Collaborative Research: Transport and Separation through Virus-Structured Nanoporous Membranes

合作研究：通过病毒结构纳米多孔膜进行运输和分离

• 批准号: 1264958
• 负责人: Matthew McCarthy
• 金额: $ 24.03万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-02-15 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1264958&HistoricalAwards=false
• 关键词: Collaborative; Research; Transport; Separation; through

McCarthy/Maroo 1264949 / 1264958The objective of the proposed collaborative research is to investigate transport and separation phenomena through the protein channel of the tobacco mosaic virus (TMV) using an integrated research methodology combining molecular analysis and simulations along with direct experimental characterization. The TMV is a rigid, hollow, rod-shaped plant virus with a 4-nm diameter central pore defined by 2130 helical coat proteins wrapped around a single strand of RNA. It is an extremely stable bio-molecule, withstanding temperatures of up to 60 degrees C and a pH range of 2 to 11. The surface of the central pore is negatively charged, making it attractive for ion exclusion. The outer surface of the TMV has been genetically modified to facilitate near-vertical assembly and metallization onto various materials. This feature provides a mechanism to develop virus-structured membranes using large-scale industrially relevant manufacturing schemes. Due to its stability, structure, surface charge, and manufacturability, the TMV can potentially transform membrane manufacture for biological and chemical separations. This collaborative research project will bring together the expertise of one PI (Maroo) in molecular dynamics simulations and numerical modeling with a second PI (McCarthy) in TMV biotemplating and nanoscale fabrication. The project will focus on the following numerical and experimental investigations: (1) Determination of the surfaces properties of the TMV central pore, (2) Numerical and molecular modeling of overlapping electric double layers, (3) Molecular dynamics simulations of transport and ionic exclusion through the TMV central pore, (4) Fabrication of virus-structured nanoporous membranes using the self-assembly of the TMV, (5) Experimental characterization of transport phenomena through the TMV membranes, and (6) Experimental characterization of separation through the TMV including size and ionic exclusion. The synergy of these two components (numerical and experimental) will result in a comprehensive understanding of transport and separation through the TMV and demonstrate the potential of TMV-structured membranes for water filtration and chemical and biological separations. The advantages of utilizing biological building blocks in nano-engineered systems include low cost, structural versatility, inherent self-assembly properties, and the ability to tune structure through genetic modifications and environmental control. The knowledge base gained in this work will act as a catalyst for future development in the field of separations and the nanomanufacturing of bio-derived membranes. Broader Impacts. This work will build on the PI's existing participation in Drexel's NSF-funded GK-12 program on the NAE's Grand Challenges (focusing on water desalination) and Syracuse University's Project Engage where the PI holds workshops on modern engineering solutions for K-12 female students. Outreach will extend to pre-college students, particularly those from underrepresented groups in the Philadelphia metropolitan and Syracuse areas and will focus on exposing undergraduates, women, and minorities to multidisciplinary research through integrated research-education initiatives. Undergraduate students at both Drexel and Syracuse will be recruited for research opportunities and participation in the Workshops on Nanoscale Transport through Protein Channels developed by the PIs in the proposed work.

McCarthy/Maroo 1264949 /1264958拟议的合作研究的目的是调查通过烟草花叶病毒（TMV）的蛋白质通道的运输和分离现象，使用分子分析和模拟沿着直接实验表征相结合的综合研究方法。 TMV是一种刚性、中空、杆状的植物病毒，具有由2130个螺旋外壳蛋白包裹在单链RNA周围限定的直径为4 nm的中心孔。 它是一种非常稳定的生物分子，可承受高达60摄氏度的温度和2至11的pH值范围。 中心孔的表面带负电荷，使其对离子排斥具有吸引力。 TMV的外表面已经过基因修饰，以便于接近垂直的组装和金属化到各种材料上。 该特征提供了使用大规模工业相关制造方案开发病毒结构膜的机制。 由于其稳定性、结构、表面电荷和可制造性，TMV可以潜在地改变用于生物和化学分离的膜制造。 这个合作研究项目将汇集一个PI（Maroo）在分子动力学模拟和数值建模方面的专业知识，第二个PI（McCarthy）在TMV生物模板和纳米级制造方面。 该项目将侧重于以下数值和实验研究：（1）确定TMV中心孔的表面性质，（2）重叠双电层的数值和分子模拟，（3）通过TMV中心孔的传输和离子排斥的分子动力学模拟，（4）使用TMV的自组装制造病毒结构的纳米多孔膜，（5）通过TMV膜的传输现象的实验表征，和（6）通过TMV的分离的实验表征，包括尺寸和离子排阻。 这两个组成部分（数值和实验）的协同作用将导致通过TMV的运输和分离的全面理解，并证明了TMV结构的水过滤和化学和生物分离膜的潜力。 在纳米工程系统中利用生物构建块的优点包括低成本、结构多功能性、固有的自组装特性以及通过遗传修饰和环境控制来调整结构的能力。 在这项工作中获得的知识基础将作为催化剂的分离和生物衍生膜的纳米制造领域的未来发展。 更广泛的影响。 这项工作将建立在PI参与Drexel的NSF资助的GK-12计划的基础上，该计划涉及NAE的重大挑战（重点是水淡化）和锡拉丘兹大学的项目参与，PI为K-12女学生举办现代工程解决方案研讨会。 外展将扩大到大学预科学生，特别是那些来自费城大都市和锡拉丘兹地区代表性不足的群体，并将侧重于通过综合研究教育计划，使本科生，妇女和少数民族接触多学科研究。 德雷克塞尔大学和锡拉丘兹大学的本科生将被招募参加由PI在拟议工作中开发的蛋白质通道纳米级运输研讨会。