BRIGE: Sustainable Methods for the Production of Anisotropic Metallic Nanoparticles Using Tunable Fluids

该BRIGE奖项支持气体膨胀液体（GXL）作为生产各向异性金属纳米颗粒的新型加工介质的研究;这些纳米颗粒显示出独特的形态依赖性。 研究目标是：1）在GXL中使用胶体定向组装合成各向异性纳米颗粒，2）证明快速分离各向异性纳米颗粒并使用GXL沉积成均匀有序阵列的有效方法，以及3）获得对控制GXL中各向异性纳米颗粒合成和加工的颗粒间相互作用和表面力的基本理解。 先前的工作已经研究了使用GXL（CO2和有机溶剂的低压混合物）和其他可调流体来合成和加工配体稳定的球形金属纳米颗粒。 在这里，可调流体，特别是GXL，将为生产用于各种应用的独特纳米材料提供可持续的手段。 GXL中的金和银纳米棒将通过开发种子介导的生长过程来产生;再加上GXL介导的处理，以产生均匀的纳米棒群体和长程有序的纳米棒阵列。 先进的表征技术和热力学建模将被用来获得对各向异性纳米颗粒合成和定向组装的基本理解，以进一步提高生产和加工能力。如果成功，这项工作将通过两个具体的理念来推进纳米材料合成和制造领域的知识：1）纳米颗粒合成和加工的可持续方法是可实现的，并且与用于大规模、经济和绿色纳米材料生产的传统方法相比具有显著优势。 2)合成各向异性纳米颗粒的基本驱动力是动力学控制的过程，其由定向组装而不是传统的胶体模板机制产生。

This BRIGE award supports the study of gas expanded liquids (GXLs) as a novel processing media for the production of anisotropic, metallic nanoparticles; which display unique morphology-dependent properties. The research objectives are to 1) synthesize anisotropic nanoparticles using colloidal directed assembly within GXLs, 2) demonstrate effective methods for the rapid size-fractionation of anisotropic nanoparticles and deposition into uniform, ordered arrays using GXLs, and 3) gain a fundamental understanding of the interparticle interactions and surface forces that govern the synthesis and processing of anisotropic nanoparticles in GXLs. Previous work has investigated the use of GXLs (low-pressure mixtures of CO2 and organic solvents) and other tunable fluids for the synthesis and processing of ligand-stabilized, spherical metallic nanoparticles. Here tunable fluids, specifically GXLs, will provide sustainable means for the production of unique nanomaterials for diverse applications. Gold and silver nanorods in GXLs will be produced by developing a seed-mediated growth processes; coupled with GXL mediated processing to yield uniform nanorod populations and long-range, ordered nanorod arrays. Advanced characterization techniques and thermodynamic modeling will be employed to gain a fundamental understanding of the anisotropic nanoparticle synthesis and directed assembly to further enhance production and processing capabilities.If successful, this work will advance knowledge in the field of nanomaterial synthesis and manufacture by campaigning two specific philosophies: 1) Sustainable methods of nanoparticle synthesis and processing are achievable and have significant advantages over conventional methodologies for large-scale, economic, and green nanomaterial production. 2) The fundamental driving force for the synthesis of anisotropic nanoparticles is kinetically controlled processes that result from directed assembly rather than conventional colloidal template mechanisms.