PECASE: Direct Measurement and Manipulation of Colloidal Interactions and Dynamics in Template Directed Photonic Crystal Assembly

摘要CTS-0346473 M。Bevan，Texas A& M UniversityCAREER：模板导向光子晶体组装中胶体相互作用和动力学的直接测量和操纵本提案涉及在界面模板上和存在外场的情况下组装单个光子胶体晶体中涉及的胶体相互作用的测量和操纵。目的是了解连接胶体力和流体动力学相互作用形成的热力学结构和动力学途径在界面的“自组装”和“驱动组装”过程中的基本机制。在这项工作中的一个中心任务是结合联合收割机全内反射，视频和共聚焦扫描激光显微镜技术来测量粒子粒子，粒子模板，粒子场相互作用在日益复杂的界面胶体系统，从单一的颗粒集中的三维分散体。与直接测量多体界面相互作用的能力，弱吸引力相关的胶体晶体自组装模板基板将通过微调温度和特定的离子依赖性聚合物分散力控制。为了避免形成不可逆的凝胶和停滞的玻璃结构，AC电泳驱动组装的中间亚稳晶体结构将被用来操纵光子晶体组装过程中的动力学路线。蒙特卡罗和斯托克斯动力学模拟将用于了解如何形成最佳平衡粒子配置以及如何控制动力学以避免动力学陷阱。每个提出的实验都提供了关于如何操纵胶体系统组装大型单界面光子晶体的补充信息，这对任何寻求在衬底上组装任意纳米和微米结构材料和器件的技术都具有广泛的意义。 拟议职业计划的智力价值是基于其在胶体长度，时间和能量尺度上操纵有序界面结构的根本意义，这些结构本质上是分子和宏观系统的中间体，因此对纳米科学和技术至关重要。本提案中的教育计划涉及广泛地将图像，视频，和动画从显微镜/模拟实验在我的研究小组到胶体复杂流体/纳米技术课程为本科生和格拉德生。我们的目标是使用可视化和多媒体工具，以帮助不同的学习风格的学生快速发展必要的心理图片，以保持胶体科学的物理直观的理解。因为我在研究中使用光学显微镜来探索基本的胶体现象，所以直接将图像和视频融入课堂讲座是我使用“真实的”多尺度研究实例热情地教授学生的自然方式，这也与化学工程课程改革举措相一致。作为开发可视化工具的一部分，德克萨斯州A M沉浸式可视化中心的虚拟现实演示将作为特殊课程讲座提供，并将通过现有的NSF赞助的校园计划作为经常外展工具，以代表性不足的群体，k-12学生和教师。为了评估课堂多媒体工具的有效性和优化实施，学校心理学的合作者。教育技术在得克萨斯州A M将有助于评估认知和教学方面的可视化为基础的讲座，与调查结果在教育期刊和全国会议上传播。拟议的职业生涯计划的更广泛的影响是直接使用显微镜和模拟视觉效果从我的研究课程和推广计划，以提高深度，速度，保留和学习的乐趣在未来的工程师的培训和提高科学素养的一般公众。

AbstractCTS-0346473M. Bevan, Texas A&M UniversityCAREER: Direct Measurement and Manipulation of Colloidal Interactions andDynamics in Template Directed Photonic Crystal AssemblyThis proposal is concerned with measurement and manipulation of colloidal interactions involved in the assembly of single photonic colloidal crystals on interfacial templates and in the presence of external fields. The objective is to understand fundamental mechanisms linking colloidal forces and hydrodynamic interactions to formation of thermodynamic structures and kinetic pathways in interfacial "self-assembly" and "driven assembly" processes. A central task in this work is to combine total internal reflection, video, and confocal scanning laser microscopy techniques to measure particle-particle, particle-template, and particle-field interactions in increasingly complex interfacial colloidal systems ranging from single particles to concentrated three dimensional dispersions. With the ability to directly measure many-body interfacial interactions, weak attractive forces relevant to colloidal crystal self-assembly on templated substrates will be controlled by finely tuning temperature and specific ion dependent polymeric dispersion forces. To avoid formation of irreversible gel and arrested glass structures, AC electrophoretic driven-assembly of intermediate metastable crystalline structures will be used to manipulate the kinetic route in photonic crystal assembly processes. Monte Carlo and Stokesian dynamics simulations will be used to understand how to form optimal equilibrium particle configurations and how to control dynamics to avoid kinetic traps. Each proposed experiment provides complementary information on how to manipulate colloid systems to assemble large single interfacial photonic crystals, which has broad significance for any technology that seeks to assemble arbitrary nano- and micro- structured materials and devices on substrates. The intellectual merit of the proposed career plan is based on its fundamental significance to manipulating ordered interfacial structures on colloidal length, time, and energy scales, which are inherently intermediate to molecular and macroscopic systems and therefore of utmost importance to nano- science and technology.The educational plan in this proposal involves extensively incorporating image, video, and animations from microscopy/simulation experiments in my research group into a colloidal complex fluids/nanotechnology course for both undergrad and grad students. The objective is to use visualization and multimedia tools to help students with different learning styles quickly develop mental pictures necessary to retain a physically intuitive understanding of colloid science. Because I employ optical microscopy to explore fundamental colloidal phenomena in my research, directly incorporating images and videos into class lectures is a natural way for me to passionately teach students using "real" multiscale research examples, which is also consistent with chemical engineering curriculum reform initiatives. As part of developing visualization tools, a virtual reality presentation in the Immersive Visualization Center at Texas A&M will be delivered as a special class lecture, and will also be used as a frequent outreach tool to underrepresented groups, k-12 students, and teachers through existing NSF sponsored campus programs. To assess the effectiveness and optimize the implementation of classroom multimedia tools, collaborators in School Psych./Ed. Tech. at Texas A&M will help to evaluate cognitive and pedagogical aspects of my visualization based lectures, with findings disseminated in education journals and at national conferences. The broader impact of the proposed career plan is related to the direct use of microscopy and simulation visuals from my research in courses and outreach programs to improve the depth, rate, retention, and enjoyment of learning in the training of future engineers and in improving scientific literacy of the general public.