阅读说明：本技术 一种各向异性磁性纳米压电材料及其制备方法 (Anisotropic magnetic nano piezoelectric material and preparation method thereof ) 是由 王婷 蔡成龙 叶媛媛 俞陈辰 于 2021-06-23 设计创作，主要内容包括：本申请提供了一种各向异性磁性纳米压电材料及其制备方法,解决了现有技术中纳米压电材料对于具有方向的压力无法进行感知的技术问题。通过将四氧化三铁悬浮液与二甲基硅氧烷单体溶液进行混合,选用的材料简单,可控,在混合过程中不会产生废弃物；随后加入固化剂进行固化,涂覆至载玻片表面,经过磁化处理,使得涂覆在载玻片表面上的第二溶液的磁性粒子在磁场的作用下具有一定的方向性、然后干燥去除水分,获得各向异性磁铁纳米压电材料；采用该制备方法得到的各向异性磁铁纳米压电材料能够感知不同方向的压力。(The application provides an anisotropic magnetic nano piezoelectric material and a preparation method thereof, and solves the technical problem that the nano piezoelectric material cannot sense the pressure with the direction in the prior art. The ferroferric oxide suspension is mixed with the dimethyl siloxane monomer solution, the selected materials are simple and controllable, and no waste is generated in the mixing process; then adding a curing agent for curing, coating the curing agent on the surface of the glass slide, carrying out magnetization treatment to ensure that magnetic particles of a second solution coated on the surface of the glass slide have certain directionality under the action of a magnetic field, and then drying to remove moisture to obtain the anisotropic magnet nano piezoelectric material; the anisotropic magnet nano piezoelectric material prepared by the preparation method can sense the pressure in different directions.)

1. A preparation method of anisotropic magnetic nano piezoelectric material is characterized by comprising the following steps:

preparing ferroferric oxide suspension;

adding the ferroferric oxide suspension into a dimethyl siloxane monomer solution, and stirring for the first time to obtain a first solution;

adding a curing agent into the first solution, and stirring for the second time to obtain a second solution;

applying the second solution to a surface of a slide; and

and carrying out magnetization treatment on the second solution coated on the surface of the glass slide, and then drying to obtain the anisotropic magnet nano piezoelectric material.

2. The method of claim 1, wherein after adding a curing agent to the first solution and stirring for a second time to obtain a second solution, and before coating the second solution on the surface of the glass slide, the method further comprises:

carrying out ultrasonic treatment on the second solution for 3-7 minutes, wherein the ultrasonic intensity of the ultrasonic treatment is 35-60W;

wherein applying the second solution to the surface of the slide comprises:

applying the sonicated second solution to the surface of the slide;

magnetizing the second solution coated on the surface of the glass slide, and drying to obtain the anisotropic magnet nano piezoelectric material, wherein the anisotropic magnet nano piezoelectric material comprises:

and carrying out magnetization treatment on the second solution which is coated on the surface of the glass slide and is subjected to the ultrasonic treatment, and then drying to obtain the anisotropic magnet nano piezoelectric material.

3. The method of claim 2, wherein applying the sonicated second solution to the surface of the glass slide comprises:

spin coating the sonicated second solution to the slide surface.

4. The method for preparing anisotropic magnetic nano-piezoelectric material according to claim 3,

the rotation speed in the spin coating is as follows: 1200-1800 rpm, and the spin coating time is as follows: 50-70 seconds.

5. The method for preparing the anisotropic magnetic nano-piezoelectric material according to claim 2, wherein the time of the magnetization treatment is 2 to 8 hours, and the magnetic field intensity of the magnetization treatment is 300 to 500 gauss.

6. The method of claim 2, wherein in the step of drying the obtained anisotropic magnetic nano-piezoelectric material,

the drying temperature is 60-120 ℃, and the drying time is 1-6 hours.

7. The method for preparing the anisotropic magnetic nano piezoelectric material according to claim 3, wherein in the process of adding the ferroferric oxide suspension into the dimethyl siloxane monomer solution and stirring for the first time to obtain the first solution:

0.1 ml of the ferroferric oxide suspension is added to 0.1 to 2.1 ml of the dimethyl siloxane monomer solution.

8. The method for preparing anisotropic magnetic nano-piezoelectric material according to claim 3, wherein in the process of adding the curing agent into the first solution and stirring for the second time to obtain the second solution:

and adding 0.01-0.5 ml of the curing agent into the first solution.

