A Facile Route to a Novel Bilayer Hollow Particulate System

1236089PI：John这项研究是基于一项发现，即可以设计一种基于气雾剂的工艺来以一致和快速的方式制备中空亚微米颗粒。这一发现的新奇之处在于，这些颗粒的外壳可以被设计成组成两个不同的层，外部的亲水二氧化硅层和内部的疏水碳层。此外，这些颗粒含有铁基纳米颗粒，这使得它们具有磁性响应。这项研究背后的概念都是基于一个简单的假设，即特定的盐与表面活性剂形成桥联络合物，从而否定了表面活性剂在合成有序介孔材料中的模板作用。相反，一个薄薄的陶瓷壳形成，将化学成分锁定在中空颗粒的核心。这种颗粒的封闭性可以被用来设计各种新的颗粒形态，包括二氧化硅-碳和二氧化硅-二氧化钛双层体系，以及导致纳米角型颗粒体系产生的突起体系。所有这些颗粒形态都是新的，并在适当的组成水平上得到一致的结果。本研究试图深入了解颗粒形态的形成，验证壳层形成的假说，了解其共性。除了了解这一过程的基础研究外，还将在刺激诱导递送、光催化和开发新型胶体方面开发新的应用。中空亚微米粒子本质上与包括包埋和控制递送在内的各种技术密切相关。二氧化钛中空粒子在光催化和太阳能电池技术中有许多应用，磁性中空粒子可以用于成像技术。这项研究的其他应用包括开发稳定油滴的材料，因此与减少漏油技术有关。这项研究将与研究生教育、本科生研究经验和社区学院层面的推广工作紧密结合。

1236089PI: JohnThe research is based on the finding that an aerosol based process can be designed to prepare hollow submicron particles in a consistent and rapid manner. The novelty of the finding is that the shells of these particles can be designed to constitute two distinct layers, an outer hydrophilic silica layer and an inner hydrophobic carbon layer. Additionally, the particles contain iron based nanoparticles which makes them magnetically responsive. The concepts behind the research are all based on a simple hypothesis that specific salts form bridging complexes with surfactants that negate the templating effects of the surfactant in the synthesis of ordered mesoporous materials. Rather, a thin ceramic shell forms that locks in chemical constituents in the core of a hollow particle. This sealing of the particle can be exploited to design a variety of new particulate morphologies including silica-carbon and silica-titania bilayer systems and a system of protrusions leading to the generation of a nanohorn type particulate system. All these particle morphologies are new, and are consistently obtained at appropriate constituent levels. The research attempts to firmly understand the formation of the particulate morphologies and validate the hypothesis behind the shell formation and understand its generality. In addition to fundamental research to understand the process, new applications will be developed in stimuli induced delivery, in photocatalysis and in the development of novel classes of colloidosomes.Hollow submicron particles are intrinsically of much relevance to a variety of technologies including encapsulation and controlled delivery. Titania based hollow particles have a host of applications in photocatalysis and solar cell technologies, and magnetic hollow particles can be used in imaging technologies. Additional applications of the research include the development of materials to stabilize oil droplets and is thus relevant to oil spill mitigation technologies. The research will be integrated strongly with graduate education, undergraduate research experiences, and outreach efforts at the community college level.