CityU researchers invent smart mask to track respiratory sounds for respiratory disease identification

Wearing face masks has been recognised as one of the most effective ways to prevent the spread of COVID-19, even in its coming endemic phase. Apart from the conventional function of masks, the potential for smart masks to monitor human physiological signals is being increasingly explored. A research team led by the City University of Hong Kong (CityU) recently invented a smart mask, integrating an ultrathin nanocomposite sponge structure-based soundwave sensor, which is capable of detecting respiratory sounds of breathing, coughing and speaking.

 

CityU materials scientists find a new way to create thermally stable high-entropy alloys

Nanoparticles have been used to develop high-strength materials for structural applications. But these nanoparticles are often thermally unstable, leading to rapid coarsening in a high-temperature environment. The latest research led by materials scientists at City University of Hong Kong (CityU) found that tailoring the concentration of cobalt in high entropy alloys (also called chemically complex alloys) can prevent nanoparticles from rapid coarsening at high temperatures.

A novel, space-time coding antenna developed at CityU promotes 6G and secure wireless communications

A research team co-led by a scientist at City University of Hong Kong (CityU) has developed a novel antenna that allows manipulation of the direction, frequency and amplitude of the radiated beam, and is expected to play an important role in the integration of sensing and communications (ISAC) for 6th-generation (6G) wireless communications. 

CityU researchers develop wireless, ultrathin “Skin VR” to provide a vivid, “personalised” touch experience in the virtual world

Enhancing the virtual experience with the touch sensation has become a hot topic, but today’s haptic devices remain typically bulky and tangled with wires. A team led by the City University of Hong Kong (CityU) researchers recently developed an advanced wireless haptic interface system, called WeTac, worn on the hand, which has soft, ultrathin soft features, and collects personalised tactile sensation data to provide a vivid touch experience in the metaverse.

CityU scientists discover a novel photophysical mechanism that has achieved record-breaking efficiency for organic photovoltaics

Organic photovoltaics (OPVs) are a promising, economical, next-generation solar cell technology for scalable clean energy and wearable electronics. But the energy conversion loss due to the recombination of photogenerated charge carriers in OPVs has hindered further enhancement of their power conversion efficiency (PCE). Recently, researchers from City University of Hong Kong (CityU) overcame this obstacle by inventing a novel device-engineering strategy to successfully suppress the energy conversion loss, resulting in record-breaking efficiency.

Converting temperature fluctuations into clean energy with novel nanoparticles and heating strategy

Pyroelectric catalysis (pyro-catalysis) can convert environmental temperature fluctuations into clean chemical energy, like hydrogen. However, compared with the more common catalysis strategy, such as photocatalysis, pyro-catalysis is inefficient due to slow temperature changes in the ambient environment.

CityU unravels interfacial interactions of the lead-free perovskite for efficient hydrogen production

The conversion of solar energy into hydrogen energy represents a promising and green technique for addressing the energy shortage and reducing fossil fuel emissions. A research team from City University of Hong Kong (CityU) recently developed a lead-free perovskite photocatalyst that delivers highly efficient solar energy-to-hydrogen conversion.

CityU researchers invented a novel device enabling high-resolution observation of liquid phase dynamic processes at nanoscale

In situ observation and recording of important liquid-phase electrochemical reactions in energy devices is crucial for the advancement of energy science. A research team led by a scholar from City University of Hong Kong (CityU) recently developed a novel, tiny device to hold liquid specimens for transmission electron microscopy (TEM) observation, opening the door to directly visualizing and recording complex electrochemical reactions at nanoscale in real-time at high resolution.

CityU scientists engineer a breath-to-charge electrostatic face mask for prolonged air filtration, reducing the environmental burden

Electrostatic adsorption is an important complement to mechanical filtration for high-efficiency air filtering in the use of face masks. However, the electrostatic charge of the filters decays over time, particularly in humid conditions. A research team at City University of Hong Kong (CityU) successfully engineered a breath-to-charge electrostatic face mask that can “self-charge” through the user’s breathing and continuously replenish its electrostatic charge as the user wears and breathes through the mask.

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