9. The method for preparing the anisotropic magnetic nano piezoelectric material according to claim 3, wherein the step of preparing the ferroferric oxide suspension comprises the following steps:

adding 0.001-0.21 g of nano ferroferric oxide powder into 1ml of deionized water, stirring, and carrying out ultrasonic treatment for 1 hour to obtain the ferroferric oxide suspension.

10. The method of claim 9, wherein the mass of the nano Fe3O4 powder is 0.05 g.

11. The method for preparing an anisotropic magnetic nano-piezoelectric material according to claim 1, wherein the stirring speed of the first stirring is 300 to 800 rpm, and the stirring speed of the second stirring is 300 to 800 rpm.

12. An anisotropic magnetic nano-piezoelectric material, characterized by being prepared by the method for preparing an anisotropic magnetic nano-piezoelectric material according to any one of claims 1 to 11.

Technical Field

The application relates to the technical field of piezoelectric material preparation, in particular to an anisotropic magnetic nano piezoelectric material and a preparation method thereof.

Background

The flexible electronic and flexible piezoelectric device has the advantages of low cost and easiness in deployment, and provides a new driving force for the development of wearable and implantable technologies of the Internet of things. The piezoelectric nano material used by the flexible electronic and flexible piezoelectric device is a crystal material which generates voltage between two end faces when being subjected to pressure, and the crystal material is converted into electric energy according to external environments such as tiny sound, weak vibration and the like; due to the structural characteristics of the internal high-voltage electrode electric field, the energy conversion process is influenced by the physicochemical effects of the surface, the interface and the junction. For example, the nano material is gathered on the surface of the product, and the specific charge of the material reaches 788uC/m²The energy output is greatly increased; alternatively, piezoelectric materials are implanted in shoes, collecting energy for piezoelectricity as a person walks.

Most of the nano piezoelectric materials in the prior art are made of rigid metal materials, and in the using process, the pressure in the direction cannot be sensed, and the nano piezoelectric materials are easy to wear and cannot be used for a long time.

Disclosure of Invention

In view of this, the present application provides an anisotropic magnetic nano-piezoelectric material and a method for preparing the same, which solve the technical problem that the nano-piezoelectric material cannot sense the pressure having a direction in the prior art.

For the purpose of making the present application more apparent, its objects, technical means and advantages will be further described in detail with reference to the accompanying drawings.

According to one aspect of the present application, a method for preparing an anisotropic magnetic nano-piezoelectric material comprises: preparing ferroferric oxide suspension; adding the ferroferric oxide suspension into a dimethyl siloxane monomer solution, and stirring for the first time to obtain a first solution; adding a curing agent into the first solution, and stirring for the second time to obtain a second solution; applying the second solution to a surface of a slide; and carrying out magnetization treatment on the second solution coated on the surface of the glass slide, and then drying to obtain the anisotropic magnet nano piezoelectric material.

In one possible implementation, after the curing agent is added to the first solution and stirred for the second time to obtain the second solution, and before the second solution is coated on the surface of the glass slide, the preparation method further includes: carrying out ultrasonic treatment on the second solution for 3-7 minutes, wherein the ultrasonic intensity of the ultrasonic treatment is 35-60W; wherein applying the second solution to the surface of the slide comprises: applying the sonicated second solution to the surface of the slide; magnetizing the second solution coated on the surface of the glass slide, and drying to obtain the anisotropic magnet nano piezoelectric material, wherein the anisotropic magnet nano piezoelectric material comprises: and carrying out magnetization treatment on the second solution which is coated on the surface of the glass slide and is subjected to the ultrasonic treatment, and then drying to obtain the anisotropic magnet nano piezoelectric material.

In one possible implementation, applying the sonicated second solution to the slide surface includes: spin coating the sonicated second solution to the slide surface.

In one possible implementation, the rotation speed in the spin coating is: 1200-1800 rpm, and the spin coating time is as follows: 50-70 seconds.

In a possible implementation mode, the time of the magnetization treatment is 2-8 hours, and the magnetic field intensity of the magnetization treatment is 300-500 gauss.

In a possible implementation manner, in the drying to obtain the anisotropic magnet nano piezoelectric material, the drying temperature is 60-120 ℃, and the drying time is 1-6 hours.

