A5045070349- Advanced Sensor and Energy Harvesting Materials
- Thermal properties of materials
- Phase Change Materials Research
- Heat Transfer and Optimization
- Thermal Radiation and Cooling Technologies
- Advanced Thermoelectric Materials and Devices
- Silicon Carbide Semiconductor Technologies
- Heat Transfer Mechanisms
- Solar-Powered Water Purification Methods
- Electric Motor Design and Analysis
- Solar Thermal and Photovoltaic Systems
- Additive Manufacturing and 3D Printing Technologies
- Magnetic Properties and Applications
- Transition Metal Oxide Nanomaterials
- Dielectric materials and actuators
- Electrical Fault Detection and Protection
- Plasma and Flow Control in Aerodynamics
- Innovative Energy Harvesting Technologies
- Neuroscience and Neural Engineering
- Optical Imaging and Spectroscopy Techniques
- Power Transformer Diagnostics and Insulation
- High voltage insulation and dielectric phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Polymer composites and self-healing
- Electronic Packaging and Soldering Technologies
Northwestern University
2023-2025
University of Illinois Urbana-Champaign
2018-2023
Shanghai Electric Cable Research Institute
2023
Northwestern Polytechnical University
2022
Phase change materials (PCMs) having a large latent heat during solid-liquid phase transition are promising for thermal energy storage applications. However, the relatively low conductivity of majority PCMs (<10 W/(m ⋅ K)) limits power density and overall efficiency. Developing pure or composite with high capacity cooling power, engineering effective devices, optimizing system integration have long been desired. Our perspective outlines needs better understanding multi-physics phenomena,...
Thermal sensations contribute to our ability perceive and explore the physical world. Reproducing these in a spatiotemporally programmable manner through wireless computer control could enhance virtual experiences beyond those supported by video, audio and, increasingly, haptic inputs. Flexible, lightweight thin devices that deliver patterns of thermal stimulation across large areas skin at any location body are great interest this context. Applications range from gaming remote...
Abstract Soft, wireless physiological sensors that gently adhere to the skin are capable of continuous clinical-grade health monitoring in hospital and/or home settings, particular value critically ill infants and other vulnerable patients, but they present risks for injury upon thermal failure. This paper introduces an active materials approach automatically minimizes such risks, complement traditional schemes rely on integrated electronic control circuits. The strategy exploits thin,...
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...
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...
Abstract Many recently developed classes of wireless, skin‐interfaced bioelectronic devices rely on conventional thermoset silicone elastomer materials, such as poly(dimethylsiloxane) (PDMS), soft encapsulating structures around collections electronic components, radio frequency antennas and, commonly, rechargeable batteries. In optimized layouts and device designs, these materials provide attractive features, most prominently in their gentle, noninvasive interfaces to the skin even at...
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...
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...
Analogous to an electrical rectifier, a thermal rectifier (TR) can ensure that heat flows in preferential direction. In this paper, transport nonlinearity is achieved through the development of phase-change based TR comprising enclosed vapor chamber having separated nanostructured copper oxide superhydrophobic and superhydrophilic functional surfaces. forward direction, transfer facilitated evaporation on surface self-propelled jumping-droplet condensation surface. reverse minimized due...
Litz wire has been widely used in high-frequency electrical machines and transformers to minimize induced current loss maintain high efficiency. Its heat dissipation capability can be a key design factor for high-power-density, machines. Although litz equivalent thermal conductivity studied, its transposition arrangement on enhancement is usually neglected. This article focuses developing an analytical model predict including effects. 3-D finite element models hardware experiments are...
Litz wire has been widely used in high-frequency electrical machines and transformers to minimize induced current loss maintain high efficiency. Its heat dissipation capability can be a key design factor for high-power-density machine power electronics. Although litz equivalent thermal conductivity studied, its transposition effect is usually ignored. This paper focus on developing an analytical model predict considering bundle effects. A 3-D modeled simulated validate results. Also,...
Power module heat dissipation with spatial inhomogeneity and induced nonuniform temperature distribution presents a challenging concern for system reliability due to thermo-mechanical stresses. These challenges are especially important nonplanar designs using 3-D packaging principles. Here, we develop spreader thermal switch capable of actively reducing gradients between silicon carbide (SiC) devices in three-level T-type power converter, which can change depending on electronic operating...
We report an air jet cooler made with additive manufacturing. The directs impinging directly onto electronic devices. system was fabricated by a single manufacturing process using resin-based three-dimensional printer, and monolithically integrates two nozzles, delivery channel, flow distributor mechanical fixtures within volume of 80×80×80 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> , To demonstrate the viability cooler, high...
Wireless Wearables In article number 2302256, John A. Rogers, Ralph G. Nuzzo, Yonggang Huang, and co-workers report a miniaturized, wireless mechanoacoustic sensor, encapsulated with self-healing, dynamic covalent elastomer, embedded chemistries that provide colorimetric responses, strain-adaptive stiffening, thermal insulation properties relevant to the safety of wireless, skin-interfaced bioelectronic device use operation. These multifunctional materials design strategies can immediately...
As a nondestructive testing technique, the isothermal relaxation current (IRC) method has been applied to assess condition of power cable insulation. In order shorten detection time in field and improve measurement accuracy, modified circuit based on an independent loop was proposed discharge interference from high-voltage insulated wires. Based this circuit, three-phase synchronous IRC system established. Furthermore, independence consistency were verified, which could realize acquisition...