CN110861119A - Polydimethylsiloxane/liquid metal composite material and preparation method and application thereof - Google Patents
Polydimethylsiloxane/liquid metal composite material and preparation method and application thereof Download PDFInfo
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- CN110861119A CN110861119A CN201911211717.XA CN201911211717A CN110861119A CN 110861119 A CN110861119 A CN 110861119A CN 201911211717 A CN201911211717 A CN 201911211717A CN 110861119 A CN110861119 A CN 110861119A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J17/00—Joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J17/00—Joints
- B25J17/02—Wrist joints
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/447—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids
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Abstract
The invention relates to a polydimethylsiloxane/liquid metal composite material and a preparation method and application thereof, belonging to the technical field of composite materials. The technical problems that the existing magnetorheological material is in a viscous state, does not bear load and cannot be applied to a magnetorheological variable stiffness mechanism are solved. The composite material consists of a core body and a shell; the shell is of a cylindrical structure and is made of polydimethylsiloxane; the core body is of a solid structure, the size of the outer contour of the core body is matched with that of the cavity of the shell, the core body can be just embedded into the cavity, and the shell is made of a magnetorheological material consisting of iron particles and gallium indium tin liquid metal. The composite material can adjust the stiffness range of the composite material by adjusting the percentage of iron particles and the magnetic field intensity, has a large adjustment range and a high response speed, requires only millisecond time, can rapidly realize reversible change, and is suitable for preparing magnetorheological stiffness joints.
Description
Technical Field
The invention belongs to the technical field of composite materials, particularly relates to a polydimethylsiloxane/liquid metal composite material and a preparation method and application thereof, and particularly relates to an application of the polydimethylsiloxane/liquid metal composite material in a magnetorheological variable stiffness joint.
Background
With the increasing maturity of the robot technology, the application fields of the robot, such as wearable robots, rehabilitation robots, artificial limbs, etc., which take people as the center, are increasing, and the physical human-computer interaction between a user and a robot body is also increasing. Flexible robots are also becoming an important development direction for future robots. The variable stiffness joint is used as an important component of robot motion and also becomes a hot spot field of domestic and foreign research.
In order to improve the safety of human-computer interaction and improve the motion performance of a flexible robot, in the prior art, a plurality of driving modes are available for changing the joint stiffness, such as a mechanical stiffness changing mechanism, a particle filling stiffness changing mechanism, a layer interference stiffness changing mechanism, a rope driving flexible stiffness changing mechanism, a low-melting-point polymer stiffness changing mechanism, a shape memory alloy polymer stiffness changing mechanism, an electro-rheological stiffness changing mechanism and a magneto-rheological stiffness changing mechanism. The mechanical variable stiffness mechanism has the advantages of simple principle, convenient processing, easy control, strong bearing capacity, small adjustable range, large volume and low efficiency; the particle filling variable stiffness mechanism is relatively complex in design due to interference of auxiliary equipment such as a pump and a valve; the layer interference variable stiffness mechanism has the advantages of compact structure, light weight, small stiffness range and low load; the rope-driven flexible variable stiffness mechanism is complex to control and limited in space and flexibility; the liquid state of the low-melting-point polymer variable stiffness mechanism needs to consider the sealing property. The time for solid state to liquid state is long; the rigidity range of the shape memory alloy polymer variable rigidity mechanism is small, and the influence on joint motion is small; the electro-rheological rigidity-changing mechanism is time-consuming to manufacture and has a strong process; the rigidity of the magneto-rheological variable rigidity mechanism has the advantages of high reversible change response speed and wide rigidity range, and an external magnetic field can be accurately adjusted, so that the magneto-rheological variable rigidity mechanism is a relatively ideal driving mode capable of changing the rigidity of the joint.
Liquid metal refers to an amorphous metal that can be viewed as a mixture of a positively ionic fluid and a free electron gas. In the prior art, liquid metal mainly consists of gallium indium tin alloys in different proportions, and the gallium indium tin alloys in different proportions have different melting points. The gallium indium tin liquid metal and the magnetic particles can be mutually fused to form a magnetorheological material, the physical properties of the material are changed under the action of a magnetic field, and the gallium indium tin liquid metal has wide research and application in the fields of electronic circuits, flexible electronic devices and medicines. However, the magnetorheological material is in a viscous state and is not load-resistant, so that the magnetorheological material cannot be applied to the magnetorheological variable stiffness mechanism.
Disclosure of Invention
In view of the above, the invention provides a polydimethylsiloxane/liquid metal composite material, and a preparation method and an application thereof, in order to solve the technical problems that the existing magnetorheological material is in a viscous state, does not bear load and cannot be applied to a magnetorheological variable stiffness mechanism.
