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A scanning electron micrograph showing a cluster of silver nanoparticles released by scratching a nanosilver-infused cutting board. The cluster is approximately 900 nanometers across, or about the size of a typical bacterium. Credit: NIST

Do kitchen items shed antimicrobial nanoparticles after use?

Silver nanoparticles measuring between one and 100 nanometers (billionth of a meter) in size are being incorporated outside the United States into a variety...
Kilogram No. 20, in the U.S., is one of several “working standards.” Credit: Science Source

Redefining the kilogram: A turning point for humanity

The kilogram is the base unit of mass in the International System of Units (SI), and is defined as being equal to the mass...
False-color images showing variations in atom numbers (1 to 5 atoms, left to right) and density in different lattice cells of JILA’s strontium lattice atomic clock. JILA researchers observed shifts in the clock’s frequency that arise from the emergence of multi-particle interactions when three or more atoms occupy a single cell. Credit: Aki Goban, Ye group/JILA

Signs of interactive form of quantum matter

For the first ever time, JILA scientists have confined groups of a couple of atoms and precisely estimated their multi-particle cooperations inside an atomic clock....
A 3D topographic image of a single voxel of polymerized resin, surrounded by liquid resin. NIST researchers used their sample-coupled-resonance photo-rheology (SCRPR) technique to measure how and where there material’s properties changed in real time at the smallest scales during the 3D printing and curing process. Credit: NIST

New method to measure 3D polymer processing precisely

Scientists at the National Institute of Standards and Technology (NIST) have demonstrated a novel method based on light-based atomic force microscopy (AFM), named sample-coupled-resonance photorheology...
Illustration depicting how specific frequencies, or colors, of light (sharp peaks) emerge from the electronic background noise (blue) in NIST’s ultrafast electro-optic laser. The vertical backdrop shows how these colors combine to create an optical frequency comb, or “ruler” for light. Credit: D. Carlson/NIST

New electro-optic laser pulses 100 times faster than usual ultrafast light

Using common electronics, NIST scientists have developed a laser that pulses 100 times more often than conventional ultrafast lasers. This newly developed laser is expected...
(a) Experimental ranging setup. A target obstructed by flames (depicted is an acetylene flame) is scanned with a FMCW LADAR. The target is placed ∼0.5  m behind this wall of flames. The total stand-off is 2 m. Range measurements are taken continuously at a 1-kHz update rate. A fast-steering mirror (FSM) sweeps the beam across the target, and the resulting 3D point cloud is then transformed to obtain Cartesian 𝑥𝑦𝑧 points. (b) 𝑥𝑦𝑧 3D point clouds. Left panel, machined aluminum step-block. Right panel, video (see Visualization 1) of a piece of chocolate, showing the deformation due to the flame heat (the frame rate is accelerated 60× to 1 Hz).

Laser ranging can see 3D objects melting in fires

Using Laser detection and ranging (LADAR) system, scientists at the NIST have imaged three-dimensional (3D) objects melting in flames. Doing this, they got a precise, safe and...
New instrument helps scientists see what they couldn't see before

New instrument helps scientists see what they couldn’t see before

Scientists at the National Institute of Standards and Technology (NIST) have to build a new custom-instrument that enables scientists to glimpse moment-by-moment changes in materials on...

How reliable are turtles for measuring ocean trash and marine health?

Marine debris, including plastics, paper, wood, metal, and other manufactured materials are found on beaches worldwide and at all depths of the ocean. About...
Schematic of the coating layers in a typical automobile composite body. Mar and scratch damages from a variety of object impacts are shown. Credit: Eastman Chemical Co./ K. Irvine, NIST

To improve auto coatings, new tests do more than scratch the surface

Scientists at the National Institute of Standards and Technology (NIST) have developed a new suite of tests for simulating scratching processes on automobile clearcoats. Data from...