CAREER: Confinement and flow effects on synthesis of sol-gel materials

职业：限制和流动对溶胶-凝胶材料合成的影响

• 批准号: 0645062
• 负责人: Amy Shen
• 金额: $ 40.05万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-01-01 至 2008-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0645062&HistoricalAwards=false
• 关键词: CAREER; Confinement; flow; effects; synthesis

National Science Foundation - Division of Chemical &Transport Systems Particulate & Multiphase Processes Program (1415)ABSTRACTIntellectual MeritThe long-term goal of this proposal is to generate fundamental understanding of geometric confinement and flow effects on the synthesis of new materials. Of major interest is the advances that will occur if micron-scale confinement and flow conditions can be harnessed as synthetic tools to make well-controlled nanoporous silica (NPS) materials. NPS materials are made by using self- assembling surfactants or copolymers as templates together with simultaneous sol-gel condensation of inorganic phase (e.g., silica) around the templates. To overcome the long turn-over times and restricted ability to precisely control the orientation of NPS that limiting traditional sol-gel processing, the PI's group recently proposed and validated a technique which exploits flow-induced transitions in surfactant solutions to generate supramolecular structures that act as directing agents for NPS synthesis. This proposal introduces a new approach designed to decouple the micelle formation process from micelle-silica assembly by using microfluidics as a means of confinement, combined with flow-induced self assembly and alignment, to offer break-throughs for the synthesis of tailored NPS materials with continuous manufacturing capacity. This research will combine systematic material synthesis, characterization, and modeling to study NPS synthesis from a mixture of silica-based and surfactant solutions using microfluidics.Broader ImpactsA comprehensive educational plan will integrate the proposed research with ongoing educational activities for both students and the general public to foster broad interest in complex fluids and nanotechnology by: (a) Creating undergraduate teaching modules and a graduate course to enhance existing courses and bridge various engineering departments in the college; (b) providing undergraduate and graduate student research opportunities, while continuing our well-established emphasis on recruiting and mentoring members of underrepresented groups; (c) building strong collaborations within academic, industrial, and public educational units. Results from this project will be directly incorporated in undergraduate and graduate courses and disseminated in Missouri Nanoalliance Communities. As part of our outreach effort, we will disseminate results via the St. Louis Science Center (SLSC) annual workshop on emerging technologies, annual workshop at WU, and Public Broadcasting System (PBS) documentary programs.

美国国家科学基金会 - 化学与运输系统部颗粒与多相过程计划 (1415) 摘要智力价值该提案的长期目标是形成对新材料合成的几何限制和流动效应的基本理解。人们最感兴趣的是，如果可以利用微米级的限制和流动条件作为合成工具来制造良好控制的纳米多孔二氧化硅（NPS）材料，将会出现的进步。 NPS材料是通过使用自组装表面活性剂或共聚物作为模板，同时在模板周围的无机相（例如二氧化硅）进行溶胶-凝胶缩合而制成的。为了克服限制传统溶胶-凝胶加工的长周转时间和精确控制 NPS 方向的能力有限，PI 团队最近提出并验证了一种技术，该技术利用表面活性剂溶液中的流动诱导转变来生成超分子结构，该结构可发挥作用作为 NPS 合成的导向剂。该提案引入了一种新方法，旨在通过使用微流体作为限制手段，结合流动诱导的自组装和排列，将胶束形成过程与胶束-二氧化硅组装分离，为合成定制的 NPS 材料提供突破。持续制造能力。这项研究将结合系统的材料合成、表征和建模，研究使用微流体从二氧化硅基和表面活性剂溶液的混合物中合成 NPS。更广泛的影响一个全面的教育计划将把拟议的研究与针对学生和公众的持续教育活动结合起来通过以下方式培养对复杂流体和纳米技术的广泛兴趣： (a) 创建本科生教学模块和研究生课程，以增强现有课程并在学院的各个工程系之间建立桥梁； (b) 提供本科生和研究生研究机会，同时继续我们一贯强调招募和指导代表性不足群体的成员； (c) 在学术、工业和公共教育单位之间建立强有力的合作。该项目的结果将直接纳入本科生和研究生课程，并在密苏里州纳米联盟社区传播。作为我们外展工作的一部分，我们将通过圣路易斯科学中心 (SLSC) 新兴技术年度研讨会、WU 年度研讨会以及公共广播系统 (PBS) 纪录片节目传播成果。