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Nanotechnology Spotlight

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Showing Spotlights 129 - 136 of 1919 in category (newest first):

 

Ultrahigh-resolution digital image sensor achieves pixel size of 50 nm

nanorod_pixelTo overcome the pixel size limitation of existing digital image sensors, both new materials with enormous photoelectric properties and novel device architectures are required. In new work, researchers are now reporting ultra-high resolution nanorod digital image sensor (NDIS) which is fabricated by sandwiching vertically aligned zinc oxide nanorod arrays between orthogonal top and bottom nanostripe electrodes. The most important application of the NDIS is as a next-generation digital image sensor with ultra-high resolution, well beyond the limit of existing techniques.

Posted: Sep 29th, 2015

Scientists make nanofibers with a hairbrush

hairbrushResearchers developed a simple controllable set-up for drawing single filament nanofibers from polymer solutions or melts using a rotating rod or a set of rods (round brush). This method can be used to produce 3D tissue scaffolds by winding nanofibers onto spools of different shapes and dimensions and depositing cells of interest at the same time. The new method, which the scientists named touch-spinning, has excellent control over the fiber diameter and is compatible with all kinds of polymeric materials, polymer melts and solutions, polymer composite materials, and biopolymers.

Posted: Sep 23rd, 2015

Repair nanobots on damage patrol (w/video)

nanoparticlesResearchers engineered synthetic nanomotors that self-propel and autonomously detect surface cracks in electronic devices and rapidly restore the conductive pathway. These nanomotors were inspired by the chemotaxis of neutrophils toward inflammation sites and the aggregation of platelets at the collagen fibers of a wound to stop bleeding. The catalytic nanomotors are composed of conductive gold/platinum spherical Janus particles that self-propel efficiently in the presence of hydrogen peroxide fuel.

Posted: Sep 22nd, 2015

Novel graphene-gold metasurface architecture provides significant gains in plasmonic detection sensitivity

graphene_sensorWith increasing sensitivity, electrical, mechanical and optical sensors are able to detect low molecular weight chemical and biological analytes under ever more dilute conditions. At the same time, though, researchers want to keep the sensing process as simple as possible without complex functionalization and complicated preparation steps for the in situ detection. A novel graphene-gold metasurface-based biosensing architectures makes extreme phase singularities possible due to a strong field enhancement on the graphene-gold interface.

Posted: Sep 14th, 2015

Smartphone-based nano-biosensors for early detection of tuberculosis

smartphoneA typical preliminary test for tuberculosis includes culturing the samples for at least 1-2 weeks in a lab, followed by examination under a fluorescence microscope. The lack of rapid, accurate, and inexpensive point-of-care tools for detecting low amounts of M. Tuberculosis is a critical bottleneck in early diagnosis and appropriate treatment. Researchers have now developed a rapid and flexible nano-biosensor for diagnosing TB in early stages using smart phones.

Posted: Sep 11th, 2015

Greatly improved zeolite membranes using high-aspect-ratio seeds

zeolitesThe ability to separate and purify specific molecules in a chemical mixture is essential to chemical manufacturing. By using membranes - rather than energy-intensive processes such as distillation and crystallization - the energy efficiency of these processes could be greatly increased. Crystalline materials known as zeolites are considered as an excellent membrane material due to their molecular-sized pores and high thermal, mechanical and chemical stabilities. In a new study, researchers prepared slice-shaped zeolite seeds by using various gel recipes and crystallization temperatures.

Posted: Aug 31st, 2015

Self-healing hybrid gel system

supramolecular_gelPreviously reported conductive self-healing materials usually need large amounts of inorganic conducting fillers and their self-healing behaviors are only activated under specific external stimuli, such as heat, light, pH, etc. A new hybrid gel is composed of conductive polymer and a metal-ligand supramolecule; the novel gel exhibits attractive properties associated with both conventional polymers, such as ease of synthesis and processing, and great self-healing performance at room temperature without any stimuli.

Posted: Aug 25th, 2015

A nanoscale color filter

wavelengthFor the past decade, researchers have searched for robust, inorganic color filters that can replace traditional organic dye-based filters for better stability, lifetimes, performance, and amenability to miniaturization. I new work, researchers fabricated an inorganic filter that can operate with a single element. This represents an important step toward nanoscale color filters. The team devised a a simple design in which light can be filtered and tuned over wavelength through the use of a single nanoscale element in the form of a ZnO nanorod integrated with a silver cavity.

Posted: Aug 13th, 2015