A5079028467- Thermal Radiation and Cooling Technologies
- Advanced Thermoelectric Materials and Devices
- Metamaterials and Metasurfaces Applications
- Urban Heat Island Mitigation
- MXene and MAX Phase Materials
- Building Energy and Comfort Optimization
- Thermal properties of materials
- Advanced Sensor and Energy Harvesting Materials
- Energy Harvesting in Wireless Networks
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Graphene research and applications
- 2D Materials and Applications
- Optical properties and cooling technologies in crystalline materials
- Advanced Thermodynamics and Statistical Mechanics
- Photoacoustic and Ultrasonic Imaging
- Perfectionism, Procrastination, Anxiety Studies
- Advanced Battery Materials and Technologies
- Spectroscopy and Laser Applications
- Arctic and Antarctic ice dynamics
- Advanced Antenna and Metasurface Technologies
- nanoparticles nucleation surface interactions
- Freezing and Crystallization Processes
- Quantum Electrodynamics and Casimir Effect
Hong Kong University of Science and Technology
2021-2024
University of Hong Kong
2021-2024
Adaptive control of solar and thermal radiation through windows is pivotal importance for building energy saving. However, such synchronous passive regulations are challenging to be integrated into one thermochromic window. Here, we develop a regulatory (STR) window by integrating poly( N -isopropylacrylamide) (pNIPAm) silver nanowires (AgNWs) pNIPAm/AgNW composites. A hitherto unexplored mechanism, originating from the temperature-triggered water capture release due pNIPAm phase transition,...
Abstract Black inorganic materials with low infrared absorption/emission (or IR white) are rare in nature but highly desired numerous areas, such as solar–thermal energy harvesting, multispectral camouflage, thermal insulation, and anti‐counterfeiting. Due to the lack of spectral selectivity intrinsic materials, counter‐intuitive properties generally realized by constructing complicated subwavelength metamaterials costly nanofabrication techniques. Here, intrinsically mid‐IR emissivity (down...
Daytime radiative cooling provides an eco-friendly solution to space with zero energy consumption. Despite significant advances, most state-of-the-art coolers show broadband infrared emission low spectral selectivity, which limits their temperatures, especially in hot humid regions. Here, all-inorganic narrowband emitter comprising a solution-derived SiOx Ny layer sandwiched between reflective substrate and self-assembly monolayer of SiO2 microspheres is reported. It shows high diffusive...
There has been increasing interest in the emerging ionic thermoelectric materials with huge thermopower. However, it's challenging to selectively tune thermopower of all-solid-state polymer because transportation ions polymers is much more complex than those liquid-dominated gels. Herein, this work provides a wide tunable range (+20~-6 mV K-1), which different from previously reported Moreover, mechanism p-n conversion material at atomic scale was presented based on analysis Eastman entropy...
Textiles with radiative cooling/warming capabilities provide a green and effective solution to personal thermal comfort in different climate scenarios. However, developing multiple-mode textiles for wearing changing climates large temperature variation remains challenge. Here Janus textile is reported, comprising polyethersulfone (PES)-Al2 O3 cooling layer optically coupled Ti3 C2 Tx warming layer, which can realize sub-ambient cooling, solar warming, active Joule heating. Owing the...
Abstract The giant thermopower of ionic thermoelectric materials has attracted great attention for waste-heat recovery technologies. However, generating cyclic power by modules remains challenging, since the ions cannot travel across electrode interface. Here, we reported a reversible bipolar (+20.2 mV K −1 to −10.2 ) same composite manipulating interactions and electrodes. Meanwhile, promising generator was proposed achieve generation under constant heat course only switching external...
The giant thermopower of an ionic liquid–based ionogel can be tuned within ultrawide range by selective ion doping.
Infrared vision is highly desirable for applications in multifarious fields. Of the few species with this visual capability, snakes have exceptional infrared perception assistance of pit organs. Inspired by organ design we present here a hemispherical biomimetic imaging device. The devices use high-density ionic thermoelectric polymer nanowire arrays that serve as sensing nerve cells. individual nanowires exhibit notable voltage response to temperature variation test objects. An sensor array...
