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Additional file 1: Figures S1-S25, Tables S1-S3, and Supplementary Notes 1-2.

Additional file 2. Review history.

Liquid metal is increasingly attracting attention because of the fluidity properties and the electrical and thermal conductivity of metals. However, the preparation of stable liquid metal nanoparti...

Liquid metals show unparalleled advantages in printable circuits, flexible wear, drug carriers, and electromagnetic shielding. However, the efficient and large-scale preparation of liquid metal nanodroplets (LM NDs) remains a significant challenge. Here, we propose a simple and efficient method for the large-scale preparation of stable eutectic gallium indium nanodroplets (EGaIn NDs). We compared different preparation methods and found that droplets with smaller particle sizes could quickly be produced using a shaking technique. The size of EGaIn NDs produced using this technique can reach 200 nm in 30 min and 100 nm in 240 min. Benefiting from the simple method, various surfactants can directly modify the surface of the EGaIn NDs to stabilize the prepared droplets. In addition, we discovered that shaking in an ice bath produced spherical nanodroplets, and after shaking for 30 min in a non-ice bath, rod-shaped gallium oxide hydroxide (GaOOH) appeared. Furthermore, the EGaIn NDs we produced have excellent stability&mdash, after storage at room temperature for 30 days, the particle size and morphology change little. The excellent stability of the produced EGaIn NDs provides a wider application of liquid metals in the fields of drug delivery, electromagnetic shielding, conductive inks, printed circuits, etc.

Heat dissipation coatings with high thermal conductivity play an important role in the thermal management of many industrial applications. It is still a big challenge to prepare highly thermal conductive coatings in the industry. Herein, we report a novel approach to prepare highly conductive thermal polyurethane composite coatings which contain dopamine-modified conductive fillers. Graphene oxide (GO), carbon nanotube (CNT), and nano-diamond (ND) were used as two-dimensional (2D), one-dimensional (1D), and zero-dimensional (0D) thermal conductive fillers respectively. The thermal conductivity test results indicate that GO and CNT can form a “bridge-like” structure and build more heat conduction channels. The test shows that the 2D + 1D combination has better thermal conductivity and more synergistic effect than the 2D + 0D combination.