STRUCTURAL ORIGINS IN PHOTOSWITCHABLE ORGANIC FERROELECTRICITY USING TIME-RES

使用时间分辨率的光开关有机铁电结构起源

• 批准号: 8172008
• 负责人: LIN CHEN
• 金额: $ 1.7万
• 依托单位: UNIVERSITY OF CHICAGO
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8172008
• 关键词: Chemicals; Computer Retrieval of Information on Scientific Projects Database; Funding; Grant; Hydrogen Bonding; Information Storage; Institution; Interdisciplinary Study; Molecular Motors; Property; Research; Research Personnel; Resources; Rotation; Side; Source; Techniques; Time; United States National Institutes of Health; Universities; Work; absorption; beamline; chemical synthesis; electron donor; emission spectroscopy; repaired; success; time use

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Organic ferroelectric materials are important for applications of information storage, molecular motors and actuators. The advantages of organic ferroelectric materials over their inorganic counter part are their chemical tunability, processibility and self-repair capability. Therefore, understanding the structural origins in organic ferroelectric materials and their connections to the properties of the materials is crucial in developing new materials with broad applications. The proposed work will investigate the structural origins of a group of photo-switchable organic ferroelectric materials made of small aromatic organic electron donors (D) and acceptors (A) self-assembled into alternating three dimensional DADA? arrays by steady-state and time-resolved x-ray diffraction techniques at Beamline 14ID of the APS. The structural origins for such photoswitchable ferroelectric materials are structural changes either due to change of the DA distances or rotation of the side groups that form or disrupt the hydrogen bonds. Using TR-XRD, Collet, Techert, et al. carried out pioneering studies on similar type of materials with power diffraction at ESRF. We are encouraged by their success and believe that our materials can be studied by the TR-XRD with Laue diffraction on single crystals at Beanline 14ID. We would like to capture the structural origins that enable the ferroelectricity and distinguish different types of the structural changes. The proposed structural studies will be combined with single crystal ultrafast transient absorption and emission spectroscopy conducted in our labs in Northwestern University. The structural information obtained at the APS and spectroscopic and theoretical as well as chemical synthesis will enable a productive interdisciplinary research to discover, character, and applying new materials.

该副本是利用众多研究子项目之一 由NIH/NCRR资助的中心赠款提供的资源。子弹和 调查员（PI）可能已经从其他NIH来源获得了主要资金， 因此可以在其他清晰的条目中代表。列出的机构是 对于中心，这不一定是调查员的机构。 有机铁电材料对于信息存储，分子电机和执行器的应用很重要。 有机铁电材料比其无机柜台的优点是它们的化学可调节性，加工性和自我修复能力。 因此，了解有机铁电材料的结构起源及其与材料特性的连接对于开发具有广泛应用的新材料至关重要。拟议的工作将研究由小型芳族有机电子供体（D）和受体（a）自组装成交替的三维DADA的一组可切换有机铁电材料的结构起源？稳态和时间分辨的X射线衍射技术的阵列在AP的光束线14ID处。这种可拍照的铁电材料的结构起源是由于DA距离的变化或形成或破坏氢键的侧基的旋转而导致的结构变化。 使用TR-XRD，Collet，Techert等。在ESRF时对具有功率衍射的类似材料进行开创性研究。他们的成功使我们感到鼓舞，并认为我们的材料可以通过TR-XRD在Beanline 14ID的单晶上使用LAUE衍射进行研究。我们想捕获能够使铁电性和区分不同类型的结构变化的结构起源。 拟议的结构研究将与我们西北大学实验室进行的单晶超快瞬态吸收和发射光谱相结合。 在APS和光谱和理论以及化学合成中获得的结构信息将使生产性跨学科研究能够发现，性质和应用新材料。