CN115121795A - Shell structure capable of driving metal gallium drops to move, and preparation method and application method thereof - Google Patents

Abstract

The invention relates to the field of functional materials, in particular to a shell layer structure capable of driving metal gallium droplets to move, and a preparation method and application method thereof. The ratio of the circumscribed diameter of the foil to the nickel foam is 1:1 to 1:2. Compared with the prior art, the present invention utilizes the characteristics of copper and gallium surface contact at room temperature to rapidly form copper-gallium alloy to produce strong adhesion and non-wetting of nickel foam and gallium, and design a copper foil@foamed nickel shell structure for liquid metal gallium, The structure responds significantly to the static magnetic field, and the movement of the metal gallium droplets can be driven by the static magnetic field. At the same time, the inner side of the structure has strong adhesion to the surface of the liquid metal gallium, but the outer side and the gallium are not wetted at all, which can effectively avoid the polymerization of the liquid metal gallium droplets in the acid/alkaline solution.

Description

A shell structure capable of driving metal gallium droplets to move and its preparation method and application method

technical field

The invention relates to the field of functional materials or the field of robotics, in particular to a shell structure capable of driving metal gallium droplets to move, and a preparation method and application method thereof.

Background technique

At room temperature, metal gallium and its room temperature alloys have excellent fluidity, variable surface tension, extremely high electrical and thermal conductivity, and low toxicity, and have been widely used in flexible robots, flexible electronic devices and other fields. Wide range of applications. In recent years, researchers have found that the movement of metal gallium can be effectively driven by the electric field and the reaction of metal aluminum with the solution inside gallium. However, since metal gallium does not have magnetism, it is difficult for a static magnetic field to drive the movement of metal gallium. Some researchers add Fe, Ni and other micron-scale powders to metal gallium, and drive the movement of gallium droplets through the magnetic properties of these powders. However, micron-scale powders such as Fe and Ni will significantly affect the fluidity of metal gallium, and it is difficult to separate from liquid gallium. At the same time, in the above research system, the metal gallium droplets must be isolated, because when different metal gallium droplets approach, due to the great interatomic attraction of metal gallium, the metal gallium droplets will rapidly merge to form larger droplets . At present, the research on inhibiting the aggregation of metal gallium droplets in the solution system is limited to the micro-nano scale, and the methods adopted mainly focus on the adhesion of organic layers such as polydopamine and polyethylene glycol (5-20 kDa). These organic materials adhering to the surface of micro-nano metal gallium particles have no magnetic properties, making it difficult for gallium droplets to be driven by magnetic fields.

SUMMARY OF THE INVENTION

In order to solve the above technical problem or one of the technical problems, the present invention provides a shell structure that can drive the movement of metal gallium droplets, which is different from the prior art in that it includes a nickel foam sheet and a copper foil bonded with the nickel foam sheet. The ratio of the outer diameter of the copper foil to the nickel foam is 1:1 to 1:2.

The present invention also provides a method for preparing the shell structure capable of driving the movement of metal gallium droplets, comprising the following steps:

a. Preparation of copper foil and nickel foam: Cut nickel foam and copper foil into required specifications;

b. Cleaning of copper foil and nickel foam: soak the copper foil in analytically pure acetone for 3-5 minutes at room temperature; soak the nickel foam in analytically pure ethanol for 3-5 minutes at room temperature; Put the soaked copper foil and nickel foam in an ultrasonic container filled with deionized water, clean for 1-2 minutes, dry the silicon wafer with clean surface with nitrogen, and store it in a desiccator;

c. Preparation of copper foil@foamed nickel shell structure: the copper foil sheet and the foamed nickel sheet in step b are bonded with acrylic glue; the copper foil sheet is adhered to the center of the foamed nickel sheet;

d. Drying: The copper foil@foam nickel shell structure of step c is dried for 5-10 minutes under nitrogen atmosphere, and the samples are stored in a desiccator after drying.

The present invention also provides an application method of the shell structure capable of driving the movement of metal gallium droplets, comprising the steps of:

e. In the acidic or alkaline solution, according to the size of the metal gallium droplet, select the copper foil@foamed nickel shell structure with the corresponding specifications, and stick the copper foil@foamed nickel shell structure with the copper foil on the metal gallium surface until the metal gallium surface is mostly covered by nickel foam sheet.

Compared with the prior art, the present invention utilizes the characteristics of copper and gallium surface contact at room temperature to rapidly form copper-gallium alloy to produce strong adhesion and non-wetting of nickel foam and gallium, and design a copper foil@foamed nickel shell structure for liquid metal gallium, The structure responds significantly to the static magnetic field, and the movement of the metal gallium droplets can be driven by the static magnetic field. At the same time, the inner side of the structure has strong adhesion to the surface of the liquid metal gallium, but the outer side and the gallium are not wetted at all, which can effectively avoid the polymerization of the liquid metal gallium droplets in the acid/alkaline solution.

Description of drawings

FIG. 1 is a schematic structural diagram of the shell structure of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 .

FIG. 3 is a schematic diagram of the state of a metal gallium droplet with a shell structure attached thereto.

FIG. 4 is an effect diagram of the displacement of the metal gallium droplets attached with the shell structure driven by the static magnetic field.

The square below the glass dish in the picture is a magnet.

FIG. 5 is an effect diagram of the polymerization performance test of the metal gallium droplet with the shell structure attached and the metal gallium droplet without the shell structure attached.

