Investigation of Vapor-deposited Glasses by Nanocalorimetry and Dielectric Relaxation

通过纳米量热法和介电弛豫研究气相沉积玻璃

• 批准号: 1564663
• 负责人: Mark Ediger
• 金额: $ 50.4万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1564663&HistoricalAwards=false
• 关键词: Investigation; Vapor; deposited; Glasses; Nanocalorimetry

In this project funded by the Chemical Structure, Dynamics and Mechanisms program of the Chemistry Division, Professors Mark Ediger (University of Wisconsin-Madison) and Ranko Richert (Arizona State University) are studying organic glasses prepared by deposition from the gas phase. Glasses play an important role in modern technology. For example, many cell phone displays are organic light emitting diodes and organic glasses are the active layers in these devices. This project seeks to determine properties of glasses and this fundamental understanding may enable the production of improved glasses that are useful in applications. This project characterizes the properties of vapor-deposited glasses using nanocalorimetry and dielectric relaxation. Recent work has established that vapor-deposited glasses can exhibit very high kinetic stability and other unexpected properties. The researchers study the extent to which secondary relaxation processes in vapor-deposited glasses are suppressed as a sensitive indication of the perfection of packing in the glass. Deposition in the presence of a large electric field is being tested as a means of preparing glasses with even higher kinetic stability. In addition, the project seeks to understand why some organic molecules do not form highly stable glasses when vapor-deposited. The training of graduate, undergraduate, and high school students is being advanced through the integration of chemistry research and education activities. Each summer an educational outreach program is presented to high school juniors, most of whom are from groups that are underrepresented in engineering and science, to develop interest in science/engineering and skills required for success in college.

在这个由化学部化学结构、动力学和机制项目资助的项目中，Mark Ediger教授（威斯康星大学麦迪逊分校）和Ranko里切特教授（亚利桑那州立大学）正在研究通过气相沉积制备的有机玻璃。眼镜在现代技术中扮演着重要的角色。 例如，许多手机显示器是有机发光二极管，有机玻璃是这些器件中的有源层。该项目旨在确定玻璃的性质，这种基本的理解可能使生产在应用中有用的改进玻璃成为可能。该项目使用纳米量热法和介电弛豫来表征气相沉积玻璃的性质。最近的工作已经确定，气相沉积玻璃可以表现出非常高的动力学稳定性和其他意想不到的性能。研究人员研究了气相沉积玻璃中二次弛豫过程被抑制的程度，作为玻璃中包装完美性的敏感指标。 在大电场存在下的沉积作为制备具有更高动力学稳定性的玻璃的一种手段正在进行测试。此外，该项目还试图了解为什么一些有机分子在气相沉积时不能形成高度稳定的玻璃。通过化学研究和教育活动的整合，正在推进研究生、本科生和高中生的培训。每年夏天，一个教育推广计划是呈现给高中三年级学生，其中大多数是来自在工程和科学代表性不足的群体，以发展在科学/工程的兴趣和在大学取得成功所需的技能。

项目成果

Dielectric properties of vapor-deposited propylbenzenes

气相沉积丙苯的介电性能

• DOI: 10.1063/1.5125138
• 发表时间: 2019
• 期刊: The Journal of Chemical Physics
• 作者: Riechers, Birte;Guiseppi-Elie, A.;Ediger, M. D.;Richert, Ranko
• 通讯作者: Richert, Ranko

Relationship between aged and vapor-deposited organic glasses: Secondary relaxations in methyl- m -toluate

老化和气相沉积有机玻璃之间的关系：间甲苯甲酸甲酯的二次弛豫

• DOI: 10.1063/1.5123305
• 发表时间: 2019
• 期刊: The Journal of Chemical Physics
• 作者: Kasting, B. J.;Beasley, M. S.;Guiseppi-Elie, A.;Richert, R.;Ediger, M. D.
• 通讯作者: Ediger, M. D.