A flexoelectric electret with adjustable flexoelectric effect and preparation method thereof
A flexoelectric effect and flexoelectric technology, applied in the direction of electret, can solve the problems of low flexoelectric coefficient, easy breakage, incompatibility of flexibility and flexoelectric coefficient, etc., and achieve simple and easy process Effect
Active Publication Date: 2020-08-14
XI AN JIAOTONG UNIV
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Problems solved by technology
However, flexibility and flexoelectricity are often incompatible
Ceramic materials have a large flexoelectric coefficient (10 -4 C / m), but it is not flexible and easily breaks
The most widely studied polymer, polyvinylidene fluoride (PVDF), is flexible but has a low flexoelectric coefficient (1.3×10 -8 C / m)
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[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific examples, but it is not intended to limit the present invention.
[0026] Such as figure 1 As shown, the present invention has a flexible electroelectret with adjustable flexoelectric effect, comprising two layers of polymer matrix 1 and one layer of polymer charged film 2, and the two layers of polymer matrix 1 will be a layer The charged polymer film 2 is sandwiched in the middle to form an integral sandwich structure.
[0027] Such as figure 2 As shown, a PTFE film with a thickness of 30 μm is selected, and it is charged by the corona polarization method to make it carry negative charges on the surface. The corona charging voltage is controlled at -10kV, the distance between the electrode and the membrane is 7cm, the charging temperature is at room temperature, and the charging time of different samples is 5s, 20s, 1min, 3min, 5min, in order to obtain...
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Abstract
The invention discloses a flexoelectric electret with a controllable flexoelectric effect and a preparation method of the electrets. A static charge layer is embedded into a polymer matrix. A polymerfilm in the thickness between 1 micron to 1mm is used, and the film is polarized by corona or contact charging so that the film carries surface charges; and the film is pasted into the two-layer polymer matrix to form a polymer matrix-polymer live film-polymer matrix sandwich structure, namely the needed flexoelectric electrets. The obtained flexoelectric electrets has an extremely high flexoelectric effect, it is proved that the effect is linearly related to the charge intensity and thickness of a sample, and the electrets is controllable; and the material preparation method is simple, large-scale production is easy to realize, and the method can be applied to the fields including energy capturing, flexible sensors, artificial skin and self-power equipment.
Description
technical field [0001] The invention belongs to the field of functional materials, and mainly relates to proposing a flexoelectric electret with adjustable flexoelectric effect and a preparation method thereof. Background technique [0002] The flexoelectric effect is an emerging electromechanical coupling mechanism, which exists in all dielectric materials, such as ceramic crystals, liquid crystal materials, biofilms, polymers, etc. The flexoelectric effect manifests itself in the electrical polarization of a dielectric material by a strain gradient, or the deformation of a material by an electric field gradient. Since the flexoelectric effect exists in all dielectric materials, it is considered to be a promising alternative to the piezoelectric effect to find more environmentally friendly electromechanical coupling materials. [0003] Soft materials have the advantages of flexibility, biocompatibility, and easy integration into flexible electronic devices. They are candid...
Claims
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IPC IPC(8): H01G7/02
Inventor 文馨谭楷邓谦申胜平
Owner XI AN JIAOTONG UNIV