What is Helonium? Credit: Mondolithic studios Helonium or Helium hydride is a molecular ion consisting of a helium atom and a hydrogen ion (HeH + ) and it is considered to be the first molecule of the universe. It is viewed as a protonated helium and it is the lightest heteronuclear ion. Discovery Helonium was first produced in the laboratory in Berkeley in 1925, under vacuum conditions with the aid of electricity by injecting protons of known energy into a rarefied mixture of hydrogen and helium. Although it is stable in isolation, it cannot be prepared in bulk because it is extremely reactive. Properties It is the strongest known acid with pKa -63 (for comparison hydrochloric acid pKa is -6.3) It is isoelectronic with molecular hydrogen H2 Its covalent bond is dative with a length of 0.772 A 80% of the electron charge is closer to the helium nucleus than to the hydrogen nucleus Unlike the helium hydride ion, the neutral helium hydride molecule HeH is not stable in the ground state De
What is it? It is a graphite screen-printed electrode coupled with a screen-printed bonded magnet (NdFeB particles dispersed in a thixotropic carbon ink) with 3 mm ∅, 56 ± 6 μm thickness. Scope The magnetic screen-printed electrode is a compact, portable, cheap, and disposable alternative to various accessories have been developed aiming to attract MNPs on the electrode surface, such as magnetic electrode shafts, electrochemical cells integrating (electro)magnets, magnetic stickers, etc. Investigation In the study parameters as the composition of the NdFeB/ink blend, the thickness and the pattern (compact or hole-engraved) of the printed magnet, and the thickness of the substrate were investigated by both experimental and theoretical studies. Results The performance is enhanced if a void round area is created in the center of the magnet to introduce a further area of strong field gradient. This pattern allows the development of stronger attracting forces to MNPs, higher MNPs loading, a