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A kind of artificial ferroelectric metamaterial and preparation method thereof

A metamaterial, ferroelectric technology, applied in the field of ferroelectric physics

Active Publication Date: 2019-01-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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However, the microscopic mechanism of this process is still under investigation

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  • A kind of artificial ferroelectric metamaterial and preparation method thereof
  • A kind of artificial ferroelectric metamaterial and preparation method thereof
  • A kind of artificial ferroelectric metamaterial and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1. Preparation of artificial ferroelectric metamaterials of polyvinylidene fluoride electret particles / castor oil system

[0033] The prepolarized polyvinylidene fluoride piezoelectric sheet (thickness 500 μm) was cut into a size of 100×100×500 μm by an automatic cutting machine 3 cubic electret particles, such as figure 1 shown. The dipole charges in the particles are aligned along the c-axis of the cube. Then the obtained electret particles were dispersed into castor oil, mechanically stirred until uniformly dispersed, and further ultrasonically treated in a water bath at room temperature for 30 minutes to obtain a suspension with good stability, which was the artificial ferroelectric metamaterial.

[0034] In the artificial ferroelectric metamaterial prepared in this example, the mass-volume concentration of the polyvinylidene fluoride electret particles is 10 mg / mL.

[0035] The artificial ferroelectric metamaterial prepared in this example was placed in ...

Embodiment 2

[0037] Embodiment 2, prepare the artificial ferroelectric metamaterial of tourmaline powder / castor oil system

[0038] 10000 mesh black tourmaline powder (such as image 3 As shown, the carried charges are space charges and dipole charges) dispersed into castor oil at a concentration of 50 mg / mL, and subjected to mechanical stirring and ultrasonic treatment in a normal temperature water bath for 30 min, to obtain artificial ferroelectric metamaterials.

[0039] Adopt the ferroelectric system to test the hysteresis loop of the artificial ferroelectric metamaterial prepared in this embodiment. During the test, the peak value of the alternating voltage is set to 1kV, and the frequency is 0.02Hz. The results are as follows Figure 4 It can be seen from the figure that the artificial ferroelectric metamaterial prepared in this embodiment has the property of polarization reversal.

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Abstract

The invention discloses a novel artificial ferroelectric metamaterial and a preparation method thereof. The artificial ferroelectric metamaterial is a turbid liquid formed by dispersing microparticles carrying equal quantities of unlike charges at two ends in a high-dielectric solvent; in the turbid liquid, the mass-volume concentration of the microparticles carrying equal quantities of unlike charges at two ends is 0-500 mg / mL, but is not equal to zero; the high-dielectric solvent is any one of castor oil, dimethyl silicone oil, transformer oil and carbon tetrachloride; the microparticles carrying equal quantities of unlike charges at two ends are made of an electret material or tourmaline. Turning of the microparticles (electric dipoles) of the artificial ferroelectric metamaterial in an alternating electric field can be directly observed, therefore, spontaneous polarization and polarization reversion of a ferroelectric can be further understood by researching the artificial ferroelectric metamaterial. The novel artificial ferroelectric metamaterial is expected to be applied to the field of physics study of the ferroelectric and preparation of a supernormal electromagnetic medium device.

Description

technical field [0001] The invention relates to a superstructure material and a preparation method thereof, in particular to an artificial ferroelectric supermaterial and a preparation method thereof, belonging to the field of ferroelectric physics. Background technique [0002] Metamaterial is a new concept that only appeared at the beginning of the 21st century. It has attracted extensive attention of researchers because of its extraordinary properties that materials in nature do not have. As a kind of artificial material, metamaterials are not derived from the material itself, but are determined by its artificial structure. More importantly, the study of metamaterials provides a new way of thinking about materials research: "new substances" with extraordinary physical properties that are completely different from natural substances can be artificially obtained without violating the basic laws of physics. [0003] Ferroelectrics are crystals in which spontaneous polarizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L91/00C08K3/38
CPCC08K3/38C08L27/16C08L91/00
Inventor 周济李状
Owner TSINGHUA UNIV