Nanotechnology Spotlights

Appearance and origin of oxidation in 2D nanomaterials akin to tree rings

tree-ringsMany 2D materials with atomic-scale thicknesses suffer from oxidation and degradation effects under ambient conditions, which is one of the biggest obstacles in their practical applications. A 75-month study used atomic force microscopy to investigate the long-term evolution of oxidative defects on transition metal dichalcogenides (TMDs). Intriguingly, the researchers found that long-term storage in ambient conditions led...

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Engineering of Pd-single-atom coordinated biocatalysts for chem-/sono-/photo-trimodal tumor therapies

biocatalystThe diversity, complexity, and heterogeneity of malignant tumor seriously undermine the efficiency of mono-modal treatment. Recently, multi-modal therapeutics with enhanced antitumor efficiencies have attracted increasing attention. However, designing a nanotherapeutic platform with uniform morphology in nanoscale that integrates with efficient chem-/sono-/photo-trimodal tumor therapies is still a great challenge. Reseaerchers...

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Calligraphy at the nanoscale

nanocalligraphyScanning probe lithography techniques rely on the use of cantilevers to pattern sub-100 nm structures generated by the mechanical contact between a cantilever tip and a surface. SPL, with its high resolution, is a popular method for prototyping nanoscale structures. Overcoming the current limitations of SPL - the lack of high-resolution, high-speed throughput at low cost - researchers developed a new technique they termed...

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Energetic ferroelectrics

electricity-generationResearchers demonstrated that two dissimilar materials - molecular energetic materials and ferroelectrics - can be combined to obtain a chemically driven electrical energy source with high-power density. They obtained chemically driven electrical energy with a high specific power of 1.8 kW/kg and achieve an estimated detonation velocity comparable to trinitrotoluene (TNT) and hexanitrostilbene (HNS). Such a power source could...

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Spiky rose thorns inspire nanoengineered antiviral herpes treatment

spikey-nanoparticlesResearchers have developed an antiviral dressing material with visible-light-activated sterilizing properties that enables physical and chemical protection against viral agents like Herpes simplex. They re-engineered a common additive agent found in sunscreen (zinc oxide) to be self-sterilizing within a non-woven fibrous mats for herpes virus treatment. The self-sterilizing function creates a 'green' associated oxidant hydrogen...

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Living optical fibers expand the use of photonics for bioengineering

optical-fiberAn interdisciplinary approach that integrates optics, bioengineering, and nanotechnology has led to the fabrication of a living optical hydrogel fiber with many applications, including cancer models, physical force sensing, and covid detection, among others. This work represents a simple and low-cost approach to fabricating optical fibers made from biological materials. These fibers can be easily modified for specific applications...

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New strategy achieves electric insulator polyethylene with high thermal conductivity and dielectric strength

Polymer dielectrics are widely used as an insulating material in advanced electronics and electric power systems that require operation at high temperatures and high breakdown conditions. The miniaturization and higher power of modern electronics generate lots of heat, which needs to be dissipated quickly to avoid device malfunction or breakdown. This increased heat also leads to the temperature rise of insulating materials,...

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2D Materials cut sharper

etched-geometric-shapes-in-bluePrecise patterning of 2D materials is a route to computation and storage using 2D materials, which can deliver potentially better performance and much lower power consumption compared to the technology of today. Researchers now demonstrate an etching process that makes it possible to downsize nanostructures to the 10-20 nm range and obtain smooth edges, sharp corners, and feature sizes significantly below the resolution limit...

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Hydrogels

hydrogelsHydrogels are fascinating natural or synthetic polymer materials that exhibit very versatile chemistries and physical or biological properties. They are 3D networks of either physically or chemically crosslinked polymers that resemble organic tissues and that can hold large amounts of water within their interlocked molecular network. These soft, translucent materials swell or shrink in response to water absorption or desorption...

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Intracellular activation of RNA interference upon DNA-driven organization of quantum dot assemblies

quantum-dot-assembliesIn addition to the plethora of functions such as storage of genetic information and regulation of its expression, DNA and RNA are also highly programmable biomaterials. DNA can be utilized to design short complementary sequences to be used as the linkers which bring together and organize other biological and inorganic materials. Quantum dots are one such inorganic candidate. Researchers now utilized DNA for the precise assembly...

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