U.S. Sweden Cooperative Research: Long and Short Time Relaxation Processes and the Ion-Matrix Coupling Problem in Salt + Polymeric Solvent Systems

目标和与项目目标的相关性：这一推荐奖项将支持普渡大学的Charles A.Angell教授和瑞典哥德堡查尔默斯理工大学的L.M.Torell教授之间的合作研究。他们将继续在潜在重要的固态电化学设备介质中阐明与时间相关的过程方面的工作。具体地说，他们计划(A)在皮秒时间尺度上直接比较玻璃转变的实验和计算机模拟结果，(B)测试他们以前工作中关于某些离子液体系统中由于总结构和可移动阳离子亚结构而产生的单独和可区分的弛豫的预测，以及(C)产生第一个在玻璃固体中观察到的完整的非低温皮秒弛豫过程。此外，他们将比较盐+聚合物溶剂体系中的短期机械和电弛豫过程，并尝试将他们的工作扩展到某些液体和玻璃氧化物系统，如使用光散射方法的P2O5，以及需要高温玻璃态可压缩性数据的某些地球化学玻璃。安吉尔教授和托雷尔教授过去曾成功合作过。他们的两个实验室强调松弛时间谱的相反两端，因此他们的研究因各自不同的专业知识和设备而得到加强。他们的共同工作使得在很大范围内研究单一的松弛过程成为可能。因此，该项目有助于NSF与西欧合作的科学计划的一个重要目标，即通过将具有相似研究兴趣并希望参与互利研究合作的美国和欧洲科学家聚集在一起，促进科学进步。这项奖励的资金将支持美国首席研究员及其研究小组成员的部分交通和生活费，以及与合作直接相关的其他次要费用。提议的优点：合作的美国和外国调查人员因他们之前的研究成就而受到尊重，这项提议的研究将对科学知识做出重大贡献的前景非常好。拟议中的合作为美国调查人员提供了与领先的外国研究小组合作的机会，并使用与他们自己的设施互补的高度专业化的海外设施。工作计划合理，预算合理。安吉尔教授和托雷尔教授之前的合作卓有成效，继续共同努力获得额外互惠互利的可能性很高。资金：该奖项不会与其他资金重复。主要研究人员得到了美国国家科学基金会材料研究部、固态化学计划、批准号：DMR-8304887。这一建议的INT奖将为该研究项目增加一个重要的国际层面提供资金。首席研究员从能源部获得了国内研究方面的其他支持。

Objectives and Relevance to Program Objectives: This recommended award would support collaborative research between Professor Charles A. Angell, Purdue University, and Professor L.M. Torell, Chalmers University of Technology, Gothenburg, Sweden. They will continue their work on the elucidation of time-dependent processes in potentially important solid state electrochemical device media. Specifically, they plan to (a) make direct comparisons of experimental and computer simulation results of glass transitions on picosecond time scales, (b) test predictions from their former work about separate and distinguishable relaxations due to total structure and mobile cation substructure in certain ionic liquid systems, and (c) produce the first complete non-cryogenic picosecond relaxation process observed in a glassy solid. Additionally, they will compare short-time mechanical and electrical relaxation processes in salt + polymeric solvent systems, and they will try to extend their work to certain liquid and glassy oxide systems, such as P2O5, using light-scattering methods, and to certain geochemical glasses for which high temperature glassy state compressibility data are needed. Professors Angell and Torell have successfully worked together in the past. Their two laboratories emphasize opposite ends of the relaxation time spectrum, so their research is strengthened by the different expertise and equipment of each setting. Their joint work has permitted research on single relaxation processes over a large range of times. The project thus contributes to an important objective of NSF's cooperative science programs with Western Europe, which is to stimulate scientific progress by bringing together scientists from the U.S. and Europe who have similar research interests and who wish to engage in mutually beneficial research cooperation. Funds from this award would support partial transportation and subsistence expenses for the U.S. principal investigator and members of his research group, as well as other minor costs directly related to the collaboration. Merit of Proposal: The cooperating U.S. and foreign investigators are respected for their previous research accomplishments, and there is a very good prospect that this proposed research will lead to a significant contribution to scientific knowledge. The proposed cooperation presents the U.S. investigators with the opportunity to work with a leading foreign research group and to use highly specialized facilities abroad that are complementary to their own. The work plan is sound and the budget is reasonable. Previous collaboration between Professors Angell and Torell has been productive, and the likelihood of additional mutual benefit from a continuation of the joint effort is high. Funding: This award will not duplicate other funding. The principal investigator receives project support from NSF's Division of Materials Research, Solid State Chemistry Program, Grant No. DMR-8304887. This recommended INT award would fund the addition of an important international dimension to that research project. The principal investigator receives other support for the domestic aspects of his research from the Department of Energy.