Directing Self-Assembly of Liquid Crystalline Block Co-Oligomers in Combined Optical and Magnetic Fields
光磁场组合中液晶嵌段共聚低聚物的定向自组装
基本信息
- 批准号:2223705
- 负责人:
- 金额:$ 60万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-09-01 至 2026-08-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
NON-TECHNICAL SUMMARYMaterials scientists seek to understand how the properties of materials are related to their structure and to develop methods to create the structures needed to achieve desired properties. Traditionally, scientists have focused on structure in terms of the arrangement of atoms and molecules that result naturally from the chemical composition of a material. However, in recent years new research has demonstrated that novel and often unanticipated properties can be realized by using human-made or synthetic material structures. This project aims to enable the creation of programmed spatial variation of optical and mechanical properties in polymeric materials as a new route to realize synthetic structures that can give rise to useful properties. This project aim will be advanced by fundamental studies that examine optically-driven structural transitions in designed light-responsive polymers and the magnetic field response of such polymers. Synthetic structures will be developed by the use of spatially-controlled dynamic light exposure in concert with magnetic fields. This project addresses a fundamental knowledge-gap regarding optically driven structural transitions in polymers, and processing methodologies to readily create spatial variation of properties in such systems. Controlling the spatial variation of properties provides a route for programming material function, and is sought in a variety of energy and microelectronics-related applications. It is therefore anticipated that this project will have broader impacts given the implications for the development of new materials in these sectors. This project involves a range of additional broader impacts including a new K-12 outreach program, the development of curriculum, a focus on recruiting diverse researchers, and the involvement of undergraduate researchers.TECHNICAL SUMMARYControlling structural order in self-assembled polymers remains a critically important focus of research for materials scientists. Spatio-temporal control of optical fields, in concert with magnetic fields, could provide a highly versatile means of processing such materials. In this context, there is a critical need to understand and engineer photoswitchable ordering self-assembling polymers, and to develop new modalities for guiding self-assembly using optical fields. This project is centered on molecular design and characterization of photoswitchable liquid crystalline block co-oligomers (LC BCOs), and the development of strategies for controlling their structural order using optical fields, and optical fields in combination with magnetic fields. These systems provide a rich landscape in which to explore ordering transitions in the presence of optical fields, and in which to develop new modes of directed self-assembly using optical fields in concert with magnetic fields. The proposed work targets these opportunities and is geared overall towards developing new materials and understanding their structure-property relationships, and leveraging photo-responsive ordering to realize new, more versatile, modalities for directed self-assembly. The specific objectives are:1. Elucidate phase behavior and photo-driven ordering in LC BCOs and their blends2. Create spatially-varying textures programmed by spatially-varying optical fields3. Develop combined optical and magnetic field processingThe intellectual merit stems from the systematic exploration of self-assembly and phase behavior of a still emerging class of macromolecules, and the realization of a versatile modality for directed self-assembly that has been elusive to date. Successfully executed, the proposed work will provide critical insight regarding the manipulation of effective interactions in LC BCOs using optical fields and will enable the realization of complex spatially varying textures with unprecedented fidelity.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
材料科学家试图了解材料的特性如何与其结构相关,并开发方法来创建实现所需特性所需的结构。传统上,科学家们一直专注于结构方面的原子和分子的排列,这些排列是由材料的化学成分自然产生的。然而,近年来的新研究表明,通过使用人造或合成材料结构可以实现新颖且通常意想不到的特性。该项目旨在使聚合物材料的光学和机械性能的程序化空间变化成为实现可产生有用性能的合成结构的新途径。该项目的目标将通过基础研究来推进,这些基础研究将检查设计的光响应聚合物中的光驱动结构转变以及此类聚合物的磁场响应。合成结构将通过使用空间控制的动态曝光与磁场相结合来开发。该项目解决了有关聚合物中光学驱动结构转变的基本知识差距,以及在此类系统中轻松创建属性空间变化的加工方法。控制性能的空间变化为编程材料功能提供了一条途径,并在各种能源和微电子相关应用中寻求。因此,鉴于对这些部门新材料开发的影响,预计该项目将产生更广泛的影响。该项目涉及一系列额外的更广泛的影响,包括一个新的K-12推广计划,课程的发展,注重招募不同的研究人员,并参与本科研究人员。技术总结控制自组装聚合物的结构顺序仍然是材料科学家的研究的一个至关重要的焦点。光场的时空控制,与磁场相结合,可以提供一种处理这种材料的高度通用的手段。在这种情况下,有一个关键的需要,了解和工程的光开关有序自组装聚合物,并开发新的模式,引导自组装使用光场。该项目的重点是光开关液晶嵌段共聚低聚物(LC BCOs)的分子设计和表征,以及使用光场控制其结构顺序的策略的开发,以及光场与磁场的组合。这些系统提供了一个丰富的景观,在其中探索光场存在下的有序过渡,并在其中开发新的模式,定向自组装使用光场与磁场。拟议的工作目标是这些机会,并全面面向开发新材料和了解其结构-性能关系,并利用光响应排序来实现新的,更通用的定向自组装模式。具体目标是:1.阐明液晶BCO及其共混物中的相行为和光驱动有序性2。通过空间变化的光学场编程创建空间变化的纹理3.发展结合光和磁场处理的智力价值源于系统的探索自组装和相行为的一个仍然新兴的一类大分子,并实现了一个通用的模式,为定向自组装,一直难以捉摸的日期。成功执行后,拟议的工作将提供有关使用光场操纵LC BCO中有效交互的关键见解,并将能够以前所未有的保真度实现复杂的空间变化纹理。该奖项反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
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Chinedum Osuji其他文献
Chinedum Osuji的其他文献
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