Nanostructured Organic-Inorganic Hybrids from AB Diblock and ABC Triblock Copolymers

AB 二嵌段和 ABC 三嵌段共聚物的纳米结构有机-无机杂化物

• 批准号: 0312913
• 负责人: Ulrich Wiesner
• 金额: $ 15万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-01 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0312913&HistoricalAwards=false
• 关键词: Nanostructured; Organic; Inorganic; Hybrids; AB

With a program on nanostructured organic-inorganic hybrid material from AB diblock and ABC triblock copolymers, the PI proposes research in one of the most promising and rapidly emerging research areas in materials science. Two areas of research are described. First, studies on bicontinous cubic hybrid phases are proposed which involve the formation of magnetic crystalline moieties within confined environments. THis mimics a strategy of living organisms to build skeletal parts through formation of polycrystalline assemblies inside self-assembled matrices. The work will elucidate fundamental questions about the stability of fascinating bicontinous cubic morphologies in organic-inorganic hybrids. If successful, this part has the potential to lead to novel mesoporous materials for the efficient separation of proteins. The targeted materials would have large, easily accessible pores and supoerparamagnetic nanoparticles embedded in the walls combining size exclusion and magnetic interactions for separation. Second, the PI wants to explore how the polymer chemistry of AB diblock and ABC triblock copolymers can be exploited to exert unprecedented structure control on the molecular as well as the mesoscopic length scale of organic-inorganic hybrids. If successful, this part of the proposed project could lead to more benign chemistries towards nanostructured silica-type materials that mimic natural systems (e.g., neutral pH and ambient temperatures). It also has the potential to lead to dramatically improved morphology control that currently can not be obtained in top-down approaches. For example, if similar morphologies as observed in linear ABC triblock copolymers could be realized, unique bulk mechanical properties are expected. Furthermore, an expansion of the "tool-box" of nano-objects with controlled shap, size, and composition towards rings or helices could be achieved. Both have potential impact on the field of nanotechnology. The proposed program builds on the progress made over the last two and a half years in the PI's laboratory. A particular strength of this proposal derives from the continuation of very fruitful interactions with several individuals at Cornell and abroad (Max-Planck-Institute for Polymer Research Mainz, Germany) that have outstanding reputation in their field. The proposed research program is highly interdisciplinary. It is positioned at the interface of two traditional areas of materials research, namely, polymer science and ceramics science. It will thus provide student training and learning both in the fields of polymers science and solid state chemistry while simultaneously advancing discovery and understanding in the emerging field of nano-structured organic-inorganic hybrid materials. Furthermore, the work is balanced between synthesis, characterization, and property studies so that the students will gain knowledge in a broad spectrum of techniques including anionic polymerization, sol-gel processing, small angle x-ray scattering (SAXS), transmission electron microscopy (TEM), and solid-state NMR. The project allows effective use of the infrastructure provided at Cornell, including work on a novel energy filtering electron microscope (EFTEM) enabling elemental mapping and at Cornell's High Energy synchrotron Source (CHESS) for high resolution x-ray studies. In parallel to the research program the PI proposes in collaboration with the Educational Program Office of Cornell's Center for Materials Research (CCMR) to expand the multifaceted outreach program that has been constructed over the past two and a half yeats in his group. Cornell is situated in one of the poorest and least developed regions of the US posing a particular responsibility to Cornell faculty to help educate the public in Cornell' region and beyond in issues related to the science and engineering of materials. The program will include components of training and development of human resources including the participation of underrepresented groups (training of postdoctoral researchers and students, in volvement of undergraduates, teacher programs, K-12 programs), efforts to enhance the infrastructure for research and education through facilities and instrumentation, and industrial outreach.

通过AB二嵌段和ABC三嵌段共聚物的纳米结构有机-无机杂化材料计划，PI提出了材料科学中最有前途和最迅速新兴的研究领域之一的研究。 两个领域的研究进行了说明。 首先，提出了双连续立方混合相的研究，其中涉及在受限环境中形成磁性结晶部分。 这模拟了生物体通过在自组装基质内形成多晶组装体来构建骨骼部件的策略。 这项工作将阐明关于有机-无机杂化材料中迷人的双连续立方形貌的稳定性的基本问题。 如果成功，这部分有可能导致新的介孔材料用于蛋白质的有效分离。 目标材料将具有大的、容易进入的孔和嵌入壁中的超顺磁性纳米颗粒，结合尺寸排阻和磁性相互作用进行分离。 其次，PI希望探索如何利用AB二嵌段和ABC三嵌段共聚物的聚合物化学对有机-无机杂化物的分子和介观长度尺度施加前所未有的结构控制。 如果成功的话，拟议项目的这一部分可能会导致更良性的化学反应，以模拟自然系统的纳米结构二氧化硅型材料（例如，中性pH和环境温度）。 它也有可能导致显着改善的形态控制，目前无法获得自上而下的方法。 例如，如果可以实现如在线性ABC三嵌段共聚物中观察到的类似形态，则预期独特的本体机械性能。 此外，可以实现具有受控形状、大小和组成的纳米物体的“工具箱”向环或螺旋的扩展。 两者都对纳米技术领域具有潜在的影响。 拟议的计划建立在PI实验室过去两年半取得的进展的基础上。 这一建议的一个特别的优势来自于与康奈尔大学和国外（马克斯普朗克聚合物研究所美因茨，德国）的几个人在其领域享有盛誉的非常富有成效的互动。 拟议的研究计划是高度跨学科的。 它位于材料研究的两个传统领域，即聚合物科学和陶瓷科学的界面。 因此，它将为学生提供聚合物科学和固态化学领域的培训和学习，同时推进纳米结构有机-无机杂化材料新兴领域的发现和理解。 此外，这项工作是合成，表征和性能研究之间的平衡，使学生将获得知识，在广泛的技术，包括阴离子聚合，溶胶-凝胶处理，小角X射线散射（SAXS），透射电子显微镜（TEM）和固态NMR。 该项目允许有效地利用康奈尔大学提供的基础设施，包括一种新型能量过滤电子显微镜（EFTEM）的工作，使元素映射和康奈尔大学的高能同步加速器源（CHESS）的高分辨率X射线研究。 在研究计划的同时，PI建议与康奈尔大学材料研究中心（CCMR）的教育计划办公室合作，扩大在过去两年半中在他的小组中建立的多方面外展计划。 康奈尔大学位于美国最贫穷和最不发达的地区之一，康奈尔大学的教师负有特殊的责任，帮助教育康奈尔大学地区内外的公众，了解与材料科学和工程有关的问题。 该计划将包括培训和人力资源开发的组成部分，包括代表性不足的群体的参与（博士后研究人员和学生的培训，本科生的参与，教师计划，K-12计划），努力通过设施和仪器加强研究和教育的基础设施，以及工业推广。