In one possible implementation manner, during the process of adding the ferroferric oxide suspension to the dimethyl siloxane monomer solution and carrying out first stirring to obtain the first solution: 0.1 ml of the ferroferric oxide suspension is added to 0.1 to 2.1 ml of the dimethyl siloxane monomer solution.

In one possible implementation manner, during the process of adding the curing agent into the first solution and carrying out the second stirring to obtain the second solution: and adding 0.01-0.5 ml of the curing agent into the first solution.

In one possible implementation manner, the preparing the ferroferric oxide suspension comprises the following steps: adding 0.001-0.21 g of nano ferroferric oxide powder into 1ml of deionized water, stirring, and carrying out ultrasonic treatment for 1 hour to obtain the ferroferric oxide suspension.

In one possible implementation, the mass of the nano Fe3O4 powder is 0.05 grams.

In a possible implementation manner, the stirring speed of the first stirring is 300-800 rpm, and the stirring speed of the second stirring is 300-800 rpm.

As a second aspect of the present application, an anisotropic magnetic nano-piezoelectric material is prepared by the above method for preparing an anisotropic magnetic nano-piezoelectric material.

According to the anisotropic magnetic nano piezoelectric material and the preparation method thereof, the ferroferric oxide suspension is mixed with the dimethyl siloxane monomer solution, the selected material is simple and controllable, and no waste is generated in the mixing process; then adding a curing agent for curing, coating the curing agent on the surface of the glass slide, carrying out magnetization treatment to ensure that magnetic particles of a second solution coated on the surface of the glass slide have certain directionality under the action of a magnetic field, and then drying to remove moisture to obtain the anisotropic magnet nano piezoelectric material; the anisotropic magnet nano piezoelectric material prepared by the preparation method can sense the pressure in different directions.

Drawings

FIG. 1 is a process flow diagram of a method for preparing an anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 2 is a process flow diagram of another method for preparing an anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 3 is a process flow diagram of another method for preparing an anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 4 is a process flow diagram illustrating another method for fabricating an anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 5 is a process flow diagram illustrating another method for fabricating anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 6 is a process flow diagram illustrating another method for fabricating anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 7 is a process flow diagram illustrating another method for fabricating anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 8 is a process flow diagram illustrating another method for fabricating anisotropic magnetic nano-piezoelectric material according to the present application;

FIG. 9 is a diagram illustrating an analysis of an anisotropic magnetic nano-piezoelectric material provided herein;

FIG. 10 is a diagram illustrating an analysis of an anisotropic magnetic nano-piezoelectric material provided herein;

FIG. 11 is a diagram illustrating an analysis of an anisotropic magnetic nano-piezoelectric material provided herein;

fig. 12 is a diagram illustrating an analysis of an anisotropic magnetic nano-piezoelectric material provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 shows a process flow diagram of a method for preparing an anisotropic magnetic nano-piezoelectric material, which is provided by the present application, and as shown in fig. 1, the method comprises:

step S100, preparing ferroferric oxide suspension;

step S100, adding water into nano ferroferric oxide powder to obtain ferroferric oxide suspension;

step S200, adding the ferroferric oxide suspension into a dimethyl siloxane monomer solution, and stirring for the first time to obtain a first solution;

step S200, mixing and stirring the ferroferric oxide suspension obtained in the step S100 and a dimethyl siloxane monomer solution until the mixture is uniform to obtain a first solution;

step S300, adding a curing agent into the first solution, and stirring for the second time to obtain a second solution;

step S300, adding a curing agent into the first solution obtained in the step S200, uniformly stirring, and curing to obtain a second solution;

step S400, coating the second solution on the surface of the glass slide;

step S400, coating the second solution obtained in step S300 on the surface of the glass slide for molding;

step S500, carrying out magnetization treatment on the second solution coated on the surface of the glass slide, and then drying to obtain the anisotropic magnet nano piezoelectric material;

and step S500, carrying out magnetization treatment on the second solution coated on the surface of the glass slide in the step S400 to enable magnetic particles in the solution to have certain directionality under the action of a magnetic field, and then drying to remove moisture to obtain the anisotropic magnet nano piezoelectric material.

