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：这一职业奖由固态与材料化学(SSMC)计划和国际科学与工程办公室(OISE)共同资助，旨在通过研究非极性介质中静电相互作用的基本原理，了解最近开发的纳米结构薄膜的非水逐层(LBL)组装。这项工作为在单个粒子水平上研究相反电荷材料之间的静电相互作用奠定了基础，并基于单个纳米粒子的电荷特性预测了纳米结构LBL薄膜的组成和结构。原子力显微镜将在单粒子水平上研究非极性介质中静电相互作用的性质和意义，这也将揭示在小间隔时相反电荷粒子的表面电势和电荷是如何变化的。此外，还将使用等温滴定量热法研究相反电荷物质在非极溶液中的LBL组装的热力学性质，以揭示纳米粒子组装是熵驱动的过程还是热驱动的过程。来自这些研究的知识将被结合并转化为基于单个纳米粒子的电荷特征来定量预测和了解LBL薄膜的组成和结构。非技术概述：纳米结构薄膜是由纳米粒子和聚合物等多种材料组成的薄层，具有独特的性能组合，使其适用于先进的应用，如能量转换和存储。逐层组装(LBL)是一种连续沉积相反电荷物种的方法，它提供了一种简单而通用的方法来制备功能纳米结构薄膜；然而，到目前为止，这种技术主要用于水溶性材料。这种做法给制备用于替代能源的功能性纳米结构薄膜带来了主要障碍，因为大量有用和独特的纳米材料只能在非水、非极性的溶剂中合成和稳定。最近，PI成功地在非极性介质中将表面电荷赋予了各种纳米材料，并基于LBL组装制备了功能纳米结构薄膜。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，这将进一步扩大新的LBL技术在替代能源应用中的应用。这一职业奖项还将教育活动融入研究计划，目的是充分利用层层组装的视觉和动手方面，丰富预科学生和教育工作者的教育经验。代表不足的少数民族和女性本科生将参加韩国蔚山国立科学技术学院的“海外研究”项目，这将为他们提供开阔世界观和发展科学交流技能的机会。