The technical scheme adopted by the invention for solving the technical problems is as follows.
The invention provides a polydimethylsiloxane/liquid metal composite material which consists of a core body and a shell;
the shell is of a cylindrical structure, and is made of Polydimethylsiloxane (PDMS);
the core body is of a solid structure, the size of the outer contour of the core body is matched with that of the cavity of the shell, the core body can be just embedded into the cavity, and the shell is made of a magnetorheological material consisting of iron particles and gallium indium tin liquid metal.
Preferably, the shell is a square cylinder, and the core is a solid square body.
Preferably, the wall thickness of the housing is 1 mm.
Preferably, in the magnetorheological material, the mass percent of the iron particles is 10-50 wt%.
Preferably, the particle size of the iron particles is 50 nm to 100 μm.
Preferably, the gallium indium tin liquid metal comprises the following components: 68.5 wt% of gallium, 21.5 wt% of indium and 10 wt% of tin.
The preparation method of the polydimethylsiloxane/liquid metal composite material comprises the following steps:
step one, weighing iron particles and gallium indium tin liquid metal according to a ratio, dissolving the iron particles and the gallium indium tin liquid metal in a hydrochloric acid ethanol solution, stirring for 5-8min at the rotating speed of 800 plus material of 1000rpm, and filtering to obtain a magnetorheological material;
and step two, embedding the magnetorheological material into the cavity of the shell to obtain the polydimethylsiloxane/liquid metal composite material.
Preferably, the concentration of the hydrochloric acid in the hydrochloric acid ethanol solution is 1 mol/L.
The invention also provides application of the polydimethylsiloxane/liquid metal composite material in preparation of magnetorheological variable stiffness joints.
Preferably, the polydimethylsiloxane/liquid metal composite material further comprises two covers, the two covers are respectively covered at two ends of the shell and are in interference fit with the cylinder opening of the shell, and the covers are made of polydimethylsiloxane.
The inventive principle of the present invention is shown in fig. 1-3:
the Young's modulus, Poisson's ratio, width and thickness of the core are respectively set as E1、v1A and 2h1The Young's modulus, Poisson's ratio and thickness of the shell are respectively E2、v2B and 2h2And the lengths of the core body and the shell are the same, and the rigidity k of the composite material can be obtained according to a mechanical formula and meets the following formula:
from this equation, the Young's modulus E of the core1If this occurs, the stiffness k of the composite material will change accordingly. After the gallium indium tin liquid metal and the iron particles are mixed, the gallium indium tin and the iron particles can be uniformly mixed and in a viscous state under the stirring action of a high-speed stirrer by using a hydrochloric acid ethanol solution as a solvent to form the magnetorheological material. Under the condition of no magnetic field, magnetic particles (iron particles) in the magnetorheological material are in disordered arrangement, and the rigidity is lower; under the action of a magnetic field, magnetic particles (iron particles) in the magnetorheological material can be arranged in a chain shape along the direction of the magnetic field, the rigidity is higher, and through experimental tests, under the action of the magnetic field, the Young modulus of the magnetorheological material can be enlarged by 10000 times. On the other hand, different particles are largeThe small iron particles have different solubilities in the gallium indium tin liquid metal, and the percentage of the iron particles can affect the Young's modulus of the magnetorheological material. Therefore, the Young modulus of the magnetorheological material can be controlled by controlling the percentage of the iron particles and the magnetic field intensity, the rigidity of the composite material can be controlled, and the magnetorheological rigidity mechanism can be realized. On the other hand, the magnetorheological material is in a viscous state and cannot be used independently, the magnetorheological material is packaged in polydimethylsiloxane, and the polydimethylsiloxane can bear external load and can be well sealed.
Compared with the prior art, the invention has the beneficial effects that:
the polydimethylsiloxane/liquid metal composite material adopts the magnetorheological material as the core body, can adjust the rigidity range of the composite material by adjusting the percentage of iron particles and the magnetic field intensity, has large adjustment range and high response speed, requires only millisecond time, and can quickly realize reversible change.
The polydimethylsiloxane/liquid metal composite material adopts polydimethylsiloxane as the shell, and can bear external load.
The polydimethylsiloxane/liquid metal composite material can be used for preparing magnetorheological variable-stiffness joints, the stiffness can be adjusted by realizing the Young modulus of the cavity magnetorheological material, and the polydimethylsiloxane/liquid metal composite material can be well sealed after covers are covered at two ends so as to prevent the magnetorheological material from flowing out.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a polydimethylsiloxane/liquid metal composite of the present invention;
in fig. 1, a shell, 2, a core.
FIG. 2 is a schematic diagram of the application of the polydimethylsiloxane/liquid metal composite material of the present invention in magnetorheological stiffness joints.
