Collaborative Research: Friction in Flatland - Contact, Adhesion, and Friction of 2D Materials

合作研究：平地摩擦 - 二维材料的接触、粘附和摩擦

基本信息

批准号：
1761874
负责人：
Robert Carpick
金额：
$ 37.4万
依托单位：
University of Pennsylvania
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-15 至 2022-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1761874&HistoricalAwards=false
关键词：
Collaborative Research Friction Flatland Contact

项目摘要

Two-dimensional materials are layered materials having atomic- to nano-scale thickness. They are increasingly being explored and used for a multitude of applications that take advantage of the materials' layered structure. However, the properties of the interfaces between the layers are still poorly understood, due in part to challenges associated with direct measurement of such properties at very small length scales. The goal of this project is to obtain a fundamental understanding of the effect of material properties, including composition, phase, and crystallinity, on the critical properties of interfacial contact, adhesion, and friction. This will have broad technological impact, since investigation of layered materials is needed to optimize and transform their use in applications that rely on these critical properties to function effectively. The focus of this research is on layered materials that are relevant to current and emerging applications, including those in the automotive, aerospace, and electronics industries, thereby promoting the progress of science; advancing the national health, prosperity, and welfare; and securing the national defense. The research objectives of this project will be complemented by activities focused on providing opportunities for students from underrepresented groups, including involving the large Hispanic population at University of California Merced and leveraging successful outreach programs at University of Pennsylvania. The team will also engage with pre-college audiences, building on the PIs' track records of public and youth engagement.This project will focus on the nanoscale interfacial contact, adhesion, and friction behavior of transition metal dichalcogenides, including molybdenum disulfide. Research on these materials will be carried out through optimally-matched atomic force microscopy and accelerated molecular dynamics simulations, taking advantage of the unique capabilities of the PIs. Optimal matching allows simulations to be validated by experiments, and experimental findings to be fully explored in atomically-resolved detail by simulations. Availability of probe tips and substrates coated with well-defined, ultrathin transition metal dichalcogenides using recently developed techniques will enable isolation of the effects of composition, phase, and crystallinity for both self-mated and heterostructure interfaces. This novel approach will yield fundamental insights into the mechanical properties of transition metal dichalcogenide interfaces that are needed for rational and predictive design of materials, devices, and systems composed of these materials.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.

二维材料是具有原子至纳米尺度厚度的分层材料。它们越来越多地被探索并用于利用材料分层结构的多种应用。但是，层之间的界面的性能仍然很少了解，部分原因是与在非常小的长度尺度下直接测量此类特性相关的挑战。该项目的目的是获得对材料特性（包括成分，相和结晶度）对界面接触，粘附和摩擦的关键特性的基本理解。这将产生广泛的技术影响，因为需要对分层材料进行调查来优化并改变其在依赖这些关键特性有效运行的应用中的使用。这项研究的重点是与当前和新兴应用有关的分层材料，包括汽车，航空航天和电子行业的材料，从而促进了科学的进步；促进民族健康，繁荣和福利；并确保国防。该项目的研究目标将由专注于为来自代表性不足的团体提供机会的活动提供补充，包括涉及加利福尼亚大学默塞德分校的大量西班牙裔人口，并利用宾夕法尼亚大学的成功外展计划。该团队还将与大学前的观众互动，这是PIS的公众和青年参与的记录。该项目将重点关注纳米级界面接触，粘附和过渡金属二分法的摩擦行为，包括二硫化钼。这些材料的研究将通过最佳匹配的原子力显微镜和加速的分子动力学模拟进行，利用PI的独特功能。最佳匹配允许通过实验验证模拟，并且可以通过模拟在原子分辨的细节中对实验发现进行验证。使用最近开发的技术涂有明确的超层型金属二分法涂层的探针尖端和底物的可用性，将有助于分离成分，相位和结晶度的自我分解和异质结构界面的影响。这种新颖的方法将产生对过渡金属二甲藻元化界面的机械性能的基本见解，这是对这些材料组成的材料，设备和系统的理性和预测设计所需的。该奖项反映了NSF的法定任务，并被认为是使用该基金会的知识分子功能和广泛影响的评估来审查CRITERIA的评估。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

A modified multibond model for nanoscale static friction

DOI：
10.1098/rsta.2021.0342
发表时间：
2022-09-19
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
影响因子：
5
作者：
Milne, Zachary B.;Hasz, Kathryn;Carpick, Robert W.
通讯作者：
Carpick, Robert W.

Experiments and simulations of the humidity dependence of friction between nanoasperities and graphite: The role of interfacial contact quality