CAREER:Asymmetric Functionalization of 2-D Nanomaterials for Tailored Assemblies

职业：用于定制组件的二维纳米材料的不对称功能化

• 批准号: 1955170
• 负责人: Emily Pentzer
• 金额: $ 22.25万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1955170&HistoricalAwards=false
• 关键词: CAREER; Asymmetric; Functionalization; Nanomaterials; Tailored

PART 1: NON-TECHNICAL SUMMARYIn both nature and the synthetic world, particulate materials on the nanoscale play an important role in meeting a wide range of societal needs, from harvesting solar energy to making medicine more efficient to preventing barnacle growth on the underside of ships. As such, controlling how nanoparticles organize into larger structures could lead to major advances in these areas. The research focus of this CAREER project is to develop an entirely new class of tailored nanomaterials and to assemble them into well defined geometries. Specifically, nanosheets that are only a few atoms thick (graphene oxide) will be functionalized on each face with polymers that have different properties (such as positive and negative charges). These unique structures, called Janus nanosheets, will have properties that are not currently accessible with even current state-of-the art technology and have potential to improve the properties of coatings, medicines, batteries, lubricants, etc. Moreover, this work will help researchers across many fields understand how nanoparticle organization influences and dictates properties so they can be improved. This project will afford interdisciplinary training for the next generation of scientists and engineers, as well as engage elementary school students in science through hands-on demonstrations. The PI will mentor researchers at the high school, undergraduate, and graduate levels of their education, develop an after-school interactive class on hydrophilicity and hydrophobicity for elementary school students, and prepare college students for careers beyond academia through a professional development course for scientists. PART 2: TECHNICAL SUMMARYThe goal of this research is to develop and evaluate a new class of materials for the controlled spatial and temporal organization of nanoparticles in assemblies, as a route to rationally design and optimize form, function, and application. To this end, Janus graphene oxide (GO) nanosheets will be synthesized by the asymmetric functionalization of the two faces of GO with different polymers. The functionality of these Janus GO nanosheets can be tailored to give unique and well-defined hybrid and responsive assemblies. Three specific systems will be exploited to show the properties of these novel materials: 1) Janus GO nanosheets functionalized with phase separating polymers for organization in a defined direction within a polymer host to prepare composite films with directional conductivity, mechanical strength, and gas barrier properties; 2) Janus GO nanosheets functionalized with polymers that can bind to nanoparticles for assembly into well-defined, higher order, and hybrid assemblies with inorganic nanoparticles to improve charge transport, catalysis, and energy storage; and 3) Janus GO nanosheets functionalized with stimuli responsive polymers to reversibly scroll and wrinkle platelets in a responsive manner for dynamic control of gas adsorption and conductivity. The key outcomes of this work will provide the fundamental principles governing structure-property relationships of nanoparticle assemblies such that transformational advances in technological applications can be realized. This work will also provide a framework within which to technically train future scientists at the high school, undergraduate, and graduate levels, as well as engage the interest of elementary students in science through hands-on lessons. Moreover, through this CAREER project at Case Western Reserve University, a professional development course for senior undergraduate and early graduate students will be developed, helping students attain career skills needed for success beyond academia.

第一部分： 在自然界和合成世界中，纳米级颗粒材料在满足广泛的社会需求方面发挥着重要作用，从收集太阳能到使药物更有效，再到防止船舶底部的藤壶生长。 因此，控制纳米颗粒如何组织成更大的结构可能会导致这些领域的重大进展。这个CAREER项目的研究重点是开发一种全新的定制纳米材料，并将它们组装成定义明确的几何形状。具体来说，只有几个原子厚的纳米片（氧化石墨烯）将在每个面上用具有不同性质（如正电荷和负电荷）的聚合物官能化。这些独特的结构，称为Janus nanosheets，将具有即使是当前最先进的技术目前也无法获得的特性，并有可能改善涂料，药物，电池，润滑剂等的性能，此外，这项工作将帮助许多领域的研究人员了解纳米颗粒组织如何影响和支配性能，以便改进它们。该项目将为下一代科学家和工程师提供跨学科培训，并通过实践演示让小学生参与科学。PI将指导高中，本科和研究生教育水平的研究人员，为小学生开发关于亲水性和疏水性的课后互动课程，并通过科学家的专业发展课程为大学生准备学术界以外的职业生涯。第二部分： 本研究的目标是开发和评估一类新的材料，用于控制组装中纳米颗粒的空间和时间组织，作为合理设计和优化形式，功能和应用的途径。为此，Janus氧化石墨烯（GO）纳米片将通过不同聚合物对GO的两面进行不对称官能化来合成。这些Janus GO纳米片的功能可以定制，以提供独特和明确定义的混合和响应组件。将利用三种特定的系统来显示这些新材料的性质：1）用相分离聚合物官能化的Janus GO纳米片，用于在聚合物主体内以限定的方向组织，以制备具有定向导电性、机械强度和气体阻隔性质的复合膜; 2）用聚合物官能化的Janus GO纳米片，所述聚合物可以结合到纳米颗粒以组装成明确定义的、更高阶的，和具有无机纳米颗粒的混合组件，以改善电荷传输、催化和能量储存;和3）用刺激响应性聚合物官能化的Janus GO纳米片，以响应性方式可逆地卷曲和起皱血小板，用于动态控制气体吸附和导电性。这项工作的主要成果将提供纳米粒子组装体的结构-性质关系的基本原理，从而实现技术应用的转型进展。这项工作还将提供一个框架，在此框架内，在高中，本科和研究生水平的技术培训未来的科学家，以及从事小学生在科学的兴趣，通过实践经验教训。此外，通过凯斯西储大学的职业生涯项目，将为高年级本科生和早期研究生开发专业发展课程，帮助学生获得学术界以外成功所需的职业技能。