The external pressure applied on the liquid Ga metal must reach a certain value to make the liquid Ga metal exhibit fluidity, which will hinder the forming process.
However, liquid Ga metal has a very high surface tension (0.5–0.72 N m −1). Īs a metal with low melting point (melting point: 29.8☌), liquid Ga metal has the advantages of high conductivity (29 × 10 −6 Ω cm), low chemical activity, high fluidity (2.4 mPa s), and low toxicity.
Gallium-based liquid metals, with good mechanical properties and excellent conductivity, are a reliable choice for making flexible electronic equipment and flexible sensors. The rapid development on flexible substrates and liquid metals has largely enriched the field of the flexible sensors. For the flexible sensors, not only the functional requirements of products are important but also the flexibility and ductility requirements of electronic products are highly emphasized. presented a flexible pressure sensor constructed by three-dimensional polypyrene foam, which can detect carcinoembryonic antigen sensitively and rapidly. designed and developed a muscular monitoring patch, which has further development of multilayer biomonitoring applications. Flexible sensors have a wide range of applications in wearable sensors, health monitoring devices, and soft robotics. Flexible sensors, due to the flexibility, short response time, high sensitivity, and features of sensing the force on the surface of objects, have drawn extensive attention. Nowadays, the application environment of electronic products is becoming more and more complex. This work provides a specific reference for direct writing of liquid Ga metal and its sealing technology for the flexible sensor. The flexible sensor based on the sealed liquid Ga metal has good resilience under the external load. The advantages of piston mode are studied, and the direct writing parameters of the liquid Ga metal, including extrusion speed, nozzle height, printing speed, and nozzle inner diameter, are systematically optimized. In this paper, liquid Ga metal is directly written on the polyvinyl alcohol (PVA) film through the driving mode of piston extrusion then, the Ga metal wire is transferred and sealed with silica gel. Gallium (Ga) metal has become an ideal flexible conductive material due to its high conductivity, low melting point, and high flow characteristics. The tolerance band has been ignored.There is an urgent need for a simple and effective method to manufacture flexible sensors composed of liquid metal. Calculate the resistor values given by the bands shown below. The value of a resistor is given in ohms and is often referred to as its ‘resistance’. The bigger the value of a resistor the more it opposes the current flow. What is the resistor value?Ī resistor is a device that opposes the flow of electrical current. Used in metrology labs to calibrate ohmmeters, resistance bridges, etc. What is a standard resistor?Ī standard resistor is a resistor which is precise enough in value and stable enough in temperature coefficient to be used as a calibration standard. Last is the Gold band having tolerance value in 5% (0.05) from the table. From the table, the third orange band has value 1000. The Red band of the resistance value is 2 and the brown band of the resistance value is 1 from the table. How do identify resistor values?įirst Step. Frequently Asked Questions What are the most commonly used resistor values?
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