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DMREF: Collaborative Research: Programming mesostructured colloidal soft matter through complex quenching and annealing

DMREF：协作研究：通过复杂的淬火和退火对介观结构胶体软物质进行编程

基本信息

批准号：
1760106
负责人：
Roseanna Zia
金额：
$ 39.12万
依托单位：
Stanford University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2021-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1760106&HistoricalAwards=false
关键词：
DMREF Collaborative Research Programming mesostructured

项目摘要

The project supports integrated experiments, modeling and simulations to enable new ways of controlling material properties through thermal processing of colloidal materials. The goal is to develop new colloidal suspensions with temperature-sensitive interactions, and strategies by which they can be controllably processed into colloidal solids with desired structure and mechanical properties through quenching, annealing and tempering. The development of these new tools and the knowledge they create could lead to transformative new and scalable processing methods for colloidal materials with well-controlled and novel properties, and potentially impact a range of technologies including artificial tissue scaffolds, separation membranes, and inks for additive manufacturing. The research will be integrated with educational activities to train students in a new approach to making colloidal solids having unique structures and properties.Thermal processing has long been known and employed for atomic and molecular materials, but has been elusive in colloidal materials because of a lack of colloidal systems with easily controlled temperature-responsive behavior, as well as a dearth of fundamental understanding for how the thermal history influences the development and arrest of structural morphologies and features in these systems. In this project, these challenges will be overcome using newly developed thermoresponsive colloids, and large-scale simulations and experiments that can rapidly probe the multitude of possible thermal histories and structures that emerge from them. Experiments and simulation will be combined to characterize how kinetic trajectories in thermodynamic variables map onto the relevant descriptors of emergent structural correlations and material properties including rheology. Leading efforts will establish categorical behavior for quenches in the homogeneous fluid phase, as well as in both metastable (binodal) and unstable (spinodal) regions of phase coexistence, followed on by more complex quenches involving annealing in more than one of these regions to seek out novel structures and rheology. Doing so will enable a more fundamental understanding for how kinetic processes of gelation, phase separation and glass formation compete in colloidal fluids to initiate, evolve and eventually arrest structure, and how the features of the arrested structure control the linear and non-linear mechanics of the material. This fundamental understanding will be used to develop a new conceptual framework for using thermal processing to design and engineer colloidal materials with well-specified structure and properties.

该项目支持综合实验，建模和模拟，以通过胶体材料的热处理实现控制材料特性的新方法。目标是开发具有温度敏感相互作用的新型胶体悬浮液，以及通过淬火、退火和回火将其可控地加工成具有所需结构和机械性能的胶体固体的策略。这些新工具的开发及其创造的知识可能会为具有良好控制和新颖特性的胶体材料带来变革性的新的和可扩展的加工方法，并可能影响一系列技术，包括人工组织支架，分离膜和增材制造油墨。这项研究将与教育活动相结合，培养学生掌握一种新的方法来制造具有独特结构和性能的胶体固体。热处理早已被人们所知，并被用于原子和分子材料，但由于缺乏具有容易控制的温度响应行为的胶体系统，以及缺乏对热历史如何影响这些系统中结构形态和特征的发展和停止的基本理解。在这个项目中，这些挑战将通过使用新开发的热响应胶体以及大规模模拟和实验来克服，这些模拟和实验可以快速探测大量可能的热历史和从中出现的结构。实验和模拟将结合起来，以表征如何在热力学变量的动力学轨迹映射到新兴的结构相关性和材料特性，包括流变学的相关描述符。领先的努力将建立分类的行为淬火在均匀的流体相，以及在亚稳（双节）和不稳定（spinodal）的相共存的区域，其次是更复杂的淬火，涉及退火在这些区域中的一个以上，以寻求新的结构和流变学。这样做将能够更根本地理解凝胶化，相分离和玻璃形成的动力学过程如何在胶体流体中竞争以启动，演变并最终捕获结构，以及捕获结构的特征如何控制材料的线性和非线性力学。这种基本的理解将用于开发一个新的概念框架，用于使用热处理来设计和工程设计具有指定结构和特性的胶体材料。