In fig. 3, (a) and (b) are schematic diagrams of the arrangement of the magnetic particles of the magnetorheological material of the present invention under the action of the magnetic field and the magnetic field.
In FIG. 4, (a) and (b) are both effect diagrams of the magnetorheological material of the invention.
In FIG. 5, (a), (b), (c), (d), (e), (f), (g) and (h) are curves of Young's modulus of the polydimethylsiloxane/liquid metal composite materials of examples 1 to 8 under different magnetic field strengths, respectively.
Detailed Description
For a further understanding of the invention, preferred embodiments of the invention are described below in conjunction with the detailed description, but it is to be understood that the description is intended to further illustrate the features and advantages of the invention and not to limit the claims to the invention.
As shown in FIG. 1, the polydimethylsiloxane/liquid metal composite material of the invention is composed of a shell 1 and a core 2;
the shell 1 is of a cylindrical structure, and the material of the shell 1 is polydimethylsiloxane; the core body 2 is of a solid structure, the size of the outer contour of the core body is matched with that of the cavity of the shell 1, the core body can be just embedded into the cavity, and the shell 1 is made of a magnetorheological material consisting of iron particles and gallium indium tin liquid metal.
In the above technical scheme, preferably, the shell 1 is a square cylinder, and the core 2 is a solid square body; the dimensions of the outer shell 1 and the core 2 are not particularly limited, and may be set according to actual needs, and the thinner the wall thickness of the outer shell 1 is, the better, usually 1 mm is.
In the above technical scheme, the particle size of the iron particles is preferably 50 nanometers to 100 micrometers, and the mass percentage of the iron particles in the magnetorheological material is preferably 10 wt% to 50 wt%. The particle size of the iron particles and the mass percent of the iron particles have mutual influence, and the upper limit of the mass percent is smaller and smaller along with the reduction of the particle size, for example, the particle size is 30 micrometers-100 micrometers, the upper limit of the mass percent is 50 wt%, the particle size is 500 nanometers-1000 nanometers, the upper limit of the mass percent is 30 wt%, the particle size is 50 nanometers-100 nanometers, and the upper limit of the mass percent is 20 wt%. In particular according to the maximum percentage of dissolution of iron particles of different sizes in the liquid metal.
In the above technical scheme, the gallium indium tin liquid metal comprises the following components: gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%.
The preparation method of the polydimethylsiloxane/liquid metal composite material comprises the following steps:
step one, weighing iron particles and gallium indium tin liquid metal according to a ratio, dissolving the iron particles and the gallium indium tin liquid metal in a hydrochloric acid ethanol solution, stirring the solution for 5 to 8 minutes at the rotating speed of 800-1000rpm, and filtering the solution to obtain the magnetorheological material, wherein an effect graph is shown in figure 4;
and step two, embedding the magnetorheological material into the cavity of the shell 1 to obtain the polydimethylsiloxane/liquid metal composite material.
In the technical scheme, the preferred stirring speed is 1000rpm, and the stirring time is 6 min; the stirring equipment usually adopts a high-speed stirrer.
In the technical scheme, the hydrochloric acid ethanol solution can be obtained commercially, and the concentration of the hydrochloric acid is 1 mol/L.
The invention also provides application of the polydimethylsiloxane/liquid metal composite material in preparation of a magnetorheological variable stiffness joint, and during application, the polydimethylsiloxane/liquid metal composite material further comprises two covers, wherein the two covers can respectively cover two ends of the shell and are in interference fit with a cylinder opening of the shell, and the cover is made of polydimethylsiloxane.
The present invention is further illustrated by the following examples.
Example 1
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (100 micrometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 1000rpm for 6min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% of iron particles are adopted respectively.
Example 2
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (75 micrometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 1000rpm for 5min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% of iron particles are adopted respectively.
Example 3
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (50 micrometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 1000rpm for 6min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% of iron particles are respectively adopted as the iron particles.
Example 4
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (30 micrometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, the mixture is stirred at 900rpm for 7min and filtered, and the magnesium alloy is obtained;
in the magnetorheological material, 10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt% of iron particles are respectively adopted as the iron particles.
Example 5
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (1000 nanometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 800rpm for 8min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, the iron particles are respectively 10 wt%, 20 wt% and 30 wt% of 8 iron particles.
Example 6
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (500 nanometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, the mixture is stirred for 7min at 800rpm and filtered, and the magnesium alloy is obtained;
in the magnetorheological material, 10 wt%, 20 wt% and 30 wt% of iron particles are respectively adopted as the iron particles.
Example 7
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (100 nanometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 1000rpm for 6min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, 10 wt% and 20 wt% of iron particles are respectively adopted as the iron particles.
