A5003164074- Advanced Thermoelectric Materials and Devices
- Heat Transfer and Optimization
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Heat Transfer Mechanisms
- Mechanical and Optical Resonators
- Model Reduction and Neural Networks
- Heat Transfer and Boiling Studies
- Photonic and Optical Devices
- Advanced Thermodynamics and Statistical Mechanics
- Force Microscopy Techniques and Applications
- ZnO doping and properties
- Ferroelectric and Piezoelectric Materials
- Electronic and Structural Properties of Oxides
- Additive Manufacturing and 3D Printing Technologies
- Fluid Dynamics and Turbulent Flows
- Innovative Energy Harvesting Technologies
- Ga2O3 and related materials
- Advanced Multi-Objective Optimization Algorithms
- Composite Material Mechanics
- Ferroelectric and Negative Capacitance Devices
- Meteorological Phenomena and Simulations
- Dielectric materials and actuators
- Plasma and Flow Control in Aerodynamics
- Refrigeration and Air Conditioning Technologies
Arizona State University
2018-2024
Korea Institute of Science and Technology
2014-2022
Ulsan National Institute of Science and Technology
2021
University of Illinois Urbana-Champaign
2010-2020
Chungbuk National University
2002-2003
Output power of thermoelectric generators depends on device engineering minimizing heat loss as well inherent material properties. However, the has been largely neglected due to limited flat or angular shape devices. Considering that surface most sources where these planar devices are attached is curved, a considerable amount inevitable. To address this issue, here, we present shape-engineerable painting, geometrically compatible surfaces any shape. We prepared Bi2Te3-based inorganic paints...
Abstract Thermoelectric power generation offers a promising way to recover waste heat. The geometrical design of thermoelectric legs in modules is important ensure sustainable but cannot be easily achieved by traditional fabrication processes. Herein, we propose the cellular architectures for efficient and durable generation, realized extrusion-based 3D printing process Cu 2 Se materials. We optimum aspect ratio cuboid leg maximize output extend this mechanically stiff hollow hexagonal...
This article reports the design, fabrication, and demonstration of additively manufactured air jet impingement coolers for thermal management high-power gallium nitride (GaN) transistors. The polymer impinge high-speed airflow with a velocity 42-195 m/s (Reynolds number between 1.87×104 8.77×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> ) onto working GaN devices mounted on printed circuit board (PCB). provides cooling heat fluxes...
Interfaces, such as grain boundaries in a solid material, are excellent regions to explore novel properties that emerge the result of local symmetry-breaking. For instance, at interface layered-chalcogenide potential reconfiguration atoms can lead significant modification electronic because their complex atomic bonding structure. Here, we report experimental observation an electron source 60° twin Bi2Te3, representative material. First-principles calculations reveal interatomic distance...
Composite phase change materials consisting of a high-latent-heat material (PCM) embedded in high-thermal-conductivity matrix are desirable for thermally buffering pulsed heat loads via rapid absorption and release thermal energy at constant temperature. This paper reports composite PCM buffer Field's metal having high volumetric latent (315 MJ/m3) copper (Cu) intrinsic conductivity [384 W/(m·K)]. We demonstrate samples fabricated with Cu volume fractions from 0.05 to 0.2 sample thicknesses...
Atomic force microscope (AFM) cantilevers with integrated heaters enable nanometer-scale heat flow measurements, materials characterization, nanomanufacturing, and many other applications. When a heated AFM cantilever tip is in contact substrate, the interface hotspot whose temperature can be controlled over large range. Over past decade, there has been significant improvements understanding of flows within from an cantilever. There have also characterization calibration these cantilevers....
Devices capable of actively controlling heat flow have been desired by the thermal management community for decades. The need control has become particularly urgent with power densification resulting in devices localized fluxes as high 1 kW/cm2. Thermal switches, modulating between and low conductances, enable partitioning active pathways. This paper reports a millimeter-scale switch switching ratio &gt;70, at near 10 W/cm2. device consists silicone channel filled reducing liquid or...
Large discrepancies between well-mixed reaction rates and effective reactions estimated under fluid flow conditions have been a major issue for predicting reactive transport in porous media systems. In this study, we introduce framework that accurately predicts directly from pore structural features by combining 3D pore-scale numerical simulations with machine learning (ML). We first perform fluid-solid hundreds of calculate concentration fields. then train Random Forests model 11 to...
Heat dissipation is a key obstacle to achieving reliable, high-power-density electronic systems. Thermal devices capable of actively managing heat transfer are desired enable optimization and enhanced reliability through device isothermalization. Here, we develop millimeter-scale liquid metal droplet thermal switch controlling spatially temporally. We demonstrate the by integrating it with gallium nitride (GaN) mounted on printed circuit board (PCB) measure temperature each for variety...
A critical challenge in using thermoelectric generators (TEGs) for charging the portable or wearable electronics has been their limited outputs, as available temperature differential on human body (∆ T ext ) is typically less than 10 K. Furthermore, thermal resistance ( R th at TEG–air interface often overwhelms of TEG itself, which makes within merely a small fraction ∆ . Here, designs systems applications based both theory and systematic experiments are studied. First, this study...
Abstract Anisotropic polymer/nanoparticle composites display unique mechanical, thermal, electrical, and optical properties depending on confirmation configuration control of the composing elements. Processes, such as vapor deposition, ice‐templating, nanoparticle self‐assembly, additive manufacturing, or layer‐by‐layer casting, are explored to design microstructures with desired anisotropy isotropy. However, limited attempts made toward patterning during continuous fiber spinning due...
Harman method is a rapid and simple technique to measure thermoelectric properties. However, its validity has been often questioned due the over-simplified assumptions that this relies on. Here, we quantitatively investigate influence of previously ignored parasitic thermal effects on develop determine an intrinsic ZT. We expand original relation with three extra terms: heat losses via both lead wires radiation, Joule heating within sample. Based expanded relation, use differential...