According to the preparation method of the anisotropic magnetic nano piezoelectric material, the ferroferric oxide suspension is mixed with the dimethyl siloxane monomer solution, the selected material is simple and controllable, and no waste is generated in the mixing process; then adding a curing agent for curing, coating the curing agent on the surface of the glass slide, carrying out magnetization treatment to ensure that magnetic particles of a second solution coated on the surface of the glass slide have certain directionality under the action of a magnetic field, and then drying to remove moisture to obtain the anisotropic magnet nano piezoelectric material; the anisotropic magnet nano piezoelectric material prepared by the preparation method can sense the pressure in different directions.

In a possible implementation manner, fig. 2 is a process flow diagram of a preparation method of another anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 2, after step S300 (adding a curing agent to a first solution, and performing second stirring to obtain a second solution), and before step S400 (coating the second solution on the surface of a glass slide), the preparation method further includes:

s600, carrying out ultrasonic treatment on the second solution for 3-7 minutes, wherein the ultrasonic intensity of the ultrasonic is 35-60W;

step S600, carrying out ultrasonic treatment on the second solution, wherein small particles in the liquid can be reduced, so that the uniformity and the stability of the second solution are improved;

step S400 (applying the second solution to the surface of the slide), specifically includes the following steps:

step S401, coating the second solution subjected to ultrasonic treatment on the surface of the glass slide;

step S500 (magnetizing the second solution coated on the surface of the slide, and then drying to obtain the anisotropic magnet nano piezoelectric material), specifically includes the following steps:

and step S501, carrying out magnetization treatment on the second solution which is coated on the surface of the glass slide and is subjected to ultrasonic treatment, and then drying to obtain the anisotropic magnet nano piezoelectric material.

The solution is subjected to ultrasonic treatment in the processes of step S300 and step S400, so that small particles in the liquid can be reduced, and the liquid in the preparation process is more uniform and stable.

In one possible implementation manner, fig. 3 is a process flow diagram of a method for preparing another anisotropic magnetic nano-piezoelectric material provided in the present application, as shown in fig. 3, step S401 (applying the second solution subjected to the ultrasonic treatment to the surface of the glass slide) specifically includes the following steps:

step S4011, rotationally coating the second solution subjected to ultrasonic treatment on the surface of the glass slide;

step S4011 is a step of enabling the second solution to be uniformly coated on the surface of the slide glass by using a spin coating method using a centrifugal force generated by rotation;

optionally, the rotation speed in spin coating is: 1200-1800 rpm, and the spin coating time is as follows: 50-70 seconds; so that the second solution can be more uniformly and smoothly coated on the surface of the glass slide.

More specifically, the rotation speed at the time of spin coating may be 1200 rpm, 1300 rpm, 1400 rpm, 1500 rpm, 1600 rpm, 1700 rpm, 1800 rpm, and any value therebetween; more preferably, the spin coating is performed at a spin speed of 1600 rpm.

More specifically, the time at the time of spin coating may be 50 seconds, 60 seconds, 70 seconds, and any value therebetween.

In a possible implementation manner, fig. 4 is a process flow diagram of another method for preparing an anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 4, during step S500 (performing magnetization treatment on the second solution coated on the surface of the glass slide, and then drying to obtain the anisotropic magnetic nano-piezoelectric material), the method specifically includes the following steps:

step S502, carrying out magnetization treatment on the second solution coated on the surface of the glass slide for 2-8 hours, wherein the magnetic field intensity of the magnetization treatment is 300-500 Gauss, and then drying to obtain the anisotropic magnet nano piezoelectric material;

step S502 is to adopt the magnetization processing time and the magnetic field intensity to ensure that the magnetic particles of the second solution coated on the surface of the glass slide have certain directionality under the action of the magnetic field;

more specifically, the time of the magnetization processing in step S502 may be 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, and any value therebetween;

the magnetic field strength of the magnetization process is 300 gauss, 400 gauss, 500 gauss, and any value therebetween.

In a possible implementation manner, fig. 5 is a process flow chart of another method for preparing an anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 5, during step S500 (performing magnetization treatment on the second solution coated on the surface of the glass slide, and then drying to obtain the anisotropic magnetic nano-piezoelectric material), the method specifically includes the following steps:

step S503, carrying out magnetization treatment on the second solution coated on the surface of the glass slide for 2-8 hours, wherein the magnetic field intensity of the magnetization treatment is 300-500 gausses, and then drying at the temperature of 60-120 ℃ for 1-6 hours to obtain the anisotropic magnet nano piezoelectric material;

step S503 is that the drying temperature and time are adopted, so that the moisture of the anisotropic magnet nano piezoelectric material can be removed, and the pressure in different directions can be sensed;

more specifically, the drying temperature in step S503 is 60 degrees celsius, 70 degrees celsius, 80 degrees celsius, 90 degrees celsius, 100 degrees celsius, 110 degrees celsius, 120 degrees celsius, or any value therebetween; the drying time is 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, and any number therebetween.

