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Showing Spotlights 1193 - 1200 of 2054 in category (newest first):

 

Photonic-plasmonic device fully compatible with AFM and Raman spectroscopy

photonic_crystal_cavitySingle molecule detection requires tools that have the detection sensitivity at the scale of single molecules. This could mean a spatial resolution requirement of only a few nanometers especially if the precise location of the molecule needs to be mapped. Researchers have already developed spectroscopic techniques capable of physical and chemical mapping on a nanometer scale. Researchers in Italy have now reported the design, fabrication and application of a photonic-plasmonic device that is fully compatible with atomic force microscopy and Raman spectroscopy - an approach that is novel in both scientific and technological aspects. The device consists of a two-dimensional dielectric photonic crystal cavity patterned on an AFM cantilever, together with a tapered silver waveguide placed at the center of the cavity.

Posted: Nov 24th, 2009

A smoother way to printing OLED devices

oledOLEDs - organic light-emitting diodes - are full of promise for a range of practical applications. With more efficient and cheaper OLED technologies it becomes possible to make ultraflat, very bright and power-saving OLED televisions, windows that could be used as light source at night, and large-scale organic solar cells. One of the drawbacks of this technology, apart from its currently high manufacturing cost, are problems with the OLED fabrication process where issues such as material damage, yield, and thickness uniformity haven't been completely solved yet. Researchers in Japan have now proposed a nanoparticle-based deposition method that might be able to overcome these fabrication problems.

Posted: Nov 23rd, 2009

European strategy for nanotechnology and the nanotechnology Action Plan

European_nanotechnologyEurope is a key player in nanotechnology and, about on the same level as the U.S., invests hundreds of millions of dollars, or rather euros, into nanotechnology research and development projects. Whereas the U.S. National Nanotechnology Initiative (NNI) in was established in 2001 to coordinate Federal nanotechnology research and development, the European Union's slowly grinding bureaucratic mills came up with a comparable program only three years later. In May 2004, the European Commission adopted the Communication Towards a European Strategy for Nanotechnology. It seeks to bring the discussion on nanoscience and nanotechnology to an institutional level and proposes an integrated and responsible strategy for Europe. Since then, the EU has issued updates on how they are doing with two implementation reports, the last one issued just a few days ago.

Posted: Nov 19th, 2009

How quality control of everyday products with AFM creates competitive advantages

afm_imageMany of today's high-tech products rely on nano-level functional structures, and in products such as mobile phones, integrated circuits and glasses they have already become commonplace. But with increasing demands on products and their quality, tiny structures and the ability to evaluate them are also becoming decisive factors for the production of everyday products. The experience of a ball-point pen maker shows how atomic force microscopy enables highly accurate quality control during manufacturing, eliminating entire production steps in the process. Everyone has had to contend with scratchy or messy ball-point pens, but not everyone knows that often this malfunction is the result of a manufacturing error: smooth writing depends largely on the roughness of the sphere at the tip of the pen. Its roughness needs to lie in a well-defined interval: too rough, and the pen leaks; too smooth, and it scratches and fails to transport enough ink. The roughness of this little sphere thus becomes the decisive quality indicator of the entire writing apparatus.

Posted: Nov 18th, 2009

Dude, nobody told me I was a nanotechnology consumer!

consumerMost products today are defined as 'nanotechnology product' because they contain nanoparticles in some form or other. For instance, many antimicrobial coatings contain silver in nanoscale form; food products and cosmetics contain nanoparticles; drug formulations are made with nanoscale ingredients; and some products are partially made with composite materials containing nanomaterials (e.g. carbon nanotubes or carbon nanofibers) to mechanically strengthen the material. Two researchers from the Norwegian National Institute for Consumer Research (SIFO), Harald Throne-Holst and Pal Strandbakken, argue that consumer rights in the nanotechnology age are not self-evident but rather have to be strengthened, partly redefined and certainly revived in order to empower and protect consumers.

Posted: Nov 17th, 2009

Remote-controlled nanocomposite for on-demand drug delivery inside the body

nanogelQuite a number of serious medical conditions, such as cancer, diabetes and chronic pain, require medications that cannot be taken orally, but must be dosed intermittently, on an as-needed basis, and over a long period of time. By combining magnetism with nanotechnology, researchers have now created a small implantable device that encapsulates the drug in a specially engineered membrane, embedded with magnetic iron oxide nanoparticles. The application of an external, alternating magnetic field heats the magnetic nanoparticles, causing the gels in the membrane to warm and temporarily collapse. This collapse opens up pores that allow the drug to pass through and into the body. When the magnetic field is turned off, the membranes cool and the gels re-expand, closing the pores and halting drug delivery. No implanted electronics are required.

Posted: Nov 16th, 2009

Pushing the envelope in atomic force microscopy

afmOver the past decade, Atomic Force/Scanning Probe Microscopy (AFM/SPM) has emerged as the leading tool for investigations at the nanoscale - doing everything from imaging, to compositional differentiation, to explorations of molecular forces. But aside from some interesting tweaks, add-ons and repackaging, the field has seen no fundamentally new instruments for several years. For the extremely high-resolution AFM/SPMs, there has literally been no completely new microscope for well over a decade. Enter the new Cypher AFM. Cypher was designed from the ground up with a host of new features and unmatched performance enabled by its revolutionary new design.

Posted: Nov 12th, 2009

Sharper and faster nanodarts kill more bacteria

A newly published antibacterial activity mechanism study demonstrates how a single walled carbon nanotube (SWCNT) kills bacteria by the physical puncture of bacterial membranes. The nanotubes would constantly attack the bacteria in solution, degrading the bacterial cell integrity and causing the cell death. This work elucidates several factors controlling the antibacterial activity of pristine SWCNTs and provides an insight in their toxicity mechanism. With regard to carbon nanotubes, in early toxicological studies, researchers obtained confounding results - in some studies nanotubes were toxic; in others, they were not. The apparent contradictions were actually a result of the materials that the researchers were using.

Posted: Nov 10th, 2009