Dengue fever, an infectious tropical disease caused by a mosquito-borne virus, afflicts millions of people each year, causing fever, headache, muscle and joint pains and a characteristic skin rash. In some people the disease progresses to a severe, often fatal, form known as dengue hemorrha ... more
Elemental and magnetic imaging using X-rays and a microscope
15-06-2012: A team of researchers has developed a new microscope that can image the elemental and magnetic properties of a wide range of energy-important materials that are used in devices such as solar cells and solid-state lighting.
The imager is based on a technique known as X-ray excited luminescence microscopy (XELM). It was created by hitching a standard optical microscope to a synchrotron X-ray source. Synchrotrons produce X-rays and other forms of electromagnetic radiation by sending electrons on a curved path at nearly the speed of light.
When the X-rays strike the material being imaged, some of them are absorbed, which causes the sample to luminesce. The microscope portion of the imager is able to detect differences in this luminescence, which is directly related to both the elements in the sample and their magnetic properties. This technique combines the spatial resolution of optical microscopy with the element and magnetic specificity and precision of synchrotron radiation.
It is able to spatially resolve features as small as one micron. However, this value was degraded in practice due to vibrations or subtle shifting of the systems used to direct the X-ray beam, though future refinements should alleviate any stability issues.
XELM has some advantages over other techniques in that it is especially useful at low temperatures and can image in the presence of electric and magnetic fields. The results were accepted for publication in the American Institute of Physics' journal Review of Scientific Instruments.
R.A. Rosenberg et al.; Elemental and magnetic sensitive imaging using x-ray excited luminescence microscopy; Review of Scientific Instruments
Most people know about ultrasound through its role in prenatal imaging: those grainy, grey outlines of junior constructed from reflected sound waves. A new technology called an "acoustic diode," envisioned by researchers in China's Nanjing University, may dramatically improve future ultraso ... more
One of the keys to healthful living with Type 1 and Type 2 diabetes is monitoring blood glucose (sugar) levels to ensure they remain at stable levels. People can easily and reliably do this at home using electronic devices that read sugar levels in a tiny drop of blood. Now a team of German ... more
The overuse of nitrogen fertilizers in agriculture can wreak havoc on waterways, health and the environment. An international team of scientists aims to lessen the reliance on these fertilizers by helping beans and similar plants boost their nitrogen production, even in areas with tradition ... more
A team of researchers has developed a new microscope that can image the elemental and magnetic properties of a wide range of energy-important materials that are used in devices such as solar cells and solid-state lighting. The imager is based on a technique known as X-ray excited luminescen ... more
A collaboration between the Advanced Photon Source and Center for Nanoscale Materials at U.S. Department of Energy’s (DOE) Argonne National Laboratory has "seen" the crystallization of nanoparticles in unprecedented detail. “Nanoscience is a hot issue right now, and people are trying to c ... more
- 1Schleicher & Schuell has been purchased by Whatman plc
- 2Almost as sensitive as a dog's nose
- 3Three-dimensional model of bacterium
- 4Raman keeps lipstick evidence in the bag
- 5Do you want to know how much caffeine is in your drink?
- 6Breakthrough in DNA editing technology
- 73D IR images now in full color
- 8PIAB announces new Chief Executive Officer
- 9‘Forensic fingers’ for crime scene investigation
- 10Raman pixel by pixel