Category Technology/Electronics

Representative experiment of a modular microrobot. From (a), a 3-bead robotic microswimmer approaches and assemble with a single non-motile bead and transform into a 4-bead microswimmer. From (b–f), the microswimmer continues to approach and combine with single beads, and eventually modulate into a 9-bead microswimmer. At (g), the 9-bead microswimmer breaks into three different microswimmers under high rotation frequency due to increased shear stress leading to structural flexing.

At center, in green, is the new three-atom hydrogen ‘chain.’ It is surrounded by several ‘normal’ two-atom molecules of hydrogen, also in green. The new chain configuration appears in the new material NaH7, which was produced under high pressure and high temperature conditions. The new material could change the superconductivity landscape and be useful for hydrogen storage in hydrogen fuel cells. Credit: Image courtesy Duck Young Kim

Structural comparison of penlandite with hydrogenases. (a) Crystal structure of Ni4.5Fe4.5S8. The nickel and iron sites (brown) share the same positions within the crystal and are bridged by sulfur (yellow). (b) Active site of the [FeNi]-hydrogenase (PDB: 4U9H) as well as (c) [FeFe]-hydrogenase (X=NH, PDB: 1HFE).

Mr. Zafer Hawash setting up the hanging mercury drop electrode system for conductivity measurement. Credit: Image courtesy of Okinawa Institute of Science and Technology Graduate University – OIST