Strain sensor and virtual keyboard based on liquid metal patterning technology

A strain sensor and liquid metal technology, which is used in the transmission of sensing components, instruments, graphic reading and other directions using electric/magnetic devices, which can solve the problems of complex sensors, inability to adapt quickly, and deviation, and overcome the problems of bulky, convenient and fast input. , the effect of good flexibility and tensile properties

Active Publication Date: 2022-07-26
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the data and information input by this method greatly deviates from the traditional input style, and cannot be adapted quickly, and the sensor part will appear complicated due to the limitation of the principle, which seriously limits its light and simple requirements. At the same time, the device will still be There is a rigid circuit board, which severely limits the flexibility of the device

Method used

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  • Strain sensor and virtual keyboard based on liquid metal patterning technology
  • Strain sensor and virtual keyboard based on liquid metal patterning technology
  • Strain sensor and virtual keyboard based on liquid metal patterning technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This example is used to illustrate the manufacturing method of the strain sensor of the present invention.

[0084]1 g of liquid indium gallium eutectic alloy (EGaIn Ga 75.5%wt In 24.5%wt) was placed in 1 ml of n-octanol solution, and sonicated for 60s at 30% amplitude with an ultrasonic cytometer to obtain a suspension of gray liquid metal. In the cloudy liquid, the metal was dispersed into small particles with an average particle diameter of 1500 nm. The inner core of the small particles is liquid metal, and the outside is wrapped by a thin oxide film. In order to achieve complete transfer, PET film was selected as the original pattern layer, and the PDMS solution was prepared according to the ratio of PDMS prepolymer: curing agent mass ratio of 10:1, and fully mixed with a homogenizer. Using the screen printing technique, such as figure 1 the graph shown. And the line width was measured with a high-definition video microscope, and the width was 200 μm. The patter...

Embodiment 2

[0087] This example is used to illustrate the manufacturing method of the strain sensor of the present invention.

[0088] Place 2 g of liquid indium gallium tin alloy (In(22)Ga(68)Sn(10)) in 1 ml of 1,4-butyrolactone and spin it with an electric grinder at maximum speed (sixth gear, 11600rpm) The liquid metal is sheared to obtain a liquid metal suspension, and the metal is dispersed into small particles with an average particle size of 2400 nm. The inner core of the small particles is liquid metal, and the outside is wrapped by a thin oxide film. In order to achieve complete transfer, glass is used as the original pattern layer, and the elastomer solution is prepared according to the mass ratio of Smooth-On Ecoflex 0030 A and B components of 1:1, and is fully mixed with a homogenizer. Wave-shaped sensor patterns were fabricated on glass using screen printing techniques. And the line width was measured with a high-definition video microscope, and the width was 150 μm. The p...

Embodiment 3

[0090] This example is used to illustrate the preparation method of the strain sensor patch of the present invention.

[0091] Prepare PDMS solution according to the ratio of PDMS prepolymer: curing agent mass ratio of 10:1, and add 5, 10, 15, 20 microliters of PEIE (ethoxylated polyethylenimine) to every 10 g of PDMS solution The solution was thoroughly mixed and poured onto the pattern of the dried PET film in Example 1. After defoaming in a vacuum oven at room temperature for 10 minutes, it was cured in an oven at 80 degrees Celsius for 2 hours. After the solution solidified, the PEIE-doped PDMS was carefully peeled off from the PET, and the desired liquid metal pattern was transferred onto the PEIE-doped PDMS. The PEIE-doped PDMS is inherently sticky and can fit tightly on gloves and skin. The higher the content of PEIE, the greater the viscosity of PDMS itself. And it has good electrical conductivity, and its resistance changes linearly with the increase of strain. A ...

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Abstract

The invention provides a strain sensor based on liquid metal patterning technology and a virtual keyboard thereof, as well as a preparation method and application thereof. The present invention uses the liquid metal patterning technology to manufacture the glove, the method is simple and feasible, and the mass production can be easily realized. The glove of the present invention can be worn on the hand, and can monitor the movements of the hand accurately in real time; further, it can be used as a virtual keyboard, which can realize the convenient and quick input of characters, and overcome the problems that the traditional keyboard is bulky and not easy to carry. The glove of the present invention adopts a fully flexible design, avoids rigid printed circuit boards, and has very good flexibility and tensile properties. The input style of the glove keyboard is close to the input method of the traditional QWERTY keyboard, so compared with the existing glove keyboard, it is easy to be accepted by the majority of consumers. The strain sensor of the present invention can be made into a patch and attached to each joint, so as to recognize the movements of the whole body.

Description

technical field [0001] The invention belongs to the field of electronic circuits, and in particular relates to a strain sensor based on liquid metal patterning technology and a virtual keyboard thereof, as well as a preparation method and application thereof. Background technique [0002] For a long time, the monitoring of movements has played an important role in the fields of medical treatment, machinery, and film industry. At present, the most common method for motion monitoring is to attach sensors to key points on the measured object, and use a set of cameras to recognize the motion. This method is very complicated and expensive, and requires large-scale equipment support. Another type of motion capture sensor is the resistive or capacitive type, which relies on changes in resistance or capacitance to identify movements that are attached to the joints. This kind of sensor is simple and lightweight, but the motion resolution is low. In most cases, it can only identify t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/16G06F3/01
CPCG06F3/014G01D5/16
Inventor 蒋兴宇唐立雪宓含冰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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