University of Minnesota Materials Research Science and Engineering Center

明尼苏达大学材料研究科学与工程中心

• 批准号: 2011401
• 负责人: Christopher Leighton
• 金额: $ 1800万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Cooperative Agreement
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2011401&HistoricalAwards=false
• 关键词: University; Minnesota; Materials; Research; Science

Non-Technical Description: This Materials Research Science and Engineering Center (MRSEC) at the University of Minnesota features two Interdisciplinary Research Groups (IRGs). The first team aims to access novel electronic and magnetic properties by direct application of strong local electric fields to promising new materials. This Quantum Leap aligned research will realize ready control over an extraordinary range of electronic phases and functions, thereby enabling new approaches to low-power magnetic data storage and processing, neuron-like computation, and nanophotonic devices such as solar cells. The second team is developing novel and systematic approaches to assembling polymeric materials into bicontinuous network structures with superior property combinations. These will advance multiple applications, including membranes for removal of viruses and bacteria, selective ion transport media for new battery designs, therapeutic delivery vehicles, and materials to manipulate light more efficiently in photovoltaic devices. The investigators provide extensive research experiences for promising undergraduates from a national network of four-year colleges, minority serving institutions, and especially tribal colleges. Summer camps for high school students, drawn from the Twin Cities and from Native American communities across the upper Midwest, involve senior investigators, students, and postdoctoral fellows in hands-on laboratory activities. Entertaining demonstration shows to illustrate fundamental scientific principles engage over 50,000 K-12 students each year. Close interaction with industry involves knowledge transfer in a pre-competitive collaboration with over 25 companies. Shared experimental facilities provide access to state-of-the-art materials characterization instrumentation to a national base of over 500 users.Technical Description: IRG-1 aims to transform the understanding of mechanisms, capabilities, and applications of electrolyte-based gating, thereby realizing electrical control over an extraordinary range of electronic phases and function. Both electrostatic and electrochemical control are central to elucidating the biggest challenges facing ionic gating, and thus the development of ionic devices. These include understanding: when and why electrostatics vs. electrochemistry dominate; limits on speed, reversibility, and property modulation; interfacial structure, chemistry, and ion-carrier interactions; and universality of the approach. Three target materials classes are envisioned to tackle these issues – metal oxides, metal chalcogenides, and molecular conductors – chosen for alignment with key open issues and extraordinary functionality. The overarching goal of IRG-2 is to identify and translate design principles that direct small molecule self-assembly to oligomeric and polymeric shape-filling amphiphiles to form robust and functional mesoscopic network materials. Self-assembly strategies enable bottom-up design of nanostructured materials with tailored functionalities, accessing morphologies and properties exceeding those of their constituent building blocks. The interpenetrating microdomains of three-dimensional networks enable independent tuning of orthogonal properties in a single material. Crucially, the narrow composition windows over which networks typically form currently restricts their translation to applications. The team’s approach centers on identifying packing motifs that destabilize lamellar and cylindrical morphologies to broaden the composition phase windows of negative Gaussian curvature network phases. Control of phase selection and defect density by advanced processing in films and in bulk is also an important additional target.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述：明尼苏达大学的材料研究科学与工程中心（MRSEC）设有两个跨学科研究小组（IRGs）。第一个团队的目标是通过直接将强局部电场应用于有前途的新材料来获得新的电子和磁性能。这项与Quantum Leap相关的研究将实现对大量电子相位和功能的随时控制，从而为低功耗磁数据存储和处理、类神经元计算和纳米光子器件（如太阳能电池）提供新方法。第二个团队正在开发新的系统方法，将聚合材料组装成具有优越性能组合的双连续网络结构。这将推动多种应用，包括去除病毒和细菌的膜，用于新电池设计的选择性离子传输介质，治疗递送载体，以及在光伏设备中更有效地操纵光的材料。调查人员为来自全国四年制大学、少数民族服务机构、特别是部落学院的有前途的本科生提供了广泛的研究经验。夏令营的高中学生来自双子城和中西部北部的美国原住民社区，包括高级调查员、学生和博士后参与动手实验室活动。每年有超过5万名K-12学生参加有趣的演示节目，展示基本的科学原理。与行业的密切互动包括与超过25家公司在竞争前合作中的知识转移。共享的实验设施为全国500多名用户提供了最先进的材料表征仪器。技术描述：IRG-1旨在改变对基于电解质的门控的机制，能力和应用的理解，从而实现对大量电子相位和功能的电气控制。静电和电化学控制都是阐明离子门控面临的最大挑战的核心，因此离子器件的发展。其中包括理解：静电学与电化学学何时以及为何占主导地位；对速度、可逆性和特性调制的限制；界面结构、化学和离子载流子相互作用；以及方法的普遍性。为了解决这些问题，我们设想了三种目标材料——金属氧化物、金属硫族化合物和分子导体——选择它们来解决关键的开放问题和非凡的功能。IRG-2的首要目标是确定和翻译设计原则，指导小分子自组装成寡聚和聚合物形状填充的两亲体，以形成坚固和功能的介观网络材料。自组装策略可以实现自底向上设计具有定制功能的纳米结构材料，获得超越其组成构建块的形态和特性。三维网络的互穿微畴使单一材料的正交特性能够独立调谐。至关重要的是，网络通常形成的狭窄组合窗口目前限制了它们对应用程序的转换。该团队的方法集中在确定破坏层状和圆柱形形态的填充基序，以扩大负高斯曲率网络相的组成相窗。通过薄膜和块状的先进加工来控制相选择和缺陷密度也是一个重要的附加目标。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Stable Photoemission from the Wehnelt Aperture Surface in 4D Ultrafast Electron Microscopy

4D 超快电子显微镜中韦内尔特孔径表面的稳定光电发射

• DOI: 10.1093/micmic/ozad067.1103
• 发表时间: 2023
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Willis, Simon A;Flannigan, David J
• 通讯作者: Flannigan, David J

High-resolution analogue of time-domain phonon spectroscopy in the transmission electron microscope

• DOI: 10.1098/rsta.2019.0598
• 发表时间: 2020-10
• 期刊: Philosophical Transactions of the Royal Society A
• 作者: Elisah J. VandenBussche;D. Flannigan

Blending Polyurethane Thermosets Using Dynamic Urethane Exchange

使用动态聚氨酯交换混合聚氨酯热固性材料

• DOI: 10.1021/acs.macromol.1c01910
• 发表时间: 2021
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: Swartz, Jeremy L.;Sheppard, Daylan T.;Haugstad, Greg;Dichtel, William R.
• 通讯作者: Dichtel, William R.

Critical length scales for chemical heterogeneity at Cu/Nb 3D interfaces by atom probe tomography

通过原子探针断层扫描得出 Cu/Nb 3D 界面化学异质性的临界长度尺度

• DOI: 10.1016/j.scriptamat.2022.115078
• 发表时间: 2023
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Li, Zezhou;Cheng, Justin Y.;Poplawsky, Jonathan D.;Xu, Shuozhi;Baldwin, Jon K.;Beyerlein, Irene J.;Mara, Nathan A.
• 通讯作者: Mara, Nathan A.

Optimizing Ohmic contacts to Nd-doped n-type SrSnO 3

优化 Nd 掺杂 n 型 SrSnO 3 的欧姆接触

• DOI: 10.1063/5.0027470
• 发表时间: 2021
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Saran Kumar Chaganti, V. R.;Golani, Prafful;Truttmann, Tristan K.;Liu, Fengdeng;Jalan, Bharat;Koester, Steven J.
• 通讯作者: Koester, Steven J.