  Molecules are the smallest unit in matters that can exist independently,
relatively stable, and maintain physical and chemical activities. The atomic
species, alignment commands, and chemical bonds are key factors to dominate
their structures and properties. Here we disclosed a general chemistry effect
that the liquid metals can directly cut off oxygen-containing groups in various
molecular matters at room temperature, and then recombine the remaining groups
to form functional materials including nano semiconductors. Based on this
unique mechanism, we proposed a basic tool and named it as liquid metal
scissors for molecular directional clipping and functional transformation. As
proof-of-concept, we demonstrated the capabilities of eGaIn scissors made of Ga
and In particles, and revealed that the Ga on the surface of eGaIn could
directly snatch oxygen atoms from various targeted substances such as H2O, CO2
or CH3OH molecules to form gallium oxides. As illustration, after clipping, the
remaining hydrogen atoms of H2O molecules recombined to form H2, while the
remaining groups of CH3OH lead to H2, carbon quantum dots, and other related
substances. If needed, more molecules can also be manipulated via such
scissors. This finding refreshes the basic knowledge of chemistry and suggests
easygoing ways for molecular weaving, which may break up the limitations and
single features of molecular substances. It also opens up a universal route for
innovating future molecular chemical engineering, life science, energy and
environment, and biomedicine.