In a possible implementation manner, fig. 6 is a process flow diagram of a preparation method of another anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 6, step S200 (adding a ferroferric oxide suspension to a dimethylsiloxane monomer solution, and performing first stirring to obtain a first solution) specifically includes the following steps:

step S201, adding 0.1 ml of ferroferric oxide suspension into 0.1-2.1 ml of dimethyl siloxane monomer solution, and stirring for the first time to obtain a first solution;

step S201 is to limit the volume ratio of the ferroferric oxide suspension to the dimethyl siloxane monomer solution, so that the material is controllable, the generation of waste is prevented, the material is saved, and the cost is reduced;

wherein the stirring speed of the first stirring is 300-800 r/min;

more specifically, the methyl siloxane monomer solution added in step S201 has a volume of 0.1 ml, 0.2 ml, 0.3 ml, 0.4 ml, 0.5ml, 0.6 ml, 0.7 ml, 0.8 ml, 0.9 ml, 1.0 ml, 1.1 ml, 1.2 ml, 1.3 ml, 1.4 ml, 1.5 ml, 1.6 ml, 1.7 ml, 1.8 ml, 1.9 ml, 2.0 ml, 2.1 ml and any value therebetween;

more specifically, the stirring speed of the first stirring may be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, and any value therebetween.

In a possible implementation manner, fig. 7 is a process flow diagram of a preparation method of another anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 7, in step S300 (adding a curing agent to the first solution, performing second stirring to obtain a second solution), the method specifically includes the following steps:

step S301, adding 0.01-0.5 ml of curing agent into the first solution, and stirring for the second time to obtain a second solution;

step S301, limiting the proportion of the curing agent to the first solution to enable the curing state of the solution to be moderate, and further saving materials;

wherein the stirring speed of the second stirring is 300-800 revolutions per minute;

more specifically, the volume of the curing agent in step S301 may be 0.01 ml, 0.1 ml, 0.2 ml, 0.3 ml, 0.4 ml, 0.5ml, and any value therebetween;

more specifically, the stirring speed of the second stirring may be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, and any value therebetween.

In a possible implementation manner, fig. 8 is a process flow chart of a preparation method of another anisotropic magnetic nano-piezoelectric material provided in the present application, and as shown in fig. 8, step S100 (preparing a ferroferric oxide suspension) specifically includes the following steps:

step S101, adding 0.001-0.21 g of nano ferroferric oxide powder into 1ml of deionized water, stirring, and carrying out ultrasonic treatment for 1 hour to obtain the ferroferric oxide suspension; the obtained ferroferric oxide suspension is more uniform and dispersed;

more specifically, the mass of the nano ferroferric oxide powder in the step S101 may be 0.001 g, 0.01g, 0.05g, 0.1g, 0.15 g, 0.2 g, 0.21 g, or any value therebetween;

preferably, the mass of the nano ferroferric oxide powder is 0.05 g.

The following will further explain the method for producing the anisotropic magnetic nano-piezoelectric material provided in the present application by using specific examples, the conditions in these examples are one example of conditions used to confirm the applicability and effects of the present application, and the present application is not limited to these examples.

(example 1)

Deionized water is taken as a solvent, 1ml of deionized water is taken, and 0.01g of nano ferroferric oxide (Fe) is added₃O₄) Powder is treated by ultrasonic for 1 hour to obtain ferroferric oxide (Fe)₃O₄) A suspension; then adding 1ml of (dimethyl siloxane) PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 300 r/min, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the solution is uniform, wherein the stirring speed is 300 r/min, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 4 hours under the condition that the magnetic field intensity is 300 gauss, and then putting the magnetic field intensity into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

(example 2)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.05g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 1ml of PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 500 r/min, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the mixture is uniform, wherein the stirring speed is 500 revolutions per minute, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; then magnetizing the mixture under the condition of 500 gauss of magnetic field intensity 4And (3) putting the mixture into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

