Preparation And Application Of Liquid Metal Nano-droplets

Nano-droplets made from gallium-based liquid metal alloys have potential application value in the fields of flexible electronics,catalysis,and biomedicine.The preparation and application of liquid metal nano-droplets is an important direction of current liquid metal research.In this dissertation,first,the ultrasonic method is used to prepare stable,controllable,and multi-surfactant-modified liquid metal nanodroplets.Then,based on dopamine as a surfactant,the conductivity of the liquid metal nanodroplets modified by dopamine,Catalysis,and photothermal effects.The main contents include the following three aspects:First,liquid metal nano-droplets are prepared by the ultrasonic method.First,a large liquid metal(gallium indium tin alloy,Ga In Sn)is sonicated in a solution containing different surfactants.During the sonication process,the surfactant can stabilize the liquid metal nano droplets in the system,which is beneficial to the nano liquid the droplets continue to miniaturize and help form stable liquid metal colloids.Different surfactant-modified liquid metal nanodroplets exhibit different self-assembly behaviors.Among them,using dopamine(DA)as a surfactant,the liquid metal nano-droplets can form a tightly packed film after drying.The effects of different sintering temperatures and dopamine concentrations on film formation of liquid metal nanodroplets were investigated.Dry dopamine(1mg/m L)modified liquid metal nanodroplets at 55 °C have excellent film-forming properties and good electrical conductivity.Second,light-induced deformation of polydopamine-coated liquid metal nanodroplets.Liquid metal(LM)nano-droplets are prepared by sonicating large pieces of liquid metal in dopamine hydrochloride aqueous solution.Dopamine not only acts as a surfactant,but also stabilizes the LM nano-droplet dispersion during sonication,thereby making liquid metal nano-liquids Drop sizes can be made even smaller.In addition,by adding 2-amino-2-(hydroxymethyl)-1,3-propanediol(Tris)to the suspension,self-polymerization of dopamine molecules is initiated to form polydopamine(PDA)-coated liquid metal nano-droplets.Due to the high photothermal conversion of polydopamine,the liquid metal nano-droplets coated with polydopamine are transformed from a spherical shape to an ellipsoidal shape by infrared laser irradiation.Because of the biocompatibility and high versatility of polydopamine and liquid metal,polydopamine-coated liquid metal nanodroplets have great potential applications in nanomedicine delivery.Third,the electric substitution method can synthesize liquid metal core-solid metal satellite nanostructures.Large pieces of liquid metal were sonicated in 10 m L dopamine hydrochloride(8 mg/m L)ethanol solution(water and ethanol ratio 5: 4)to prepare liquid metal(LM)nano droplets,and 6 mg of2-amino-2-(hydroxymethyl)-1,3-propanediol(Tris)to the suspension was added to the suspension.(Tris)initiates self-polymerization of dopamine molecules to form polydopamine(PDA)-coated LM nanodroplets.The centrifuged polydopamine-modified liquid metal nanodroplets are mixed with chloroauric acid solutions of different concentrations to form a liquid metal core-solid nanogold satellite nanostructure.The nanostructure formed by 20 m L chloroauric acid solution(1 mol/m L)and polydopamine modified liquid metal nano-droplets dispersed in 5 m L deionized water has good catalytic performance for 4-nitrophenol.