Showing Spotlights 1 - 8 of 2401 in category All (newest first):
In another step towards engineered living materials, researchers combined living bacteria and 3D-printed materials to grow bionic mineralized composites with ordered microstructures. It provides an example of harnessing living bacteria to design self-growing materials and opens the door for a new class of engineering materials that can self-grow like living creatures. This manufacturing strategy can be easily extended by selectively controlling the activity of living organisms to synthesize unprecedented structural composites with ordered, hierarchical, and gradient microstructures.
Feb 23rd, 2021
Researchers demonstrate composite materials with exceptional EMI shielding in the GHz and sub-THz frequency ranges while remaining electrically insulating. The composites use unusual fillers - chemically exfoliated bundles of quasi-one-dimensional van der Waals materials. The exceptional current conduction properties combined with extremely large aspect ratio of these composites couple strongly to high-frequency RF radiation while remaining electrically insulating in DC measurements.
Feb 18th, 2021
Beyond aesthetics, holograms on food - specifically, edible holograms - could be used to reduce packaging needs, for example, as information about nutritional content or labels could be printed directly onto the food item. To that end, researchers have developed a quick and low-cost fabrication method for producing holograms on edible substrates. They developed a direct laser interference pattering method to directly pattern one-dimensional nanostructures on corn syrup films.
Feb 17th, 2021
A major challenge in the development of implantable and ingestible biomedical electronic devices is the limited lifetime of their power sources. The energy requirements of these devices are highly dependent on their application and the complexity of the required electrical systems. The power unit, which is composed of one or more energy sources - batteries, energy-harvesting, and energy transfer - as well as power management circuits, supplies electrical energy to the whole system.
Feb 16th, 2021
Magnetic manipulation of nano- and microscale objects is a remote and non-invasive technology with potentially numerous applications in material sciences and life sciences, such as for instance drug delivery. However, a limitation of this technology is that it can only be applied to certain materials with magnetic response, i.e., ferromagnetic or superparamagnetic materials. A new technique allows to incorporate magnetic nanoparticles onto the nonmagnetic skeleton.
Feb 11th, 2021
In order to exploit the remarkable mechanical properties of graphene for practical applications, nanoscale graphene sheets need to be assembled into much larger, macroscopic structures. However, there are two pivotal issues that make this task challenging: One is the inherently misaligned and wrinkled structure of graphene platelets; another is the weak interfacial interaction among graphene platelets. Both these problems greatly degrade the properties of macroscopic graphene assemblies such as sheets and fibers.
Feb 10th, 2021
A novel method for fast and accurate local tuning of the optoelectronic properties of single-walled carbon nanotubes makes use of ultrafast-pulsed lasers. The method is based on localized two-photon oxidation of carbon nanotubes when the laser irradiates with energies far below the ablation threshold. At such low energies the nonlinear photochemical interaction of femtosecond laser and carbon atomic lattice prevent thermal effects.
Feb 8th, 2021
Inspired by chiral molecular structures, scientists are developing strategies to build artificial chiral materials by mimicking natural molecular structures using functional materials. Specifically, metal nanomaterials exhibit tailorable optical properties upon excitation of surface plasmons and become one of the most promising components to realize chiral optical metamaterials. Researchers now demonstrate all-solid-phase reconfigurable chiral nanostructures, where the geometry and chiroptical properties can be dynamically tailored and fully controlled on a solid substrate without liquid media.
Feb 1st, 2021