Analyzing the obtained anisotropic magnet nano piezoelectric material, wherein fig. 9 and 10 are used for performing a piezoelectric performance test on the obtained anisotropic magnet nano piezoelectric material on a blood vessel of a mouse, magnetic lines of force of the anisotropic magnet nano piezoelectric material shown in fig. 9 are parallel to the blood vessel, and magnetic lines of force of the anisotropic magnet nano piezoelectric material shown in fig. 10 are perpendicular to the blood vessel; FIG. 11 is a general view of an anisotropic magneto-nano-piezoelectric material having clearly visible magnetic lines of force; the anisotropic magnet nano-piezoelectric material of fig. 12 has a change in voltage under the bending force of the perpendicular and parallel magnet wires.

(example 3)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.1g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 1ml of PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 800 revolutions per minute, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the solution is uniform, wherein the stirring speed is 800 revolutions per minute, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 4 hours under the condition that the magnetic field intensity is 400 gauss, and then putting the magnetic field intensity into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

In examples 1-3, we prepared anisotropic magnetic nano-piezoelectric materials with the mass of nano-Fe 3O4 powder as variable to obtain the optimal mass of nano-Fe 3O4 powder for preparing the material. Anisotropic magnetic nano-piezoelectric materials were prepared from nano-Fe 3O4 powders with mass of 0.01g, 0.05g and 0.1g according to the above preparation method.

The results of the experiments are summarized below:

(example 4)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.05g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 0.5ml of PDMS monomer solution, and stirring uniformly for the first time at a stirring speed of 800 rpm to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time until the mixture is uniform, wherein the stirring speed is 800 revolutions per minute, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 4 hours under the condition that the magnetic field intensity is 500 gauss, and then putting the mixture into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

(example 5)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.05g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 2ml of PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 600 revolutions per minute, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the solution is uniform, wherein the stirring speed is 600 revolutions per minute, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 4 hours under the condition that the magnetic field intensity is 350 gauss, and then putting the mixture into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

In examples 2, 4, 5, the anisotropic magnetic nano-piezoelectric material was prepared with the volume of PDMS solution as a variable to obtain the volume of PDMS solution optimal for preparing the material; with the volume of 0.5mL, 1mL and 2mL of nano Fe₃O₄The powder is prepared into the anisotropic magnetic nano piezoelectric material according to the preparation method。

The results of the experiments are summarized below:

(example 6)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.05g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 1ml of PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 400 r/min, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the solution is uniform, wherein the stirring speed is 400 r/min, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 2 hours under the condition that the magnetic field intensity is 500 gauss, and then putting the magnetic field intensity into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

(example 7)

Taking deionized water as a solvent, taking 1ml of deionized water, and adding 0.05g of nano Fe₃O₄Powder, ultrasonic treatment for 1 hour to obtain Fe₃O₄A suspension; then adding 1ml of PDMS monomer solution, and stirring for the first time until the mixture is uniform, wherein the stirring speed is 700 revolutions per minute, so as to obtain a first solution; adding 0.1 ml of curing agent into the first solution, and stirring for the second time till the solution is uniform, wherein the stirring speed is 700 revolutions per minute, so as to obtain a second solution; sonicating the second solution for 5 minutes; 0.5ml of the second solution after ultrasonic treatment is dripped on a spin coater and rotated for 60 seconds at 1600 revolutions per minute; and then carrying out magnetization treatment for 8 hours under the condition that the magnetic field intensity is 400 gauss, and then putting the magnetic field intensity into a 90 ℃ oven to react for 4 hours to obtain the anisotropic magnet nano piezoelectric material.

In examples 2, 6, and 7, anisotropic magnetic nano-piezoelectric materials were prepared with the volume of PDMS solution as a variable to obtain the optimal strong magnetic standing time for preparing the materials. The standing time of 2h, 4h and 8h is taken as the preparation method for the anisotropic magnetic nano piezoelectric material.

The results of the experiments are summarized below:

as a second aspect of the present application, an anisotropic magnetic nano-piezoelectric material is prepared by a method for preparing an anisotropic magnetic nano-piezoelectric material, and the prepared anisotropic magnetic nano-piezoelectric material can sense different pressure directions, is not easy to lose, and can be used for a long time.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.