A tetrachromatic light sensor can detect in four independent color channels and extend its detection range beyond the visible spectrum. However, current sensors face challenges such as inability to work reliably extreme temperatures. In this work, we present a fully integrated tandem perovskite imaging system. Four layers of all-inorganic perovskites device serve ultraviolet, blue, green, red detectors discriminate spectral non-spectral colors. The image comprises 32 × color-selective pixel...
Abstract Real‐time control over infrared (IR) radiation of objects is highly desired in a variety areas such as personal thermal regulation and IR camouflage. This requires the dynamic modulation emissivity stepless manner wide range (>50%), which remains daunting challenge. Here, an phenomenon reported stacked 2D Ti 3 C 2 T x MXene nanosheets, from 12% to 68% intercalation/discharging water molecules within interlayers. The intercalation dynamically changes electronic properties complex...
Ion rejection during seawater freezing is the basis for freeze desalination. A high ion rate desired improving performance of In this work, we propose a method to enhance through external shear, which demonstrated molecular dynamics (MD) simulations and experiments. MD show that increases with an increasing shear rate. This attributed disruption hydration bonds between ions water molecules in shell caused by shear. Consequently, mobility increased, energy barrier reduced at ice–water...
Ionic thermoelectrics show great potential in low-grade heat harvesting and thermal sensing owing to their ultrahigh thermopower, low cost ease production. However, the lack of effective n-type ionic thermoelectric materials seriously hinders applications. Here, we report giant bidirectionally tunable thermopowers within an ultrawide range from -23 +32 mV K-1 at 90% RH solid ionic-liquid-based ionogels, rendering it among best n- p-type materials. A novel thermopower regulation strategy...
Visible transparent but infrared reflective materials are ideal candidates for both conductive films and low-emissivity glass, which highly desired in a broad variety of areas such as touchscreens displays, photovoltaics, smart windows, antistatic coatings. Ultrathin Ti3C2Tx MXene emerging promising candidates. However, the fundamental IR properties has not been revealed experimentally due to daunting challenges preparation continuous, large-area, ultrathin optical quality on flat...
Abstract Textiles with radiative cooling/warming capabilities provide a green and effective solution to personal thermal comfort in different climate scenarios. However, developing multiple-mode textiles for wearing harsh climates large temperature variation remains challenge. Here we report Janus textile comprising polyethersulfone (PES)-Al 2 O 3 cooling layer optically coupled Ti C T x warming layer, which can realize sub-ambient cooling, solar active Joule heating. Owing the intrinsically...
Abstract All-solid-state organic polymer composites are promising ionic thermoelectric (i-TE) materials, however, the transition from aqueous to gelation always sacrifices their performance, especially n-type thermopowers severely unexplored, leaving unrealized large-scale application of p-n integrated i-TE devices. Herein, we successfully developed all-solid-state PVDF-HFP/NaTFSI/PC (PhNP) with ultrahigh thermopower (Si) +20 mV K-1. The experimental and molecular simulation results detailly...
Black materials with low infrared absorption/emission (or IR white) are rare in nature but highly desired numerous areas, such as solar-thermal energy harvesting, multispectral camouflage, thermal insulation, and anti-counterfeiting. Due to the lack of spectral selectivity intrinsic materials, counter-intuitive properties generally realized by constructing complicated subwavelength metamaterials costly nanofabrication techniques. Here we report mid-IR emissivity (down 10%) 2D Ti3C2Tx MXenes....
Abstract Black materials with low infrared absorption/emission are rare in nature but highly desired numerous areas, such as solar-thermal energy harvesting, camouflage, and anti-counterfeiting. Due to the lack of spectral selectivity intrinsic materials, counter-intuitive properties generally realized by constructing complicated subwavelength artificial nanostructures precise nanofabrication techniques. Here, we report that 2D Ti3C2Tx MXenes embrace both a emissivity (down 10%) high solar...