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Multiferroic liquid and preparation method thereof

A multiferroic and liquid technology, applied in the direction of magnetic liquid, can solve the problems of large coercive force, material waste, weak effect and no obvious change, and achieve the effect of simple preparation

Inactive Publication Date: 2015-11-25
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Solid multiferroic materials have the following disadvantages: 1. The coercive force of solid multiferroic materials is relatively large. When using magnetic or electric fields to regulate magnetism or ferroelectricity, the required magnetic or electric fields are relatively large; 2. .When studying the magnetoelectric coupling effect, it is found that the effect is relatively weak and the change is not obvious; 3. The application of a large electric field is easy to damage the multiferroic material, resulting in material waste; 4. Once the multiferroic material is formed, it cannot be changed

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  • Multiferroic liquid and preparation method thereof

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0034] A multiferroic liquid comprising multiferroic nanoparticles, a base fluid and a surfactant. The inside of the nanoparticle is a ferroelectric material that constitutes the core of the nanoparticle, and the ferroelectric material is preferably barium titanate (BTO) or lead zirconate titanate (PZT) (those skilled in the art should know that other ferroelectric properties can also be used. material); the outer surface of the ferroelectric material is completely wrapped by the magnetic material to form the shell of the nanoparticle, and the magnetic material is preferably ferric oxide (Fe 3 o 4 ), cobalt ferrite (CoFe 2 o 4 , abbreviated as CFO) or γ-Fe 2 o 3(Those skilled in the art will know that other magnetic materials can also be used), multiferroic nanoparticles forming an electro-magnetic core-shell structure. The base liquid and the sur...

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Abstract

The invention discloses a multiferroic liquid and a preparation method thereof, and aims at solving the defects that a solid multiferroic material is large in coercive force; the structure cannot be changed once the solid multiferroic material is formed; the magnetoelectric coupling effect is weak; and the solid multiferroic material is easily broken down by voltage. The multiferroic liquid is a stable suspension liquid which is formed by evenly dispersing nano particles with an electric-magnetic core-shell structure, which are formed by wrapping the outer surface of an internal ferroelectric material with a magnetic material, into a mixed liquid of a base liquid and a surfactant. The multiferroic liquid disclosed by the invention not only has ferroelectricity and magnetism, but also has liquidity and relatively small coercive force; and the lengths and the thicknesses of nanochains formed by the nano particles in the multiferroic liquid can be adjusted by applying different electric fields or magnetic fields to the multiferroic liquid according to the requirements, so that the characteristics of the multiferroic liquid in electricity, magnetics, fluid mechanics, optics and acoustics are adjusted. The invention provides the concept of the multiferroic liquid for the first time, and provides a preparation method. A new research direction is opened up for research of multiferroic materials.

Description

technical field [0001] The invention belongs to the field of multiferroic materials, and in particular relates to a multiferroic liquid and a preparation method thereof. Background technique [0002] In 1994, Schmid in Switzerland clearly proposed the concept of multiferroic materials. Multiferroic materials (mutliferroic) refer to the basic properties of two or more types of iron in the same phase of the material. These basic properties of iron include iron Electricity (antiferroelectricity), ferromagnetism (antiferromagnetism, ferrimagnetism) and ferroelasticity. This kind of material has both spontaneous polarization order and spin order at a certain temperature. It is the magnetoelectric coupling effect caused by their simultaneous existence that makes multiferroics have some special physical properties and triggers several new , Significant physical phenomena, such as: generating electric polarization or inducing ferroelectric phase transition under the action of a mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
Inventor 陈刚高荣礼符春林蔡苇邓小玲
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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