Ultrafast Sensing of Nanoscale Thermomechanical Energy Transfer Mechanisms Among of Various Phases or Matter
Abstract
Abstract Ultrafast sensing of interfacial thermomechanical nanoscale energy transfer mechanisms among of various phases of matter Patrick E. Hopkins Assistant Professor Department of Mechanical and Aerospace Engineering University of Virginia phopkins@virginia.edu The thermomechanics of phase change and the coupling between various states of matter at surfaces and boundaries govern how atoms and molecules exchange energy across interfaces. These are the driving factors behind the nanoscopic mechanisms that limit an array of processes and applications of great interest to civilian and military-based technologies that will shape the future of the Office of Naval Research, Department of Defense, and the United States of America. While these nanoscopic thermomechanical energy coupling mechanisms are critical to various processes and applications, direct measurements of the rate of thermal exchange between the phases of matter that drive and limit these processes at planar interfaces are not trivial. In response, the overarching goal of this work is to develop novel experimental capabilities that will enable highly precise measurements of the coupling between various thermomechanical energetic dissipation and thermal transport mechanisms at solid surfaces and interfaces during a change in phase of the local medium. This proposed work, which will center around ultrafast laser spectroscopy supported by molecule dynamics simulations, will provide direct measurements of the following four thermophysical processes involving material phase change at surfaces: i) energetic mechanisms driving atomic diffusion and chemical reactions in solids during solid-state material modification; ii) thermal transport across nanoscale layers of liquid films confined near solid surfaces with different densities than the bulk liquids; iii) energy of a liquid phase change on a solid surface, and resulting heat transport to/from the solid; iv) energies of molecular adsorbates on patterned surfaces, and the role that these adsorbates have on thermomechanical energy transport at interfaces.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512769
Entities
People
- Patrick E Hopkins
Organizations
- Office of Naval Research
- United States Navy
- University of Virginia