Gallium-based liquid metals show excellent thermal and
electrical conductivities with low viscosity and non-toxicity.
Their melting points are either lower than or close to room
temperature, which endows them with additional advantages
in comparison to the solid metals; for example, they are
flexible, stretchable and reformable at room temperature.
Recently, great improvements have been achieved in
developing multifunctional devices by using Ga-based liquid
metals, including actuators, flexible circuits, bio-devices
and self-healing superconductors. Here, we review recent
research progress on Gallium-based liquid metals, especially
on the applications aspects. These applications are mainly
based on the unique properties of liquid metals, including
low melting point, flexible and stretchable mechanical
properties, excellent electrical and thermal conductivities and