An alloy of liquid metal such as gallium not only has its own fluidity at normal temperature, but also current can flow therein, and is an ideal material for stretchable devices and circuits. However, liquid metal has a large surface energy (difficult to spread), and its surface spontaneously forms an insulating oxide film, which makes printing of liquid metal on various substrates always a problem. In order to overcome the surface energy of liquid metal and efficiently break the oxide film on the surface of liquid metal particles, Jiang Xingyu's group used liquid metal particle printing-polymer casting-polymer stripping method to obtain a highly conductive, highly elastic liquid metal. Polymer complex. On the surface of the composite, the "island" of the liquid metal is distributed in the "ocean" of the polymer. The "island" of the liquid metal realizes the connection with the external device; and inside the composite, the liquid metal "the river extends in all directions". The river guarantees high electrical conductivity and high elasticity of the composite. The entire preparation process can be carried out at room temperature to avoid damage to the polymer substrate by high temperature. The team of Jiang Xingyu printed the composite on a flexible silicone substrate to create a highly flexible circuit that would not fail under extreme strain conditions (>500%). They also printed the composite on latex gloves to make keyboard gloves that not only monitor hand movements, but also enable character entry. The team of Jiang Xingyu further developed the composite into an electrotransfected bioelectrode to achieve efficient transfection of living cell genes. The research is expected to greatly increase the flexibility of the circuit, reduce the manufacturing cost of flexible stretchable circuits, and promote the development and application of new fields such as wearable devices, implantable devices, and flexible robots. The research was supported by the National Natural Science Foundation of China and the Ministry of Science and Technology of the People's Republic of China. Paper link: https://(18)30068-3 FC connector Waterproof Fiber Pigtail,Waterproof Pigtail,Fiber Optic Component,Waterproof Fiber Optic Pigtail,Waterproof,Optic Fiber communication systems Shenzhen GL-COM Technology CO.,LTD. , https://www.szglcom.com
FC is one of the most common connection devices in single-mode networks. It also uses a 2.5 mm ferrule, but some of the early FC connectors are designed with ceramics built into the stainless steel ferrule. FC has been replaced by SC and LC connectors in most applications.
FC is the abbreviation of Ferrule Connector, indicating that its external reinforcement is a metal sleeve, and the fastening method is a turnbuckle. The round threaded connector is a metal connector, and the metal connector can be plugged in more times than plastic. Generally used in telecommunications networks, a screw cap is screwed onto the adapter.
Advantages: Reliable and dustproof.
Disadvantage: Slightly longer installation time.
SC connector
SC also has a 2.5mm ferrule. Unlike ST/FC, it is a pluggable device and is widely used because of its excellent performance. It is a connector standardized by TIA-568-A, but it was not widely used in the early stage due to its high price (twice the price of ST).
The full English name of SC is sometimes referred to as "Square Connector", because the shape of SC is always square.
The shell is rectangular, and the structure size of the pin and coupling sleeve is exactly the same as that of the FC type. Among them, the end face of the pin mostly adopts the PC or APC grinding method; the fastening method is the plug-in bolt type, without rotation.
Advantages: Standard square connector, direct plugging and unplugging, easy to use. Using engineering plastics, high temperature resistance, not easy to oxidize.
Disadvantages: The connector is easy to fall out.
Recently, Jiang Xingyu, a researcher at the National Nanoscience Center of the Chinese Academy of Sciences, has developed a method for manufacturing flexible electronic devices on a large scale in combination with microfluidics and liquid metal. It can be used in various methods such as screen printing, inkjet printing, and micro flow channels. A highly conductive, highly elastic, highly biocompatible circuit is obtained on the substrate material. The research is expected to be widely used in new areas such as wearable devices, implantable devices, and flexible robotics. The related research results were published online by the iScience magazine on June 14th under the title of Printable Metal-Polymer Conductors for Highly Stretchable Bio-Devices.