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Surface wave time-frequency regulated localized heterogeneous composite material preparation device and method

A composite material and a technology for preparing devices, which can be used in devices for coating liquids on surfaces, pretreatment surfaces, coatings, etc., can solve problems such as poor regional selectivity, and achieve the effect of enhancing diversity

Active Publication Date: 2020-08-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of poor regional selectivity in the preparation of heterogeneous composite materials assisted by surface acoustic waves, the patent of the present invention proposes a localized heterogeneous composite material preparation device and method based on surface wave video control

Method used

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  • Surface wave time-frequency regulated localized heterogeneous composite material preparation device and method
  • Surface wave time-frequency regulated localized heterogeneous composite material preparation device and method
  • Surface wave time-frequency regulated localized heterogeneous composite material preparation device and method

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preparation example Construction

[0031] In order to realize the preparation of localized heterogeneous composite materials, a pair of frequency-variable surface acoustic wave transducers 2 can be slanted fingers or arc fingers. If a pair of frequency-variable surface acoustic wave transducers 2 are oblique fingers, such as figure 1 As shown, a pair of frequency-variable interdigital transducers should be symmetrically distributed on the lithium niobate wafer 1 . If the pair of frequency-variable surface acoustic wave transducers 2 are arc fingers, the centers of the curvature radii of the pair of frequency-variable interdigital transducers 2 should coincide with one point and be symmetrically distributed with respect to the center of this point. The above structural design can ensure that a pair of frequency-variable surface acoustic wave transducers 2 are excited to generate surface acoustic waves of different frequencies, which can be superimposed in the central area of ​​a pair of frequency-variable surfac...

example 1

[0039] Example 1: Distribution range characteristics of surface acoustic standing waves based on frequency regulation of surface acoustic waves

[0040] Such as figure 2 Shown is a pair of oblique-fingered frequency-variable surface acoustic wave transducers, which can be regarded as figure 1 The top view of the device without the liquid tank 3 and the mixture 5. According to the principle of the surface acoustic wave transducer, the excitation frequency of the transducer corresponds to the finger width, which is f=c / 4m, and c is the sound velocity of the lithium niobate wafer 1 parallel to the finger width direction of the variable frequency surface acoustic wave transducer 2, m is the finger width (or finger spacing) of a pair of oblique finger variable frequency SAW transducers. Since the finger width of the variable frequency SAW transducer varies, the adjustment range of the excitation frequency is f min max , the minimum frequency f min Corresponding to the point wit...

example 2

[0044] Example 2: Distribution range characteristics of surface acoustic standing waves based on time regulation of surface acoustic waves

[0045] For convenience, the two-dimensional case is analyzed, namely figure 2 The surface wave propagation characteristics of the time-regulated sinusoidal signal input to the frequency-variable surface acoustic wave transducer 2 along the horizontal midline section. A time-regulated input signal such as image 3 As shown, V 1 with V 2 are the input signals of a pair of surface acoustic wave transducers, respectively. where t 1 It is a sinusoidal signal in time and zero input signal input in time t2, V 1 with V 2 The signal is exactly the same in each cycle but there is a relative time difference t c . The period of the sinusoidal signal should correspond to the excitation frequency of the frequency-variable surface acoustic wave transducer 2 at a specific position. let t m is the time taken for the surface acoustic wave to pro...

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Abstract

The invention discloses a surface wave time-frequency regulated localized heterogeneous composite material preparation device and method. The method comprises the steps as follows: functional particles, a photosensitive liquid and a photoinitiator are uniformly mixed, and periodic time-frequency control sinusoidal signals with frequency, duration, intermittent time and time difference are gradually input to a pair of variable-frequency surface acoustic wave transducers, so that the pair of variable-frequency surface acoustic wave transducers are excited to generate corresponding acoustic surface standing waves, the waves are coupled into a liquid tank to form a localized sound field in the photosensitive liquid, and the functional particles in the photosensitive liquid are subjected to acoustic radiation of the localized sound field to form stable array distribution; an ultraviolet light source is turned on for curing to complete manufacturing. Localized sound field distribution is achieved in the liquid tank, preparation of corresponding localized heterogeneous composite materials is achieved, and the problem of poor regional selectivity in surface acoustic wave assisted preparation of the heterogeneous composite materials is solved.

Description

technical field [0001] The invention relates to rapid preparation technology, in particular to a device and method for preparing localized heterogeneous intelligent composite materials based on surface wave time-frequency regulation. Background technique [0002] Smart composite material components are a new type of material system that integrates perception, control, and execution functions. The functional particles in the components can sense changes in external factors such as heat, light, electricity, magnetism, and stress, and make materials produce expectations according to the change information. In response, the final control component realizes dynamic adjustment. The composition of intelligent composite components can be divided into two parts: matrix material and functional medium. The matrix material determines the geometry of the component and plays the role of bearing external loads; the functional medium is usually a simple substance or compound with specific p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C9/12B05C11/02B05D7/24B05D3/06
CPCB05C9/12B05C11/023B05D7/24B05D3/067B29C35/0805B29C2035/0827B29K2083/00B29K2105/16B29C2791/008B29C35/0261B29C70/62B29C2033/0005H03H9/02559H03B5/326
Inventor 汪延成韩晨阳梅德庆许诚瑶
Owner ZHEJIANG UNIV
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