Nanoscale materials like quantum dots, carbon nanotubes, graphene, or nanowires, have intriguing properties, but unless they can be assembled in to larger structures it is difficult to take advantage of these properties. Figuring out how to assemble nanostructures into functional macroscale assemblies is one of the key challenges that nanoscientists around the world are faced with. In the area of nanowires, this has led to researchers exploring various nanowire assembly techniques ranging from Langmuir Blodgett alignment to electrospinning. Researchers have now developed a novel approach for assembling nanowires into macroscopic yarns that consist of millions of nanowires bundled together. The team found that light can be used to charge inorganic semiconducting nanowires. Once charged, the nanowires can be manipulated with electric fields.
Breath analysis of exhaled breath condensate has been increasingly recognized as a promising diagnostic method to link specific gaseous components in human breath to medical conditions and exposure to chemical compounds. Sampling breath is also much less invasive than testing blood, can be done very quickly, and creates as good as no biohazard waste. Studies have shown that exhaled breath from a flu patient contains influenza viruses but, although the use of silicon nanowire (SiNW) sensors for virus detection is not new, so far no studies have been conducted to apply silicon nanowire technology to the diagnosis of flu. Now, new research suggests that a SiNW sensor device, when calibrated by virus standards and exhaled breath condensate controls, can be reliably applied to the diagnosis of flu in a clinical setting with two orders of magnitude less time compared to the gold standard method RT-qPCR.
Burn injuries are one of the major global health problems. Every year 195,000 people from all over the world die because of fire alone. A burn injury may damage some or all skin layers and is caused by a hot solid, a hot liquid, or a flame. However, injuries related to electricity, radioactivity, ultraviolet radiation, chemicals and respiratory damage due to smoking are also considered as burn injuries. Besides cleaning the wound and applying various topical anti-microbial agents, wound dressings could be an effective solution in preventing microbial infections for burn care. The suitability of a burn wound dressing depends on a burn type. Conventional dressings are not efficient enough to induce haemostasis, adherence and in holding a moist environment around wound. Due to the advances in the field of nanotechnology, it is now possible to design nanofiber-based wound dressings where an electrospun-nanofibrous layer is applied to a basic support fabric material.
On-wire lithography is a recently developed nanotechnology fabrication technique that allows researchers to synthesize billions of gapped nanowires with nanometer control of gap length, within a single experiment. These gaps can then be used to integrate different material segments into a single nanowire in order to fabricate functional devices. In recent work, researchers have reported a simple but efficient method to use OWL to mass produce nanotube-bridged nanowires, including carbon nanotube (CNT) channels with channel lengths as small as 5 nm. Since the CNT-bridged nanowires are comprised of CNT junctions with gold electrodes, each of the nanowires could for instance work as a CNT-based sensing device, ballistic transistors, or resonators.
OLEDs - organic light-emitting diodes - are full of promise for a range of practical applications. OLED technology is based on the phenomenon that certain organic materials emit light when fed by an electric current and it is already used in small electronic device displays in mobile phones, MP3 players, digital cameras, and also some TV screens. OLEDs in fiber form could lead to revolutionary applications by integrating optical and optoelectronic devices into textile. Combined with nanoelectronic devices, we might one day see flexible optical sensors and display screens woven into shirts and other garments. You could literally wear your next-generation smart phone or iPad on your sleeves; including the solar panels to power them.
Fabrication conditions for nanoscale field-effect transistors (nano-FETs) have to meet very high requirements in order for these transistors to be used reliably as ultrasensitive and label-free molecular sensors in medical and environmental applications. Current fabrication routes for silicon-nanowire sensor construction involve high-cost, high-complexity - and often low-yield - top-down techniques such as e-beam lithography and focused ion beam. An alternative, and lower-cost, fabrication method is the use of pre-synthesized nanotubes or nanowires that are integrated into microstructures to form nano-FET sensors. Now, researchers have developed an automated vision-based nanomanipulation technique that is capable of precisely controlling the number of nanowires incorporated into each device.
A main difference between central and peripheral nervous system is the lack of regeneration after a neurotrauma, leading to severe and irreversible handicaps. While biomaterials have been developed to aid the regeneration of peripheral nerves, the repair of central nerves such as the optic nerval or nerve cells in the spinal cord remain a major challenge for scientists. The ability to regenerate central nerve cells in the body could reduce the effects of trauma and disease in a dramatic way and nanotechnologies offer promising routes for repair techniques. Scientists have now attempted to rescue retinal ganglion cell death and enhance their regeneration using an electrospun material made of biofunctional nanofibers.
Back in 2008 we reported on nanotechnology solution for radioactive waste cleanup, specifically the use of titanate nanofibers as absorbents for the removal of radioactive ions from water. Now, the same group that developed these nanomaterials reports in a new study that the unique structural properties of titanate nanotubes and nanofibers make them superior materials for removal of radioactive cesium and iodine ions in water. Based on their earlier work, the researchers have now demonstrated a potentially cost-effective method to remediate cesium and iodine ions from contaminated water by using the unique chemistry of titanate nanotubes and nanofibers to chemisorb these ions.