Collaborative Research: Integrated Design of Ultrahigh Surface Area Conductive Materials

多孔材料在许多应用中具有巨大的潜力，但是在合成和制造可以在高温下操作并导电的高表面积多孔材料中存在许多挑战。该奖项支持旨在整合理论，实验和计算模拟的研究，以了解和实现一类新的高温稳定和可膨胀表面积多孔材料，称为碳氧化硅（SiOC）。这种多孔材料在催化、气体分离、传感、电极、分子筛、热绝缘和微反应器中具有令人兴奋的应用。它们的高热稳定性将使新的应用在传统材料失效的苛刻条件下。该计划整合了多层次的教育和推广活动，并将提供培训，以多个研究生和本科生，在材料实验和模拟研究，并在两个大学校园。本项目旨在了解SiOC材料的组成和结构之间的关系，以及合成具有高比表面积，高温稳定性和高导电性的材料的潜力。该团队将通过定制聚合物前体以及定制交联和热解条件来创建纳米级孔和域。通过选择性地去除相分离的物质，该方法将提供具有5nm孔和非常期望的电导率的高表面积和高温稳定的材料。多尺度原子模型（从头算和大尺度分子动力学）将耦合到实验，并提供洞察力的键合特性在不同阶段之间的界面，相分离的驱动力，石墨子结构的演变，以及在纳米级的宏观性能。粗颗粒模型将结合联合收割机的实验和计算数据，并提供了一个前所未有的和独特的平台来模拟和设计聚合物到陶瓷的转化和后热解处理。该研究将为SiCN、SiOCN、SiBCN、SiOBC、SiAlCN和SiAlOC等具有超导电性的超表面积高温材料的分子设计和加工提供新的范例。

Porous materials have great potential in a number of applications, but many challenges exist in the synthesis and manufacturing of high surface-area porous materials that can operate at high temperatures and conduct electricity. This award supports research aiming to integrate theory, experiment, and computational simulations to understand and enable a new class of high temperature stable and ultrahigh surface area porous materials known as silicon oxycarbides (SiOC). Such porous materials have exciting applications in catalysis, gas separation, sensing, electrodes, molecular sieves, thermal insulation, and micro-reactors. Their high thermal stability will enable new applications under harsh conditions where traditional materials have failed. The program integrates multi-layered education and outreach activities and will provide training to multiple graduate and undergraduate students, in materials experimental and simulation research and across two university campuses. This project is aimed at understanding the relationship between the composition and structure of SiOC materials, and the potential for synthesizing materials with high surface area, high temperature stability, and high electrical conductivity. The team will create nanosized pores and domains by tailoring polymer precursors, as well as tailoring crosslinking and pyrolysis conditions. By selective removal of phase-separated species, the approach will provide ultrahigh surface area and high temperature stable materials with 5 nm pores and much desired electrical conductivity. Multi-scale atomistic modeling (ab-initio and large-scale molecular dynamics) will couple to experiment and provide insight in bonding characteristics at interfaces between different phases, driving forces for phase segregation, the evolution of the graphitic substructure, as well as macroscopic properties governed at the nanoscale. A coarse-grain model will combine experimental and computational data and provide an unprecedented and unique platform to model and design the polymer-to-ceramic transformation and post-pyrolysis treatment. This research will establish a new paradigm in molecular design and processing of ultrahigh surface area, high temperature materials with electrical conductivity beyond SiOC, such as SiCN, SiOCN, SiBCN, SiOBC, SiAlCN, and SiAlOC.