Nanotechnology Spotlight – Latest Articles

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Showing Spotlights 1 - 8 of 2415 in category All (newest first):

 

Pufferfish inspires solar-driven water purification

pufferfishAlthough solar-driven water evaporation using sunlight is a promising sustainable strategy, the water production rate via solar technologies remains insufficient to meet practical demands. Addressing this issue, researchers have developed a solar absorber gel to purify water from contaminated sources using only natural sunlight. The hydrogel can force liquid water out of the gel via phase transition when the sun warms the material, so the water purification mechanism does not require water evaporation.

Apr 13th, 2021

An inverse-designed metalens 3D-printed on an optical fiber tip

metalensA new generation of lenses - metalenses - is starting to replace bulky curved lenses with simple, flat surfaces that use nanostructures to focus light. These flat surfaces - meatsurfaces - have enabled the design of diffraction-based flat devices to replicate the functionalities of conventional lenses with sub-wavelength or few-wavelength thicknesses. Researchers have now successfully designed and experimentally demonstrated an inverse-designed metalens to operate at a near-infrared wavelength.

Apr 8th, 2021

Observing thermal transport in carbon nanotube bundles

nanotubeIndividual single-walled carbon nanotubes (SWCNTs) have thermal conductivity that is several times higher than copper. However, once researchers start to assemble SWCNTs into macroscale composites, fibers or films, they notice that thermal conduction drops significantly. Employing in situ transmission electron microscopy, researchers visualized a colossal anisotropy of thermal conductivity of nanoscale materials. The team says that their methodology to visualize nanoscale thermal transport is not limited to carbon nanotubes.

Apr 6th, 2021

A wearable, wireless feedback sensor system to track body conditions

sensor-systemWearable flexible sensors have recently emerged as promising alternatives for human healthcare monitoring due to their lightweight and thin-film-based nature. However, few of these flexible sensor systems are applicable to neonatal monitoring, especially sleeping posture detection. Researchers now report a versatile laser-induced-graphene-based integrated sensor system, which can wirelessly monitor sleeping postures, respiration rate, and diaper wetness with feedback alarm functions.

Mar 31st, 2021

Ultrasensitive and label-free chirality detection of diabetes-related metabolic molecules

plasmonic-sensingResearchers demonstrate label-free chiral detection of metabolic molecules at picomolar level through microbubble-induced rapid accumulation of biomolecules on plasmonic chiral sensors, which shows a 10-million times enhancement in sensitivity comparing to state-of-the-art plasmonic chiral sensors. The researchers achieved their ultrahigh sensitivity in chiral sensing of biomolecules by utilizing two enhancement mechanisms: the microbubble-induced accumulation of biomolecules onto the chiral plasmonic substrates; and the subsequent plasmon-enhanced chiral sensing.

Mar 30th, 2021

Real-time sweat analysis with wearable microfluidic sensors

microfluidicsResearchers have demonstrated the large-scale fabrication of skin-interfaced printed microfluidic patches, capable of multiplexed electrochemical detection of biomarkers from human sweat. This sensor continuously and simultaneously measures the level of biomarkers such as lactate, Na+, K+, and pH during sweating. The skin-worn sensor can selectively measure analytes even in the presence of other interfering species present in sweat. The patch is integrated with a custom-made miniature printed circuit board that enables multiplexed decoding of sweat and wireless signal transduction to the host devices and is completely free from any sensor-to-sensor transfer of signals.

Mar 29th, 2021

A disposable living laser printed on chip for drug screening

laserScientists have created a new way to monitor subtle drug interactions between bacteria and antibiotics. By using a common office inkjet printer, researchers developed a disposable living laser on chip by encapsulating living bacteria inside. Strong laser emissions generated from bacteria inside the droplet will be dramatically enhanced during drug interactions. This breakthrough could enable more sensitive and high-throughput testing using micro-nano laser technology in the near future.

Mar 25th, 2021

New theory unveils obscure nonvolatile resistive switching in 2D materials

nanomaterialNonvolatile resistive memory (NVRM), also called a 'memristor', is an emerging technology that offers the possibility of in-memory computation and thus holds promise to overcome the von Neumann bottleneck. NVRM is a two-terminal device but, unlike an ordinary resistor, it exhibits hysteresis in input-output characteristics and thus can be also be used as memory. A new theory suggests that such resistive switching is an intrinsic property of a vacancy-inhabited two-dimensional materials and may not depend on the physio-chemical interactions with the electrodes.

Mar 24th, 2021