权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Link between Temperature-Dependent Elasticity and Viscosity of Glass-forming Liquids

玻璃形成液体的温度依赖性弹性和粘度之间的联系

基本信息

批准号：
1508410
负责人：
Liping Huang
金额：
$ 61.21万
依托单位：
Rensselaer Polytechnic Institute
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-08-15 至 2022-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1508410&HistoricalAwards=false
关键词：
Link between Temperature Dependent Elasticity

项目摘要

NON-TECHNICAL DESCRIPTION: Despite the enormous importance in areas such as processing control in the glass industry, and understanding the geological processes in the Earth interior, very little is known why the viscosity of a glass-forming liquid rises dramatically as it is cooled toward the glass transition. This project addresses this issue by synergistically combining in situ experimental and advanced computational approaches to provide a structural understanding of viscosity of glass-forming liquids through the link to the high temperature elasticity. Understanding the atomic processes involved in the viscous flow process is of critical importance for developing glasses with vastly different chemistries that are increasingly demanded for applications such as personal electronics, automobiles, solar panels, buildings, and submarine communications cables. The integrated educational effort introduces an undergraduate level computational materials science course into the Materials Science and Engineering curriculum. This course is making students aware of the importance of computational techniques to the future of science and technology, and is training the next generation of workforce with the capabilities to utilize computational tools for materials design and testing. Continuous efforts are being made to inspire and encourage K-12 students to pursue science and engineering as a career path, by igniting curiosity in young minds and instilling confidence in women and underrepresented minorities.TECHNICAL DETAILS: The structural origin of the non-Arrhenius temperature dependence of viscosity of glass-forming liquids remains elusive and constitutes an important, but unsolved problem in condensed matter physics. Consequently, processing control in glass industry is largely empirical, and understanding the geophysical processes in the interior of the Earth is hindered. The poor structural understanding of viscosity is mainly due to the lack of in situ analysis of the microscopic events during the viscous flow process. It has become increasingly clear in recent years that high temperature elasticity and viscosity of glass-forming liquids are strongly correlated; however, temperature-dependent elastic moduli, especially the shear modulus, of supercooled liquids are scarcely available due to the experimental difficulties. This research bridges this gap by using in situ Brillouin light scattering technique to measure high temperature elastic moduli of a wide range of supercooled glass-forming liquids spanning the full breadth of strong and fragile glass-formers. Complementary computational study aims to illustrate the structural developments above the glass transition temperature that gives rise to the strong correlation between the temperature-dependent elasticity and viscosity of glass-forming liquids. Understanding the viscous flow of glass-forming liquids at the atomic scale will shed light on the glass transition, and help reveal magmatic processes such as magma generation and transport and evolution of igneous rocks.

非技术描述：尽管在玻璃工业的加工控制和了解地球内部的地质过程等领域具有巨大的重要性，但很少有人知道为什么玻璃形成液体的粘度在冷却到玻璃转变时急剧上升。该项目通过将现场实验和先进的计算方法协同结合，通过与高温弹性的联系，提供对玻璃形成液体粘度的结构理解，从而解决了这一问题。了解粘性流动过程中涉及的原子过程对于开发具有不同化学成分的玻璃至关重要，这些化学成分在个人电子产品，汽车，太阳能电池板，建筑物和海底通信电缆等应用中需求日益增加。综合教育努力在材料科学与工程课程中引入了本科水平的计算材料科学课程。本课程使学生意识到计算技术对未来科学技术的重要性，并培养下一代具有利用计算工具进行材料设计和测试的能力的劳动力。通过激发年轻人的好奇心，培养对女性和少数族裔的信心，不断努力激励和鼓励K-12学生将科学和工程作为职业道路。技术细节：玻璃形成液体粘度的非阿伦尼乌斯温度依赖性的结构起源仍然难以捉摸，并且构成了凝聚态物理中重要但未解决的问题。因此，玻璃工业的加工控制在很大程度上是经验的，对地球内部地球物理过程的理解受到阻碍。对黏性的结构理解较差主要是由于缺乏对黏性流动过程中微观事件的现场分析。近年来，人们越来越清楚地认识到，玻璃形成液的高温弹性与粘度之间存在很强的相关性；然而，由于实验上的困难，温度相关的弹性模量，特别是剪切模量，很少能得到。本研究通过使用原位布里渊光散射技术来测量各种过冷玻璃形成液体的高温弹性模量，从而弥补了这一空白，这些液体跨越了强玻璃和易碎玻璃形成物的全部宽度。补充计算研究旨在说明玻璃化转变温度以上的结构发展，这导致玻璃化液体的温度依赖弹性和粘度之间的强相关性。在原子尺度上理解玻璃化液体的黏性流动将有助于揭示玻璃化转变，并有助于揭示岩浆的产生、运输和火成岩演化等岩浆过程。