Substrate Particles

这一小型企业技术转移(STTR)第一阶段项目旨在将原子层沉积(ALD)在纳米铁磁性颗粒上沉积的复合紫外光催化二氧化钛纳米薄膜商业化。铁纳米颗粒是在ALD工艺之前原位形成的，在每个单独的衬底纳米颗粒的表面上沉积有共形的、无针孔的、化学结合的二氧化钛薄膜。衬底铁颗粒保持较高的磁矩，并由二氧化钛薄膜保护不被氧化。新型催化剂颗粒可用于被动净化受污染的溪流，然后可从净化的位置磁移除并再生以供进一步使用。单个超细颗粒的ALD纳米涂层可以控制单个超细颗粒的表面化学，这是一项与更传统的CVD、PVD、PE-CVD或湿化学溶液处理相比无与伦比的技术。现在有可能制造出具有设计的电、磁、光、机械、流变性或其他特性的超细颗粒。这种功能化超细粉末的市场包括微电子、国防、硬质合金、化妆品、药物输送、催化材料、含能材料和聚合物/陶瓷纳米复合材料等。

This Small Business Technology Transfer (STTR) Phase I project provides for the commercialization of composite UV-photocatalytic TiO2 nanofilms deposited by Atomic Layer Deposition (ALD) on nanosized ferromagnetic iron particles. The iron nanoparticles are formed in-situ prior to ALD processing where conformal, pinhole-free, chemically bonded films of TiO2 are deposited on the surface of each individual substrate nanoparticcle. The substrate iron particles maintain a high magnetic moment and are protected from oxidation by the TiO2 film. The novel catalyst particles can be used to passively decontaminate polluted streams and can then be removed magnetically from the decontaminated sites and regenerated for further use. The ALD nanocoating of individual ultrafine particles to control individual ultrafine particle surface chemistry is enabling technology that is unparalleled compared to more conventional CVD, PVD, PE-CVD, or wet chemistry solution processing. It is now possible to produce ultrafine particles with designed electrical, magnetic, optical, mechanical, rheological, or other properties. Markets for such functionalized ultra-fine powders include microelectronics, defense, hardmetals, cosmetics, drug delivery, catalytic materials, energetic materials, and polymer/ceramic nanocomposites, among others.