Scientists continue to create new uses for carbon nanotubes, those tiny cylinders comprised of pure carbon. A paper published today in the journal Nature describes a thermometer made out of a column of carbon just 10 micrometers long. According to the report, the nanodevice can measure temperatures between 50 and 500 degrees Celsius and "should be suitable for use in a wide variety of microenvironments."
Yihua Gao and Yoshio Bando of the National Institute for Materials Science in Ibaraki, Japan, filled nanotubes less than 150 nanometers in diameter with a one-dimensional column of liquid gallium. In larger quantities, liquid gallium has one of the widest temperature ranges of any metal, spanning 30 to 2,403 degrees C. The researchers determined that nanoquantities of the metal behave similarly and that the liquids behavior within the tube changes predictably with temperature.
Like the mercury in a conventional thermometer, the minuscule meniscus in the nanodevice moves up and down as the gallium expands and contracts in response to temperature. Gao and Bando suggest the new nanothermometer will extend temperature measurements in very small systems beyond the four to 80 kelvins range that current electronic-based devices can achieve.
Sarah Graham | Scientific American
Copper oxide photocathodes: laser experiment reveals location of efficiency loss
10.05.2019 | Helmholtz-Zentrum Berlin für Materialien und Energie
NIST research sparks new insights on laser welding
02.05.2019 | National Institute of Standards and Technology (NIST)
From June 25th to 27th 2019, the Fraunhofer Institute for Digital Media Technology IDMT in Ilmenau (Germany) will be presenting a new solution for acoustic quality inspection allowing contact-free, non-destructive testing of manufactured parts and components. The method which has reached Technology Readiness Level 6 already, is currently being successfully tested in practical use together with a number of industrial partners.
Reducing machine downtime, manufacturing defects, and excessive scrap
The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.
Fraunhofer ILT has been developing optical sensor technology specifically for production measurement technology for around 10 years. In particular, its »bd-1«...
The well-known representation of chemical elements is just one example of how objects can be arranged and classified
The periodic table of elements that most chemistry books depict is only one special case. This tabular overview of the chemical elements, which goes back to...
Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
Ferroelectricity is a state in which the constituent lattice “looks” in one specific direction, forming a macroscopic electrical polarisation. The ability to...
Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
The Earth’s gravity fluctuates from place to place. Geodesists use this phenomenon to observe geodynamic and climatological processes. Using...
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