Detailed ways

Examples 1-3

Using the preparation method of steps a to e, for a gallium droplet with a diameter of 0.5 cm, using step f to measure the copper foil@foamed nickel shell layer can suppress the gallium droplet deformation between 40.5-60.7%. fusion, as shown in the following table:

Using the preparation method of steps a to e, in a 0.4mol/L solution, under the attraction of a rubidium magnet, the driving ability of the above piece of copper foil@foamed nickel structure attached to the surface to the gallium droplet was measured, as shown in the following table:

a. Preparation of copper foil and nickel foam sheet: First, cut copper foil with a purity of 99.9% and a thickness of 0.05mm into a square with a length*width of 3*3mm, and cut a nickel foam with a thickness of 0.05mm into a length*width of 3*3 mm square;

b. Cleaning of copper foil and nickel foam: first, soak the copper foil and nickel foam in analytical pure acetone, soak for 3-5 minutes at room temperature, and put the soaked copper foil and sheet into an ultrasonic container filled with deionized water medium, wash for 1-2 minutes. Dry the surface-cleaned silicon wafer with nitrogen and store it in a desiccator;

c. Preparation of copper foil@foamed nickel protective shell structure: the copper foil and foamed nickel in step b are bonded by plane bonding with 0.01-0.05 μl acrylic glue. The copper foil is adhered to the center of the nickel foam, and the control ratio of the diameter of the copper foil to the diameter of the nickel foam is controlled between 1:1 and 1:2.

d. Drying: the copper foil@foam nickel protective shell structure of step c is dried under nitrogen atmosphere for 5-10 minutes, and the samples are stored in a desiccator after drying;

e. Application of copper foil@foamed nickel protective shell structure: in acidic or alkaline solution, according to the size of metal gallium droplets, select the appropriate size of copper foil@foamed nickel protective shell structure, the diameter of foamed nickel is larger than that of metal gallium The droplet was controlled between 1:10 and 1:5. Use copper foil to stick to the surface of metal gallium until most of the surface of metal gallium is covered with nickel foam, as shown in Figure 3.

As shown in Figure 4, in an acidic or alkaline solution, using a rubidium magnet to attach copper foil@foam nickel protective shell structure metal gallium droplets from the petri dish close to the surface, it can be clearly observed that the metal gallium droplets are dragged by the static magnetic field verb: move.

As shown in Figure 5, in an acidic or alkaline solution, the metal gallium droplets with the copper foil@foam nickel protective shell structure on the surface are pressed against the metal gallium droplets by uniform compression at a speed of 10-30cm/min. combine. It was found that in 0.4 mol/L hydrochloric acid solution, copper foil@foamed nickel protective shell layers of different sizes can inhibit the fusion between gallium droplets with the deformation amount of gallium droplets ranging from 40.5-60.7%.

The acidic or basic solution in steps e, f and g is an aqueous solution of 0.4-1.0 mol/L hydrochloric acid or 0.005-0.01 mol/L sodium hydroxide.

The invention not only provides a new effective technical means for inhibiting the aggregation of the metal gallium droplets, but also provides a new idea for the movement of the metal gallium droplets driven by the static magnetic field. Because the preparation method of copper foil@foam nickel protective shell structure has simple equipment requirements, easy operation, wide range, good controllability, good reproducibility, no special condition requirements, easy operation, simple equipment requirements and high cost low, so it is especially suitable for commercial large-scale production.

Claims (6)

1. A shell structure capable of driving metal gallium droplets to move, characterized in that it comprises a nickel foam sheet (1) and a copper foil sheet (2) bonded to the nickel foam sheet (1), and the copper foil sheet (2). ) to the circumscribed diameter of the nickel foam sheet (1) in a ratio of 1:1 to 1:2. 2 . The shell structure capable of driving metal gallium droplets to move according to claim 1 , wherein the nickel foam sheet ( 1 ) is a square sheet with a thickness of 0.05 mm and a length * width of 3 * 3 mm; The foil (2) is a square sheet with a purity of 99.9%, a thickness of 0.05mm, and a length*width of 2*2mm, and the copper foil (2) is located in the center of the nickel foam sheet (1). 3. the preparation method of a kind of shell structure capable of driving metal gallium droplets to move according to claim 1 or 2, is characterized in that, comprises the steps: a. Preparation of copper foil and nickel foam: Cut nickel foam and copper foil into required specifications; b. Cleaning of copper foil and nickel foam: soak the copper foil in analytically pure acetone for 3-5 minutes at room temperature; soak the nickel foam in analytically pure ethanol for 3-5 minutes at room temperature; Put the soaked copper foil and nickel foam in an ultrasonic container filled with deionized water, clean for 1-2 minutes, dry the silicon wafer with clean surface with nitrogen, and store it in a desiccator; c. Preparation of copper foil@foamed nickel shell structure: the copper foil sheet and the foamed nickel sheet in step b are bonded with acrylic glue; the copper foil sheet is adhered to the center of the foamed nickel sheet; d. Drying: The copper foil@foam nickel shell structure of step c is dried for 5-10 minutes under nitrogen atmosphere, and the samples are stored in a desiccator after drying. 4. The application method of a shell structure capable of driving metal gallium droplets to move according to claim 1 or 2, wherein the method comprises the following steps: e. In the acidic or alkaline solution, according to the size of the metal gallium droplet, select the copper foil@foamed nickel shell structure with the corresponding specifications, and stick the copper foil@foamed nickel shell structure with the copper foil on the metal gallium surface until the metal gallium surface is mostly covered by nickel foam sheet. 5. The application method of a shell structure capable of driving metal gallium droplets to move according to claim 4, wherein the acidic solution is an aqueous hydrochloric acid solution of 0.4-1.0 mol/L, and the alkaline solution is 0.005-0.01mol/L sodium hydroxide aqueous solution. 6. a kind of application method of the shell structure that can drive metal gallium droplet to move according to claim 4, is characterized in that, the circumscribed circle diameter of nickel foam sheet: the diameter of metal gallium droplet is controlled at 1:10 to 1 :5 between.

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