Renkun Chen
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View article: Entering the Strong Coupling Regime in Conventional Organic Solar Cells
Entering the Strong Coupling Regime in Conventional Organic Solar Cells Open
Organic solar cells offer a promising method to convert light into fossil‐free energy, yet their performance still cannot compete with their silicon counterparts. Recently, strong exciton‐photon coupling has been shown to enhance the prope…
View article: Thermoelectrically Elevated Hydrogel Evaporation for Personal Cooling under Extreme Heat Stress
Thermoelectrically Elevated Hydrogel Evaporation for Personal Cooling under Extreme Heat Stress Open
Extreme heat events with wet-bulb temperatures (WBT) above 35°C pose serious risks to human survival, and conventional hydrogel evaporative cooling alone may not provide sufficient relief as it must be maintained at a sufficiently high tem…
View article: Low Thermal Conductivity and Diffusivity at High Temperatures Using Stable High‐Entropy Spinel Oxide Nanoparticles
Low Thermal Conductivity and Diffusivity at High Temperatures Using Stable High‐Entropy Spinel Oxide Nanoparticles Open
The realization of low thermal conductivity at high temperatures (0.11 W m −1 K −1 800 °C) in ambient air in a porous solid thermal insulation material, using stable packed nanoparticles of high‐entropy spinel oxide with 8 cations (HESO‐8 …
View article: Flexible Thermoelectric Active Cooling Garment to Combat Extreme Heat
Flexible Thermoelectric Active Cooling Garment to Combat Extreme Heat Open
With the increasing frequency, intensity, and duration of extreme heat events due to climate change, heat‐related diseases or even mortality have become more prevalent. An efficient personal cooling strategy can mitigate heat stress by reg…
View article: Flexible Thermoelectric Active Cooling Garment to Combat Extreme Heat
Flexible Thermoelectric Active Cooling Garment to Combat Extreme Heat Open
With the increasing frequency, intensity, and duration of extreme heat events due to climate change, heat-related diseases or even mortality have become more prevalent. An efficient personal cooling strategy can mitigate heat stress by reg…
View article: Probing Thermal Transport in Fluidized Bed Using Modulated Photothermal Radiometry
Probing Thermal Transport in Fluidized Bed Using Modulated Photothermal Radiometry Open
In concentrated solar power (CSP) applications, fluidized bed is a promising approach for high heat transfer coefficient (HTC) solar receivers and heat exchangers. However, the complexity of multiphase mixing has made it difficult to chara…
View article: <i>In situ</i> thermal conductivity measurement revealing kinetics of thermochemical reactions
<i>In situ</i> thermal conductivity measurement revealing kinetics of thermochemical reactions Open
Utilizing thermochemical reactions for thermal energy storage and solar fuel production has been an emerging research topic. Thermal transport properties of the materials are an important parameter that can determine the kinetics and effic…
View article: Fluorite-pyrochlore-weberite phase transitions in a series of 20-component ultrahigh-entropy compositionally complex ceramics
Fluorite-pyrochlore-weberite phase transitions in a series of 20-component ultrahigh-entropy compositionally complex ceramics Open
A new series of 20-component fluorite-based compositionally complex oxides (20CCFBOxNb/Ta) with the general chemical formula (15RE1/15)2x+1(Ce1/3Zr1/3Hf1/3)3-3x(Nb1/2Ta1/2)xO8-δ (0 ≤ x ≤ 1, where 15RE1/15 = La1/15Pr1/15Nd1/15Sm1/15Eu1/15Gd…
View article: A wirelessly programmable, skin-integrated thermo-haptic stimulator system for virtual reality
A wirelessly programmable, skin-integrated thermo-haptic stimulator system for virtual reality Open
Sensations of heat and touch produced by receptors in the skin are of essential importance for perceptions of the physical environment, with a particularly powerful role in interpersonal interactions. Advances in technologies for replicati…
View article: Micromechanical origin of heat transfer to granular flow
Micromechanical origin of heat transfer to granular flow Open
Heat transfer across a granular flow is comprised of two resistances in series : near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contri…
View article: Heat Transfer Coefficients of Moving Particle Beds from Flow-Dependent Particle Bed Thermal Conductivity and Near-Wall Resistance
Heat Transfer Coefficients of Moving Particle Beds from Flow-Dependent Particle Bed Thermal Conductivity and Near-Wall Resistance Open
Determination of heat transfer coefficients for flowing packed particle beds is essential to the design of particle heat exchangers, and other thermal processes. While such dense granular flows fall into the well-known plug-flow regime, th…
View article: Super-adsorbing porous thermo-responsive desiccants
Super-adsorbing porous thermo-responsive desiccants Open
Thermo-responsive hydrogel composite (TRHC) desiccants having high adsorption capacities, fast adsorption/desorption rates, and low regeneration temperatures (Treg) compared to traditional desiccants. TRHC desiccants may be synthesized by …
View article: Non-contact Thermophysical Characterization of Solids and Fluids for Gen3 Concentrating Solar Power
Non-contact Thermophysical Characterization of Solids and Fluids for Gen3 Concentrating Solar Power Open
In this project, we aim to develop Modulation Photothermal Radiometry (MPR), which is an attractive non-contact tool to evaluate thermophysical properties of high-temperature solids and HTFs that are otherwise time-consuming and difficult …
View article: Magnetocaloric alloys useful for magnetic refrigeration applications
Magnetocaloric alloys useful for magnetic refrigeration applications Open
This invention relates to magnetocaloric materials comprising alloys useful for magnetic refrigeration applications. In some embodiments, the disclosed alloys may be Cerium, Neodymium, and/or Gadolinium based compositions that are fairly i…
View article: Low-dimensional heat conduction in surface phonon polariton waveguide
Low-dimensional heat conduction in surface phonon polariton waveguide Open
Heat conduction in solids is typically governed by the Fourier’s law describing a diffusion process due to the short wavelength and mean free path for phonons and electrons. Surface phonon polaritons couple thermal photons and optical phon…
View article: Micromechanical Origin of Heat Transfer to Granular Flow
Micromechanical Origin of Heat Transfer to Granular Flow Open
Heat transfer to a granular flow is comprised of two resistances in series: near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contributio…
View article: In-situ Thermophysical Measurement of Flowing Molten Chloride Salt Using Modulated Photothermal Radiometry
In-situ Thermophysical Measurement of Flowing Molten Chloride Salt Using Modulated Photothermal Radiometry Open
Molten salts are a leading candidate for high-temperature heat transfer fluids (HTFs) for thermal energy storage and conversion systems in concentrated solar power (CSP) and nuclear energy power plants. The ability to probe molten salt the…
View article: Thermal Conductivity Measurement Using Modulated Photothermal Radiometry for Nitrate and Chloride Molten Salts
Thermal Conductivity Measurement Using Modulated Photothermal Radiometry for Nitrate and Chloride Molten Salts Open
Molten salts are being used or explored for thermal energy storage and conversion systems in concentrating solar power and nuclear power plants. Thermal conductivity of molten salts is an important thermophysical property dictating the per…
View article: Grain boundary-limited thermal transport in suspended thin graphite across an unexplored thickness regime
Grain boundary-limited thermal transport in suspended thin graphite across an unexplored thickness regime Open
We present systematic thermal conductivity measurements of suspended thin graphite ribbons, 234-527 nm thick, using a four-probe 3-omega method. Unlike recent reports of phonon hydrodynamics and exceptionally high thermal conductivity in m…