Harmonic method based hydrogel thermal conductivity testing device and method

Abstract

The invention belongs to the technical field of material thermal conductivity measurement and discloses a harmonic method based hydrogel thermal conductivity testing device. The hydrogen thermal conductivity testing device comprises a detector, a precision resistance box, a signal generator, voltage followers and a phase-locking amplifier; the detector comprises a container, a support plate, an electrode and metal heating wires, the support plate is placed at the top of the container, the electrode is installed on the support plate and includes multiple copper bars, and lower ends of the copper bars are connected through the metal heating wires; the copper bar a is connected with the signal generator, both the copper bar b and the copper bar c are connected with the first voltage follower,the copper bar d is connected with the precision resistance box, the precision resistance box is connected with the second voltage follower and the signal generator, and the first voltage follower and the second voltage follower are connected with the phase-locking amplifier. By the arrangement, thermal conductivity of hydrogel can be measured through the harmonic method accurately and conveniently.

Description

technical field [0001] The invention belongs to the technical field of measuring thermal conductivity of materials, and more particularly relates to a device and method for testing the thermal conductivity of hydrogel by harmonic method. Background technique [0002] Hydrogels are macroscopic macromolecular materials composed of cross-linked polymer networks containing a large amount of water (70-99 wt%). The main component of our human body is a hydrogel. Hydrogels are considered to be the best materials for the fabrication of next-generation flexible / wearable electronic devices due to their flexibility, mechanical reliability, and biocompatibility. There are many inspiring examples in this regard, such as stretchable transparent touchscreens based on ionic hydrogels, steerable smart catheter tips based on flexible hydrogels, dual-network hydrogel optical fibers for strain sensors, etc. As we all know, the heat dissipation of electronic devices seriously affects their per...

AI Technical Summary

Problems solved by technology

However, the existing harmonic method is not suitable for measuring flexible materials with high water content such as hydrogels, mainly because it is difficult to plate metal wires on the surface of such materials

In addition, due to the need to plate metal wires or use other methods to make detectors, the existing methods have complicated manufacturing processes, relatively high costs, and have more requirements for samples.

Images