CAREER: Understanding Electrostatic Interactions in Non-Polar Media for Generation of Nanostructured Thin Films

职业：了解非极性介质中的静电相互作用以生成纳米结构薄膜

• 批准号: 1055594
• 负责人: Daeyeon Lee
• 金额: $ 57.5万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-02-15 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1055594&HistoricalAwards=false
• 关键词: CAREER; Understanding; Electrostatic; Interactions; Non

TECHNICAL SUMMARY: The objective of this CAREER award, co-funded by the Solid State and Materials Chemistry (SSMC) program and the Office of International Science and Engineering (OISE), is to understand a recently developed non-aqueous layer-by-layer (LbL) assembly of nanostructured thin films by studying the fundamentals of electrostatic interactions in non-polar media. This work bridges the fundamental investigation of electrostatic interactions between oppositely charged materials at the single particle level to the prediction of the composition and structure of nanostructured LbL thin films based on the charge characteristics of individual nanoparticles. The nature and significance of electrostatic interactions in non-polar media at the single particle level will be studied using atomic force microscopy, which will also reveal how the surface potential and charge of oppositely charged particles change at small separations. The thermodynamic nature of LbL assembly of oppositely charged materials in apolar solutions will also be investigated using isothermal titration calorimetry to uncover whether the nanoparticle assembly is an entropically or enthalpically driven process. Knowledge from these studies will be combined and translated to quantitatively predict and understand the composition and structure of LbL thin films based on the charge characteristics of individual nanoparticles. NON-TECHNICAL SUMMARY: Nanostructured thin films are thin layers composed of multiple materials such as nanoparticles and polymers, and possess distinctive combinations of properties that make them useful for advanced applications such as energy conversion and storage. Layer-by-layer (LbL) assembly, which involves the sequential deposition of oppositely charged species, provides a simple yet versatile method for the generation of functional nanostructured thin films; however, this technique, to date, has been primarily used with water-soluble materials. This practice places a major obstacle to generating functional nanostructured thin films for alternative energy applications, because a large number of useful and unique nanomaterials are synthesized and stable in non-aqueous non-polar solvents only. The PI has recently successfully imparted surface charge to various nanomaterials in non-polar media and fabricated functional nanostructured thin films based on LbL assembly. The aim of this CAREER award is to understand the fundamental aspects of electrostatic interactions in non-polar solvents, which will further extend the new LbL technique for alternative energy applications. This CAREER award also integrates educational activities into the research plan with the goal of fully utilizing visual and hands-on aspects of layer-by-layer assembly to enrich the educational experiences of pre-college students and educators. Under-represented minority and female undergraduate students will participate in "Research Abroad" program at the Ulsan National Institute of Science and Technology in Korea, which will provide them with opportunities to broaden their view of the world and develop scientific communication skills.

技术摘要：该职业奖的目标是由固态和材料化学（SSMC）计划和国际科学与工程办公室（OISE）共同资助的，是要了解最近开发的非潮流的逐层（LBL）通过研究非极性培养基中静电相互作用的基本面来组装纳米结构薄膜。 这项工作将基于单个纳米颗粒的电荷特性的纳米结构LBL薄膜的组成和结构预测，对单个粒子水平的相对带电材料之间的静电相互作用的基本研究。将使用原子力显微镜研究非极性培养基在单个粒子水平上静电相互作用的性质和意义，这也将揭示带有电荷颗粒的表面电势和电荷如何在小分离下发生变化。 还将使用等温滴定量热法研究纳米颗粒组件是熵或焓驱动的过程是，还将研究Acolol溶液中具有相对电荷材料的LBL组装的热力学性质。 这些研究的知识将被合并和翻译，以根据单个纳米颗粒的电荷特性进行定量预测和理解LBL薄膜的组成和结构。非技术摘要：纳米结构薄膜是由多种材料（例如纳米颗粒和聚合物）组成的薄层，并具有独特的特性组合，使其可用于诸如能量转换和存储之类的高级应用。涉及相对电荷物种的顺序沉积的逐层（LBL）组件为生成功能性纳米结构薄膜的生成提供了一种简单而多功能的方法。但是，迄今为止，该技术主要与水溶性材料一起使用。这种做法是为替代能源应用生成功能性纳米结构薄膜的主要障碍，因为仅在非水性非极性溶剂中合成了大量有用和独特的纳米材料。 PI最近成功地将表面电荷授予了基于LBL组装的非极性培养基和制造的功能性纳米结构薄膜的各种纳米材料。该职业奖的目的是了解非极性溶剂中静电相互作用的基本方面，这将进一步扩展新的LBL技术用于替代能源应用。该职业奖还将教育活动纳入研究计划，目的是充分利用逐层集会的视觉和动手方面，以丰富大学前学生和教育工作者的教育经历。 代表不足的少数民族和女本科生将参加韩国乌尔士国家科学技术研究所的“国外研究”计划，这将为他们提供扩大对世界的看法并发展科学沟通技巧的机会。