Method for preparing liquid metal strain sensor and liquid metal strain sensor

Abstract

The invention provides a method for preparing a liquid metal strain sensor, and the method comprises the following steps: S1, preparing an embedded body: winding the embedded body with a solidified liquid metal wire; S2, preparing a cuboid mold with a main groove, arranging a boss in the middle of the groove bottom of the main groove, forming sub-grooves in the two sides of the groove bottom of the main groove, filling the sub-grooves with liquid first silica gel, and after the first silica gel being solidified, filing the groove bottom of the main groove with liquid second silica gel and solidifying; S3, putting the sensor main body into the main groove of the sensor shell; and S4, melting the solidified liquid metal wire. The invention also provides a liquid metal strain sensor. The method has the advantages that the sensor prepared through the method is not prone to failure, the problem that the sensor is prone to failure due to the fact that a rigid embedded body is adopted at present to improve the sensitivity of the liquid metal strain sensor is solved, and therefore the stability of the sensor in the service process is improved.

Description

technical field [0001] The invention relates to a liquid metal strain sensor, in particular to a method for preparing a liquid metal strain sensor and the liquid metal strain sensor. Background technique [0002] Liquid metal refers to an amorphous metal, and liquid metal can be regarded as a mixture composed of positive ion fluid and free electron gas. Liquid metal is also an amorphous, flowing liquid metal. [0003] The mold prepared by photolithography constructs microchannels inside elastic silicone such as PDMS / Ecoflex, and injects liquid metal into the microchannels to prepare liquid metal flexible strain sensors. In order to prepare high-performance strain sensors, most of the current multi-material synchronous 3D printing methods are used to print rigid PVA degradable materials to construct liquid metal channels. The cube printed by rigid PLA non-degradable materials is located above the channel, and the printed PVA liquid metal channel and PLA cube The module is e...

AI Technical Summary

Problems solved by technology

The liquid metal strain sensor prepared by 3D printing + degradation method, because the rigid PLA cube is embedded in the elastic body, when the strain sensor bears a large (>50%) strain, a gap is formed at the interface between the rigid PLA cube and the elastic silicone, and the liquid metal enters the gap to thereby lead to sensor failure

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