Example 8
The polydimethylsiloxane/liquid metal composite material consists of a shell 1 and a core 2; the shell 1 is a rectangular cylinder (the length, the width and the thickness are respectively 100mm, 20mm and 8mm), and the material of the shell 1 is polydimethylsiloxane; the core body 2 is a solid cube (the length, the width and the thickness are respectively 100mm, 16mm and 6mm), the size of the outer contour is matched with the size of the cavity of the shell 1 and can be just embedded into the cavity, the shell 1 is made of a magnetorheological material, iron particles (50 nanometers) and gallium indium tin liquid metal (gallium 68.5 wt%, indium 21.5 wt% and tin 10 wt%) are dissolved in a hydrochloric acid ethanol solution, stirring is carried out at 1000rpm for 6min, and filtering is carried out, so as to obtain the gallium indium tin zinc ferrite;
in the magnetorheological material, 10 wt% and 20 wt% of iron particles are respectively adopted as the iron particles.
The magnetic field strengths of 0T, 0.1T, 0.2T, 0.3T, 0.4T, 0.5T, 0.6T and 0.7T were respectively added to the magnetorheological materials used in examples 1 to 8 to detect the Young's modulus of the magnetorheological materials, the detection device used a uniform magnetic field generator, and the detection results are shown in FIG. 5. As can be seen from fig. 5, the magnetorheological material adopted by the polydimethylsiloxane/liquid metal composite material of the present invention can improve the physical properties thereof under the action of the magnetic field, the young's modulus gradually increases with the increase of the magnetic field strength, when the magnetic field strength reaches 0.4T, the magnetization of the iron particles reaches saturation, and the young's modulus can be maximally expanded by ten thousand times; the iron particles with different particle sizes have different solubilities in the gallium indium tin liquid metal, and the iron particles with different diameters have different saturation percentages in the gallium indium tin liquid metal. Therefore, the rigidity range of the composite material can be adjusted by adjusting the percentage of iron particles and the magnetic field intensity, the adjusting range is wide, the response speed is high, the required time is only millisecond, and reversible change can be quickly realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The polydimethylsiloxane/liquid metal composite material is characterized by consisting of a core body and a shell;
the shell is of a cylindrical structure and is made of polydimethylsiloxane;
the core body is of a solid structure, the size of the outer contour of the core body is matched with that of the cavity of the shell, the core body can be just embedded into the cavity, and the shell is made of a magnetorheological material consisting of iron particles and gallium indium tin liquid metal.
2. The polydimethylsiloxane/liquid metal composite of claim 1, wherein the outer shell is a square cylinder and the core is a solid square.
3. The polydimethylsiloxane/liquid metal composite of claim 1, wherein the shell has a wall thickness of 1 millimeter.
4. The polydimethylsiloxane/liquid metal composite of claim 1, wherein the magnetorheological material comprises 10 wt% to 50 wt% iron particles.
5. The polydimethylsiloxane/liquid metal composite of claim 1, wherein the iron particles have a particle size of 50 nanometers to 100 microns.
6. The polydimethylsiloxane/liquid metal composite of claim 1, wherein the gallium indium tin liquid metal has a composition of: 68.5 wt% of gallium, 21.5 wt% of indium and 10 wt% of tin.
7. A method of preparing a polydimethylsiloxane/liquid metal composite material of any of claims 1-6, characterized by the steps of:
step one, weighing iron particles and gallium indium tin liquid metal according to a ratio, dissolving the iron particles and the gallium indium tin liquid metal in a hydrochloric acid ethanol solution, stirring for 5-8min at the rotating speed of 800 plus material of 1000rpm, and filtering to obtain a magnetorheological material;
and step two, embedding the magnetorheological material into the cavity of the shell to obtain the polydimethylsiloxane/liquid metal composite material.
8. The method of preparing a polydimethylsiloxane/liquid metal composite material of any one of claim 7, wherein the concentration of hydrochloric acid in the ethanol hydrochloric acid solution is 1 mol/L.
9. Use of a polydimethylsiloxane/liquid metal composite material of any one of claims 1 to 6 in the preparation of a magnetorheological stiffness joint.
10. The application of the polydimethylsiloxane/liquid metal composite material in the preparation of the magnetorheological stiffness joint according to claim 9, wherein the polydimethylsiloxane/liquid metal composite material further comprises two covers, the two covers are respectively covered at two ends of the shell and are in interference fit with a cylinder opening of the shell, and the cover is made of polydimethylsiloxane.
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| CN112388658A (en) * | 2020-11-16 | 2021-02-23 | 中国科学技术大学 | Flexible tongs based on liquid metal |
| CN113680524A (en) * | 2021-09-23 | 2021-11-23 | 大连海事大学 | Fe-PDMS composite material-based oil abrasive particle separation device and manufacturing method thereof |
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